Research On Impacting Of Air Layer On Performance Of The "Integration" Exterior Wall Thermal Insulation System

Energy conservation is an important way to reduce environmental pollution andsolve the problem of energy crisis, building energy consumption accounts for about30%of social total energy consumption.With the continuous improvement ofurbanization level in our country and adjustment of industrial structure, the proportionof building energy consumption will continue to increase.To realize the goal of65%energy saving, it must improve the heat preservation and thermal insulationperformance of building envelope. At present, there is still a gap of heat preservationand thermal insulation technology of the external wall in our country compared to othercountries, so it is necessary to refer to foreign development experience and achievethermal bridge block and air break of external wall insulation system and so on,whichhas a very positive meaning for the development of domestic building energyefficiency.In this paper, use the "integration" external wall insulation system as theresearch object, through theoretical calculation, CFD simulation, DeST buildingenergy analysis and measured data and other methods to analyzing the influence of theair layer between the shape size to the heat preservation and thermal insulationperformance of "integration" external wall insulation system.First of all, this paper explains the Installation method and characteristics of ourcountry commonly external wall insulation system and the methods of dealing with themain node in the installation process, lists the advantages and disadvantages of wet anddry installation method, and points out the air space can be introduced to improvethermal insulation performance of the dry installation method.The third chapter first introduce the typical structure of "integration" external wallinsulation system and analysis the heat transfer theory of system based on the Fourierlaw and Guerra Shchev criterion such as the basic principle of heat conduction; And thesystem is simplified into a physical model, according to the climate conditions in Hefeiarea determine the boundary conditions, these issues will be simplified astwo-dimensional steady-state heat transfer temperature,then proceed CFD simulations.Research on analyzing the influence of the air layer between the shape size to the heattransfer performance of system, in order to determine the optimal installation size ofengineering application. The forth chapter applies the optimal shape size which calculated in the previouschapter in the demonstration project. The study uses the DeST which is the buildingenergy consumption analysis software to simulate the indoor temperature of thedemonstration project throughout the year, then analyzes the data. According to theprevious studies on indoor comfort, the research determines the opening time of winterheating and summer air condition, and puts forward the suggestions about buildingenergy efficiency in the area with hot summer and cold winter.Finally, the research analyzes the temperature and heat flux data collected inexperimental room, then analyzes the distribution of real-time temperature measuredabout the past two years. Combining with the collected data of heat flux, the studycalculates the heat resistance in December, January of winter and July, August ofsummer, it is concluded that heat preservation and heat insulation must be taken intoaccount in the area with hot summer and cold winter for building energy efficiency,choosing the optimal value, and can not pursuit the lower heat transfer coefficients ofmaintenance structure blindly.