Research On Optimizing The Thickness Of The Exterior Insulation Layer Of The Exterior Wall Of Residential Buildings In Hot Summer And Cold Winter Areas Based On Technical Economic Analysis

Under the new situation,saving investment,reducing energy consumption,and reducing greenhouse gas emissions are important goals for the development of the construction industry.Within a certain thickness range,the increase in the thickness of the outer insulation layer of the outer wall can improve the energy-saving and emission reduction effect of the outer insulation technology of the outer wall.At the same time,the investment cost of the insulation layer also increases.The current thickness of the outer insulation layer of the outer wall cannot take into account the economics,energy saving and emission reduction of the insulation layer,resulting in problems such as high costs,high energy consumption,and high greenhouse gas emissions related to the thickness of the outer insulation layer of the outer wall.Few literatures have conducted optimization studies on the thickness of the external insulation layer of the external wall from the perspective of improving the economic effect of the external insulation layer technology on the premise of considering the energy consumption and greenhouse gas emission factors related to the external insulation layer thickness of the external wall.Few literatures consider the influence of the unique intermittent operation mode of heating and cooling equipment on the thickness of the outer wall insulation layer in hot summer and cold winter regions.In this paper,the optimal thickness of the outer insulation layer of the outer wall of the residential building in the hot summer and cold winter area is taken as the research object.Taking into account the energy consumption factors and greenhouse gas emission factors related to the thickness of the outer insulation layer of the outer wall,from the perspective of improving the economic effect of the technology of external insulation of external walls,a basic analysis framework for determining the optimal thickness of external insulation of external walls in hot summer and cold winter areas based on technical and economic methods is proposed.Specifically,this paper uses building energy simulation software,Integrated Environmental Solutions-Virtual Environment(IES-VE),to calculate heating and cooling energy consumption of the building,and on this basis,uses heating and cooling energy consumption price,energy consumption monetization coefficient and greenhouse gas monetization coefficient yields incremental benefits of insulation thickness.The thermal insulation layer price,energy consumption monetization coefficient and greenhouse gas monetization coefficient are used to obtain the incremental cost of the thermal insulation layer thickness.The economic net present value is used to represent the comprehensive index of incremental benefits and incremental cost of insulation thickness.On this basis,taking the typical residential buildings in typical cities(Wuhan,Changsha,Hangzhou,Chengdu)in hot summer and cold winter regions as an example,polystyrene foam board is used as the insulation material to find out the optimal thickness of the outer insulation layer of the external wall under the continuous operation mode and intermittent operation mode of air conditioning.The results show that,in the hot summer and cold winter area,the traditional thickness of the external wall insulation layer(30mm)cannot achieve the best economic benefits of the external wall insulation technology.There is a slight difference in the optimal thickness of the outer thermal insulation layer of the outer walls of residential buildings in four typical cities in hot summer and cold winter zone.Under the intermittent energy consumption scenario,the optimal thickness of the outer insulation layer of the outer walls of residential buildings in Wuhan,Changsha,Hangzhou,and Chengdu is 50 mm,50 mm,50 mm and 40 mm.Under the continuous energy consumption scenario,the optimal thickness of the outer insulation layer of the external walls of residential buildings in Wuhan,Changsha,Hangzhou,and Chengdu is 70 mm,70 mm,70 mm and 60 mm.Two different operation modes(continuous and intermittent)of air conditioning influence the optimal thickness of the external insulation of the external wall.The optimal thickness of the external insulation of the external wall based on the continuous operation mode is not less than that based on the intermittent operation mode.