Study And Optimization Of Life Cycle CO₂ Emission Performance Of Exterior Wall Insulation System In Cold Area

This paper relies on the life cycle assessment theory of the exterior wall insulation system to establish a corresponding mathematical model to provide a theoretical basis for the life cycle CO₂ emissions of the exterior wall insulation system.Complete the carbon emission research of EPS,XPS,PUR,rock wool and other major wall insulation materials in the production stage through the scope definition,source analysis,inventory establishment,impact evaluation,etc,and sort the CO₂ emissions of each insulation board per unit volume.Taking a typical room as an example,this paper simulates the energy consumption of heating and air conditioning in the use stage,and compares the energy consumption laws of different types of insulation materials,different climatic zones,and different orientations.The thickness of the insulation board when the energy saving rate reaches50% is also given.According to the simulated energy consumption of heating and air conditioning,considering the corresponding energy carbon emission factors,the fitting formulas of energy consumption and CO₂ emissions with the heat transfer coefficient of the external wall insulation system in different regions are given.This article is based on the research of CO₂ emissions in the production stage and the simulation calculation of the energy consumption in the use stage,and the optimization of the external wall external insulation system based on the life cycle theory,and explores the best external wall thermal insulation system considering the life cycle CO₂ emissions and cost Thickness study.Combining economic and environmental benefits,the optimal thickness under each direction is the smallest in the south and the largest in the north;the thickness intervals in Beijing,Shenyang,and Harbin are50mm-90 mm,70mm-120 mm,and 80mm-140 mm.Define the comprehensive saving rate Z to consider the influence of two factors,and compare the Z value at the optimal thickness,such as XPS insulation>PUR insulation>EPS insulation>rock wool insulation.Therefore,when considering both economic and environmental benefits,XPS should be given priority,followed by PUR.Considering the influence of the height on the heat transfer coefficient,the optimal thickness of the insulation layer at different heights and the heat transfer coefficient of the outer surface do not change much according to the specifications.