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  - Černicin, Vladimir
AU  - Zhang, Wenying
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5734
AB  - The use of an internal heat exchanger (IHX) as a cycle improvement measure is very common with CO2 systems. However, a simple thermodynamic analysis is not able to fully indicate the advantages of IHX in a single-stage system. For this reason, in this paper, the effect of the internal heat exchanger on the reversible CO2 system, which can work in both air-conditioning and heating mode, was experimentally investigated. Experiments were performed under various conditions for both operating modes, with and without an internal heat exchanger. The results of the experiments showed that in the heating mode (heat pump) the coefficient of performance (COP) can be increased up to 10,5% by introducing the internal heat exchanger, while in the air-conditioning mode, the COP can be increased up to 13,8%. Also, it has been shown that this improvement provides safer system operation and less frost formation on the evaporator.
PB  - Beograd: SMEITS
C3  - Zbornik 53. Međunarodnog kongresa o KGH, 2022
T1  - THE EFFECT OF INTERNAL HEAT EXCHANGER IN A REVERSIBLE CO2 SYSTEM UNDER VARIOUS OPERATING CONDITIONS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5734
ER  - 

@conference{
author = "Černicin, Vladimir and Zhang, Wenying",
year = "2023",
abstract = "The use of an internal heat exchanger (IHX) as a cycle improvement measure is very common with CO2 systems. However, a simple thermodynamic analysis is not able to fully indicate the advantages of IHX in a single-stage system. For this reason, in this paper, the effect of the internal heat exchanger on the reversible CO2 system, which can work in both air-conditioning and heating mode, was experimentally investigated. Experiments were performed under various conditions for both operating modes, with and without an internal heat exchanger. The results of the experiments showed that in the heating mode (heat pump) the coefficient of performance (COP) can be increased up to 10,5% by introducing the internal heat exchanger, while in the air-conditioning mode, the COP can be increased up to 13,8%. Also, it has been shown that this improvement provides safer system operation and less frost formation on the evaporator.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 53. Međunarodnog kongresa o KGH, 2022",
title = "THE EFFECT OF INTERNAL HEAT EXCHANGER IN A REVERSIBLE CO2 SYSTEM UNDER VARIOUS OPERATING CONDITIONS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5734"
}

Černicin, V.,& Zhang, W.. (2023). THE EFFECT OF INTERNAL HEAT EXCHANGER IN A REVERSIBLE CO2 SYSTEM UNDER VARIOUS OPERATING CONDITIONS. in Zbornik 53. Međunarodnog kongresa o KGH, 2022
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5734

Černicin V, Zhang W. THE EFFECT OF INTERNAL HEAT EXCHANGER IN A REVERSIBLE CO2 SYSTEM UNDER VARIOUS OPERATING CONDITIONS. in Zbornik 53. Međunarodnog kongresa o KGH, 2022. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_5734 .

Černicin, Vladimir, Zhang, Wenying, "THE EFFECT OF INTERNAL HEAT EXCHANGER IN A REVERSIBLE CO2 SYSTEM UNDER VARIOUS OPERATING CONDITIONS" in Zbornik 53. Međunarodnog kongresa o KGH, 2022 (2023),
https://hdl.handle.net/21.15107/rcub_machinery_5734 .

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  - CONF
AU  - Tamindžić, Jaško
AU  - Tucović, Milica
AU  - Sretenović, Aleksandra
AU  - Milovančević, Uroš
AU  - Černicin, Vladimir
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5539
AB  - The largest amount of energy in Serbia households is spent on heating needs. Therefore, the main idea of this paper is to compare the heating bills for a residential building in Belgrade using various energy sources. Electric boiler, gas-fired condensing boiler, and air-to-water heat pump are analyzed. For calculating expenses, the current electricity and gas rates in Serbia have been used. For selected cases, both primary energy use and CO2 emission have been compared.
PB  - Beograd: SMEITS
C3  - Zbornik 53. Međunarodnog kongresa o KGH
T1  - ANALYSIS OF ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING USING HOURLY SIMULATIONS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5539
ER  - 

@conference{
author = "Tamindžić, Jaško and Tucović, Milica and Sretenović, Aleksandra and Milovančević, Uroš and Černicin, Vladimir",
year = "2023",
abstract = "The largest amount of energy in Serbia households is spent on heating needs. Therefore, the main idea of this paper is to compare the heating bills for a residential building in Belgrade using various energy sources. Electric boiler, gas-fired condensing boiler, and air-to-water heat pump are analyzed. For calculating expenses, the current electricity and gas rates in Serbia have been used. For selected cases, both primary energy use and CO2 emission have been compared.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 53. Međunarodnog kongresa o KGH",
title = "ANALYSIS OF ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING USING HOURLY SIMULATIONS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5539"
}

Tamindžić, J., Tucović, M., Sretenović, A., Milovančević, U.,& Černicin, V.. (2023). ANALYSIS OF ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING USING HOURLY SIMULATIONS. in Zbornik 53. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5539

Tamindžić J, Tucović M, Sretenović A, Milovančević U, Černicin V. ANALYSIS OF ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING USING HOURLY SIMULATIONS. in Zbornik 53. Međunarodnog kongresa o KGH. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_5539 .

Tamindžić, Jaško, Tucović, Milica, Sretenović, Aleksandra, Milovančević, Uroš, Černicin, Vladimir, "ANALYSIS OF ENERGY CONSUMPTION OF A RESIDENTIAL BUILDING USING HOURLY SIMULATIONS" in Zbornik 53. Međunarodnog kongresa o KGH (2023),
https://hdl.handle.net/21.15107/rcub_machinery_5539 .

TY  - CONF
AU  - Zhang, Wenying
AU  - Černicin, Vladimir
AU  - Hrnjak, Pega
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5733
AB  - This paper first presents a comprehensive review of the internal heat exchanger, followed by the discussion of experimental results of the role of an internal heat exchanger in an R744 air conditioning system. The effects of refrigerant charge amount on the performance of both basic and internal heat exchanger systems were investigated. Also, the control equations of COP-maximizing high-side pressure were developed and used for both systems. The experimental data show up to 13.8% improvement in efficiency by introducing the internal heat exchanger. The different roles of IHX in sub- and transcritical modes and the reason for the difference are discussed in the paper.
PB  - Purdue University, Ray W. Herrick Laboratories
C3  - Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue
T1  - THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE AIR-CONDITIONING MODE UNDER VARIOUS CONDITIONS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5733
ER  - 

@conference{
author = "Zhang, Wenying and Černicin, Vladimir and Hrnjak, Pega",
year = "2022",
abstract = "This paper first presents a comprehensive review of the internal heat exchanger, followed by the discussion of experimental results of the role of an internal heat exchanger in an R744 air conditioning system. The effects of refrigerant charge amount on the performance of both basic and internal heat exchanger systems were investigated. Also, the control equations of COP-maximizing high-side pressure were developed and used for both systems. The experimental data show up to 13.8% improvement in efficiency by introducing the internal heat exchanger. The different roles of IHX in sub- and transcritical modes and the reason for the difference are discussed in the paper.",
publisher = "Purdue University, Ray W. Herrick Laboratories",
journal = "Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue",
title = "THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE AIR-CONDITIONING MODE UNDER VARIOUS CONDITIONS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5733"
}

Zhang, W., Černicin, V.,& Hrnjak, P.. (2022). THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE AIR-CONDITIONING MODE UNDER VARIOUS CONDITIONS. in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue
Purdue University, Ray W. Herrick Laboratories..
https://hdl.handle.net/21.15107/rcub_machinery_5733

Zhang W, Černicin V, Hrnjak P. THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE AIR-CONDITIONING MODE UNDER VARIOUS CONDITIONS. in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5733 .

Zhang, Wenying, Černicin, Vladimir, Hrnjak, Pega, "THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE AIR-CONDITIONING MODE UNDER VARIOUS CONDITIONS" in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5733 .

TY  - CONF
AU  - Paunić, Milovan
AU  - Černicin, Vladimir
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5677
AB  - When making mechanical components, geometric imperfections are common, which in certain cases can cause a weak spot or some form of crack. Depending on the intensity and position of the action of forces on the mechanical component, its bearing capacity or load that the structure can carry with a given degree of safety directly results. The paper will compare the critical values of the stress intensity factor, as a basic element of fracture mechanics, obtained by empirical formulas and the values obtained by applying the finite element method. Using Abaqus, the values were verified numerically and the results of the analysis can be considered validated. The results showed deviations in the acceptable range and the application of the finite element method to the analysis of cracks in the material confirmed that Abaqus can also be used as an excellent tool in the analysis of fracture mechanics.
PB  - University of Belgrade Faculty of Mechanical Engineering, Belgrade
C3  - Proceedings of 8th International Conference of Industrial Engineering
T1  - APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5677
ER  - 

@conference{
author = "Paunić, Milovan and Černicin, Vladimir",
year = "2022",
abstract = "When making mechanical components, geometric imperfections are common, which in certain cases can cause a weak spot or some form of crack. Depending on the intensity and position of the action of forces on the mechanical component, its bearing capacity or load that the structure can carry with a given degree of safety directly results. The paper will compare the critical values of the stress intensity factor, as a basic element of fracture mechanics, obtained by empirical formulas and the values obtained by applying the finite element method. Using Abaqus, the values were verified numerically and the results of the analysis can be considered validated. The results showed deviations in the acceptable range and the application of the finite element method to the analysis of cracks in the material confirmed that Abaqus can also be used as an excellent tool in the analysis of fracture mechanics.",
publisher = "University of Belgrade Faculty of Mechanical Engineering, Belgrade",
journal = "Proceedings of 8th International Conference of Industrial Engineering",
title = "APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5677"
}

Paunić, M.,& Černicin, V.. (2022). APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS. in Proceedings of 8th International Conference of Industrial Engineering
University of Belgrade Faculty of Mechanical Engineering, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5677

Paunić M, Černicin V. APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS. in Proceedings of 8th International Conference of Industrial Engineering. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5677 .

Paunić, Milovan, Černicin, Vladimir, "APPLICATION OF FINITE ELEMENT METHOD FOR ANALYSIS THE PARAMETERS OF FRACTURE MECHANICS" in Proceedings of 8th International Conference of Industrial Engineering (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5677 .

TY  - CONF
AU  - Černicin, Vladimir
AU  - Zhang, Wenying
AU  - Hrnjak, Pega
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5665
AB  - In this paper, the role of the internal heat exchanger (IHX) in a reversible R744 vapor compression system in the heating mode was investigated experimentally and presented. At the first, the optimal refrigerant charge amount for both basic and the IHX systems was determined. Also, the control equations of HPF-maximizing high side pressure were developed and used for both systems. Then, well-tuned systems working at the optimal discharge pressure were compared in two scenarios under various conditions. The results of the experiments reveal the potential benefits of introducing IHX for the R744 system in the heating mode. The efficiency was improved by up to 10.5% by introducing the internal heat exchanger. Also, the benefits of IHX in the frosting conditions were discussed.
PB  - Purdue University, Ray W. Herrick Laboratories
C3  - Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue
T1  - THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE HEAT PUMP MODE UNDER VARIOUS CONDITIONS
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5665
ER  - 

@conference{
author = "Černicin, Vladimir and Zhang, Wenying and Hrnjak, Pega",
year = "2022",
abstract = "In this paper, the role of the internal heat exchanger (IHX) in a reversible R744 vapor compression system in the heating mode was investigated experimentally and presented. At the first, the optimal refrigerant charge amount for both basic and the IHX systems was determined. Also, the control equations of HPF-maximizing high side pressure were developed and used for both systems. Then, well-tuned systems working at the optimal discharge pressure were compared in two scenarios under various conditions. The results of the experiments reveal the potential benefits of introducing IHX for the R744 system in the heating mode. The efficiency was improved by up to 10.5% by introducing the internal heat exchanger. Also, the benefits of IHX in the frosting conditions were discussed.",
publisher = "Purdue University, Ray W. Herrick Laboratories",
journal = "Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue",
title = "THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE HEAT PUMP MODE UNDER VARIOUS CONDITIONS",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5665"
}

Černicin, V., Zhang, W.,& Hrnjak, P.. (2022). THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE HEAT PUMP MODE UNDER VARIOUS CONDITIONS. in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue
Purdue University, Ray W. Herrick Laboratories..
https://hdl.handle.net/21.15107/rcub_machinery_5665

Černicin V, Zhang W, Hrnjak P. THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE HEAT PUMP MODE UNDER VARIOUS CONDITIONS. in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5665 .

Černicin, Vladimir, Zhang, Wenying, Hrnjak, Pega, "THE ROLE OF INTERNAL HEAT EXCHANGER IN AN R744 VAPOR COMPRESSION SYSTEM IN THE HEAT PUMP MODE UNDER VARIOUS CONDITIONS" in Proceedings of 19th International Refrigeration and Air Conditioning Conference at Purdue (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5665 .

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  - Paunić, Milovan
AU  - Černicin, Vladimir
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5680
AB  - Composite materials are widely used in different industries because of their unique characteristics that can be adapted depending on the application. Prediction of mechanical properties before the production process enables time-saving and optimization of geometry and materials. The purpose of this paper is to show the steps in virtual modeling of the elementary unit of the unidirectional composite. The first step is the computer generation of the virtual domain that needs to geometrically match the experimental sample. After that, the mesh of finite elements must be defined, and apply algorithms for periodic border conditions. The next step is setting the boundary conditions and forces. After obtaining contour plots (homogenization method) mechanical characteristics and effective elastic constants of the composite can be predicted. Thanks to the implementation of the finite element method in the ABAQUS program, it is possible to predict the mechanical characteristics of the composite depending on the variation of different parameters of the composite.
PB  - University of Belgrade Faculty of Mechanical Engineering, Belgrade
C3  - Proceedings of 8th International Conference of Industrial Engineering
T1  - VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5680
ER  - 

@conference{
author = "Paunić, Milovan and Černicin, Vladimir",
year = "2022",
abstract = "Composite materials are widely used in different industries because of their unique characteristics that can be adapted depending on the application. Prediction of mechanical properties before the production process enables time-saving and optimization of geometry and materials. The purpose of this paper is to show the steps in virtual modeling of the elementary unit of the unidirectional composite. The first step is the computer generation of the virtual domain that needs to geometrically match the experimental sample. After that, the mesh of finite elements must be defined, and apply algorithms for periodic border conditions. The next step is setting the boundary conditions and forces. After obtaining contour plots (homogenization method) mechanical characteristics and effective elastic constants of the composite can be predicted. Thanks to the implementation of the finite element method in the ABAQUS program, it is possible to predict the mechanical characteristics of the composite depending on the variation of different parameters of the composite.",
publisher = "University of Belgrade Faculty of Mechanical Engineering, Belgrade",
journal = "Proceedings of 8th International Conference of Industrial Engineering",
title = "VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5680"
}

Paunić, M.,& Černicin, V.. (2022). VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE. in Proceedings of 8th International Conference of Industrial Engineering
University of Belgrade Faculty of Mechanical Engineering, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5680

Paunić M, Černicin V. VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE. in Proceedings of 8th International Conference of Industrial Engineering. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5680 .

Paunić, Milovan, Černicin, Vladimir, "VIRTUAL MODEL GENERATION OF REPRESENTATIVE VOLUME ELEMENT FOR UNIDIRECTIONAL COMPOSITE" in Proceedings of 8th International Conference of Industrial Engineering (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5680 .

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  - CONF
AU  - Paunić, Milovan
AU  - Jovanović, Miroslav
AU  - Černicin, Vladimir
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5673
AB  - Nitinol is a material widely known because of its super-elasticity characteristic which is important in the cyclic load area. Atherosclerosis is a disease of the modern age that involves blood vessels narrowing. If this condition is not properly treated, the consequences can be serious. Therefore, it is of great importance to study the optimal characteristics of the stent and the hemodynamic condition in the blood vessels. Self-expanding nitinol stents have been often used to treat arterial narrowing. This paper will analyze the influence of the ratio between the stent diameter and the blood vessel diameter and their correlation with radial forces in the case of atherosclerotic plaque or fibrous cap. Also, this paper will analyze recommended stent thickness to ensure satisfactory deformations at the end of the fatigue cycle.
PB  - Central Institute of Conservation, Belgrade
C3  - Proceedings of Selected Papers and Abstracts of The Third International Students Scientific Conference
T1  - OPTIMAL CHARACTERISTICS OF A SELF-EXPANDING NITINOL STENT UNDER THE ACTION OF ARTERIAL FORCES
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5673
ER  - 

@conference{
author = "Paunić, Milovan and Jovanović, Miroslav and Černicin, Vladimir",
year = "2019",
abstract = "Nitinol is a material widely known because of its super-elasticity characteristic which is important in the cyclic load area. Atherosclerosis is a disease of the modern age that involves blood vessels narrowing. If this condition is not properly treated, the consequences can be serious. Therefore, it is of great importance to study the optimal characteristics of the stent and the hemodynamic condition in the blood vessels. Self-expanding nitinol stents have been often used to treat arterial narrowing. This paper will analyze the influence of the ratio between the stent diameter and the blood vessel diameter and their correlation with radial forces in the case of atherosclerotic plaque or fibrous cap. Also, this paper will analyze recommended stent thickness to ensure satisfactory deformations at the end of the fatigue cycle.",
publisher = "Central Institute of Conservation, Belgrade",
journal = "Proceedings of Selected Papers and Abstracts of The Third International Students Scientific Conference",
title = "OPTIMAL CHARACTERISTICS OF A SELF-EXPANDING NITINOL STENT UNDER THE ACTION OF ARTERIAL FORCES",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5673"
}

Paunić, M., Jovanović, M.,& Černicin, V.. (2019). OPTIMAL CHARACTERISTICS OF A SELF-EXPANDING NITINOL STENT UNDER THE ACTION OF ARTERIAL FORCES. in Proceedings of Selected Papers and Abstracts of The Third International Students Scientific Conference
Central Institute of Conservation, Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5673

Paunić M, Jovanović M, Černicin V. OPTIMAL CHARACTERISTICS OF A SELF-EXPANDING NITINOL STENT UNDER THE ACTION OF ARTERIAL FORCES. in Proceedings of Selected Papers and Abstracts of The Third International Students Scientific Conference. 2019;.
https://hdl.handle.net/21.15107/rcub_machinery_5673 .

Paunić, Milovan, Jovanović, Miroslav, Černicin, Vladimir, "OPTIMAL CHARACTERISTICS OF A SELF-EXPANDING NITINOL STENT UNDER THE ACTION OF ARTERIAL FORCES" in Proceedings of Selected Papers and Abstracts of The Third International Students Scientific Conference (2019),
https://hdl.handle.net/21.15107/rcub_machinery_5673 .

TY  - CONF
AU  - Černicin, Vladimir
AU  - Milovančević, Uroš
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5050
AB  - Last few decades energy consumption in buildings increases. With a higher population and bigger requirements for comfort, energy needs grow exponentially. Concerning dispensation of the reserves of many energy fuels and energy ineffective work of HVAC systems, their optimization must be done. In such optimization, particular care should be taken not to damage thermal comfort.
In order to promote the improvement of energy efficiency in buildings, for example, the Safe House building in Belgrade was taken. A system of hot-water heating with radiators and a heat pump as an efficient source of heat is designed. Afterward, the energy performances of the building were determined and an analysis of the energy consumption and CO2 emissions was carried out for the implemented system.
PB  - Beograd: SMEITS
C3  - Zbornik 49. Međunarodnog kongresa o KGH
T1  - ENERGY ANALYSIS OF "SAFE HOUSE" BUILDING AND ENERGY IMPROVEMENT BY HEAT PUMP IMPLEMENTATION
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5050
ER  - 

@conference{
author = "Černicin, Vladimir and Milovančević, Uroš",
year = "2018",
abstract = "Last few decades energy consumption in buildings increases. With a higher population and bigger requirements for comfort, energy needs grow exponentially. Concerning dispensation of the reserves of many energy fuels and energy ineffective work of HVAC systems, their optimization must be done. In such optimization, particular care should be taken not to damage thermal comfort.
In order to promote the improvement of energy efficiency in buildings, for example, the Safe House building in Belgrade was taken. A system of hot-water heating with radiators and a heat pump as an efficient source of heat is designed. Afterward, the energy performances of the building were determined and an analysis of the energy consumption and CO2 emissions was carried out for the implemented system.",
publisher = "Beograd: SMEITS",
journal = "Zbornik 49. Međunarodnog kongresa o KGH",
title = "ENERGY ANALYSIS OF "SAFE HOUSE" BUILDING AND ENERGY IMPROVEMENT BY HEAT PUMP IMPLEMENTATION",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5050"
}

Černicin, V.,& Milovančević, U.. (2018). ENERGY ANALYSIS OF "SAFE HOUSE" BUILDING AND ENERGY IMPROVEMENT BY HEAT PUMP IMPLEMENTATION. in Zbornik 49. Međunarodnog kongresa o KGH
Beograd: SMEITS..
https://hdl.handle.net/21.15107/rcub_machinery_5050

Černicin V, Milovančević U. ENERGY ANALYSIS OF "SAFE HOUSE" BUILDING AND ENERGY IMPROVEMENT BY HEAT PUMP IMPLEMENTATION. in Zbornik 49. Međunarodnog kongresa o KGH. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_5050 .

Černicin, Vladimir, Milovančević, Uroš, "ENERGY ANALYSIS OF "SAFE HOUSE" BUILDING AND ENERGY IMPROVEMENT BY HEAT PUMP IMPLEMENTATION" in Zbornik 49. Međunarodnog kongresa o KGH (2018),
https://hdl.handle.net/21.15107/rcub_machinery_5050 .