Numerical Simulation On The Natural Convection Cooling Of PV Module And Hybrid PV/T Solar System

Solar is a new type of clean renewable energy with a wealth of reserves and environmental protection,photovoltaic and thermal output is the main aspects of the use of solar energy.Photovoltaic technology is an important way of the use of electric about solar energy.Temperature is one of the major factors in the impact of solar cell's photovoltaic efficiency.It is necessary to consider the control of solar cell's temperature in the design of solar photovoltaic systems.At the same time the heat that is removed by air in the gap can be used with the electricity, so hybrid PV/T solar technology is a promising way of solar energy.A numerical model of the natural convection cooling system is built for the simulation of the solar cell's temperature,we makes the numerical solution with mathematical software matlab and simulates the performance of cooling fluid flow with CFD software Fluent,and three hybrid PV/T solar systems are built to analyse the photovoltaic and thermal performance of systems.First of all,a numerical model is built to study the performance of the cooling system with the different factors in the thermal environment of the architectural.Analysis shows that the solar radiation,wind speed and environmental temperature is the major factors in the control of the solar cell's temperature;the suitable environment velocity,the optimum length of module and the width of air gap can have a positive effect on the cooling of the solar system.Secondly,a physical model of the ventilation system is built,and we simulate the performance of the cooling fluid flow with CFD software Fluent combined with the temperature of PV module's backplane.The results show that a reasonable analysis and full understanding of the performance of the cooling fluid flow has a practical guide and reference value in the establishment of appropriate solar cooling system.Thirdly,three mathematical models of hybrid PV/T solar systems are built to optimize the photovoltaic and thermal performance of systems. Research shows that the system with single-flow air gap is more beneficial for the cooling of the PV module than the system with the double-flow air gaps and circulative-flow air gap when the length of the module is more than 1.90m;the system with single-flow air gap can generate more power than the system with double-flow air gaps and the system with circulative-flow air gap in the same state of solar radiation; the photovoltaic and thermal output of the system with double-flow air gaps is more than that of the system with single-flow air gap and the system with circulative-flow air gap;The rules of the photovoltaic and thermal performance of hybrid PV/T solar systems can be gained through comparisons in the certain condition about the wind speed of ambient and the length of PV module.