TY  - THES
AU  - Otović, Milena
UR  - https://eteze.bg.ac.rs/application/showtheses?thesesId=8908
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:27264/bdef:Content/download
UR  - https://plus.cobiss.net/cobiss/sr/sr/bib/62073097
UR  - https://nardus.mpn.gov.rs/handle/123456789/21097
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6004
AB  - Ваздушни хладњаци се у термотехници и процесној техници често примењују уусловима када су температуре амбијенталног ваздуха јако високе и знатно више одтемпература усвојених у прорачунима, па није могуће одвести прорачунску количинутоплоте. Потребна топлотна снага се у таквим случајевима може достићи ако се околниваздух орошава (влажи) распршивањем воде на улазу у апарат, јер се тиме снижаватемпература ваздуха, па се температурна разлика повећава, као и размењена количинатоплоте. Појава слоја влаге на размењивачу топлоте кључно мења топлотне и струјнеперформансе оваквих апарата.Детаљнија анализа расположиве литературе показала је да радови у којима сеистражује проблематика размене топлоте и супстанције на површини оребреногразмењивача топлоте са напрскавањем воде нису бројни, те се доводи у питањемогућност реалне примене података доступних у литератури за потребе инжењерскихпрорачуна при експлоатацији оваквих апарата, односно коју методологију прорачунакоефицијената прелаза топлоте и влаге препоручити као релевантну у одређенимусловима.У овој докторској дисертацији испитивани су различити режими рада ваздушниххладњака са оребреним цевима при њиховом напрскавању водом на улазу у апарат.Експериментална истраживања рада предметних размењивача топлоте су спроведена насамостално пројектованој инсталацији, која је направљена и монтирана у оквирутоплотне подстанице Машинског факултета у Београду. Развој физичког и прорачунскогмодела, заснованог на истовременом транспорту топлоте и супстанције, битан је заодређивање и прорачун релевантних параметара рада размењивача топлоте. Применомтеорије сличности, уз одговарајуће статистичке методе, одређене су меродавнекритеријумске зависности за израчунавање пада притиска, као и коефицијената прелазатоплоте и супстанције, тј. одређени су изрази погодни за инжењерску праксу.Ова докторска дисертација представља наставак истраживања проблемапроналажења поуздане прорачунске процедуре за одређивање коефицијената прелазатоплоте, супстанције и трења за широк опсег Рејнолдсових бројева и различитегеометријске карактеристике цевних размењивача топлоте са оребрењем који сеиспитују на Машинском факултету у Београду.
AB  - In HVAC&R and process engineering, air coolers are often used in the conditions whenambient air temperatures are very high and significantly higher than the temperatures acceptedin the calculations, and hence it is not possible to remove the calculated amount of heat. Inthese cases, the required heat can be reached if the surrounding air is humidified by sprayingwater at the entrance to the apparatus, because this lowers the air temperature, so thetemperature difference increases, as well as the amount of exchanged heat. The appearance ofa layer of moisture on the heat exchanger crucially changes the thermal performance and flowpattern of such apparatus.A more detailed analysis of the available literature shows that the papers whichinvestigate the problem of heat and substance exchange on the surface of the finned heatexchanger with water spraying are not numerous. Hence, the possibility of real application ofdata available in the literature is questionable when it comes to engineering calculations inexploitation of these apparatus, as well as to recommending relevant methodology forcalculating the coefficients of heat and mass transfer in certain conditions.This doctoral dissertation examines different operating regimes of air coolers with finnedtubes during their spraying with water at the entrance to the apparatus. Experimental researchon the operation of these heat exchangers was conducted on a self-designed installation, whichwas made and installed within the heating substation of the Faculty of Mechanical Engineeringin Belgrade. The deployment of a physical and computational model, based on thesimultaneous transport of heat and substance, is important for determining and calculating therelevant operating parameters of heat exchangers. Applying the theory of similarity, along withthe appropriate statistical methods, the relevant criteria equations for the calculation of pressuredrop were determined, as well as the coefficients of heat and mass transfer, i.e. certainequations suitable for engineering practice.This doctoral dissertation is a continuation of research on the problem of finding areliable calculation procedure for determining the coefficients of heat and mass transfer andthe coefficient of friction for a wide range of Reynolds numbers and different geometriccharacteristics of tubular heat exchangers with fins that are tested at the Faculty of MechanicalEngineering in Belgrade.
PB  - Универзитет у Београду, Машински факултет
T2  - Универзитет у Београду
T1  - Перформансе ваздушних хладњака са распршивањем воде
UR  - https://hdl.handle.net/21.15107/rcub_nardus_21097
ER  - 

@phdthesis{
author = "Otović, Milena",
abstract = "Ваздушни хладњаци се у термотехници и процесној техници често примењују уусловима када су температуре амбијенталног ваздуха јако високе и знатно више одтемпература усвојених у прорачунима, па није могуће одвести прорачунску количинутоплоте. Потребна топлотна снага се у таквим случајевима може достићи ако се околниваздух орошава (влажи) распршивањем воде на улазу у апарат, јер се тиме снижаватемпература ваздуха, па се температурна разлика повећава, као и размењена количинатоплоте. Појава слоја влаге на размењивачу топлоте кључно мења топлотне и струјнеперформансе оваквих апарата.Детаљнија анализа расположиве литературе показала је да радови у којима сеистражује проблематика размене топлоте и супстанције на површини оребреногразмењивача топлоте са напрскавањем воде нису бројни, те се доводи у питањемогућност реалне примене података доступних у литератури за потребе инжењерскихпрорачуна при експлоатацији оваквих апарата, односно коју методологију прорачунакоефицијената прелаза топлоте и влаге препоручити као релевантну у одређенимусловима.У овој докторској дисертацији испитивани су различити режими рада ваздушниххладњака са оребреним цевима при њиховом напрскавању водом на улазу у апарат.Експериментална истраживања рада предметних размењивача топлоте су спроведена насамостално пројектованој инсталацији, која је направљена и монтирана у оквирутоплотне подстанице Машинског факултета у Београду. Развој физичког и прорачунскогмодела, заснованог на истовременом транспорту топлоте и супстанције, битан је заодређивање и прорачун релевантних параметара рада размењивача топлоте. Применомтеорије сличности, уз одговарајуће статистичке методе, одређене су меродавнекритеријумске зависности за израчунавање пада притиска, као и коефицијената прелазатоплоте и супстанције, тј. одређени су изрази погодни за инжењерску праксу.Ова докторска дисертација представља наставак истраживања проблемапроналажења поуздане прорачунске процедуре за одређивање коефицијената прелазатоплоте, супстанције и трења за широк опсег Рејнолдсових бројева и различитегеометријске карактеристике цевних размењивача топлоте са оребрењем који сеиспитују на Машинском факултету у Београду., In HVAC&R and process engineering, air coolers are often used in the conditions whenambient air temperatures are very high and significantly higher than the temperatures acceptedin the calculations, and hence it is not possible to remove the calculated amount of heat. Inthese cases, the required heat can be reached if the surrounding air is humidified by sprayingwater at the entrance to the apparatus, because this lowers the air temperature, so thetemperature difference increases, as well as the amount of exchanged heat. The appearance ofa layer of moisture on the heat exchanger crucially changes the thermal performance and flowpattern of such apparatus.A more detailed analysis of the available literature shows that the papers whichinvestigate the problem of heat and substance exchange on the surface of the finned heatexchanger with water spraying are not numerous. Hence, the possibility of real application ofdata available in the literature is questionable when it comes to engineering calculations inexploitation of these apparatus, as well as to recommending relevant methodology forcalculating the coefficients of heat and mass transfer in certain conditions.This doctoral dissertation examines different operating regimes of air coolers with finnedtubes during their spraying with water at the entrance to the apparatus. Experimental researchon the operation of these heat exchangers was conducted on a self-designed installation, whichwas made and installed within the heating substation of the Faculty of Mechanical Engineeringin Belgrade. The deployment of a physical and computational model, based on thesimultaneous transport of heat and substance, is important for determining and calculating therelevant operating parameters of heat exchangers. Applying the theory of similarity, along withthe appropriate statistical methods, the relevant criteria equations for the calculation of pressuredrop were determined, as well as the coefficients of heat and mass transfer, i.e. certainequations suitable for engineering practice.This doctoral dissertation is a continuation of research on the problem of finding areliable calculation procedure for determining the coefficients of heat and mass transfer andthe coefficient of friction for a wide range of Reynolds numbers and different geometriccharacteristics of tubular heat exchangers with fins that are tested at the Faculty of MechanicalEngineering in Belgrade.",
publisher = "Универзитет у Београду, Машински факултет",
journal = "Универзитет у Београду",
title = "Перформансе ваздушних хладњака са распршивањем воде",
url = "https://hdl.handle.net/21.15107/rcub_nardus_21097"
}

Otović, M..Перформансе ваздушних хладњака са распршивањем воде. in Универзитет у Београду
Универзитет у Београду, Машински факултет..
https://hdl.handle.net/21.15107/rcub_nardus_21097

Otović M. Перформансе ваздушних хладњака са распршивањем воде. in Универзитет у Београду..
https://hdl.handle.net/21.15107/rcub_nardus_21097 .

Otović, Milena, "Перформансе ваздушних хладњака са распршивањем воде" in Универзитет у Београду,
https://hdl.handle.net/21.15107/rcub_nardus_21097 .

TY  - CONF
AU  - Černicin, Vladimir
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Zhang, Wenying
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6827
AB  - Theoretical cycle analysis is an indispensable part of the refrigeration system and heat pump (HP) design. However, due to the simplicity of the calculations and numerous assumptions, there is a deviation from the actual behavior of the system. In this paper, a single-stage, reversible CO2 system, which can operate in both air-conditioning and heating mode, with and without an internal heat exchanger (IHX), was presented. In the heating mode, the deviation of the theoretical cycle from the actual cycle of the heat pump was analyzed, under various operating conditions. Actual cycles were formed based on the experimental investigation of this system. The changes of various parameters and deviations that are made due to a simpler calculation are presented.
PB  - International Institute of Refrigeration
C3  - Proceedings of 10th Conference on Ammonia and CO2 Refrigeration Technology
T1  - THE DIFFERENCE BETWEEN SIMPLIFIED THEORETICAL AND EXPERIMENTAL CYCLE ANALYSIS OF CO2 HEAT PUMP
DO  - 10.18462/iir.nh3-co2.2023.0027
ER  - 

@conference{
author = "Černicin, Vladimir and Milovančević, Uroš and Otović, Milena and Zhang, Wenying",
year = "2023",
abstract = "Theoretical cycle analysis is an indispensable part of the refrigeration system and heat pump (HP) design. However, due to the simplicity of the calculations and numerous assumptions, there is a deviation from the actual behavior of the system. In this paper, a single-stage, reversible CO2 system, which can operate in both air-conditioning and heating mode, with and without an internal heat exchanger (IHX), was presented. In the heating mode, the deviation of the theoretical cycle from the actual cycle of the heat pump was analyzed, under various operating conditions. Actual cycles were formed based on the experimental investigation of this system. The changes of various parameters and deviations that are made due to a simpler calculation are presented.",
publisher = "International Institute of Refrigeration",
journal = "Proceedings of 10th Conference on Ammonia and CO2 Refrigeration Technology",
title = "THE DIFFERENCE BETWEEN SIMPLIFIED THEORETICAL AND EXPERIMENTAL CYCLE ANALYSIS OF CO2 HEAT PUMP",
doi = "10.18462/iir.nh3-co2.2023.0027"
}

Černicin, V., Milovančević, U., Otović, M.,& Zhang, W.. (2023). THE DIFFERENCE BETWEEN SIMPLIFIED THEORETICAL AND EXPERIMENTAL CYCLE ANALYSIS OF CO2 HEAT PUMP. in Proceedings of 10th Conference on Ammonia and CO2 Refrigeration Technology
International Institute of Refrigeration..
https://doi.org/10.18462/iir.nh3-co2.2023.0027

Černicin V, Milovančević U, Otović M, Zhang W. THE DIFFERENCE BETWEEN SIMPLIFIED THEORETICAL AND EXPERIMENTAL CYCLE ANALYSIS OF CO2 HEAT PUMP. in Proceedings of 10th Conference on Ammonia and CO2 Refrigeration Technology. 2023;.
doi:10.18462/iir.nh3-co2.2023.0027 .

Černicin, Vladimir, Milovančević, Uroš, Otović, Milena, Zhang, Wenying, "THE DIFFERENCE BETWEEN SIMPLIFIED THEORETICAL AND EXPERIMENTAL CYCLE ANALYSIS OF CO2 HEAT PUMP" in Proceedings of 10th Conference on Ammonia and CO2 Refrigeration Technology (2023),
https://doi.org/10.18462/iir.nh3-co2.2023.0027 . .

TY  - CONF
AU  - Mandić, Aleksa
AU  - Milovančević, Uroš
AU  - Beljanski, Vladimir
AU  - Otović, Milena
AU  - Černicin, Vladimir
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5732
AB  - This paper analyzes the operational characteristics of the Tuzla brewery refrigeration system after the installation of the Danfoss IPS8 air purging device. In order for an analysis such as this to be conducted correctly, one must understand where in the brewing industry the need for refrigeration occurs, how non-condensable gases are accumulated inside of the refrigeration system, and how the separation of non-condensable gases is done. After the theoretical part of the analysis, in which the thermodynamic basics of the ammonia refrigeration cycle is explained, an analysis of annual savings was conducted. The results of the analysis are presented in the form of annual savings in electricity consumption, for different operating conditions of the specific refrigeration system with and without a purger. At the end of this analysis, the amount of released non-condensable gases were also calculated.
PB  - Beograd: SMEITS
C3  - Zbornik 53. Međunarodnog kongresa o KGH
T1  - EFFECTS OF PURGING NON-CONDENSABLE GASES FROM AMMONIA REFRIGERATION SYSTEM
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5732
ER  - 

@conference{
author = "Mandić, Aleksa and Milovančević, Uroš and Beljanski, Vladimir and Otović, Milena and Černicin, Vladimir",
year = "2023",
abstract = "This paper analyzes the operational characteristics of the Tuzla brewery refrigeration system after the installation of the Danfoss IPS8 air purging device. In order for an analysis such as this to be conducted correctly, one must understand where in the brewing industry the need for refrigeration occurs, how non-condensable gases are accumulated inside of the refrigeration system, and how the separation of non-condensable gases is done. After the theoretical part of the analysis, in which the thermodynamic basics of the ammonia refrigeration cycle is explained, an analysis of annual savings was conducted. The results of the analysis are presented in the form of annual savings in electricity consumption, for different operating conditions of the specific refrigeration system with and without a purger. At the end of this analysis, the amount of released non-condensable gases were also calculated.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 53. Međunarodnog kongresa o KGH",
title = "EFFECTS OF PURGING NON-CONDENSABLE GASES FROM AMMONIA REFRIGERATION SYSTEM",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5732"
}

Mandić, A., Milovančević, U., Beljanski, V., Otović, M.,& Černicin, V.. (2023). EFFECTS OF PURGING NON-CONDENSABLE GASES FROM AMMONIA REFRIGERATION SYSTEM. in Zbornik 53. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5732

Mandić A, Milovančević U, Beljanski V, Otović M, Černicin V. EFFECTS OF PURGING NON-CONDENSABLE GASES FROM AMMONIA REFRIGERATION SYSTEM. in Zbornik 53. Međunarodnog kongresa o KGH. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_5732 .

Mandić, Aleksa, Milovančević, Uroš, Beljanski, Vladimir, Otović, Milena, Černicin, Vladimir, "EFFECTS OF PURGING NON-CONDENSABLE GASES FROM AMMONIA REFRIGERATION SYSTEM" in Zbornik 53. Međunarodnog kongresa o KGH (2023),
https://hdl.handle.net/21.15107/rcub_machinery_5732 .

TY  - GEN
AU  - Jaćimović, Branislav M.
AU  - Genić, Srbislav
AU  - Stamenić, Mirjana
AU  - Aranđelović, Ivan
AU  - Petrović, Aleksandar
AU  - Mitrović, Nenad
AU  - Milovančević, Uroš
AU  - Ivošević, Miloš
AU  - Otović, Milena
AU  - Petrović, Andrija
AU  - Rajić, Radenko S.
AU  - Tanasić, Nikola
AU  - Mihailović, Miloš
AU  - Marković, Saša
AU  - Bogdanović, Predrag
AU  - Simonović, Tomislav
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6065
PB  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6065
ER  - 

@misc{
author = "Jaćimović, Branislav M. and Genić, Srbislav and Stamenić, Mirjana and Aranđelović, Ivan and Petrović, Aleksandar and Mitrović, Nenad and Milovančević, Uroš and Ivošević, Miloš and Otović, Milena and Petrović, Andrija and Rajić, Radenko S. and Tanasić, Nikola and Mihailović, Miloš and Marković, Saša and Bogdanović, Predrag and Simonović, Tomislav",
year = "2022",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6065"
}

Jaćimović, B. M., Genić, S., Stamenić, M., Aranđelović, I., Petrović, A., Mitrović, N., Milovančević, U., Ivošević, M., Otović, M., Petrović, A., Rajić, R. S., Tanasić, N., Mihailović, M., Marković, S., Bogdanović, P.,& Simonović, T.. (2022). Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici. 
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_6065

Jaćimović BM, Genić S, Stamenić M, Aranđelović I, Petrović A, Mitrović N, Milovančević U, Ivošević M, Otović M, Petrović A, Rajić RS, Tanasić N, Mihailović M, Marković S, Bogdanović P, Simonović T. Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6065 .

Jaćimović, Branislav M., Genić, Srbislav, Stamenić, Mirjana, Aranđelović, Ivan, Petrović, Aleksandar, Mitrović, Nenad, Milovančević, Uroš, Ivošević, Miloš, Otović, Milena, Petrović, Andrija, Rajić, Radenko S., Tanasić, Nikola, Mihailović, Miloš, Marković, Saša, Bogdanović, Predrag, Simonović, Tomislav, "Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici" (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6065 .

TY  - JOUR
AU  - Ivanović, Milica
AU  - Černicin, Vladimir
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Stevanović, Snežana M.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5730
AB  - The paper analyzed three generations of R744 systems: the basic booster system, the booster system with parallel compression, and the multi ejector system. The aim was to compare these systems from the point of view of efficiency and electricity consumption. The analysis is based on the model with two temperature levels of evaporators –30 °C and –10 °C, and with a total cooling capacity of 250 kW and 150 kW, respectively. The analysis was carried out for the climatic conditions of the city of Belgrade in the summer period when the greatest differences in operation are expected. The results showed that the next system generations achieve savings in electricity consumption for the considered period.
PB  - Beograd: SMEITS
T2  - KGH. Klimatizacija, grejanje, hlađenje
T1  - COMPARATIVE ANALYSIS OF THREE GENERATIONS OF TRANSCRITICAL CO2 SYSTEMS
IS  - 4
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5730
ER  - 

@article{
author = "Ivanović, Milica and Černicin, Vladimir and Milovančević, Uroš and Otović, Milena and Stevanović, Snežana M.",
year = "2022",
abstract = "The paper analyzed three generations of R744 systems: the basic booster system, the booster system with parallel compression, and the multi ejector system. The aim was to compare these systems from the point of view of efficiency and electricity consumption. The analysis is based on the model with two temperature levels of evaporators –30 °C and –10 °C, and with a total cooling capacity of 250 kW and 150 kW, respectively. The analysis was carried out for the climatic conditions of the city of Belgrade in the summer period when the greatest differences in operation are expected. The results showed that the next system generations achieve savings in electricity consumption for the considered period.",
publisher = "Beograd: SMEITS",
journal = "KGH. Klimatizacija, grejanje, hlađenje",
title = "COMPARATIVE ANALYSIS OF THREE GENERATIONS OF TRANSCRITICAL CO2 SYSTEMS",
number = "4",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5730"
}

Ivanović, M., Černicin, V., Milovančević, U., Otović, M.,& Stevanović, S. M.. (2022). COMPARATIVE ANALYSIS OF THREE GENERATIONS OF TRANSCRITICAL CO2 SYSTEMS. in KGH. Klimatizacija, grejanje, hlađenje
Beograd: SMEITS., 51(4).
https://hdl.handle.net/21.15107/rcub_machinery_5730

Ivanović M, Černicin V, Milovančević U, Otović M, Stevanović SM. COMPARATIVE ANALYSIS OF THREE GENERATIONS OF TRANSCRITICAL CO2 SYSTEMS. in KGH. Klimatizacija, grejanje, hlađenje. 2022;51(4).
https://hdl.handle.net/21.15107/rcub_machinery_5730 .

Ivanović, Milica, Černicin, Vladimir, Milovančević, Uroš, Otović, Milena, Stevanović, Snežana M., "COMPARATIVE ANALYSIS OF THREE GENERATIONS OF TRANSCRITICAL CO2 SYSTEMS" in KGH. Klimatizacija, grejanje, hlađenje, 51, no. 4 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5730 .

TY  - CONF
AU  - Černicin, Vladimir
AU  - Milovančević, Uroš
AU  - Gojak, Milan
AU  - Otović, Milena
AU  - Sretenović, Aleksandra
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5014
AB  - The use of carbon dioxide (CO2) refrigeration systems is increasingly present in modern supermarkets. Compared to conventional systems with freons, these systems use a natural and environmentally friendly refrigerant, but their energy efficiency is lower. However, with the advent of new technologies and better understanding of carbon dioxide, space has been created for system improvement and the introduction of new technical solutions. Also, one of the useful methods for improving the operation of the transcritical CO2 system is the determination of the optimum high side pressure in the gas cooler.
In this paper, two transcritical CO2 systems (1st generation) are presented, which represent a potential technical solution for the system that will be carried out in the Laboratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. In order to maintain the maximum coefficient of performance (COP) with optimum high side pressure, a thermodynamic analysis was carried out for one selected system. In addition to the influence of the ambient air temperature, the possible affecting parameters on  COP and optimum high side pressure was also considered. Finally, a proper control equation is given.
PB  - Beograd: SMEITS
C3  - Zbornik 53. Međunarodnog kongresa o KGH, 2022
T1  - THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5014
ER  - 

@conference{
author = "Černicin, Vladimir and Milovančević, Uroš and Gojak, Milan and Otović, Milena and Sretenović, Aleksandra",
year = "2022",
abstract = "The use of carbon dioxide (CO2) refrigeration systems is increasingly present in modern supermarkets. Compared to conventional systems with freons, these systems use a natural and environmentally friendly refrigerant, but their energy efficiency is lower. However, with the advent of new technologies and better understanding of carbon dioxide, space has been created for system improvement and the introduction of new technical solutions. Also, one of the useful methods for improving the operation of the transcritical CO2 system is the determination of the optimum high side pressure in the gas cooler.
In this paper, two transcritical CO2 systems (1st generation) are presented, which represent a potential technical solution for the system that will be carried out in the Laboratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. In order to maintain the maximum coefficient of performance (COP) with optimum high side pressure, a thermodynamic analysis was carried out for one selected system. In addition to the influence of the ambient air temperature, the possible affecting parameters on  COP and optimum high side pressure was also considered. Finally, a proper control equation is given.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 53. Međunarodnog kongresa o KGH, 2022",
title = "THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5014"
}

Černicin, V., Milovančević, U., Gojak, M., Otović, M.,& Sretenović, A.. (2022). THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET. in Zbornik 53. Međunarodnog kongresa o KGH, 2022
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5014

Černicin V, Milovančević U, Gojak M, Otović M, Sretenović A. THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET. in Zbornik 53. Međunarodnog kongresa o KGH, 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5014 .

Černicin, Vladimir, Milovančević, Uroš, Gojak, Milan, Otović, Milena, Sretenović, Aleksandra, "THEORETICAL DETERMINATION OF THE OPTIMUM PRESSURE OF THE TRANSCRITICAL CO2 SYSTEMS IN SUPERMARKET" in Zbornik 53. Međunarodnog kongresa o KGH, 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5014 .

TY  - CONF
AU  - Gajić, Branislav
AU  - Milovančević, Uroš
AU  - Ivošević, Miloš
AU  - Otović, Milena
AU  - Marković, Saša
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6155
AB  - Prirubnice od ugljeničnog čelika predstavljaju sastavni deo cevovoda i opreme u različitim granama industrije. Njihova klasifikacija je u standardima izvršena prema nominalnom pritisku (PN). Radi određivanja PN za prirubnice od ugljeničnog čelika potrebno je poznavati materijal prirubnice, kao i radne uslove: pritisak i temperaturu. Za potrebe inženjerske prakse, u radu su date korelacije između pritiska, temperature i nominalnog pritiska, koje su dobijene obradom podataka, datih u standardu SRPS EN 1092 – Prirubnice i njihovi spojevi – kružne prirubnice za cevi, armature fazonske komade i pribor, koje nose oznaku PN. Ocena kvaliteta korelacija izvršena je pomoću statističkih pokazatelja: korelacionog odnosa i srednjeg kvadratnog odstupanja.
PB  - Beograd: SMEITS
C3  - Zbornik 34. Kongresa Procesing
T1  - Koralacije za određivanje nominalnog pritiska u funkciji od temperature i pritiska za prirubnice od ugljeničnog čelika
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6155
ER  - 

@conference{
author = "Gajić, Branislav and Milovančević, Uroš and Ivošević, Miloš and Otović, Milena and Marković, Saša",
year = "2021",
abstract = "Prirubnice od ugljeničnog čelika predstavljaju sastavni deo cevovoda i opreme u različitim granama industrije. Njihova klasifikacija je u standardima izvršena prema nominalnom pritisku (PN). Radi određivanja PN za prirubnice od ugljeničnog čelika potrebno je poznavati materijal prirubnice, kao i radne uslove: pritisak i temperaturu. Za potrebe inženjerske prakse, u radu su date korelacije između pritiska, temperature i nominalnog pritiska, koje su dobijene obradom podataka, datih u standardu SRPS EN 1092 – Prirubnice i njihovi spojevi – kružne prirubnice za cevi, armature fazonske komade i pribor, koje nose oznaku PN. Ocena kvaliteta korelacija izvršena je pomoću statističkih pokazatelja: korelacionog odnosa i srednjeg kvadratnog odstupanja.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 34. Kongresa Procesing",
title = "Koralacije za određivanje nominalnog pritiska u funkciji od temperature i pritiska za prirubnice od ugljeničnog čelika",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6155"
}

Gajić, B., Milovančević, U., Ivošević, M., Otović, M.,& Marković, S.. (2021). Koralacije za određivanje nominalnog pritiska u funkciji od temperature i pritiska za prirubnice od ugljeničnog čelika. in Zbornik 34. Kongresa Procesing
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_6155

Gajić B, Milovančević U, Ivošević M, Otović M, Marković S. Koralacije za određivanje nominalnog pritiska u funkciji od temperature i pritiska za prirubnice od ugljeničnog čelika. in Zbornik 34. Kongresa Procesing. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_6155 .

Gajić, Branislav, Milovančević, Uroš, Ivošević, Miloš, Otović, Milena, Marković, Saša, "Koralacije za određivanje nominalnog pritiska u funkciji od temperature i pritiska za prirubnice od ugljeničnog čelika" in Zbornik 34. Kongresa Procesing (2021),
https://hdl.handle.net/21.15107/rcub_machinery_6155 .

TY  - JOUR
AU  - Stevanović, Snežana M.
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Marković, Dragan
AU  - Leposavić, Aleksandar
AU  - Urošević, Tijana
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5708
AB  - Freezing is the method usually used for preserving delicate fruit, because the product tends to maintain its original attributes, i.e., keeping its nutritional properties as close as possible to those of fresh fruit. Strawberry is a widespread and highly demanded fruit, but the fresh fruits are available in a short period of time and the largest amount of strawberry is processed by freezing. The aim of the paper is to determine the effect of process of freezing in the industrial conditions, with precooling, on the relevant parameters of the strawberry quality.  The fruits were frozen in the conventional freezing tunnel by cold air temperature of –33 °C until reaching a temperature of –15 °C in the thermal center of the fruits. Packaged frozen fruits were stored in the chamber  at –18 °C. In order to determine the changes in strawberry quality, the content of dry matter, total sugars and acids, pH, vitamin C, and sensory quality characteristics were analyzed. Also, quality index of the fresh and frozen strawberry is determined by calculation. The obtained results showed that there were no significant changes in the physicochemical parameters of quality after the freezing of the strawberry fruits. Significant  changes are found in the sensory characteristics and the most remarkable is the loss of consistency and firmness of the frozen strawberry. Also, some modified color, taste and aroma of the strawberry fruit have been noticed after freezing in the industrial conditions.
PB  - Beograd: SMEITS
T2  - KGH. Klimatizacija, grejanje, hlađenje
T1  - Effect of freezing in the industrial conditions  on quality of strawberry fruits
IS  - 3
VL  - 50
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5708
ER  - 

@article{
author = "Stevanović, Snežana M. and Milovančević, Uroš and Otović, Milena and Marković, Dragan and Leposavić, Aleksandar and Urošević, Tijana",
year = "2021",
abstract = "Freezing is the method usually used for preserving delicate fruit, because the product tends to maintain its original attributes, i.e., keeping its nutritional properties as close as possible to those of fresh fruit. Strawberry is a widespread and highly demanded fruit, but the fresh fruits are available in a short period of time and the largest amount of strawberry is processed by freezing. The aim of the paper is to determine the effect of process of freezing in the industrial conditions, with precooling, on the relevant parameters of the strawberry quality.  The fruits were frozen in the conventional freezing tunnel by cold air temperature of –33 °C until reaching a temperature of –15 °C in the thermal center of the fruits. Packaged frozen fruits were stored in the chamber  at –18 °C. In order to determine the changes in strawberry quality, the content of dry matter, total sugars and acids, pH, vitamin C, and sensory quality characteristics were analyzed. Also, quality index of the fresh and frozen strawberry is determined by calculation. The obtained results showed that there were no significant changes in the physicochemical parameters of quality after the freezing of the strawberry fruits. Significant  changes are found in the sensory characteristics and the most remarkable is the loss of consistency and firmness of the frozen strawberry. Also, some modified color, taste and aroma of the strawberry fruit have been noticed after freezing in the industrial conditions.",
publisher = "Beograd: SMEITS",
journal = "KGH. Klimatizacija, grejanje, hlađenje",
title = "Effect of freezing in the industrial conditions  on quality of strawberry fruits",
number = "3",
volume = "50",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5708"
}

Stevanović, S. M., Milovančević, U., Otović, M., Marković, D., Leposavić, A.,& Urošević, T.. (2021). Effect of freezing in the industrial conditions  on quality of strawberry fruits. in KGH. Klimatizacija, grejanje, hlađenje
Beograd: SMEITS., 50(3).
https://hdl.handle.net/21.15107/rcub_machinery_5708

Stevanović SM, Milovančević U, Otović M, Marković D, Leposavić A, Urošević T. Effect of freezing in the industrial conditions  on quality of strawberry fruits. in KGH. Klimatizacija, grejanje, hlađenje. 2021;50(3).
https://hdl.handle.net/21.15107/rcub_machinery_5708 .

Stevanović, Snežana M., Milovančević, Uroš, Otović, Milena, Marković, Dragan, Leposavić, Aleksandar, Urošević, Tijana, "Effect of freezing in the industrial conditions  on quality of strawberry fruits" in KGH. Klimatizacija, grejanje, hlađenje, 50, no. 3 (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5708 .

TY  - CONF
AU  - Cvetković, Marijana
AU  - Milovančević, Uroš
AU  - Otović, Milena
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5533
AB  - The paper analyzes the influence of different parameters on the effective Coefficient of Performance (COP) of a ground source heat pump. Heat pump located in the Laboratory for Thermal Science Engineering at the Faculty of Mechanical Engineering in Belgrade is adopted for model.  Since the change in soil temperature more or less depends on the change in air temperature,  the average monthly air temperatures for the considered heating seasons 2014 ÷ 2018 were used in  the calculation. The model enables the analysis of various parameters on performance of heat pump,  such  as  the  change  of the  soil  temperature,  as well  as the  change  of  the return  water  temperature  from the heating system.
PB  - Beograd: SMEITS
C3  - Zbornik 52. Međunarodnog kongresa o KGH
T1  - GROUND SOURCE HEAT PUMP OPERATION ANALYSIS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5533
ER  - 

@conference{
author = "Cvetković, Marijana and Milovančević, Uroš and Otović, Milena",
year = "2021",
abstract = "The paper analyzes the influence of different parameters on the effective Coefficient of Performance (COP) of a ground source heat pump. Heat pump located in the Laboratory for Thermal Science Engineering at the Faculty of Mechanical Engineering in Belgrade is adopted for model.  Since the change in soil temperature more or less depends on the change in air temperature,  the average monthly air temperatures for the considered heating seasons 2014 ÷ 2018 were used in  the calculation. The model enables the analysis of various parameters on performance of heat pump,  such  as  the  change  of the  soil  temperature,  as well  as the  change  of  the return  water  temperature  from the heating system.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 52. Međunarodnog kongresa o KGH",
title = "GROUND SOURCE HEAT PUMP OPERATION ANALYSIS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5533"
}

Cvetković, M., Milovančević, U.,& Otović, M.. (2021). GROUND SOURCE HEAT PUMP OPERATION ANALYSIS. in Zbornik 52. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5533

Cvetković M, Milovančević U, Otović M. GROUND SOURCE HEAT PUMP OPERATION ANALYSIS. in Zbornik 52. Međunarodnog kongresa o KGH. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_5533 .

Cvetković, Marijana, Milovančević, Uroš, Otović, Milena, "GROUND SOURCE HEAT PUMP OPERATION ANALYSIS" in Zbornik 52. Međunarodnog kongresa o KGH (2021),
https://hdl.handle.net/21.15107/rcub_machinery_5533 .

TY  - JOUR
AU  - Mihailović, Miloš
AU  - Milovančević, Uroš
AU  - Genić, Srbislav
AU  - Jaćimović, Branislav M.
AU  - Otović, Milena
AU  - Kolendić, Petar
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3274
AB  - In order to establish a reliable procedure for estimation of heat transfer coefficient, experiments on plate finned tube heat exchangers have been conducted on five exchangers. Using own and previously published experimental data databank of 969 working regimes, a new correlation was formed. Correlation is based on hydraulic diameter and porous velocity and on the ratio of characteristic surfaces of the finned tube bundle. Statistical parameters of a new correlation for estimation of heat transfer coefficient are very good, and correlation covers a wide range of geometrical and other parameters of heat exchangers that are industrially important.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Experimental Heat Transfer
T1  - Air side heat transfer coefficient in plate finned tube heat exchangers
EP  - 399
IS  - 4
SP  - 388
VL  - 33
DO  - 10.1080/08916152.2019.1656298
ER  - 

@article{
author = "Mihailović, Miloš and Milovančević, Uroš and Genić, Srbislav and Jaćimović, Branislav M. and Otović, Milena and Kolendić, Petar",
year = "2020",
abstract = "In order to establish a reliable procedure for estimation of heat transfer coefficient, experiments on plate finned tube heat exchangers have been conducted on five exchangers. Using own and previously published experimental data databank of 969 working regimes, a new correlation was formed. Correlation is based on hydraulic diameter and porous velocity and on the ratio of characteristic surfaces of the finned tube bundle. Statistical parameters of a new correlation for estimation of heat transfer coefficient are very good, and correlation covers a wide range of geometrical and other parameters of heat exchangers that are industrially important.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Experimental Heat Transfer",
title = "Air side heat transfer coefficient in plate finned tube heat exchangers",
pages = "399-388",
number = "4",
volume = "33",
doi = "10.1080/08916152.2019.1656298"
}

Mihailović, M., Milovančević, U., Genić, S., Jaćimović, B. M., Otović, M.,& Kolendić, P.. (2020). Air side heat transfer coefficient in plate finned tube heat exchangers. in Experimental Heat Transfer
Taylor & Francis Inc, Philadelphia., 33(4), 388-399.
https://doi.org/10.1080/08916152.2019.1656298

Mihailović M, Milovančević U, Genić S, Jaćimović BM, Otović M, Kolendić P. Air side heat transfer coefficient in plate finned tube heat exchangers. in Experimental Heat Transfer. 2020;33(4):388-399.
doi:10.1080/08916152.2019.1656298 .

Mihailović, Miloš, Milovančević, Uroš, Genić, Srbislav, Jaćimović, Branislav M., Otović, Milena, Kolendić, Petar, "Air side heat transfer coefficient in plate finned tube heat exchangers" in Experimental Heat Transfer, 33, no. 4 (2020):388-399,
https://doi.org/10.1080/08916152.2019.1656298 . .

TY  - CONF
AU  - Otović, Milena
AU  - Milovančević, Uroš
AU  - Genić, Srbislav
AU  - Mitrović, Nenad
AU  - Černicin, Vladimir
AU  - Otović, Srđan
AU  - Antić, Milan I.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5535
AB  - On the hitherto installed chillers/rooftop units/dry coolers and air coolers, a significant improvement in cooling was noticed in the summer mode when the pipe bundle is sprayed with water. Tests have been performed on systems that produce water mist (micron-sized water droplets), which are formed by spraying water under high pressure through the nozzles/nozzle openings. When a drop of micron-sized water comes in contact with warm air, it evaporates very quickly, absorbing a certain amount of heat, which results in cooling the air. This improves the operation of the cooler in critical periods when the ambient air temperature is very high. The aim of the test is to determine the improvement of the cooler operation under operating conditions with the application of the described system in relation to the operating mode without water spraying (dry operating mode).
PB  - Beograd: SMEITS
C3  - Zbornik 51. Međunarodnog kongresa o KGH
T1  - TESTING OF THE INFLUENCE OF THE SPRAY COOLING SYSTEM ON THE AIR COOLER EFFICIENCY
DO  - 10.24094/kghk.020.51.1.11
ER  - 

@conference{
author = "Otović, Milena and Milovančević, Uroš and Genić, Srbislav and Mitrović, Nenad and Černicin, Vladimir and Otović, Srđan and Antić, Milan I.",
year = "2020",
abstract = "On the hitherto installed chillers/rooftop units/dry coolers and air coolers, a significant improvement in cooling was noticed in the summer mode when the pipe bundle is sprayed with water. Tests have been performed on systems that produce water mist (micron-sized water droplets), which are formed by spraying water under high pressure through the nozzles/nozzle openings. When a drop of micron-sized water comes in contact with warm air, it evaporates very quickly, absorbing a certain amount of heat, which results in cooling the air. This improves the operation of the cooler in critical periods when the ambient air temperature is very high. The aim of the test is to determine the improvement of the cooler operation under operating conditions with the application of the described system in relation to the operating mode without water spraying (dry operating mode).",
publisher = "Beograd: SMEITS",
journal = "Zbornik 51. Međunarodnog kongresa o KGH",
title = "TESTING OF THE INFLUENCE OF THE SPRAY COOLING SYSTEM ON THE AIR COOLER EFFICIENCY",
doi = "10.24094/kghk.020.51.1.11"
}

Otović, M., Milovančević, U., Genić, S., Mitrović, N., Černicin, V., Otović, S.,& Antić, M. I.. (2020). TESTING OF THE INFLUENCE OF THE SPRAY COOLING SYSTEM ON THE AIR COOLER EFFICIENCY. in Zbornik 51. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://doi.org/10.24094/kghk.020.51.1.11

Otović M, Milovančević U, Genić S, Mitrović N, Černicin V, Otović S, Antić MI. TESTING OF THE INFLUENCE OF THE SPRAY COOLING SYSTEM ON THE AIR COOLER EFFICIENCY. in Zbornik 51. Međunarodnog kongresa o KGH. 2020;.
doi:10.24094/kghk.020.51.1.11 .

Otović, Milena, Milovančević, Uroš, Genić, Srbislav, Mitrović, Nenad, Černicin, Vladimir, Otović, Srđan, Antić, Milan I., "TESTING OF THE INFLUENCE OF THE SPRAY COOLING SYSTEM ON THE AIR COOLER EFFICIENCY" in Zbornik 51. Međunarodnog kongresa o KGH (2020),
https://doi.org/10.24094/kghk.020.51.1.11 . .

TY  - CONF
AU  - Otović, Milena
AU  - Genić, Srbislav
AU  - Milovančević, Uroš
AU  - Černicin, Vladimir
AU  - Otović, Srđan
AU  - Stevanović, Snežana M.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5517
AB  - This paper deals with the procedure for measuring the relevant parameters of plate-finned tube heat exchangers operating as an air heaters. Besides the description of the experimental installation, the most important geometric characteristics of these appliances are given. In order to determine the relevant parameters for dry and wet regimes (for cases with and without spray cooling), experimental measurements of the heat and hydraulic performance of the heat exchangers were made. Water flowed through the pipes as a warmer fluid. During the experiments, the flow rates and temperatures of the working fluids were varied within the limits defined by the operating parameters of the installation itself, sufficient to allow the obtained results to be generalized. The experimental data were processed by appropriate statistical methods; the aim was to determine equations suitable for engineering practice. The coefficients of the air-side heat and mass transfer and friction factor are defined on the complex geometry of this type of heat exchangers under realistic operating conditions, as a function of the relevant similarity criteria.
PB  - Beograd: SMEITS
C3  - Zbornik 50. Međunarodnog kongresa o KGH
T1  - TESTING OF AIR HEATERS WITH PLATE FINNED TUBES WITH SPRAY COOLING
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5517
ER  - 

@conference{
author = "Otović, Milena and Genić, Srbislav and Milovančević, Uroš and Černicin, Vladimir and Otović, Srđan and Stevanović, Snežana M.",
year = "2020",
abstract = "This paper deals with the procedure for measuring the relevant parameters of plate-finned tube heat exchangers operating as an air heaters. Besides the description of the experimental installation, the most important geometric characteristics of these appliances are given. In order to determine the relevant parameters for dry and wet regimes (for cases with and without spray cooling), experimental measurements of the heat and hydraulic performance of the heat exchangers were made. Water flowed through the pipes as a warmer fluid. During the experiments, the flow rates and temperatures of the working fluids were varied within the limits defined by the operating parameters of the installation itself, sufficient to allow the obtained results to be generalized. The experimental data were processed by appropriate statistical methods; the aim was to determine equations suitable for engineering practice. The coefficients of the air-side heat and mass transfer and friction factor are defined on the complex geometry of this type of heat exchangers under realistic operating conditions, as a function of the relevant similarity criteria.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 50. Međunarodnog kongresa o KGH",
title = "TESTING OF AIR HEATERS WITH PLATE FINNED TUBES WITH SPRAY COOLING",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5517"
}

Otović, M., Genić, S., Milovančević, U., Černicin, V., Otović, S.,& Stevanović, S. M.. (2020). TESTING OF AIR HEATERS WITH PLATE FINNED TUBES WITH SPRAY COOLING. in Zbornik 50. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5517

Otović M, Genić S, Milovančević U, Černicin V, Otović S, Stevanović SM. TESTING OF AIR HEATERS WITH PLATE FINNED TUBES WITH SPRAY COOLING. in Zbornik 50. Međunarodnog kongresa o KGH. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_5517 .

Otović, Milena, Genić, Srbislav, Milovančević, Uroš, Černicin, Vladimir, Otović, Srđan, Stevanović, Snežana M., "TESTING OF AIR HEATERS WITH PLATE FINNED TUBES WITH SPRAY COOLING" in Zbornik 50. Međunarodnog kongresa o KGH (2020),
https://hdl.handle.net/21.15107/rcub_machinery_5517 .

TY  - CONF
AU  - Malić, Ljubomir
AU  - Paunović, Aleksandra
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Černicin, Vladimir
AU  - Sretenović, Aleksandra
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5077
AB  - The aim of this paper is a theoretical analysis of the operation of an air-to-water heat pump located in the Labo-ratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. This results provide the basis for further experimental analyzes of this installation.
The paper gives a comparative overview of the performance of a scroll and reciprocating compressor when pro-pane (R290) is used as a refrigerant. Also, the analysis of the influence of internal subcooling on the thermodynamic cycle is presented. Finally, according to the developed model of the heat pump performances investigation, the change in the average values of Coefficient of Performance (COP) during the average heating season, for the period 2014 – 2018, is shown.
AB  - Cilj ovog rada je sveobuhvatna teorijska analiza toplotne pumpe vazduh–voda koja se nalazi u Laboratoriji za termotehniku Mašinskog fakulteta u Beogradu. Ostvareni rezultati predstavljaju odličnu osnovu za eksperimentalna ispitivanja ove instalacije.
U radu je dat uporedni pregled performansi spiralnog (skrol) i klipnog kompresora kada se kao rashladni fluid u instalaciji toplotne pumpe koristi propan (R290). Takođe, urađene su analize uticaja unutrašnjeg prehlađivanja na termodinamički ciklus i analiza performansi toplotne pumpe na osnovu napravljenog modela. Na kraju, prikazana je promena vrednosti efektivnog koeficijenta grejanja (COP) za prosečnu grejnu sezonu, u periodu od 2014. do 2018. godine, na osnovu podataka Republičkog hidrometeorološkog zavoda Srbije.
PB  - Beograd : SMEITS
C3  - Zbornik radova 51 Međunarodni kongres o grejanju, hlađenju i klimatizaciji
T1  - Analiza rada toplotne pumpe vazduh-voda
VL  - 51
DO  - 10.24094/kghk.020.51.1.31
ER  - 

@conference{
author = "Malić, Ljubomir and Paunović, Aleksandra and Milovančević, Uroš and Otović, Milena and Černicin, Vladimir and Sretenović, Aleksandra",
year = "2020",
abstract = "The aim of this paper is a theoretical analysis of the operation of an air-to-water heat pump located in the Labo-ratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. This results provide the basis for further experimental analyzes of this installation.
The paper gives a comparative overview of the performance of a scroll and reciprocating compressor when pro-pane (R290) is used as a refrigerant. Also, the analysis of the influence of internal subcooling on the thermodynamic cycle is presented. Finally, according to the developed model of the heat pump performances investigation, the change in the average values of Coefficient of Performance (COP) during the average heating season, for the period 2014 – 2018, is shown., Cilj ovog rada je sveobuhvatna teorijska analiza toplotne pumpe vazduh–voda koja se nalazi u Laboratoriji za termotehniku Mašinskog fakulteta u Beogradu. Ostvareni rezultati predstavljaju odličnu osnovu za eksperimentalna ispitivanja ove instalacije.
U radu je dat uporedni pregled performansi spiralnog (skrol) i klipnog kompresora kada se kao rashladni fluid u instalaciji toplotne pumpe koristi propan (R290). Takođe, urađene su analize uticaja unutrašnjeg prehlađivanja na termodinamički ciklus i analiza performansi toplotne pumpe na osnovu napravljenog modela. Na kraju, prikazana je promena vrednosti efektivnog koeficijenta grejanja (COP) za prosečnu grejnu sezonu, u periodu od 2014. do 2018. godine, na osnovu podataka Republičkog hidrometeorološkog zavoda Srbije.",
publisher = "Beograd : SMEITS",
journal = "Zbornik radova 51 Međunarodni kongres o grejanju, hlađenju i klimatizaciji",
title = "Analiza rada toplotne pumpe vazduh-voda",
volume = "51",
doi = "10.24094/kghk.020.51.1.31"
}

Malić, L., Paunović, A., Milovančević, U., Otović, M., Černicin, V.,& Sretenović, A.. (2020). Analiza rada toplotne pumpe vazduh-voda. in Zbornik radova 51 Međunarodni kongres o grejanju, hlađenju i klimatizaciji
Beograd : SMEITS., 51.
https://doi.org/10.24094/kghk.020.51.1.31

Malić L, Paunović A, Milovančević U, Otović M, Černicin V, Sretenović A. Analiza rada toplotne pumpe vazduh-voda. in Zbornik radova 51 Međunarodni kongres o grejanju, hlađenju i klimatizaciji. 2020;51.
doi:10.24094/kghk.020.51.1.31 .

Malić, Ljubomir, Paunović, Aleksandra, Milovančević, Uroš, Otović, Milena, Černicin, Vladimir, Sretenović, Aleksandra, "Analiza rada toplotne pumpe vazduh-voda" in Zbornik radova 51 Međunarodni kongres o grejanju, hlađenju i klimatizaciji, 51 (2020),
https://doi.org/10.24094/kghk.020.51.1.31 . .

TY  - CONF
AU  - Ninković, Dimitrije
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Černicin, Vladimir
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5052
AB  - The paper analyzes the electric energy consumption of three different refrigeration installations: cascade refrigeration system with R134a in the high-temperature circuit and CO2 in the low-temperature circuit, single-stage refrigeration system operating with R404A, and two-stage transcritical CO2 system. The indirect impact of the refrigeration system on global warming through electric energy consumption was examined.
Thermodynamic cycles of these installations have been described and models have been developed to analyze the electric energy consumption required to drive the compressor as the largest consumer, for the cooling capacity of the evaporator 5,7 kW at evaporation temperature -30 °C for meteorological 2017, in the city of Belgrade. As a basis for comparative analysis, the existing cascade refrigeration system, which is located in the Laboratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade, was selected.
PB  - Beograd: SMEITS
C3  - Zbornik 50. Međunarodnog kongresa o KGH
T1  - COMPARATIVE ANALYSIS OF ELECTRIC ENERGY CONSUMPTION OF CASCADE SYSTEM R134a/CO2 WITH SINGLE-STAGE R404A AND TWO-STAGE CO2 INSTALLATION
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5052
ER  - 

@conference{
author = "Ninković, Dimitrije and Milovančević, Uroš and Otović, Milena and Černicin, Vladimir",
year = "2020",
abstract = "The paper analyzes the electric energy consumption of three different refrigeration installations: cascade refrigeration system with R134a in the high-temperature circuit and CO2 in the low-temperature circuit, single-stage refrigeration system operating with R404A, and two-stage transcritical CO2 system. The indirect impact of the refrigeration system on global warming through electric energy consumption was examined.
Thermodynamic cycles of these installations have been described and models have been developed to analyze the electric energy consumption required to drive the compressor as the largest consumer, for the cooling capacity of the evaporator 5,7 kW at evaporation temperature -30 °C for meteorological 2017, in the city of Belgrade. As a basis for comparative analysis, the existing cascade refrigeration system, which is located in the Laboratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade, was selected.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 50. Međunarodnog kongresa o KGH",
title = "COMPARATIVE ANALYSIS OF ELECTRIC ENERGY CONSUMPTION OF CASCADE SYSTEM R134a/CO2 WITH SINGLE-STAGE R404A AND TWO-STAGE CO2 INSTALLATION",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5052"
}

Ninković, D., Milovančević, U., Otović, M.,& Černicin, V.. (2020). COMPARATIVE ANALYSIS OF ELECTRIC ENERGY CONSUMPTION OF CASCADE SYSTEM R134a/CO2 WITH SINGLE-STAGE R404A AND TWO-STAGE CO2 INSTALLATION. in Zbornik 50. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5052

Ninković D, Milovančević U, Otović M, Černicin V. COMPARATIVE ANALYSIS OF ELECTRIC ENERGY CONSUMPTION OF CASCADE SYSTEM R134a/CO2 WITH SINGLE-STAGE R404A AND TWO-STAGE CO2 INSTALLATION. in Zbornik 50. Međunarodnog kongresa o KGH. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_5052 .

Ninković, Dimitrije, Milovančević, Uroš, Otović, Milena, Černicin, Vladimir, "COMPARATIVE ANALYSIS OF ELECTRIC ENERGY CONSUMPTION OF CASCADE SYSTEM R134a/CO2 WITH SINGLE-STAGE R404A AND TWO-STAGE CO2 INSTALLATION" in Zbornik 50. Međunarodnog kongresa o KGH (2020),
https://hdl.handle.net/21.15107/rcub_machinery_5052 .

TY  - JOUR
AU  - Milovančević, Uroš
AU  - Jaćimović, Branislav M.
AU  - Genić, Srbislav
AU  - El-Sagier, Faraj
AU  - Otović, Milena
AU  - Stevanović, Snežana M.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3233
AB  - Thermoeconomic analysis of spiral heat exchanger is conducted. Different geometrical parameters, such as outer diameter, plate height, passage gap, etc. are used and varied in a wide range. Detailed thermal and total costs analyses were performed for two spiral heat exchanger with different process fluids (water and thermal oil) with temperature changes, while the wall temperature was kept constant (condensation). The results were shown graphically. It is determined that optimum values of number of entropy generation units correspond to minimum total annual cost. The optimal solution could be found in the recommended range of geometric sizes for defined inlet and outlet temperatures and process fluid-flow rate.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Thermoeconomic analysis of spiral heat exchanger with constant wall temperature
EP  - 410
IS  - 1
SP  - 401
VL  - 23
DO  - 10.2298/TSCI170605150M
ER  - 

@article{
author = "Milovančević, Uroš and Jaćimović, Branislav M. and Genić, Srbislav and El-Sagier, Faraj and Otović, Milena and Stevanović, Snežana M.",
year = "2019",
abstract = "Thermoeconomic analysis of spiral heat exchanger is conducted. Different geometrical parameters, such as outer diameter, plate height, passage gap, etc. are used and varied in a wide range. Detailed thermal and total costs analyses were performed for two spiral heat exchanger with different process fluids (water and thermal oil) with temperature changes, while the wall temperature was kept constant (condensation). The results were shown graphically. It is determined that optimum values of number of entropy generation units correspond to minimum total annual cost. The optimal solution could be found in the recommended range of geometric sizes for defined inlet and outlet temperatures and process fluid-flow rate.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Thermoeconomic analysis of spiral heat exchanger with constant wall temperature",
pages = "410-401",
number = "1",
volume = "23",
doi = "10.2298/TSCI170605150M"
}

Milovančević, U., Jaćimović, B. M., Genić, S., El-Sagier, F., Otović, M.,& Stevanović, S. M.. (2019). Thermoeconomic analysis of spiral heat exchanger with constant wall temperature. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 23(1), 401-410.
https://doi.org/10.2298/TSCI170605150M

Milovančević U, Jaćimović BM, Genić S, El-Sagier F, Otović M, Stevanović SM. Thermoeconomic analysis of spiral heat exchanger with constant wall temperature. in Thermal Science. 2019;23(1):401-410.
doi:10.2298/TSCI170605150M .

Milovančević, Uroš, Jaćimović, Branislav M., Genić, Srbislav, El-Sagier, Faraj, Otović, Milena, Stevanović, Snežana M., "Thermoeconomic analysis of spiral heat exchanger with constant wall temperature" in Thermal Science, 23, no. 1 (2019):401-410,
https://doi.org/10.2298/TSCI170605150M . .

TY  - JOUR
AU  - Marković, Sasa
AU  - Jaćimović, Branislav M.
AU  - Genić, Srbislav
AU  - Mihailović, Miloš
AU  - Milovančević, Uroš
AU  - Otović, Milena
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3095
AB  - Previous researches have proved that newly introduced parameters such as void velocity and others can be successfully used for correlating the heat transfer and pressure drop parameters. In order to establish a reliable procedure for estimation of air pressure drop, experiments on plate finned tube heat exchangers have been conducted, as well as the extensive investigation of the open literature. Using own and previously published experimental data, new correlation for estimation of air pressure drop have been established, covering a wide range of parameters of industrial importance. New correlation is comprehensive and statistically superior to any other pressure drop correlation.
PB  - Elsevier Sci Ltd, Oxford
T2  - International Journal of Refrigeration-Revue Internationale Du Froid
T1  - Air side pressure drop in plate finned tube heat exchangers
EP  - 36
SP  - 24
VL  - 99
DO  - 10.1016/j.ijrefrig.2018.11.038
ER  - 

@article{
author = "Marković, Sasa and Jaćimović, Branislav M. and Genić, Srbislav and Mihailović, Miloš and Milovančević, Uroš and Otović, Milena",
year = "2019",
abstract = "Previous researches have proved that newly introduced parameters such as void velocity and others can be successfully used for correlating the heat transfer and pressure drop parameters. In order to establish a reliable procedure for estimation of air pressure drop, experiments on plate finned tube heat exchangers have been conducted, as well as the extensive investigation of the open literature. Using own and previously published experimental data, new correlation for estimation of air pressure drop have been established, covering a wide range of parameters of industrial importance. New correlation is comprehensive and statistically superior to any other pressure drop correlation.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "International Journal of Refrigeration-Revue Internationale Du Froid",
title = "Air side pressure drop in plate finned tube heat exchangers",
pages = "36-24",
volume = "99",
doi = "10.1016/j.ijrefrig.2018.11.038"
}

Marković, S., Jaćimović, B. M., Genić, S., Mihailović, M., Milovančević, U.,& Otović, M.. (2019). Air side pressure drop in plate finned tube heat exchangers. in International Journal of Refrigeration-Revue Internationale Du Froid
Elsevier Sci Ltd, Oxford., 99, 24-36.
https://doi.org/10.1016/j.ijrefrig.2018.11.038

Marković S, Jaćimović BM, Genić S, Mihailović M, Milovančević U, Otović M. Air side pressure drop in plate finned tube heat exchangers. in International Journal of Refrigeration-Revue Internationale Du Froid. 2019;99:24-36.
doi:10.1016/j.ijrefrig.2018.11.038 .

Marković, Sasa, Jaćimović, Branislav M., Genić, Srbislav, Mihailović, Miloš, Milovančević, Uroš, Otović, Milena, "Air side pressure drop in plate finned tube heat exchangers" in International Journal of Refrigeration-Revue Internationale Du Froid, 99 (2019):24-36,
https://doi.org/10.1016/j.ijrefrig.2018.11.038 . .

TY  - JOUR
AU  - Genić, Srbislav
AU  - Jaćimović, Branislav M.
AU  - Milovančević, Uroš
AU  - Ivošević, Miloš
AU  - Otović, Milena
AU  - Antić, Milan I.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2941
AB  - The procedure for field testing of plate heat exchanger, considered as a black box, is presented in the paper. After the field measurements have been conducted, simple but unambiguous procedure has been used to establish heat performance parameters including the heat duty and fouling factor. Advantage of hereby presented method is that it can be used for analysis of any other similar heat transfer equipment.
PB  - Springer, New York
T2  - Heat and Mass Transfer
T1  - Thermal performances of a "black box" heat exchanger in district heating system
EP  - 873
IS  - 3
SP  - 867
VL  - 54
DO  - 10.1007/s00231-017-2182-5
ER  - 

@article{
author = "Genić, Srbislav and Jaćimović, Branislav M. and Milovančević, Uroš and Ivošević, Miloš and Otović, Milena and Antić, Milan I.",
year = "2018",
abstract = "The procedure for field testing of plate heat exchanger, considered as a black box, is presented in the paper. After the field measurements have been conducted, simple but unambiguous procedure has been used to establish heat performance parameters including the heat duty and fouling factor. Advantage of hereby presented method is that it can be used for analysis of any other similar heat transfer equipment.",
publisher = "Springer, New York",
journal = "Heat and Mass Transfer",
title = "Thermal performances of a "black box" heat exchanger in district heating system",
pages = "873-867",
number = "3",
volume = "54",
doi = "10.1007/s00231-017-2182-5"
}

Genić, S., Jaćimović, B. M., Milovančević, U., Ivošević, M., Otović, M.,& Antić, M. I.. (2018). Thermal performances of a "black box" heat exchanger in district heating system. in Heat and Mass Transfer
Springer, New York., 54(3), 867-873.
https://doi.org/10.1007/s00231-017-2182-5

Genić S, Jaćimović BM, Milovančević U, Ivošević M, Otović M, Antić MI. Thermal performances of a "black box" heat exchanger in district heating system. in Heat and Mass Transfer. 2018;54(3):867-873.
doi:10.1007/s00231-017-2182-5 .

Genić, Srbislav, Jaćimović, Branislav M., Milovančević, Uroš, Ivošević, Miloš, Otović, Milena, Antić, Milan I., "Thermal performances of a "black box" heat exchanger in district heating system" in Heat and Mass Transfer, 54, no. 3 (2018):867-873,
https://doi.org/10.1007/s00231-017-2182-5 . .

TY  - JOUR
AU  - Otović, Milena
AU  - Mihailović, Miloš
AU  - Genić, Srbislav
AU  - Jaćimović, Branislav M.
AU  - Milovančević, Uroš
AU  - Marković, Sasa
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2870
AB  - This paper deals with heat exchangers having plain finned tubes in staggered (triangular) pattern. The objective of this paper is to provide the heat transfer and friction factor correlation which can be used in engineering practice. For this purpose, the experimental data of several (most cited) authors who deal with this type of heat exchangers are used. The new correlations are established to predict the air-side heat transfer coefficient and friction factor as a function of the Reynolds number and geometric variables of the heat exchanger - tube diameter, tube pitch, fin spacing, tube rows, etc. In those correlations the characteristic dimension in Reynolds number is calculated by using the new parameter - volumetric porosity. Also, there are given the errors of those correlations.
PB  - Springer, New York
T2  - Heat and Mass Transfer
T1  - Reconsideration of data and correlations for plate finned-tube heat exchangers
EP  - 2994
IS  - 10
SP  - 2987
VL  - 54
DO  - 10.1007/s00231-018-2328-0
ER  - 

@article{
author = "Otović, Milena and Mihailović, Miloš and Genić, Srbislav and Jaćimović, Branislav M. and Milovančević, Uroš and Marković, Sasa",
year = "2018",
abstract = "This paper deals with heat exchangers having plain finned tubes in staggered (triangular) pattern. The objective of this paper is to provide the heat transfer and friction factor correlation which can be used in engineering practice. For this purpose, the experimental data of several (most cited) authors who deal with this type of heat exchangers are used. The new correlations are established to predict the air-side heat transfer coefficient and friction factor as a function of the Reynolds number and geometric variables of the heat exchanger - tube diameter, tube pitch, fin spacing, tube rows, etc. In those correlations the characteristic dimension in Reynolds number is calculated by using the new parameter - volumetric porosity. Also, there are given the errors of those correlations.",
publisher = "Springer, New York",
journal = "Heat and Mass Transfer",
title = "Reconsideration of data and correlations for plate finned-tube heat exchangers",
pages = "2994-2987",
number = "10",
volume = "54",
doi = "10.1007/s00231-018-2328-0"
}

Otović, M., Mihailović, M., Genić, S., Jaćimović, B. M., Milovančević, U.,& Marković, S.. (2018). Reconsideration of data and correlations for plate finned-tube heat exchangers. in Heat and Mass Transfer
Springer, New York., 54(10), 2987-2994.
https://doi.org/10.1007/s00231-018-2328-0

Otović M, Mihailović M, Genić S, Jaćimović BM, Milovančević U, Marković S. Reconsideration of data and correlations for plate finned-tube heat exchangers. in Heat and Mass Transfer. 2018;54(10):2987-2994.
doi:10.1007/s00231-018-2328-0 .

Otović, Milena, Mihailović, Miloš, Genić, Srbislav, Jaćimović, Branislav M., Milovančević, Uroš, Marković, Sasa, "Reconsideration of data and correlations for plate finned-tube heat exchangers" in Heat and Mass Transfer, 54, no. 10 (2018):2987-2994,
https://doi.org/10.1007/s00231-018-2328-0 . .

TY  - GEN
AU  - Milovančević, Uroš
AU  - Otović, Milena
AU  - Franc, Kosi
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5975
AB  - The objective of this paper is emphasizing the importance of maintaining the cooling systems from
the perspective of exploitation safety. The comparative analysis of the natural and synthetic refrigerants is
made. An overview of the location of possible operation problems is given. There are cited the most
common mistakes of industrial cooling installations that hinder maintenance and lead to incidents followed
by leaking in the exploitation conditions. The accent is put on parts of refrigeration installations at high
pressure in specific periods of operating (evaporator defrosting). Special attention should be paid on
monitoring of leaking in liquid lines (especially with over-flooded systems). Finally, the routes and
suggestions for better maintenance and safety improvements are given.
T2  - Proceedings of 2nd Maintenance Forum on Maintenance and Asset Management
T1  - MAINTENANCE AND RELIABILITY OF INDUSTRIAL REFRIGERATION SYSTEMS
EP  - 119
SP  - 112
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5975
ER  - 

@misc{
author = "Milovančević, Uroš and Otović, Milena and Franc, Kosi",
year = "2017",
abstract = "The objective of this paper is emphasizing the importance of maintaining the cooling systems from
the perspective of exploitation safety. The comparative analysis of the natural and synthetic refrigerants is
made. An overview of the location of possible operation problems is given. There are cited the most
common mistakes of industrial cooling installations that hinder maintenance and lead to incidents followed
by leaking in the exploitation conditions. The accent is put on parts of refrigeration installations at high
pressure in specific periods of operating (evaporator defrosting). Special attention should be paid on
monitoring of leaking in liquid lines (especially with over-flooded systems). Finally, the routes and
suggestions for better maintenance and safety improvements are given.",
journal = "Proceedings of 2nd Maintenance Forum on Maintenance and Asset Management",
title = "MAINTENANCE AND RELIABILITY OF INDUSTRIAL REFRIGERATION SYSTEMS",
pages = "119-112",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5975"
}

Milovančević, U., Otović, M.,& Franc, K.. (2017). MAINTENANCE AND RELIABILITY OF INDUSTRIAL REFRIGERATION SYSTEMS. in Proceedings of 2nd Maintenance Forum on Maintenance and Asset Management, 112-119.
https://hdl.handle.net/21.15107/rcub_machinery_5975

Milovančević U, Otović M, Franc K. MAINTENANCE AND RELIABILITY OF INDUSTRIAL REFRIGERATION SYSTEMS. in Proceedings of 2nd Maintenance Forum on Maintenance and Asset Management. 2017;:112-119.
https://hdl.handle.net/21.15107/rcub_machinery_5975 .

Milovančević, Uroš, Otović, Milena, Franc, Kosi, "MAINTENANCE AND RELIABILITY OF INDUSTRIAL REFRIGERATION SYSTEMS" in Proceedings of 2nd Maintenance Forum on Maintenance and Asset Management (2017):112-119,
https://hdl.handle.net/21.15107/rcub_machinery_5975 .

TY  - JOUR
AU  - Stevanović, Snežana M.
AU  - Radojević, Rade
AU  - Marković, Dragan
AU  - Otović, Milena
AU  - Milovančević, Uroš
AU  - Simonović, Vojislav
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5541
AB  - Fruit has a significant place in the total value of agricultural production in Serbia and an increasing amount of fresh fruits has been exported recently. For a more significant placement of fresh food on foreign markets, it is necessary to provide quality protection during transport and storage. Postharvest losses of fresh fruits and vegetables are very high, especially in undeveloped countries. Therefore, modern postharvest technologies, such as modified and controlled atmosphere, are increasingly used to prolong storage life of fresh fruits. ULO (Ultra Low Oxygen) controlled atmosphere has suppressed all other solutions in terms of quality and prolonged storage life (up to 300 days) of apples. In this paper, the optimum conditions and recommended storage regimes for different apple varieties in ULO atmosphere have been reported.
PB  - Beograd: SMEITS
T2  - KGH. Klimatizacija, grejanje, hlađenje
T1  - Storing apples in ULO atmosphere controlled cold storage
IS  - 4
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5541
ER  - 

@article{
author = "Stevanović, Snežana M. and Radojević, Rade and Marković, Dragan and Otović, Milena and Milovančević, Uroš and Simonović, Vojislav",
year = "2017",
abstract = "Fruit has a significant place in the total value of agricultural production in Serbia and an increasing amount of fresh fruits has been exported recently. For a more significant placement of fresh food on foreign markets, it is necessary to provide quality protection during transport and storage. Postharvest losses of fresh fruits and vegetables are very high, especially in undeveloped countries. Therefore, modern postharvest technologies, such as modified and controlled atmosphere, are increasingly used to prolong storage life of fresh fruits. ULO (Ultra Low Oxygen) controlled atmosphere has suppressed all other solutions in terms of quality and prolonged storage life (up to 300 days) of apples. In this paper, the optimum conditions and recommended storage regimes for different apple varieties in ULO atmosphere have been reported.",
publisher = "Beograd: SMEITS",
journal = "KGH. Klimatizacija, grejanje, hlađenje",
title = "Storing apples in ULO atmosphere controlled cold storage",
number = "4",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5541"
}

Stevanović, S. M., Radojević, R., Marković, D., Otović, M., Milovančević, U.,& Simonović, V.. (2017). Storing apples in ULO atmosphere controlled cold storage. in KGH. Klimatizacija, grejanje, hlađenje
Beograd: SMEITS., 46(4).
https://hdl.handle.net/21.15107/rcub_machinery_5541

Stevanović SM, Radojević R, Marković D, Otović M, Milovančević U, Simonović V. Storing apples in ULO atmosphere controlled cold storage. in KGH. Klimatizacija, grejanje, hlađenje. 2017;46(4).
https://hdl.handle.net/21.15107/rcub_machinery_5541 .

Stevanović, Snežana M., Radojević, Rade, Marković, Dragan, Otović, Milena, Milovančević, Uroš, Simonović, Vojislav, "Storing apples in ULO atmosphere controlled cold storage" in KGH. Klimatizacija, grejanje, hlađenje, 46, no. 4 (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5541 .

TY  - CONF
AU  - Otović, Milena
AU  - Komatina, Mirko
AU  - Rudonja, Nedžad
AU  - Milovančević, Uroš
AU  - Otović, Srđan
AU  - Stevanović, Snežana M.
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5537
AB  - In this paper it is considered the possibility of using geothermal energy in the territory of Republic Serbia in the systems that run an organic Rankine cycle (ORC) with R245fa as the working fluid. Although the most common geothermal resources that can be encountered in the territory of RS is moderate water temperature, geothermal water from the locality Vranjska Banja with a highest temperature of 96°C was adopted as a heat source for driving this system. This system was compared with the conventional system for electricity production of the same power (Rankine cycle with water as the working fluid and coal–fired boiler), in order to calculate the annually reduction in CO2 emission into the atmosphere from the burning of conventional fuel, as well as the savings in its consumption.
PB  - Beograd: SMEITS
C3  - Zbornik 47. Međunarodnog kongresa o KGH
T1  - THE USE OF GEOTHERMAL ENERGY IN ORGANIC RANKINE CYCLE
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5537
ER  - 

@conference{
author = "Otović, Milena and Komatina, Mirko and Rudonja, Nedžad and Milovančević, Uroš and Otović, Srđan and Stevanović, Snežana M.",
year = "2016",
abstract = "In this paper it is considered the possibility of using geothermal energy in the territory of Republic Serbia in the systems that run an organic Rankine cycle (ORC) with R245fa as the working fluid. Although the most common geothermal resources that can be encountered in the territory of RS is moderate water temperature, geothermal water from the locality Vranjska Banja with a highest temperature of 96°C was adopted as a heat source for driving this system. This system was compared with the conventional system for electricity production of the same power (Rankine cycle with water as the working fluid and coal–fired boiler), in order to calculate the annually reduction in CO2 emission into the atmosphere from the burning of conventional fuel, as well as the savings in its consumption.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 47. Međunarodnog kongresa o KGH",
title = "THE USE OF GEOTHERMAL ENERGY IN ORGANIC RANKINE CYCLE",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5537"
}

Otović, M., Komatina, M., Rudonja, N., Milovančević, U., Otović, S.,& Stevanović, S. M.. (2016). THE USE OF GEOTHERMAL ENERGY IN ORGANIC RANKINE CYCLE. in Zbornik 47. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5537

Otović M, Komatina M, Rudonja N, Milovančević U, Otović S, Stevanović SM. THE USE OF GEOTHERMAL ENERGY IN ORGANIC RANKINE CYCLE. in Zbornik 47. Međunarodnog kongresa o KGH. 2016;.
https://hdl.handle.net/21.15107/rcub_machinery_5537 .

Otović, Milena, Komatina, Mirko, Rudonja, Nedžad, Milovančević, Uroš, Otović, Srđan, Stevanović, Snežana M., "THE USE OF GEOTHERMAL ENERGY IN ORGANIC RANKINE CYCLE" in Zbornik 47. Međunarodnog kongresa o KGH (2016),
https://hdl.handle.net/21.15107/rcub_machinery_5537 .

TY  - CONF
AU  - Milovančević, Uroš
AU  - Genić, Srbislav
AU  - Otović, Milena
AU  - Stevanović, Snežana M.
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5538
AB  - The paper deals with the problems of measurement of respective operating parameters of air cooler with finned tubes. It is given a PI diagram of the tested refrigeration system. The most important geometrical characteristics of this heat exchanger are shown. Experimental work included measurement of thermal performance on a physical model – the heat exchanger, which cooled the air by using secondary refrigerant, which has not changed phase flowing through the pipes. Flow rates and temperatures of working fluids were varied in defined operating ranges of experimental installation, which were sufficient to make generalization of experimentally obtained data. In conclusion, it is given the most important results that were obtained during the experimental and mathematical analysis of this exchanger in terms of cooling and drying air.
PB  - Beograd: SMEITS
C3  - Zbornik 47. Međunarodnog kongresa o KGH
T1  - PERFORMANCES INVESTIGATION OF FINNED TUBE AIR COOLER
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5538
ER  - 

@conference{
author = "Milovančević, Uroš and Genić, Srbislav and Otović, Milena and Stevanović, Snežana M.",
year = "2016",
abstract = "The paper deals with the problems of measurement of respective operating parameters of air cooler with finned tubes. It is given a PI diagram of the tested refrigeration system. The most important geometrical characteristics of this heat exchanger are shown. Experimental work included measurement of thermal performance on a physical model – the heat exchanger, which cooled the air by using secondary refrigerant, which has not changed phase flowing through the pipes. Flow rates and temperatures of working fluids were varied in defined operating ranges of experimental installation, which were sufficient to make generalization of experimentally obtained data. In conclusion, it is given the most important results that were obtained during the experimental and mathematical analysis of this exchanger in terms of cooling and drying air.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 47. Međunarodnog kongresa o KGH",
title = "PERFORMANCES INVESTIGATION OF FINNED TUBE AIR COOLER",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5538"
}

Milovančević, U., Genić, S., Otović, M.,& Stevanović, S. M.. (2016). PERFORMANCES INVESTIGATION OF FINNED TUBE AIR COOLER. in Zbornik 47. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5538

Milovančević U, Genić S, Otović M, Stevanović SM. PERFORMANCES INVESTIGATION OF FINNED TUBE AIR COOLER. in Zbornik 47. Međunarodnog kongresa o KGH. 2016;.
https://hdl.handle.net/21.15107/rcub_machinery_5538 .

Milovančević, Uroš, Genić, Srbislav, Otović, Milena, Stevanović, Snežana M., "PERFORMANCES INVESTIGATION OF FINNED TUBE AIR COOLER" in Zbornik 47. Međunarodnog kongresa o KGH (2016),
https://hdl.handle.net/21.15107/rcub_machinery_5538 .

TY  - GEN
AU  - Kosi, Franc
AU  - Marković, Dragan
AU  - Milovančević, Uroš
AU  - Stojković, Milena
AU  - Sretenović, Aleksandra
AU  - Živković, Branislav
AU  - Stevanović, Snežana M.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5194
T1  - Kaskadni sistemi (NH3/CO2) za primenu u prehrambenoj industriji
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5194
ER  - 

@misc{
author = "Kosi, Franc and Marković, Dragan and Milovančević, Uroš and Stojković, Milena and Sretenović, Aleksandra and Živković, Branislav and Stevanović, Snežana M.",
year = "2015",
title = "Kaskadni sistemi (NH3/CO2) za primenu u prehrambenoj industriji",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5194"
}

Kosi, F., Marković, D., Milovančević, U., Stojković, M., Sretenović, A., Živković, B.,& Stevanović, S. M.. (2015). Kaskadni sistemi (NH3/CO2) za primenu u prehrambenoj industriji. .
https://hdl.handle.net/21.15107/rcub_machinery_5194

Kosi F, Marković D, Milovančević U, Stojković M, Sretenović A, Živković B, Stevanović SM. Kaskadni sistemi (NH3/CO2) za primenu u prehrambenoj industriji. 2015;.
https://hdl.handle.net/21.15107/rcub_machinery_5194 .

Kosi, Franc, Marković, Dragan, Milovančević, Uroš, Stojković, Milena, Sretenović, Aleksandra, Živković, Branislav, Stevanović, Snežana M., "Kaskadni sistemi (NH3/CO2) za primenu u prehrambenoj industriji" (2015),
https://hdl.handle.net/21.15107/rcub_machinery_5194 .

TY  - GEN
AU  - Živković, Branislav
AU  - Kosi, Franc
AU  - Marković, Dragan
AU  - Milovančević, Uroš
AU  - Stojković, Milena
AU  - Sretenović, Aleksandra
AU  - Krstić, Dragan
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5196
T1  - Sprega konvenvionalnih i obnovljivih izvora energije u okviru tehnološke linije za rashlađivanje i skladištenje voća
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5196
ER  - 

@misc{
author = "Živković, Branislav and Kosi, Franc and Marković, Dragan and Milovančević, Uroš and Stojković, Milena and Sretenović, Aleksandra and Krstić, Dragan",
year = "2015",
title = "Sprega konvenvionalnih i obnovljivih izvora energije u okviru tehnološke linije za rashlađivanje i skladištenje voća",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5196"
}

Živković, B., Kosi, F., Marković, D., Milovančević, U., Stojković, M., Sretenović, A.,& Krstić, D.. (2015). Sprega konvenvionalnih i obnovljivih izvora energije u okviru tehnološke linije za rashlađivanje i skladištenje voća. .
https://hdl.handle.net/21.15107/rcub_machinery_5196

Živković B, Kosi F, Marković D, Milovančević U, Stojković M, Sretenović A, Krstić D. Sprega konvenvionalnih i obnovljivih izvora energije u okviru tehnološke linije za rashlađivanje i skladištenje voća. 2015;.
https://hdl.handle.net/21.15107/rcub_machinery_5196 .

Živković, Branislav, Kosi, Franc, Marković, Dragan, Milovančević, Uroš, Stojković, Milena, Sretenović, Aleksandra, Krstić, Dragan, "Sprega konvenvionalnih i obnovljivih izvora energije u okviru tehnološke linije za rashlađivanje i skladištenje voća" (2015),
https://hdl.handle.net/21.15107/rcub_machinery_5196 .

TY  - GEN
AU  - Kosi, Franc
AU  - Marković, Dragan
AU  - Živković, Branislav
AU  - Pokrajac, Slobodan
AU  - Stojković, Milena
AU  - Sretenović, Aleksandra
AU  - Krstić, Dragan
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5195
T1  - Indirektni sistem za skladištenje osetljivih vrsta voća u kontrolisanoj atmosferi
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5195
ER  - 

@misc{
author = "Kosi, Franc and Marković, Dragan and Živković, Branislav and Pokrajac, Slobodan and Stojković, Milena and Sretenović, Aleksandra and Krstić, Dragan",
year = "2015",
title = "Indirektni sistem za skladištenje osetljivih vrsta voća u kontrolisanoj atmosferi",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5195"
}

Kosi, F., Marković, D., Živković, B., Pokrajac, S., Stojković, M., Sretenović, A.,& Krstić, D.. (2015). Indirektni sistem za skladištenje osetljivih vrsta voća u kontrolisanoj atmosferi. .
https://hdl.handle.net/21.15107/rcub_machinery_5195

Kosi F, Marković D, Živković B, Pokrajac S, Stojković M, Sretenović A, Krstić D. Indirektni sistem za skladištenje osetljivih vrsta voća u kontrolisanoj atmosferi. 2015;.
https://hdl.handle.net/21.15107/rcub_machinery_5195 .

Kosi, Franc, Marković, Dragan, Živković, Branislav, Pokrajac, Slobodan, Stojković, Milena, Sretenović, Aleksandra, Krstić, Dragan, "Indirektni sistem za skladištenje osetljivih vrsta voća u kontrolisanoj atmosferi" (2015),
https://hdl.handle.net/21.15107/rcub_machinery_5195 .