Abstract
A pin fins array as a heat sink along with a moist wood wool pad to serve as novel cooling system to cool PV panel has been used. The present cooling system was based on the evaporative cooling concept and extended area of heat transfer. The results gave enhancements in output power and panel’s efficiency about 32.7% and 31.5% respectively. This improvement in the module performance was attributed to the reduction in the operation temperature of the solar cell. The reduction in module temperature was about 26.05%.
Highlights
Photovoltaic cell performance influences by its temperature in a negative manner due to the negative coefficient of temperature of crystalline silicon [1].It had been estimated that the temperature coefficient about -0.4 to -0.5 % K-1
The effects of the fin length on the heat sink thermal performance were studied as seen in Figure (4, 5 and 6).Usually, the increasing in the fin height will improve the thermal dissipation as well as the effectiveness as shown in Figure (4and 5).And, with fin length increasing from 3cm to 7 cm
5- Conclusion: A passive cooling system of a wood wool along with heat sink structures isinvested for standalone PV modules to minimize its the temperature, to increase the module output power and increasing the efficiencyas well as reducing the thermal degradation rate for the PV panel
Summary
Photovoltaic cell performance influences by its temperature in a negative manner due to the negative coefficient of temperature of crystalline silicon [1].It had been estimated that the temperature coefficient about -0.4 to -0.5 % K-1 This leads to a decrease the cell's efficiency, which is typically about 15% under a standard test condition (at temperature of 25°C and irradiance of 1000 w/m2), [2]. They took advantage of from the heat of liquid evaporation as in Ref [6] They had been developed a simple passive cooling system using cotton wick structures at the rear side of PV module. Hasan et al [8] investigated a passive cooling system by attaching a cellulose pad at the rear surface of photovoltaic panel and maintained wet condition by flowing drops of water through cellulose pad. The evaporation of water from the wet surface (pad) caused a significant effect in the PV panel performance
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