The Simulation Analysis Of The Air Thermal Characteristics Bewteen Photovoltaic Panels And Wall

With the increasing shortage of fossil fuels and a series of social and environmental problems have become increasingly prominent,more and more countries extremely pay attention to the development and application of renewable energy.Photovoltaic facade system has become an important application of solar energy optic-electro and optic-thermal composite utilization system.The photovoltaic facade system not only provides the green electricity for the construction,but also blocks the sunshine,separate the heat to reducing the construction energy consumption in summer.In transitional season,fresh air can be preheated;hot airs between Photovoltaic facade units and the walls separate the heat to reducing indoor heat load in winter.The paper describes the characteristics and principles of optic-electro and optic-thermal composite utilization system,analyzes the domestic and international development and utilization in solar energy optic-electro and optic-thermal composite utilization system.In this paper,with the principle of CFD numerical simulation,applies Fluent software calculate the hot environment of structural hot aisle in Shenyang,researches the distribution of airflow,temperature field and velocity field,basing on the 24-hour cycle fluctuations case about outdoor temperature and solar radiation intensity.In summer,the outdoor air into the hot aisle with the temperature increase of 12 ? around,this part of the heat can be effectively utilized,such as domestic water heating;in winter,through the inner loop,the indoor air into the hot aisle,receiving solar radiation energy,the temperature can be increased about 8.5 ?,the air may be preheated.However,due to the unstable weather conditions in winter,the heat gained limited,the need for other forms of the auxiliary heat source;In transitional season,run for blowing,outdoor air into the hot aisle to accept the energy of solar radiation,air temperature increased about 9.9 ?,and then enter the room,can not only provide fresh air also improve the indoor thermal environment.In general,hot aisle air temperature is mainly affected by solar radiation.Distance between the inner surfaces of the outer unit of Photovoltaic facades closer,the higher the temperature of the air.Then with the increase in the depth direction,the temperature of the air inside the wall will sharply decline,final gradually leveling off.The data obtained in this paper can provide a reference for the installation of the a-Si solar cells applied in BIPV and a method for the utilization of the waste heat,which can improve the comprehensive utility efficiency of PV system.