Supersonically sprayed nanotextured surfaces for cooling solar photovoltaic panels

초록

A polysilicon photovoltaic (PV) solar panel suffers from a drop of approximately 2% in conversion efficiency (eta c) for every 5 degrees C increase in temperature. Because nanotexturing increases the convective heat-transfer coefficient by increasing the total surface area, we nanotextured the rear of a PV panel using nanomaterials via supersonic spray coating to prevent conversion efficiency drops in response to overheating. Nanotexturing alone led to temperature reduction from 61 to 53 degrees C during natural convective cooling in the absence of any external device or energy input, while it dropped from 40 to 35 degrees C during forced convective cooling. The conversion efficiency of the nanotextured PV panel was monitored in both indoor and outdoor environments, both of which revealed that nanotexturing effectively reduced surface temperature and increased conversion efficiency to afford a 7%-15% higher energy yield. As such, the use of a nanotextured surface is a sustainable and passive air-cooling method that does not necessitate the introduction of an external device or additional energy input.

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