Analysis Of Non-uniform Energy-saving Structure And Thermal Environment Of Solar Building

At present, the global energy form is grim, and our solar energy is rich in resources, and the development and utilization of solar energy is of great practical significance to the sustainable development of our country, especially for building energy saving. Solar buildings can effectively use solar energy to reduce building energy consumption, while also by optimizing the solar building structure to improve the indoor thermal environment.Solar building is affected by the intensity of outdoor solar radiation, solar radiation intensity is different in different regions, and solar radiation by the sun azimuth and solar elevation angle, so the envelope of comprehensive temperature of outdoors and orientation are closely related. Therefore, based on the difference of external disturbance, according to the characteristics of China's architectural climate, Lhasa, Zhongwei and Xi'an (the annual cumulative solar radiation are: 7138 MJ/m~2 , 5853 MJ/m~2, 4406 MJ/Jm~2 ) are passive solar heating climate zoning: the best climate zone A, suitable Climate zone A, suitable for climate C area representatives, through on-site research and testing, combined with the local rural residential building structure characteristics and farmers living habits, the functional partition of the building and indoor thermal environment zoning are designed. Then, based on the principle of non - uniform energy - saving structure design, through the theoretical analysis and software simulation, the solar building envelope structure system based on the difference between the outer circumference orientation is analyzed in detail.The main achievements of this paper are:(1). According to the results of the indoor thermal environment test in Zhongwei and Lhasa, it was found that the local winter thermal environment was poor and did not meet the standard. According to the field survey results, it was found that the local residents had poor satisfaction with the indoor thermal environment. The residents have a strong desire to improvement of winter indoor thermal environment. The comprehensive temperature of outdoors in winter solstice in Xi'an, Zhongwei were calculated; Determine the heating period indoor thermal comfort indicators: the south side of the non-side room average temperature of not less than 14? , day and night temperature difference of not more than 6?; north to non-side room average temperature of not less than 8?, day and night temperature difference of not more than 6?; north-south wall temperature difference of not more than 4?.(2). On the basis of field investigation and literature analysis, a existing architectural model is abstracted and summarized on the basis of three regions. On this basis, a typical building model is optimized. According to the principle of equal heat flux density, the non-uniform heat transfer coefficient of three regions were calculated, and Ks* =l.341E* ?1.35KW* ?1.49KN* was determined of external wall structure as the typical building model. According to the steady-state method, the heat consumption of typical building model and the existing building in winter solstice were calculated, the results show that the 4mm ordinary steel hollow glass south of the windows in Xi'an, Zhongwei, Lhasa area are hot components, which Lhasa region has the greatest heat, followed by Wei, Xi'an minimum;compared to single glass aluminum window, Lhasa South to the window unit area can save 71.43 W/m~2, Zhongwei area can save 80.59W/m~2, Xi'an area can save 64.36 W/m~2.The heat consumption of typical building is only 37.1% (Xi'an), 34.1% (Zhongwei), 27.9%(Lhasa) for the existing building when using fly ash steam curing brick. The heat consumption of typical buildings with fly ash sintered brick is only 34.5% (Xi'an), 31.5% (Zhongwei) and 24.9% (Lhasa) of existing buildings.(3). The indoor air temperature of the typical building was calculate by DesignBuilder, and found that the temperature in south room is more higher than the north room; The air temperature in main bedroom of typical building relative to the existing building model has improved significantly, the increase: Xi'an about 4? , Zhongwei about 5?, Lhasa is about 5?.For the main bedroom and living room and other south room, the indoor air temperature of the typical building compared to the existing building has significantly improved, and for the storage room between the north to the room, The indoor air temperature of typical buildings in the Lhasa area is slightly lower than that of existing buildings, Compared to the existing building, the indoor air temperature of typical buildings in Zhongwei and Xi'an have slightly increased. The temperature in mainly room significantly improved and in secondary use of room basically unchanged, it is achieved the purpose of this building model thermal environment partition.