Study On Energy Performanxe Of PV Windows

The thermal insulation and air tightness are the main influencing factors of building energy consumption. The heat transfer loss of building envelop accounts for70%～80%of the total building envelop heat loss, and the air infiltration heat loss of door and window gap accounts for20%～30%of the total building envelop heat loss. Because of the functional requirement in daylight and ventilation of the window, that made it become the weak line of thermal insulation and the sum of its heat transfer loss and air infiltration heat loss will accounts for47%of the total building envelop heat loss. So, the energy-saving of window is an important way to decrease energy consumption in building.Compared with common window, photovoltaic window as a new energy-saving window not only has the characteristics of thermal insulation and water tightness, but also can achieve electricity generation. But in the different zones and different orientations the thermal insulation and generated energy of photovoltaic window are different. So, photovoltaic windows were researched in this paper. First, the test measurements were used to verify the thermal, daylighting and PV theoretical models developed via the building simulation software Energy Plus.Then the single clear window(SC), double clear window(DC), single PV window(SPV), double PV window(DPV) and double nature ventilation PV window(NVPV) were taken as object of study. In order to study the energy performance of PV windows in different climate zone, we choose Harbin, Beijing, Shanghai, Shenzhen, and Lhasa which represent severe cold zone, cold zone, hot summer and cold winter zone, hot summer and warm winter zone, and highland zone respectively.5%and10%transmittance PV glasses were chosen to research their energy performance. The validated models were used to simulate the five windows on the different orientations of office building in the five cities and different PV glass transmittance. According to the simulation results, NVPV was the best glazing system for the five cities, and in the five cities south is the best orientations, and compared with5%transmittance PV glass, the energy conservation of10%transmittance PV glass was better.