ENERGY CONSERVATION OF WINDOW SYSTEMS IN RESIDENTIAL BUILDINGS OF HOT SUMMER AND COLD WINTER ZONE IN CHINA

Heat gain through the exterior window accounts for 25-28% of the total heat gain, adding to theinfiltration, it is up to 40 % in hot summer and cold winter zone of china, so it is important to carry outthe sustainable window systems design with low energy consumption. The effects of window systemsincluding area ratio of window to wall and categories of glazing on energy consumption of airconditioner (AC) are simulated by using eQUEST software. Results show that west and east windowshave more obvious effect on decreasing the AC annual electric consumption, low-e glazing (both singleglazing and double glazing) has obvious effect on the energy conservation of heating electricconsumption and reflective glazing shows the better effect on the reduction of cooling electricconsumption. The limit values of glazing heat-transfer coefficient with different glazing shadingcoefficients and area ratios of window to wall in hot summer and cold winter zone in china aresuggested. All the results can be the reference of revising Residential Building Energy ConservationDesign Standard of Hot Summer and Cold Winter Zone in China (JGJ 134-2001) and window designingfor residential buildings.