Research On Carbon Emission In The Whole Life Cycle Of Prefabricated Buildings Based On BIM

In recent years,under the background of rapid economic growth and accelerating urbanization,construction industry develops rapidly,but it also brings about environmental problems.The construction industry is one of the world’s largest emitters of carbon dioxide,with buildings accounting for about 30% of the world’s total carbon dioxide emissions.The negative impact of the greenhouse effect has prompted all walks of life in the world to continue to explore on the road of energy conservation and emission reduction.It is extremely urgent for the construction industry to significantly reduce carbon dioxide emissions while maintaining high productivity.In this context,prefabricated building came into being.Prefabricated buildings achieve the purpose of saving resources,shortening construction period,improving quality and reducing pollution by means of complete production system and specialized production mode.Its advantage in energy conservation and emission reduction is an important reason for the rapid development of prefabricated buildings in China.In order to verify the effect of energy saving and emission reduction,this paper studies the carbon emission of the whole life cycle of prefabricated buildings.How to calculate the carbon emission at all stages in a complete,accurate and efficient way is an important subject in the study of building carbon emission.The emergence of BIM technology provides convenience for the measurement of building carbon emission.According to the carbon emission characteristics in the whole life cycle of prefabricated buildings,carbon emission of six stages is calculated and analyzed: building materials production,component preparation,logistics transportation,installation and construction,operation and maintenance,and demolition and recovery.First of all,the carbon emission factors of main energy,material,machinery,transportation and workers were collected and determined by investigating a large amount of literature.The carbon emission accounting model of six stages is established according to the carbon emission characteristics in the whole life cycle,and the carbon emission calculation efficiency and accuracy are improved based on BIM technology.Then,five prefabricated building projects are taken as examples to conduct empirical research.The carbon emission of each stage is calculated,and the carbon emission characteristics of the six stages are analyzed.The relationship between carbon emission of each stage and prefabrication rate is also studied and analyzed.Finally,the carbon emission index of prefabricated building function unit is analyzed,the carbon emission law of each stage is summarized,and corresponding emission reduction strategies are proposed according to the carbon emission characteristics of each stage in the whole life cycle.By exploring the relationship between carbon emission and prefabrication rate,this paper proves the superiority of prefabricated building in energy conservation and emission reduction.The emission reduction strategies proposed in each stage provide a reference for further energy conservation and emission reduction in the construction industry.