Research On CO₂Emission Accounting Model And Evaluating System Of Low-carbon Residential Building Based On LCA

As a whole process of environment management tool, life cycle assessment hasbeen wildly applied in all fields. Based on the summary of present condition of low-carbon buildings researches. Firstly, the definition and connation of low-carbonbuilding is presented, and makes out the difference and relationship between it andother types of building.The residential building was divied into six stages, including building materialproduction, transport, construction, fitment, operation, building demolishing andwaster treatment. According to life cycle assessment, established the model of carbondioxide emission, which is the product of activity factor and emission factor based onIPCC method. But there is a difference between activity factors. Based on the content,the activity factors are divied into six categories: building material consumption, RTK,rating per machine per team, building energy consumption, reuse of materials, recycleof materials.Based on the accounting model, the carbon emission of building operation andmaterial production are77.92%and17.25%of the total. Fitment, construction,demolishing and waster treatment and transport make up1.78%,1.60%,1.42%and0.02%, respectively. According to the sensitivity analysis of carbon dioxide emissions:with the reduction of the service life of the residential building, the emission graduallyincreased from67.51kg/m~2·a of50years to132.05kg/m~2·a of10years.Energy consumption of a representative household in Ma’anshan city wasmeasured for a year. The emissions of cooking&hot water and space heating/coolingtake46.45%and30.39%respectively. Refrigerator, audio visual and lighting take8.37%,7.39%and5.04%, respectively. The energy consumption characteristics ofhousehold devices are studied on the basis of the measured data.Combining with the building characteristics and green building assessmentsystem. The analysis of factors of carbon dioxide emissions for six phases wasanalyzed and low-carbon building evaluation system framework was established. Theresults may maid in providing reference for low-carbon building evaluation system.