The Energy Efficiency Design and Application Research of Self-thermal Insulation System of External Walls in Changsha
|Course||Heating,Gas Supply, Ventilation and Air Conditioning Engineering|
|Keywords||Self-thermal insulation system of external wall Energy efficiency rate Life cycle cost analysis(LCCA) Thermal bridge Autoclaved aerated concrete block Light aggregate concrete perforated brick SSB ceramsite thermal insulation brick|
With further severity of the situation of energy sources as well as increasing growth of the energy consumption of buildings, energy conservation of buildings seems more and more important. Wall, as the parcel of building envelope structures, plays a significant role in energy saving. The paper focuses on modeling and calculating the energy consumption of infrastructure construction in Changsha and concludes that the heat consumption of external walls accounts for48percents of the total heat consumption of whole envelope structures. However, there are some safety problems such as fire disaster and the splitting of crack in high-buildings, which provides favorable opportunities and spaces for the development and utilization of self-thermal insulation system of external wall.Thermal parameters can be studied by investigating thermal performances of the existing self-thermal materials including autoclaved aerated concrete block, light aggregate concrete perforated brick, SSB ceramsite thermal insulation brick. The range of the thermal bridge rate applied in different structures in Changsha can be obtained through market research, and then the application scope of this rate in different self-thermal systems can be analyzed. Meanwhile, the economic performances of different self-thermal systems can be investigated according to life cycle cost by finding out the market price of different materials. Then it can be concluded that the life cycle cost of self-thermal insulation of external wall is lower than the cost of walls with out heat insulator and this thermal insulation system has high economic value. The handling opinions can be suggested by studying the "thermal bridge" of the beam to column connection in frame structures. The energy efficiency rate can be calculated combining with certain structure in Changsha. The result shows that the analyzed structure is in conformity with the national standards and provincial standards. The application of self-thermal materials and the development of energy conservation of external walls in Changsha can be finally promoted through this study.