Study On Thermal Performance Of Green Building Wall In Severe Cold Area

How to reduce energy consumption has become an important research topic in the field of building energy efficiency.The thermal performance of the external structure of the building has a great influence on the building energy consumption,and the thermal performance of the building wall is the largest impact on the building energy consumption.This paper mainly carries out the thermal performance of the building wall in the cold area.There are many ways to adopt the insulation measures of the building wall.In this paper,three different wall insulation systems are compared to analyze the performance characteristics of each insulation system.It is found that the wall insulation system is widely used,especially in the cold area.Based on the experimental study of several typical wall types in Changchun area,the change of heat transfer coefficient of different types of wall is compared with that of "green building evaluation standard" GB / T50378-2014(hereinafter referred to as " The results show that the " 50 mm thick EPS insulation board + aerated concrete wall " and " 60 mm thick EPS insulation board " is the result of the cold and heat load and the total load of the building.+ Coal gangue porous brick wall " building heating period cumulative total load and " public building energy efficiency de sign standards " GB50189-2015 on the cold area to meet the external wall heat transfer coefficient of wall structures compared to the cumulative total load reduction Less than 5% in the "green standard" in the points.Therefore,the study of the thermal performance of green building wall should not only consider the reduction of heat transfer coefficient,but also with the "energy saving 65%" standard wall building load to make a comparison.In this paper,from the technical,economic,energy saving point of view,carried out the wall insulation layer optimization study.Based on the life cycle method and the number of heating days,the total cost of the whole building life cycle is deduced.By studying the relationship between the cost of the insulation material and the heating cost of the building,the concept of the thickness of the insulation layer is put forward.The influence of the present value coefficient PWF,the number of heating days HDD18,the wall thermal resistance R and so on on the thickness of the economic insulation layer is analyzed.It is pointed out that in determining the thickness of the economic insulation layer in different regions,the actual parameters should be calculated by combining the local actual parameters.Get it.This paper calculates the thickness of the economic insulation layer of several typical wall structures in Changchun area,and provides technical support for the selection of insulation material type and thickness in this area.