Enhancing photovoltaic panel efficiency using porous materials under controlled thermal reduction
摘要
Photovoltaic (PV) panels represent the critical components of sustainable energy system, and their performance is seriously threatened by thermal stresses originating from high temperature. Active cooling, forced water or air in order to be used as porous media have been proposed for potential applications, natural occurring porous materials has seldomly been studied with respect of its potential use for low-cost sustainability. The present study bridges this lead by investigating the natural made porous materials (i.e., gravel) for cooling to be applied on photovoltaic panels concentrating on both thermal and electrical performances. Differing from previous studies dealing with nanofluid or synthetic foam as the wetting agent, our experimental design takes place of all combinations of unified water flow rate (1, 1.5 and 2 L/min) with diverse gravel porosities (0.14, 0.19 and 0.25) to deliver a general assessment under consistent system setup for comparison. This experiment demonstrates that a gravel-based passive cooling has potential to lower the surface temperature by 43%(at porosity of 0.25) with an additional power output of up to 17watts as compared to uncoupled systems (i.e., from 30 W watts − 47 W). The results describe the remarkable performance (in thermal and electrical) of this natural material, providing a simple cost-effective alternative to complicated cooling procedures. This article offers some new evidences for the combined effects of porosity and flow rate on PV cooling, which may be beneficial for future regions where advanced cooling approaches are still emerging. The possibility of scalability of this system for larger PV plants and its hybrid use with phase change material (PCM) based cooling is being investigated.