Window Heat Shield Impact On Indoor Thermal Environment

Today, energy problem is serious day by day, and energy-saving has become the hot issue of the world. In China, Building energy consumption has account for more than a quarter of total society energy consumption. Among it, Air conditioning energy consumption which caused by windows have account for a biggish proportion in the whole building energy consumption.For a long time, the window energy-saving research is focus on glasswork, but the glass-curtain combination research is few. On the premise of the indoor luminous rays enough, we can improve the indoor thermal environment greatly by glass-curtains combination, whose solar radiation reflectivity is greatly. So, the energy-consuming is reduced.For the prodigiouss energy-saving potential, we put forward the combination as windows thermal shield system.In this thesis, the windows thermal shield system include glasses and curtains (or window shade), which can obstruct the solar radiation and heat transfer for difference temperature between indoor and outdoor air.So the system can improve indoor thermal environment.The research methods in this thesis are theoretical analysis, testing in spot and computational simulation. Firstly, based on the research of predecessors, theoretic analyze the process of heat transfer difference in indoor and outdoor temperature, especially on the solar radiation which through the windows thermal shield System enter into the room. Influence of penetrability reflectivity and absorptivity on indoor thermal environment. I deduced the equation of thermal exchange through windows thermal shield system.Try an experiment in different orientations and combination of windows thermal shield system in summer and winter. Gain the average temperature hour by hour, reflected intensity of solar radiation different combination by windows thermal shield system and the different orientations average on total intensity of solar radiation during the test. By dynamic testing of the same in orientation but different in combination of windows thermal shield system, in the same with combination of windows thermal shield system but different in orientation, in the same with orientation and glasses in the combination of windows thermal shield system but different in curtain, in the same with orientation and curtain in the combination of windows thermal shield system but different in glasses,etc. We can gain the combination of windows thermal shield system, whose solar radiation reflectivity greatest. We can improve the indoor thermal environment better, and also discovered the temperature of the airtight rooms is higher during the night. The experimental data show that the temperature in the rooms reaches the highest temperature at 9 p.m in summer., but the temperature in winter at 6 p.m.The highest temperature of the rooms is in western, the higher in eastern, and the lowest in southern.Finally, the software of DeST-h was used to simulate the air-condition energy consumption of the buildings with different orientations and windows thermal shield system combinations in Kunming. Analyze the data, it has a good energy-saving effect, if the windows thermal shield system with energy-saving curtain. The experiment indicate the building with sunlight controlling coated glass which thickness is 6 mm and the energy-saving curtain with aluminum-plate, compared it with the normal building with common glass which thickness is 6 mm and no curtain, whose air-condition energy consumption is the lowest, and saving 101.98 kWh. In addition, if the building has the same combination of windows thermal shield system but different orientations, whose air-condition energy consumption also has biggish influential. The lowest energy consumption building is the southern one. The following one is eastern. Nevertheless, the highest energy consumption building is the western one.By the research, we can intuitionist obtained the influence current of indoor on solar radiation reflectivity ability of windows thermal shield system, and the software was used to simulate the influence on air-condition energy consumption of the buildings with different orientations and windows thermal shield system combinations all-year. Accordingly, offering a scientific point of view on windows thermal shield system selecting in summer and the effect of heat preservation, especially on the application of energy-saving curtain.