Abstract

The temperature of a photovoltaic (PV) plate increases with increasing absorbed irradiation, leading to degradation of the electrical efficiency of the PV cells. The heat can be dissipated by air or water to prevent the deterioration of the cells. In this study, a concentrating photovoltaic thermal (PV-T) dual-fluid solar collector is proposed in which two types of concentrators are integrated. The collector’s performance was analysed with air and water as the working fluids. Analytical expressions were derived from the energy balance equations for each component of the collector. The mean temperature values of the PV plate, air inlet/outlet, water inlet/outlet, glaze and collector back wall were experimentally recorded under different fluid mass flow rates and solar irradiations. The readings were then used to compute the thermal and electrical efficiencies of the collector. The results obtained from the numerical and experimental analyses were compared and evaluated by employing the mean absolute percentage error method. The results show that incorporating two fluids increases the thermal and electrical efficiencies. The total thermal and electrical efficiencies achieved are 67.00% and 13.02%, respectively, at air and water mass flow rates of 0.0103 kg/s and 0.0164 kg/s, respectively, and a solar irradiation of 650 Wm⁻². The outcomes of this research are expected to help advance the designs of dual-fluid PV-T solar collectors and offering a broader range of thermal applications.

中文翻译：

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具有反射和折射太阳能聚光器的双流体光伏集热器的性能研究

摘要

光伏（PV）板的温度随着吸收辐射的增加而增加，从而导致PV电池的电效率下降。热量可以通过空气或水消散，以防止电池质量下降。在这项研究中，提出了一种集成两种聚光器的聚光光伏热（PV-T）双流体太阳能集热器。使用空气和水作为工作流体来分析收集器的性能。从收集器每个组件的能量平衡方程式导出了解析表达式。在不同的流体质量流量和太阳辐射下，通过实验记录了PV板，进气口/出气口，进水口/出气口，釉料和集热器后壁的平均温度值。然后将读数用于计算收集器的热效率和电效率。比较了通过数值分析和实验分析获得的结果，并采用平均绝对百分比误差法进行了评估。结果表明，结合两种流体可提高热效率和电效率。在空气和水的质量流量分别为0.0103 kg / s和0.0164 kg / s以及太阳辐射为650 Wm的情况下，实现的总热效率和电效率分别为67.00％和13.02％⁻²。预期这项研究的结果将有助于推进双流体PV-T太阳能集热器的设计，并提供更广泛的热学应用。