Experimental and simulation study on influence of air flow channel size on performance of PV-Trombe wall systems
Chen Hongbing[1][2] Li Chunyang[1][2] Wang Congcong[1][2] Zheng Tingting[3] Zhang Yan[1][2] Liu Yuhang[1][2] Lu Haoyang[1][2]
A PV-Trombe wall system experimental platform is constructed for summer operation tests by combining photovoltaic cells with glass cover plates, and the system’s power generation power and electrical efficiency are obtained. A mathematical model of unsteady heat transfer and power generation is established, and the model is verified with experimental data.The influences of height, width and thickness of the air flow channel on the performance of the PV-Trombe wall system are analysed. The results show that when the height of the flow channel increases from 0.75 m to 2.00 m, the heat gain power of the system increases linearly by 1.6 times, while the power generation power decreases by only 4.43%. The recommended height of the flow channel is 2.00 m to balance electrical and thermal efficiency. The increase in the width of the flow channel leads to an increase in indoor temperature, but the warming rate slows down when the width is too large. The recommended width of the flow channel is between 0.8 and 1.2 m to achieve the best balance between indoor temperature increase and ventilation efficiency. The increase in the thickness of the flow channel will lead to a decrease in indoor temperature and an increase in electrical efficiency, but excessive thickness will affect the thermal performance. The recommended thickness of the flow channel is 0.13 m to balance electrical and thermal efficiency.