On the Consideration of Total Efficiency of Photovoltaic/Thermal Panel

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  • On the Consideration of Total Efficienc

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One of the most effective methods for utilizing solar energy is to use the sunshine and the solar thermal energy simultaneously. For this purpose, various kinds of photovoltaic-thermal panel (PV/T panel) which include both PV cells and solar collectors were constructed.<br> In this study, we evaluate the photovoltaic and the solar thermal energy of a PV/T panel in terms of exergy. The solar collector has the maximum exergy temperature desirable to be operated. However, the PV cell conversion efficiency decreases at the temperature because of the increase of the cell temperature by the heat of the collector. Therefore, cooling of the PV cell is important to use the cell under favorable condition.<br> On the basis of the exergy evaluation for the PV/T panel, we propose a new construction of a PV/T panel and discuss the cooling of the PV/T panel by natural convection induced by buoyancy effect. By this cooling effect, the PV cell conversion efficiency is not decreased, while the collector is operated at the maximum exergy temperature. As a result, the proptosed panel would be a significant improvement in the utilization of solar energy.

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