The Research On Exterior Window Energy-saving Of Resident Building In Different Zones Of China

With the rapid development of China's national economy and the growing trend of energy shortage, energy conservation has become an important strategy for sustainable development in China. As an important component of the energy consumption, the strategy for Building energy-saving has no time to delay.Previously there have been many studies on the building energy-saving, but most of them are for public building. The study object of this paper is resident building for its popularity. The resident building wastes a lot of energy due to its structure and function characters. There is great potential in energy conservation in resident building, and the energy-saving of resident building is an important part of the strategy for Building energy-saving.Representative cities have been chosen respectively in cold, hot summer & cold winter and hot summer & warm winter climate zones as study objects in this paper. These cities are Beijing, Changsha and Shenzhen.Various exterior window energy-saving measures in the resident building are evaluated by eQUEST energy simulation software, and its impacts on the air-conditioning energy consumption are discussed deeply. The research contents and results are as follows:(1) By combined simulation, the influence of the performance parameters (heat transfer coefficient, shading coefficient) of window glass on the air-conditioning energy consumption has been studied. It is concluded that the energy conservation of buildings in cold climate zones should focus on the heat transfer of the exterior window. In hot summer & cold winter area the heat transfer coefficient and shading coefficient of window glass should pay attention to simultaneity. While in hot summer & warm winter area the shading coefficient should be reduced as much as possible.(2) The energy conservation potential of several types of exterior windows is studied. It is indicated that the double-clear glass is the most economical one in cold area. Single Low-E glass and double-clear glass suits for hot summer & cold winter area while in hot summer & warm winter area heat radiation glass is the best choice.(3) By combined simulation, the influence of the change of the windows to wall ratio,The suitable ratio of window to wall and the building for the three cities are provided in this paper; (4) The energy consumption for heating increases but for cooling reduces along with the increasing the exterior extending parameter. The influence of shading board hardly affect the yearly energy consumption in hot summer & cold winter area but substaintialy influence the energy consumption in hot summer & warm winter area.The research result of this paper proves that the potential of energy efficiency of exterior windows is great, and it is significative to popularize the energy-saving design of exterior windows.