Solar photovoltaic (PV) and solar thermal systems are most widely used renewable energy technologies. Theoretical study indicates that the energy conversion efficiency of solar photovoltaic gets reduced about 0.3% when its temperature increases by 1°C. In this regard, solar PV and thermal (PVT) hybrid systems could be a solution to draw extra heat from the solar PV panel to improve its performance by reducing its temperature. Here, we have designed a new type of heat exchanger for solar PV and thermal (PVT) hybrid systems and have studied the performance of the system. The PVT system has been investigated in comparison with an identical solar PV panel at outdoor condition at Dhaka, Bangladesh. The experiments show that the average improvement of open circuit voltage (Voc) is 0.97 V and the highest improvement of Voc is 1.3 V. In addition, the overall improvement of output power of solar PV panel is 2.5 W.

中文翻译：

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太阳能光伏热混合系统的新设计提高太阳能光伏性能

太阳能光伏 (PV) 和太阳能热系统是应用最广泛的可再生能源技术。理论研究表明，温度每升高1℃，太阳能光伏的能量转换效率降低0.3%左右。在这方面，太阳能光伏和热 (PVT) 混合系统可能是一种解决方案，可从太阳能光伏电池板吸收额外热量，通过降低其温度来提高其性能。在这里，我们为太阳能光伏和热 (PVT) 混合系统设计了一种新型热交换器，并研究了系统的性能。PVT 系统已在孟加拉国达卡的室外条件下与相同的太阳能光伏电池板进行了比较。实验表明，开路电压（Voc）的平均改善为0.97 V，Voc的最高改善为1.3 V。 此外，