Study and analysis the effect of panel rear surface temperature on the photovoltaic system efficiency

Abstract

As the operating temperatures increase, the efficiency of the solar system will be decreases. Therefore, the examination of the mode of transmission and dissipation of the temperature of the solar panel and its impact on the level of electricity generation of the panel has made a significant contribution to determining the solar panel efficiency. In order to reduce the possibility of excessive heating, in particular its upper part, so, leaving a certain air gap between the hatching roof surface and the panel back at which the solar panel can be allowed heat dissipation. The aim of this work is to study and investigate the impact of the solar panel rear surface temperature on its output. The study was performed experimentally on three heights (10, 20 and 30 cm) in 3 positions. The study was first carried out with three identical panels on one height of the roof, then ,the height of the first panel remains unchanged, while,  the other two panels being changed by 20 cm and 30 cm in the woe steps respectively. The results obtained show that the solar panel output level is inversely proportional to the panel rear surface temperature. So, we can conclude that in case of leaving a certain air gap will lead to more dissipation of panel heat which lead to a much increase in the panel output level.