Research On Thermal Performance And Construction Technology Of Aerated Concrete Sandwich Inorganic Insulation Exterior Wall Panel

Developing prefabricated building is an important way to realize building industrialization.In recent years,prefabricated building have entered a stage of rapid development,but at present,there are few exterior wall panels suitable for prefabricated building,which to some extent limits the promotion and application of prefabricated building in practical projects.The aerated concrete sandwich inorganic insulation exterior wall panel is composed of aerated concrete panels and inorganic cotton insulation panels,which have characteristics such as lightweight,high strength,fire resistance,and sound insulation.Therefore,the research on the thermal performance and structural technology of the aerated concrete sandwich inorganic insulation exterior wall panel is of great significance to promote the development of prefabricated building.Based on the analysis of the thermal performance impact of wall panels,a steady-state heat transfer model for sandwich inorganic insulation wall panels was established.The correction coefficients for the thermal conductivity of the main components of aerated concrete sandwich inorganic insulation wall panels were studied,and the effects of reinforcement,tension components,and steel connectors inside the wall panels on the equivalent thermal conductivity of each structural layer of the wall panels were analyzed.The results show that under the premise of considering the equilibrium moisture content of aerated concrete,the correction coefficient for the thermal conductivity of the outer leaf aerated concrete is 1.11;When the inner leaf aerated concrete is 150 mm,170mm,and 200 mm,the correction coefficients for the thermal conductivity of the inner leaf aerated concrete are 1.17,1.18,and 1.19,respectively.The thermal bridge effect at the junction embedded in the inorganic cotton insulation layer is obvious.Considering the equilibrium moisture content of the inorganic cotton insulation layer,the range of correction coefficients for thermal conductivity of different thicknesses of inorganic cotton is 1.34～1.41.According to the requirements of the exterior wall system of prefabricated building,the structural design of the embedded sandwich inorganic thermal insulation exterior wall panel system is proposed.Through the heat transfer simulation analysis of the thermal bridge part,the thermal performance of the thermal bridge part of the sandwich inorganic thermal insulation exterior wall panel system is studied.The results show that the structure of the thermal bridge part of the sandwich inorganic thermal insulation exterior wall panel is reasonable,and the internal surface temperature of the external wall thermal bridge is much higher than the dew point temperature;The typical sandwich inorganic insulation exterior wall unit heat transfer model was established,and the average heat transfer coefficient of the exterior wall with different thickness and different window wall ratio was simulated and analyzed.The correction coefficient value of the heat transfer coefficient of the main section of the exterior wall was proposed.If the exterior wall is a common window,it is recommended to take 1.10;When the exterior wall is a bay window,it is recommended to take 1.23.Taking a public building in Jinan as a demonstration project,the energy-saving design of the aerated concrete sandwich inorganic thermal insulation external wall system was carried out.Based on the energy consumption simulation of Tianzheng Energy Conservation,the energy-saving analysis was carried out on the influencing factors of different external protective structures and design suggestions were put forward.The results showed that the heat transfer coefficient of the external window had the greatest impact on the building energy consumption.In addition,the heat transfer coefficient of the external wall The heat transfer coefficient of the roof and the heat transfer coefficient of the external window have a certain impact on the building energy consumption.The research results can provide technical reference for the engineering application of the aerated concrete sandwich inorganic insulation exterior wall panels.