Research On The Interaction Between Solar Photovoltaic Systems And Building Wall

In recent years, the environmental issues and energy depletion are becomingmore and more serious. The proportion of building energy consumption in the socialtotal energy consumption is rising year by year with the continuously developing ofurban construction around the world. How to use clean and renewable energy sourcesto reduce building energy consumption to become the focus of attention. Thetechnology of Building Integrated Photovoltaic (BIPV) successfully reduce thebuilding energy consumption through photovoltaic generation providing electricity.The back heat generated by photovoltaic modules working would break the energybalance of the original maintenance structure while the solar photovoltaic modulescombining with building walls. This thesis relied on the project of “the research anddemonstration of low-carbon key technology along the highway facilities in coldregions ". It was mainly about the change of thermal stress of walls, indoor thermalenvironment and the impact of power generation efficiency of photovoltaic systemson different building walls.It was mainly about the impact of their work performance due to differentthermal properties of the wall material when photovoltaic modules were applied to intwo different building external wall（reinforced concrete and clay brick wall）. Thephotoelectric conversion efficiency, average efficiency and etc. of PV modules in twowalls were evaluated by experimental method. It obtained that the photoelectricconversion efficiency of the PV modules on reinforced concrete wall was4.8%higherthan it on the clay brick wall in summer.Through a combination of experiment and finite element simulation, it wasmainly about the effects of photovoltaic system on the temperature and thermal stressof reinforced concrete wall. It can conclude that though the opaque PV module lowingthe internal temperature of wall, average decrease of0.58℃,. the thermal stress alongthe width direction of back wall was increased and the time of tensile stress wasextended due to the change of the temperature distribution in the wall. It averageincreased1.1-1.4times and prolonged2-4hours which was not good for structure andmay low the performance of the normal use of the structure.The simulation of year-round indoor thermal environment of a building intended to be applied photovoltaic technology, it concluded the natural indoor temperaturedistribution of winter and summer of the typical room and annual load of the building.It obtained that saving the annual airconditioning energy dissipation25%because ofthe PV modules. Analysis the thermal stress of the south facade wall of the building inthe use of solar photovoltaic technology.