Abstract
Previous studies on the photovoltaic-thermoelectric (PV-TE) system have focused on its daytime performance, that is, photovoltaic (PV) and thermoelectric generators (TE) only output electricity by day. Consequently, in this paper, a PV-TE system with micro-channel heat pipe (MCHP) and phase change material (PCM) (the PV-MCHP-TE system with PCM) is proposed, and the performance change of the system in 24 h is investigated, which is not involved in earlier researches. Where, PCM on one hand reduces the operating temperature so improves the PV performance in the daytime, and on the other, releases the stored heat to TE at night, which offers a prerequisite for TE to generate power in the nighttime. The mathematical model of the novel system is given out, and its all-day performance is compared with the system without PCM. Theoretical investigations find that PCM improves the overall electrical performance, both in the daytime and the nighttime, with their all-day total outputs of 2.67 × 103 kJ and 2.64 × 103 kJ, respectively, under certain conditions. Additionally, the performance of the two systems under different parameters is further explored, which points out the direction for the following research and also provides valued references for the implementation of integration to PV and TE.
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