Analysis And Case Study On Building Carbon Emission Based On Hybrid LCA

In the context of global emissions reduction,the trend has become to low-carbon buildings.As a major carbon emitting country,it is urgent to promote emission reduction in the construction industry and establish a model for carbon emissions and calculation in buildings.However,at present,China’s building carbon emission calculation standards are not perfect,and the lack of building carbon emission assessment system does not meet the current development needs.Therefore,it is important to study the life cycle carbon emissions of buildings.Firstly,this paper reviews the relevant research in building carbon emissions,establishes the knowledge map using Citespace software and discusses the current development status and future trends in this field.This paper finds that there is still much room for research on method optimization,uncertainty analysis and multi-objective optimization in the assessment of building life-cycle carbon emissions.Secondly,the current common measurement methods for building carbon emissions,namely the based process life cycle analysis method and the based input-output analysis method,are introduced in detail.In response to the shortcomings of the calculation methods,a model for calculating carbon emissions at different stages of the building life cycle is proposed.The model introduces sectoral complete carbon emission factors calculated from the China Input-Output Tables 2012 and the Energy Statistics Yearbook 2012 to replace the missing data in the process analysis,improve the system boundary and optimize the process analysis method.Finally,using a hospital as a case study,the calculation model was applied to quantify carbon emissions at various stages.The results show that the total carbon emissions of the hospital are 43,283.66 t CO₂eq,with the production,construction,maintenance and end-of-life phases accounting for 9.13%,0.35%,90.06%and 0.46%of the total carbon emissions respectively.The feasibility of the model proposed in this paper is verified by comparing it with the results of existing studies.In addition,the influencing factors are analyzed for each stage of carbon emissions,and corresponding suggestions for emission reduction measures are given.This paper provides a visual analysis of the assessment of carbon emissions from buildings and summarizes the current state of research and trends in this area.The building life cycle calculation model established in this paper also provides ideas for the carbon emissions of China’s buildings,and is of some significance to the research on building carbon emissions calculation.