The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform
Yeong-ley Tsay - One of the best experts on this subject based on the ideXlab platform.
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Heat transfer from block heat sources mounted on the Wall of a 3D Cabinet to an ambient natural convective air stream
Numerical Heat Transfer Part A-applications, 2015Co-Authors: Jen-chieh Cheng, Yeong-ley Tsay, Zai-de ChanAbstract:ABSTRACTIn this study the physical system under consideration is a three-dimensional (3D) Cabinet with arrays of block heat sources mounted on one of the Walls of the Cabinet. The block heat sources dissipate heat to the surrounding Cabinet through conjugate conduction and natural convection. The results illustrate that the difference in hot spot temperature (θH) for situations with and without consideration of thermal interaction between the system and its surrounding area is higher for smaller Rayleigh number (Ra), and can be up to 94.73% with Ra = 105. In addition, heat transfer characteristics depend strongly on the dimensionless heat conductivity of the Cabinet Wall (Kwf), heat conductivity of the block (Kbf), and length of Cabinet (Cx). The maximum reduction in θH is 70.01% when Kwf varies from 10 to 1,000, 12.7% for 10 ≦ Kbf ≦ 1,000, and 30.07% for 0.5 ≦ Cx ≦ 1. The variation in hot spot temperature of blocks is not sensitive to Cabinet angle (Φ).
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Characteristics and Enhancement of Heat Transportation From a Block Heat Source Module in Three-Dimensional Cabinets to an Ambient Natural Convective Air Stream
Numerical Heat Transfer Part A-applications, 2012Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Z. P. ChiuAbstract:This study aims to numerically investigate the natural convective heat transfer characteristics and cooling performance enhancement for a module comprised of a board and arrays of discrete heat generating blocks in three-dimensional Cabinets. The objective of this study has three aspects. First, efforts are performed to investigate the influence of thermal interaction between the air streams inside and outside the Cabinet on the natural convective heat transfer characteristics for the heat source module. Second, attention is given to investigate the cooling performance enhancement of the module by installing plate fins onto the back surface of board. Finally, the cooling performance enhancement of the module by constructing air vents in the Cabinet Wall is conducted. The computation domain covers the Cabinet and surrounding area, so that the temperature and velocity fields of the Cabinet and surrounding are solved simultaneously. The results show that the maximum difference in hot spot temperatures of the...
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Characteristics of heat dissipation from photovoltaic cells on the bottom Wall of a horizontal Cabinet to ambient natural convective air stream
Energy, 2011Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, H.f. Hong, Z.h. ShihAbstract:This study proposes a model to investigate the behaviors of natural convective cooling of photovoltaic cells mounted discretely on the bottom Wall of a horizontal Cabinet. The effects of Rayleigh number (Ra), dimensionless length of Cabinet (Cx), ratio of Cabinet Wall to air thermal conductivities (Kef), number of photovoltaic cells (N), emissivity of metal Wall (ee), and emissivity of glass lens (eg) are explored. Furthermore, the importance of thermal interaction between air streams inside and outside the Cabinet through conducting Wall are examined. The numerical computation domain covers the Cabinet and surrounding area, so that the temperature and velocity fields of the combined regions are solved simultaneously. Results show that temperature differences among the photovoltaic cells can be up to 28% for all the investigated cases when 106 ≦ Ra ≦ 108, 5 ≦ Cx ≦ 12.5, 4 ≦ N ≦ 10, 1000 ≦ Kef ≦ 6300, 0 ≦ ee ≦ 0.5 and 0 ≦ eg ≦ 0.94. The maximum difference in hot spot temperatures of photovoltaic cells is about 26% among the cases with various Kef. In addition, the temperatures are rather low for the situation without consideration of thermal interaction between the air streams inside and outside the Cabinet. Therefore, without the consideration of the thermal interaction would cause serious under-prediction for the hot spot temperatures of photovoltaic cells in engineering applications.
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Natural convective characteristics of a heat source module at different angles in the closed and ventilated Cabinets
International Communications in Heat and Mass Transfer, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:Abstract A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, K bf = K wf = 100, 0 ≦ K pf ≦ 100, 10 5 ≦ Ra ≦ 10 7 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on the Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 17% for closed Cabinet, and 10% for ventilated Cabinet. In addition, the hot spot temperatures for cases with K pf = 10 are about two times of that for K pf = 100.
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Natural Convective Characteristics of an Oblique Heat Source Module in the Closed and Ventilated Cabinets
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis Volume 2, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Results show that the thermal interaction between the airs inside and outside the Cabinet, the module angle and vent position can significantly affect the transfer characteristics. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, Kbf = Kpf = Kwf = 100, 105 ≦ Ra ≦ 107 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 15% for closed Cabinet, and 10% for ventilated Cabinet.
Jen-chieh Cheng - One of the best experts on this subject based on the ideXlab platform.
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Heat transfer from block heat sources mounted on the Wall of a 3D Cabinet to an ambient natural convective air stream
Numerical Heat Transfer Part A-applications, 2015Co-Authors: Jen-chieh Cheng, Yeong-ley Tsay, Zai-de ChanAbstract:ABSTRACTIn this study the physical system under consideration is a three-dimensional (3D) Cabinet with arrays of block heat sources mounted on one of the Walls of the Cabinet. The block heat sources dissipate heat to the surrounding Cabinet through conjugate conduction and natural convection. The results illustrate that the difference in hot spot temperature (θH) for situations with and without consideration of thermal interaction between the system and its surrounding area is higher for smaller Rayleigh number (Ra), and can be up to 94.73% with Ra = 105. In addition, heat transfer characteristics depend strongly on the dimensionless heat conductivity of the Cabinet Wall (Kwf), heat conductivity of the block (Kbf), and length of Cabinet (Cx). The maximum reduction in θH is 70.01% when Kwf varies from 10 to 1,000, 12.7% for 10 ≦ Kbf ≦ 1,000, and 30.07% for 0.5 ≦ Cx ≦ 1. The variation in hot spot temperature of blocks is not sensitive to Cabinet angle (Φ).
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Characteristics and Enhancement of Heat Transportation From a Block Heat Source Module in Three-Dimensional Cabinets to an Ambient Natural Convective Air Stream
Numerical Heat Transfer Part A-applications, 2012Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Z. P. ChiuAbstract:This study aims to numerically investigate the natural convective heat transfer characteristics and cooling performance enhancement for a module comprised of a board and arrays of discrete heat generating blocks in three-dimensional Cabinets. The objective of this study has three aspects. First, efforts are performed to investigate the influence of thermal interaction between the air streams inside and outside the Cabinet on the natural convective heat transfer characteristics for the heat source module. Second, attention is given to investigate the cooling performance enhancement of the module by installing plate fins onto the back surface of board. Finally, the cooling performance enhancement of the module by constructing air vents in the Cabinet Wall is conducted. The computation domain covers the Cabinet and surrounding area, so that the temperature and velocity fields of the Cabinet and surrounding are solved simultaneously. The results show that the maximum difference in hot spot temperatures of the...
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Characteristics of heat dissipation from photovoltaic cells on the bottom Wall of a horizontal Cabinet to ambient natural convective air stream
Energy, 2011Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, H.f. Hong, Z.h. ShihAbstract:This study proposes a model to investigate the behaviors of natural convective cooling of photovoltaic cells mounted discretely on the bottom Wall of a horizontal Cabinet. The effects of Rayleigh number (Ra), dimensionless length of Cabinet (Cx), ratio of Cabinet Wall to air thermal conductivities (Kef), number of photovoltaic cells (N), emissivity of metal Wall (ee), and emissivity of glass lens (eg) are explored. Furthermore, the importance of thermal interaction between air streams inside and outside the Cabinet through conducting Wall are examined. The numerical computation domain covers the Cabinet and surrounding area, so that the temperature and velocity fields of the combined regions are solved simultaneously. Results show that temperature differences among the photovoltaic cells can be up to 28% for all the investigated cases when 106 ≦ Ra ≦ 108, 5 ≦ Cx ≦ 12.5, 4 ≦ N ≦ 10, 1000 ≦ Kef ≦ 6300, 0 ≦ ee ≦ 0.5 and 0 ≦ eg ≦ 0.94. The maximum difference in hot spot temperatures of photovoltaic cells is about 26% among the cases with various Kef. In addition, the temperatures are rather low for the situation without consideration of thermal interaction between the air streams inside and outside the Cabinet. Therefore, without the consideration of the thermal interaction would cause serious under-prediction for the hot spot temperatures of photovoltaic cells in engineering applications.
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Natural convective characteristics of a heat source module at different angles in the closed and ventilated Cabinets
International Communications in Heat and Mass Transfer, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:Abstract A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, K bf = K wf = 100, 0 ≦ K pf ≦ 100, 10 5 ≦ Ra ≦ 10 7 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on the Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 17% for closed Cabinet, and 10% for ventilated Cabinet. In addition, the hot spot temperatures for cases with K pf = 10 are about two times of that for K pf = 100.
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Natural Convective Characteristics of an Oblique Heat Source Module in the Closed and Ventilated Cabinets
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis Volume 2, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Results show that the thermal interaction between the airs inside and outside the Cabinet, the module angle and vent position can significantly affect the transfer characteristics. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, Kbf = Kpf = Kwf = 100, 105 ≦ Ra ≦ 107 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 15% for closed Cabinet, and 10% for ventilated Cabinet.
Yong-lin Zhuang - One of the best experts on this subject based on the ideXlab platform.
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Natural convective characteristics of a heat source module at different angles in the closed and ventilated Cabinets
International Communications in Heat and Mass Transfer, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:Abstract A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, K bf = K wf = 100, 0 ≦ K pf ≦ 100, 10 5 ≦ Ra ≦ 10 7 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on the Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 17% for closed Cabinet, and 10% for ventilated Cabinet. In addition, the hot spot temperatures for cases with K pf = 10 are about two times of that for K pf = 100.
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Natural Convective Characteristics of an Oblique Heat Source Module in the Closed and Ventilated Cabinets
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis Volume 2, 2010Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Yong-lin ZhuangAbstract:A numerical analysis is performed to study the characteristics of heat transfer from a block heat source module at different angles in two-dimensional Cabinets. Great efforts are carried out to conduct the effects of thermal interaction between the air steams inside and outside the Cabinet on the conjugate conduction–natural convection phenomena. Moreover, the enhancement of cooling performance of the heat source module through the construction of air vents on Cabinet Wall is rigorously examined. The computation domain covers the Cabinet and the surrounding area, and the temperature and velocity fields of the Cabinet and surrounding area are solved simultaneously. Results show that the thermal interaction between the airs inside and outside the Cabinet, the module angle and vent position can significantly affect the transfer characteristics. Comparing the results for cases with and without the consideration of thermal interaction between the air streams, the difference in hot spot temperature of module can be up to 26% for Pr = 0.7, Kbf = Kpf = Kwf = 100, 105 ≦ Ra ≦ 107 and φ = 0°, 90°, 270°. The maximum reduction in hot spot temperature is about 41% when two air vents are constructed on Cabinet Wall. The variation of module angle results in the maximum difference of the hot spot temperature is 15% for closed Cabinet, and 10% for ventilated Cabinet.
Z. P. Chiu - One of the best experts on this subject based on the ideXlab platform.
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Characteristics and Enhancement of Heat Transportation From a Block Heat Source Module in Three-Dimensional Cabinets to an Ambient Natural Convective Air Stream
Numerical Heat Transfer Part A-applications, 2012Co-Authors: Yeong-ley Tsay, Jen-chieh Cheng, Z. P. ChiuAbstract:This study aims to numerically investigate the natural convective heat transfer characteristics and cooling performance enhancement for a module comprised of a board and arrays of discrete heat generating blocks in three-dimensional Cabinets. The objective of this study has three aspects. First, efforts are performed to investigate the influence of thermal interaction between the air streams inside and outside the Cabinet on the natural convective heat transfer characteristics for the heat source module. Second, attention is given to investigate the cooling performance enhancement of the module by installing plate fins onto the back surface of board. Finally, the cooling performance enhancement of the module by constructing air vents in the Cabinet Wall is conducted. The computation domain covers the Cabinet and surrounding area, so that the temperature and velocity fields of the Cabinet and surrounding are solved simultaneously. The results show that the maximum difference in hot spot temperatures of the...
Zai-de Chan - One of the best experts on this subject based on the ideXlab platform.
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Heat transfer from block heat sources mounted on the Wall of a 3D Cabinet to an ambient natural convective air stream
Numerical Heat Transfer Part A-applications, 2015Co-Authors: Jen-chieh Cheng, Yeong-ley Tsay, Zai-de ChanAbstract:ABSTRACTIn this study the physical system under consideration is a three-dimensional (3D) Cabinet with arrays of block heat sources mounted on one of the Walls of the Cabinet. The block heat sources dissipate heat to the surrounding Cabinet through conjugate conduction and natural convection. The results illustrate that the difference in hot spot temperature (θH) for situations with and without consideration of thermal interaction between the system and its surrounding area is higher for smaller Rayleigh number (Ra), and can be up to 94.73% with Ra = 105. In addition, heat transfer characteristics depend strongly on the dimensionless heat conductivity of the Cabinet Wall (Kwf), heat conductivity of the block (Kbf), and length of Cabinet (Cx). The maximum reduction in θH is 70.01% when Kwf varies from 10 to 1,000, 12.7% for 10 ≦ Kbf ≦ 1,000, and 30.07% for 0.5 ≦ Cx ≦ 1. The variation in hot spot temperature of blocks is not sensitive to Cabinet angle (Φ).
