Study On Carbon Emission Of Residential Buildings In Hot Summer And Warm Winter Area

Serious environmental problems caused by global warming have attracted the attention of the world,especially China.President Xi proposed to realize the"double carbon"strategy of"carbon peak"in 2030 and"carbon neutralization"in 2060.Construction industry consumes 30-40%of global energy and produces about 30%of greenhouse gases.It is a key industry in energy conservation and emission reduction.As one of the largest building types in China,residential buildings are the focus of energy conservation and emission reduction in the construction industry.Therefore,this thesis studies life cycle carbon emission of residential buildings in hot summer and warm winter area,establishes carbon emission calculation model of residential building in hot summer and warm winter area,selects typical case to analyze its carbon emission laws,and puts forward targeted and feasible carbon emission reduction strategies,which is of certain significance to achieve energy conservation and emission reduction goal of China’s construction industry.Research contents of this thesis include:firstly,based on life cycle assessment（LCA）,life cycle of building is divided into material production and transportation stage,construction stage,operation stage and demolition and recycling stage.Secondly,analyze sources of carbon emission in each stage,and establish calculation model of carbon emission of residential building in hot summer and warm winter area combined with carbon emission factor method.A reinforced concrete high-rise residence in Guangzhou,a typical city in hot summer and warm winter,is selected as a case building to calculate life cycle carbon emission,and analyze composition and law of carbon emission.Finally,life cycle emission reduction strategy of residential buildings is put forward.Calculation results show that a total of 55140.02tCO₂eq of carbon emission are generated in life cycle of the case building,including 66.05%in operation stage,31.85%in material production and transportation stage,1.21%in demolition and recycling stage and0.89%in construction stage;Proportion of carbon emission in operation stage is the largest and that in construction stage is the smallest.In operation stage,carbon emission from air conditioning system,lighting system,elevator system and household appliances account for48.43%,33.13%,6.14%and 12.30%respectively;Carbon emission of air conditioning system accounts for the largest proportion,and carbon emission of elevator system accounts for the smallest proportion.In material production and transportation stage,carbon emission of concrete and steel accounted for 36.58%and 35.34%respectively.In demolition and recycling stage,carbon emission in demolition process,on-site sorting process,transportation process and recycling process are 32.66%,52.94%,12.87%and 1.54%respectively;Carbon emission of on-site sorting process accounts for the largest proportion,and carbon emission of recovery process accounts for the smallest proportion.Carbon emission reduction strategies specifically includes:optimizing production process of building materials,reasonably selecting building materials,optimizing construction organization design,changing building orientation,building storey height,switching to energy-saving electrical equipment,increasing outdoor greening and paying attention to demolition and recycling stage.Carbon emission calculation model of residential building in hot summer and warm winter area established in this thesis provides a certain reference for life cycle carbon emission analysis of other residential buildings in this area.Carbon emission reduction strategy formed through the analysis of the law of building carbon emission in the case has a certain reference value for energy conservation and emission reduction of other residential buildings.