Research Of CO₂ Emission Of Building External Wall Insulation System In Materialization Procession Zheiiang Province

Under the context of global warming,how to slow down the CO₂ emission has attracted world's attention.Construction and related industries contribute nearly a third of global carbon emissions.Along with the continuous progress of building energy conservation and emission reduction,using insulation system to improve theinsulation properties of external walls to reduce energy consumption in buildings has become the commonest way of building energy conservation and emission reduction.In this paper,the research on the potential of building energy conservation and emission reduction of building external wall insulation system isn't limited on the use-phase,however,using life cycle assessment theory to establish a scientific and perfect quantification materialization process evaluation model to give detailed analysis of different building external wall insulation system.In this paper,the materialization process of building exterior insulation system is divided into seven major stages:material production stage,transportation phase,construction stage,building material renewal,demolition,recycling and disposal phase.Based on the relevant calculation methods of IPCC and building carbon emission,the data of energy CO₂ emission factor,building material production CO₂ emission factor,transportation CO₂ emission factor,construction CO₂ emission factor and so on were established which are suitable for Zhejiang Province.Moreover,author investigated and surveyed industry-leading self-insulating wall materials and related materials manufacturers in Zhejiang Province to get primary data and calculate building material production CO₂ emission factor of 7 commonly used self-insulation wall material,including autoclaved aerated concrete aerated concrete blocks,bio-sludge ceramic aerated concrete blocks,etc.,which updated and completed the carbon emissions database of Zhejiang Province.In order to compare the carbon reduction capacity of different building exterior wall insulation system,a residential building in Hangzhou was selected as case and used the calculation model given in this paper to calculate materialization process carbon emission.The data shows that under the same heat preservation effect,compared to XPS thin-plate external insulation,internal insulation and sandwich insulation system,self-insulation system and vitrified microsphere thermal insulation mortar combined heat preservation system showed better emission reduction potential.Increasing the capacity of masonry material moderately can reduce the use of masonry mortar,which can reduce carbon emissions of building materials production,transportation and abandonment stage.However,for the same wall structure of self-insulation system,the thermal insulation of concrete self-insulation block,autoclaved aerated concrete blocks and other concrete materials is better than sintering products,which can reduce heating and cooling energy consumption.Based on the output data of case,this paper suggests that self-insulation system and vitrified microsphere thermal insulation mortar combined heat preservation system should be prioritized in the selection of external thermal insulation form of residential building in hot summer and cold winter zone,when select basic wall material can consider autoclaved aerated concrete blocks,concrete self-insulation block primarily.