Journal
ENERGY
Volume 242, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.122546
Keywords
Radiative cooling; Thermoelectric refrigerator (TER); Thermoelectric generator (TEG); Thermal-electrical properties; Atmospheric window
Categories
Funding
- Scientific Research Foundation [2020YB29]
- Teaching Reform and Practice Project of Chongqing University of Technology [KJQN201901144]
- Science and Technology Research Program of Chongqing Municipal Education Commission [cx2021127]
- Chongqing Human Resources and Social Security Bureau [P0014036]
- Chongqing Research Program of Basic Research and Frontier Technology, People's Republic of China
- Hong Kong Polytechnic University
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By combining RC and TER, the temperature span can be significantly improved, leading to better thermal management and power generation performance.
A CP2-127-06 Melcor module is incorporated into a radiative cooling (RC) system to work as a ther-moelectric refrigerator (TER) at daytime and a thermoelectric generator (TEG) in nighttime. Through analysis of the single RC system, only a small temperature span between environment and building can be achieved. However, the temperature span can be significantly improved by combining RC and TER. The TER's input electrical current is optimized to obtain the maximum coefficient of performance (COP) 4.85 and the maximum cooling power density (CPD) 9.64 x 103 W m(-2). Making trade-off between COP and CPD, the optimal regions of the COP, CPD, temperatures of cold side and hot side, and electrical current are determined. Further, the RC-TEG system's maximum power density 5.10 W m(-2) and maximum efficiency 0.369% and the corresponding optimal conditions are obtained. With increasing the area ratio of emitter to TER or TEG, the performances of the systems are firstly improved and then remain almost unchanged. This work may provide guidance for building's thermal management at daytime and power generation in nighttime. (C)& nbsp;2021 Elsevier Ltd. All rights reserved.
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