空气流道尺寸对PV-Trombe墙系统性能影响的实验及模拟研究
Experimental and simulation study on influence of air flow channel size on performance of PV-Trombe wall systems
摘要：
将光伏电池与玻璃盖板结合,构建了PV-Trombe墙系统实验台,进行夏季运行测试,得到了系统发电功率与电效率。建立了非稳态传热和发电数学模型,用实验数据验证了模型。分析了空气流道高度、宽度和厚度对PV-Trombe墙系统性能的影响。结果表明:流道高度从0.75 m增至2.00 m时,系统得热功率线性增长1.6倍,而发电功率仅下降4.43%,推荐流道高度为2.00 m,以平衡电热效率;流道宽度增大导致室内温度升高,但增温速率在宽度过大时会减缓,推荐流道宽度控制在0.8～1.2 m,以实现室内温度提升与通风效率的最佳平衡;流道厚度增大导致室内温度下降和电效率上升,但流道过厚会影响热性能,推荐流道厚度为0.13 m,以平衡电热效率。
Abstract：
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.
Keywords:PV-Trombe wall; air flow channel size; photovoltaic cell; power generation power; heat gain power; temperature; solar energy