Study On Thermal Performance Of Residential Wall In Hot Summer And Cold Winter Area

Hot summer and cold winter areas are hot and hot in summer and cold and humid in winter.The harsh climate conditions make the indoor thermal and humid environment of residential buildings worse,which leads to the increasing use rate of split air conditioning in this area.However,due to climate characteristics and people’s living habits,the heating and air-conditioning habits in this area show the characteristics of part of space and part of time.This intermittent heating and air-conditioning characteristics not only need to optimize the outer envelope structure,but also make the heat transfer in adjacent rooms particularly important.Based on the heating and air conditioning habits of partial air conditioning in hot summer and cold winter areas,this paper analyses the influence of neighborhood heat transfer on building energy consumption and indoor thermal comfort,and then obtains the optimized heat transfer coefficient of partition wall,and puts forward suggestions for the current standards.Firstly,the typical energy consumption modes of space heating and air-conditioning modes in part of time in this area are investigated by means of questionnaires.Through consulting the literature and field investigation,we know the actual practice of partition wall in this area,and find that the practice of residential partition wall in 1980s-1990 s is not rigorous,the heat transfer coefficient is high,and the new residential building meets the requirements of current energy-saving standards.However,the limit value in the energy saving standard is based on the value obtained under the full operating mode(steady state),and its application in the intermittent mode needs to be discussed.Then the heat transfer law of adjacent chamber under intermittent operation mode is analyzed by theoretical deduction.Secondly,based on Energyplus,this paper establishes an optimization target of building energy consumption and indoor thermal comfort,and takes heat transfer coefficient of partition wall,location of insulation layer and operation mode of adjacent two rooms as design optimization parameters,controls thermal performance of building envelope structure and other passive strategies unchanged.For living room mode and natural room,bedroom model and natural room and living room mode and bedroom mode,it also controls the thermal performance of building envelope structure and other passive strategies.The multi-objective optimization of three practical intermittent operation modes is used to analyze the optimal value of heat transfer coefficient of partition wall under different operation conditions.Then,the optimized partition wall is verified by the experimental platform of Chongqing University’s mechanical and electrical building.Finally,it is found that the temperature of laboratory,experimental wall temperature and simulated indoor wall temperature are in good agreement,but the difference between supply air temperature and supply air speed is large.In order to further verify the accuracy of simulation data,based on the consistency of experimental data and simulated data rules,the author uses variance analysis to carry out regression analysis.Through analysis,the experiment is concluded.Although there are differences in absolute values between the data and the simulation data,there is a strong linear relationship between the values,and F test is carried out to verify the significance.Finally,in order to reduce the design cost,based on the optimal values of all kinds of partitions analyzed above,the author uses the flat heat transfer coefficient method and life cycle economic analysis method to carry out comprehensive optimization analysis of all kinds of partitions.Finally,it is concluded that although the life cycle economic analysis method is widely used,it has more influencing factors and greater uncertainty.The average heat transfer coefficient method is simple to calculate,easy to analyze and more applicable.Finally,the paper discusses the optimization of partition wall to predict and evaluate the energy-saving potential and benefits of each region in the future.It is concluded that the energy-saving rate of this region can be generally increased by 2%-3%,and the use of 0.32 billion tons of standard coal can be reduced..