Research On Whole-life Carbon Emission Calculation And Emission Reduction Design Strategy Of Prefabricated Building

In 2020,China proposed the "carbon peaking and carbon neutrality" carbon goals to reduce greenhouse gas emissions and deal with environmental problems caused by global warming to achieve sustainable development.As one of the main sources of carbon emissions in China,the construction industry has vigorously developed energysaving and low-carbon buildings,and it is of great significance to China’s energy conservation and emission reduction to improve the energy conservation level of buildings and reduce carbon emissions.As an important way to achieve building energy conservation and emission reduction,prefabricated buildings have the advantages of improving labor efficiency,shortening construction period,and reducing on-site pollution,which is an inevitable trend in the development of the construction industry.In the above context,this paper will measure the carbon emissions of prefabricated buildings throughout the lifecycle,conduct carbon emission reduction design research on buildings,analyze the effect of design schemes,and propose emission reduction strategies according to the results.In this paper,the structural system,design principles and indicators of prefabricated buildings are sorted out,the life cycle theory evaluation framework and building life cycle theory are sorted out,and the carbon emission measurement methods suitable for this study are selected.Secondly,the stage division and carbon emission sources of prefabricated buildings and cast-in-place buildings were compared and analyzed.The whole life cycle of prefabricated buildings is divided into materialization stage,operation stage and demolition stage,among which the materialization stage is divided into materials production stage,materials transportation stage,prefabricated component production stage,prefabricated component transportation stage and construction stage;On the basis of the traditional building carbon emission measurement model,combined with the characteristics of prefabricated buildings,the carbon emission calculation model of the whole life cycle of prefabricated buildings is established according to the carbon emission coefficient method.Thirdly,combined with the project case to measure the carbon emissions of the building at different stages,the total carbon emissions of the prefabricated building during the whole life cycle and the proportion of carbon emissions at each stage are obtained,and the carbon emissions of the prefabricated building in the whole life cycle are obtained according to the results.The main sources,as well as the characteristics and influencing factors of carbon emissions at different stages.Finally,the influence of the main structural components and the components of different parts of the envelope on the carbon emissions of the building was analyzed in stages.The orthogonal experimental design method was used to study the impact of multi-factor and multi-level combination schemes on the carbon emissions of buildings throughout their life cycle,and the contribution of different factors to building carbon emissions was selected in the order of strength.based on the research results,targeted emission reduction strategies are proposed at different stages of the whole life cycle of buildings.