Enhancing the renewable energy payback period of a photovoltaic power generation system by water flow cooling

A photovoltaic system which enjoys water flow cooling to enhance the performance is considered, and impact of rate variation on energy payback period investigated. The investigation done by developing a mathematical model describe heat transfer fluid flow. poly crytalline PV module with nomical capacity 150 W that located in city Tehran, Iran, chosen as case study. results show incresing rate, EPBP declines first linearly, from inlet 0 0.015 kg.s-1, then, approaches constant value. When there no cooling, 8.88, while applying reaches 6.26 years. However, only 0.28 further years decreament observed when mass becomes kg.s-1. Consequently, an optimum limit for could be defined, point linear trend turns into approaching For this case, indicated, value