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Background Today, one of the concerns is to reduce the efficiency of photovoltaic solar cells as their temperature rises. Therefore, cooling photovoltaic is one of the challenges that will be addressed in this article. In this paper, the cooling of a photovoltaic cell by a newly designed heatsink is numerically investigated. Method Two nanofluids were used to cool the heatsink. The heatsink consists of an Aluminum cover and two main parts in which there are numerous channels with zigzag walls. Moreover, the two-phase mixture method was employed to simulate the nanofluids flow based on finite volume method. The performance of the heatsink and photovoltaic were studied for concentration of the nanoparticles at different Reynolds numbers. Findings Using nanofluids increases the heat transfer coefficient but also increases the required pumping power. By adding 2% alumina at the Reynolds number of 150, the heat transfer coefficient increases by 83%. Furthermore, Al 2 O 3/ H 2 O nanofluids has better thermal resistance and temperature uniformity than CuO / H 2 O nanofluids for heatsink and photovoltaic. The addition of alumina nanoparticles increases the thermal efficiency of photovoltaic while the addition of copper oxide nanoparticles reduces it. Moreover, by increasing the Reynolds number from 50 to 150, the thermal efficiency increased by 7%.
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