Passive cooling of photovoltaic systems through phase change material has been demonstrated as an effective method of improving the electrical efficiency of the systems. PCM can absorb significant quantities of thermal energy while keeping a constant temperature. However, its low thermal conductivity has adversely affected its application in thermal regulation of PV systems. In the present study, four types of nanomaterials were employed to produce nano-enhanced phase change material (NePCM) heat sinks. The effectiveness of the nanomaterials in cooling the PV panels was also evaluated. Moreover, graphene nanoplatelet (GNP), copper oxide (CuO), their physical and chemical mixtures were separately incorporated with Polyethylene Glycol 1500 as the PCM for the first time. Furthermore, the thermal conductivity, melting point, latent heat of fusion, and viscosity of NePCM with different weight fractions of nanomaterials were assessed. The results revealed that, compared with pure PCM, the chemical mixture of GNP-CuO 3 NePCM had the highest thermal conductivity enhancement of 91.81 and the lowest dynamic viscosity increase of 14.83 . In addition, compared with the pure-PCM heat sink, outdoor experimental tests of PV-NePCM systems using a chemical mixture of GNP-CuO 3 wt revealed a reduction of 6.6 degrees C in the temperature of the PV surface and a 3 increment in its electricity generation
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