Research On Carbon Emission Accumulation Of Existing Residential Buildings In Xi'an

Under the background of global climate change and relatively large energy consumption in construction industry,energy saving and emission reduction has become the focus of attention in China.Therefore,in the whole life cycle of architecture,the comprehensive evaluation of architecture has gradually become the key research content of sustainable development.In recent years,the environmental impact assessment methods and models based on the whole life cycle of architecture have become more and more perfect.Most of them are based on the calculation of carbon emissions from the whole life cycle of new buildings,while the quantitative research on existing buildings has been tried by some scholars,but it is still in the early stage of development.At the same time,in view of the large stock of existing buildings and the fact that residential buildings have always occupied a large number of blocks in residential buildings,and this proportion is in a growing trend,and the carbon emissions produced by them have a certain delayed effect on the environment and continue to accumulate.Therefore,it has a great impact on the environment.First of all,through previous domestic and international literature research and analysis and summary,the existing research methods of building life cycle evaluation and carbon emissions calculation methods are systematically summarized.Based on the analysis of the research and application of the evaluation method and the calculation method in the architectural level,the deficiency of the current research is summarized.Secondly,in view of the deficiency of the current research and the development of the existing buildings,the research framework of the building is determined,and the purpose,scope and calculation method of the carbon emissions of the building are clearly defined.On the basis of the existing calculation methods,the time factor is added,and the accounting model is established on the premise of clearly aiming at the accumulation of carbon emissions from existing buildings,and the evaluation method for the carbon emissions of existing buildings is put forward.According to the historical economic input-output table,the carbon emission factors of the main building materials are calculated according to the input-output analysis method,and then according to the estimation method of the National greenhouse Gas IPCC Guide,The carbon dioxide emissions per unit of fossil fuels in China are calculated and the carbon emission coefficients of standard coal are obtained according to the characteristics of energy statistics in China.On the basis of these,the carbon emissions and trends of the main building materials are obtained.The mixed life cycle accounting system and model established in this paper are applied to the actual construction cases,and the case study is carried out.The residential area of the South Institute of Xi'an University of Architecture and Technology contains the requirements of this study.Therefore,the residential buildings in different ages are selected as the research object,the carbon emissions of their life cycle are calculated in detail and abstractly typed,and summarized and explained from the time dimension,material usage and structural category level.Finally,according to five residential cases in the five decades,the paper analyzes the carbon emissions in its life cycle,that is,the accumulation of carbon emissions in existing buildings.The carbon emission calculation model of the whole life cycle of existing buildings and the historical trends can be used to predict the future carbon emissions of buildings and to contribute to the micro-renewal of urban buildings.In the whole life cycle,the paper summarizes and analyzes the key objects and processes of carbon emissions,aiming at energy saving and emission reduction,in order to contribute to urban climate change.