TY  - JOUR
AU  - Vasić, Mihailo
AU  - Stevanović, Vladimir
AU  - Zivković, Branislav
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3402
AB  - The main purpose of ventilation system is to meet the requirements of thermal comfort and air quality for the occupants. HVAC designers select air supply devices by using manufacturers' data, under the assumption that the outflow from the elements is uniform and radially symmetric. Uniformity and symmetry hold only if air velocity vectors have uniform intensities and directions that are perpendicular to the diffuser inlet cross section. Unfortunately, these conditions are hardly met in the engineering practice. The most common case of diffuser installation is the flush ceiling installation, accompanied with the plenum box with side entry above the ceiling. Therefore, in the present article investigated is the influence of different geometries of the equalizing elements in the plenum box with the side entry connection on the symmetry of the jet and the flow distribution through the four-sided square ceiling diffuser. New designs of the plenum box with an inclined non-uniformly perforated plate and with an equalizing element with air guidance blades are proposed and evaluated numerically and experimentally. A better uniformity of the air discharge from the diffuser outlet to the ventilated room is achieved.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Science and Technology For The Built Environment
T1  - Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry
EP  - 686
IS  - 5
SP  - 676
VL  - 26
DO  - 10.1080/23744731.2020.1730124
ER  - 

@article{
author = "Vasić, Mihailo and Stevanović, Vladimir and Zivković, Branislav",
year = "2020",
abstract = "The main purpose of ventilation system is to meet the requirements of thermal comfort and air quality for the occupants. HVAC designers select air supply devices by using manufacturers' data, under the assumption that the outflow from the elements is uniform and radially symmetric. Uniformity and symmetry hold only if air velocity vectors have uniform intensities and directions that are perpendicular to the diffuser inlet cross section. Unfortunately, these conditions are hardly met in the engineering practice. The most common case of diffuser installation is the flush ceiling installation, accompanied with the plenum box with side entry above the ceiling. Therefore, in the present article investigated is the influence of different geometries of the equalizing elements in the plenum box with the side entry connection on the symmetry of the jet and the flow distribution through the four-sided square ceiling diffuser. New designs of the plenum box with an inclined non-uniformly perforated plate and with an equalizing element with air guidance blades are proposed and evaluated numerically and experimentally. A better uniformity of the air discharge from the diffuser outlet to the ventilated room is achieved.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Science and Technology For The Built Environment",
title = "Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry",
pages = "686-676",
number = "5",
volume = "26",
doi = "10.1080/23744731.2020.1730124"
}

Vasić, M., Stevanović, V.,& Zivković, B.. (2020). Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry. in Science and Technology For The Built Environment
Taylor & Francis Inc, Philadelphia., 26(5), 676-686.
https://doi.org/10.1080/23744731.2020.1730124

Vasić M, Stevanović V, Zivković B. Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry. in Science and Technology For The Built Environment. 2020;26(5):676-686.
doi:10.1080/23744731.2020.1730124 .

Vasić, Mihailo, Stevanović, Vladimir, Zivković, Branislav, "Uniformity of air flow from the ceiling diffuser by an advanced design of the equalizing element in the plenum box with side entry" in Science and Technology For The Built Environment, 26, no. 5 (2020):676-686,
https://doi.org/10.1080/23744731.2020.1730124 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Zivković, Branislav
AU  - Milivojević, Sanja
AU  - Maslovarić, Blaženka
AU  - Karamarković, Vladan
AU  - Trkulja, Vojin
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/986
AB  - A prediction of thermal transients in district heating systems is important in order to adjust in an energy efficient manner the loads of heat power plants and pump stations with dynamic consumption needs during changes of the outside air temperature, the wind intensity, the solar radiation, or system start-ups and shut-downs. A model and corresponding computer code are developed with the aim to simulate the thermal transients in district heating systems. They are based on the high-order accurate numerical solution of the transient energy equation, and the hydraulic prediction of pressure and fluid flow rates within the complex pipe network. Thermal transients caused by an increase and decrease of the heat power plant load are simulated for real operating conditions of the district heating system. Predicted temperature front propagations show a good agreement with data measured at three consumer substations located in different parts of the district heating network and at different distances from the heat plant. The developed computational tool provides reliable information about time periods of temperature fronts propagation and heat distribution from the heat source to consumers within the whole district heating network.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy Conversion and Management
T1  - Prediction of thermal transients in district heating systems
EP  - 2173
IS  - 9
SP  - 2167
VL  - 50
DO  - 10.1016/j.enconman.2009.04.034
ER  - 

@article{
author = "Stevanović, Vladimir and Zivković, Branislav and Milivojević, Sanja and Maslovarić, Blaženka and Karamarković, Vladan and Trkulja, Vojin",
year = "2009",
abstract = "A prediction of thermal transients in district heating systems is important in order to adjust in an energy efficient manner the loads of heat power plants and pump stations with dynamic consumption needs during changes of the outside air temperature, the wind intensity, the solar radiation, or system start-ups and shut-downs. A model and corresponding computer code are developed with the aim to simulate the thermal transients in district heating systems. They are based on the high-order accurate numerical solution of the transient energy equation, and the hydraulic prediction of pressure and fluid flow rates within the complex pipe network. Thermal transients caused by an increase and decrease of the heat power plant load are simulated for real operating conditions of the district heating system. Predicted temperature front propagations show a good agreement with data measured at three consumer substations located in different parts of the district heating network and at different distances from the heat plant. The developed computational tool provides reliable information about time periods of temperature fronts propagation and heat distribution from the heat source to consumers within the whole district heating network.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy Conversion and Management",
title = "Prediction of thermal transients in district heating systems",
pages = "2173-2167",
number = "9",
volume = "50",
doi = "10.1016/j.enconman.2009.04.034"
}

Stevanović, V., Zivković, B., Milivojević, S., Maslovarić, B., Karamarković, V.,& Trkulja, V.. (2009). Prediction of thermal transients in district heating systems. in Energy Conversion and Management
Pergamon-Elsevier Science Ltd, Oxford., 50(9), 2167-2173.
https://doi.org/10.1016/j.enconman.2009.04.034

Stevanović V, Zivković B, Milivojević S, Maslovarić B, Karamarković V, Trkulja V. Prediction of thermal transients in district heating systems. in Energy Conversion and Management. 2009;50(9):2167-2173.
doi:10.1016/j.enconman.2009.04.034 .

Stevanović, Vladimir, Zivković, Branislav, Milivojević, Sanja, Maslovarić, Blaženka, Karamarković, Vladan, Trkulja, Vojin, "Prediction of thermal transients in district heating systems" in Energy Conversion and Management, 50, no. 9 (2009):2167-2173,
https://doi.org/10.1016/j.enconman.2009.04.034 . .

TY  - JOUR
AU  - Stevanović, Vladimir
AU  - Milivojević, Sanja
AU  - Maslovarić, Blaženka
AU  - Zivković, Branislav
AU  - Nikodijević, Srđan
PY  - 2007
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/693
AB  - An efficient method for numerical simulation and analyses of the steady state hydraulics of complex pipeline networks is presented. It is based on the loop model of the network and the method of square roots for solving the system of linear equations. The procedure is presented in the comprehensive mathematical form that could be straightforwardly programmed into a computer code. An application of the method to energy efficiency analyses of a real complex district heating system is demonstrated. The obtained results show a potential for electricity savings in pumps operation. It is shown that the method is considerably more effective than the standard Hardy Cross method still widely used in engineering practice. Because of the ease of implementation and high efficiency, the method presented in this paper is recommended for hydraulic steady state calculations of complex networks.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Energy Conversion and Management
T1  - Efficient numerical method for district heating system hydraulics
EP  - 1543
IS  - 5
SP  - 1536
VL  - 48
DO  - 10.1016/j.enconman.2006.11.018
ER  - 

@article{
author = "Stevanović, Vladimir and Milivojević, Sanja and Maslovarić, Blaženka and Zivković, Branislav and Nikodijević, Srđan",
year = "2007",
abstract = "An efficient method for numerical simulation and analyses of the steady state hydraulics of complex pipeline networks is presented. It is based on the loop model of the network and the method of square roots for solving the system of linear equations. The procedure is presented in the comprehensive mathematical form that could be straightforwardly programmed into a computer code. An application of the method to energy efficiency analyses of a real complex district heating system is demonstrated. The obtained results show a potential for electricity savings in pumps operation. It is shown that the method is considerably more effective than the standard Hardy Cross method still widely used in engineering practice. Because of the ease of implementation and high efficiency, the method presented in this paper is recommended for hydraulic steady state calculations of complex networks.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Energy Conversion and Management",
title = "Efficient numerical method for district heating system hydraulics",
pages = "1543-1536",
number = "5",
volume = "48",
doi = "10.1016/j.enconman.2006.11.018"
}

Stevanović, V., Milivojević, S., Maslovarić, B., Zivković, B.,& Nikodijević, S.. (2007). Efficient numerical method for district heating system hydraulics. in Energy Conversion and Management
Pergamon-Elsevier Science Ltd, Oxford., 48(5), 1536-1543.
https://doi.org/10.1016/j.enconman.2006.11.018

Stevanović V, Milivojević S, Maslovarić B, Zivković B, Nikodijević S. Efficient numerical method for district heating system hydraulics. in Energy Conversion and Management. 2007;48(5):1536-1543.
doi:10.1016/j.enconman.2006.11.018 .

Stevanović, Vladimir, Milivojević, Sanja, Maslovarić, Blaženka, Zivković, Branislav, Nikodijević, Srđan, "Efficient numerical method for district heating system hydraulics" in Energy Conversion and Management, 48, no. 5 (2007):1536-1543,
https://doi.org/10.1016/j.enconman.2006.11.018 . .