Energy Conservation For External Window Of Residential Building In Guangzhou

As a typical Hot Summer and Warm Winter Zone city located in semitropics, Guangzhou has a great many air-conditioners in residential buildings, the application of which is widespread. As hot days of summer last for a long time in the region, energy consumption of air-conditioning in residential buildings is very high. It's known that electricity consumption from air-conditioners during peak time in summer has taken up approximately 30% of the whole city's electric network load. Since 59.4% percent of air-conditioning-related energy consumption comes into being through external windows, it is of great significance to conduct research on energy conservation for external windows.This thesis, with a teachers'apartment of an university in Guangzhou as research object, first studies the impact of factors such as orientation of external windows, window types, sun shading, natural ventilation on air-conditioning-related energy consumption and indoor thermal environment by means of simulation analysis and field tests, and then draws four conclusions about energy conservation of external windows in the region's residential buildings as follows.Through analyses by means of DeST-h dynamic energy simulation software, some results are obtained as follows: 1) Air-conditioning energy consumption from east-facing windows was higher than that from south-facing ones and that from north-facing ones by 23.5% and 18.5% respectively, while energy consumption from west-facing windows was higher than that from south-facing ones and that from north-facing ones by 23.9% and 18.5% respectively. Furthermore, such energy consumption grows linearly with the increase of area ratio of window to wall. 2) In Guangzhou region, shading coefficient has a more conspicuous impact on air-conditioning-related energy consumption than heat transfer coefficient, and the use of 6mm-thick low transmittance heat reflecting glass can save energy by 45.5% in comparison with 6mm-thick ordinary glass. 3) Light curtains for interior shading can reduce energy consumption by 15.8%,Using horizontal sun-shading board with an outrigger coefficient of 0.5 can lead to an energy-saving rate of 23.6%. 4) When windows were opened for ventilation 10 times per hour, the best energy conservation effect can be achieved, with energy consumption lower by 26% than that when windows were closed. By conducting field tests on energy conservation related to external windows of the apartment, it was found that the impacts of the above-mentioned factors on indoor thermal environment were consistent with those drawn from simulation analyses. The study have certain reference value for energy conservation design for external window of residential building in GuangZhou.