Abstract:

In view of the fact that few studies have been involved in dual-fluid composite cooling for PV/T(photovoltaic/thermal) collectors to date, this paper carried out comparative experiments between composite cooling and non-refrigerant cooling through two sets of PV/T module test platforms, which were built to study the performance of this module under different flow conditions. The research data indicated that increasing the mass flow rate of air and water synchronously was conducive to improving the electrothermal performance of the PV/T module, with a maximum integrated efficiency of 84.46%; the surface temperature of the glass plate was obviously stratified under the composite cooling mode, and its electrical efficiency was 16.09% higher than that of the non-refrigerant cooling module. The comparison of the experimental data with the simulation results had verified the credibility of the PV/T numerical model, thus paved the way for further simulation and analysis of how design parameters influence the performance of the PV/T module. The simulation results showed that: only by increasing the mass flow of air or water, the overall thermal efficiency and integrated efficiency of PV/T module were improved; increasing the temperature of the imported working medium reduced the electrothermal efficiency of the module; increasing radiation intensity could effectively boost the comprehensive performance of the module.

Key words: solar energy, photovoltaic/thermal, compound cooling, experimental validation, numerical simulation

摘要：

目前PV/T集热器有关双流体复合冷却的研究还少有涉及，基于此，本文通过搭建两套PV/T模块测试平台开展复合冷却与无工质冷却的对比实验，研究不同流量工况下模块的性能表现。数据表明：同时增大空气与水的质量流量有助于提高PV/T模块的电热性能，综合效率最高可达84.46%；复合冷却模式下玻璃盖板表面温度分层明显，电效率较无工质冷却模块可提升16.09%。通过对比实验数据与模拟结果，验证了PV/T数值模型的可信度，并进一步模拟分析运行参数对PV/T模块工作性能的影响，结果显示：单一地提高空气或水的质量流量，PV/T模块的总热效率、综合性能均得到提升；增大进口工质温度降低了模块的电热性能；而辐照强度的增加能够有效提升模块的综合效率。

关键词: 太阳能, 光伏/光热, 复合冷却, 实验验证, 数值模拟