Study On Distribution Of Carbon Emissions And Low-carbon Evaluation System In Urban Residential Areas

In recent years,with the increase of global temperature and the deterioration of ecological environment,building a low-carbon city has become a common concern of the world.The carbon emissions of urban residential areas occupy a large proportion of the total carbon emissions in urban areas,energy conservation and carbon emission reduction at the residential level is imperative.The existing residential areas in China are mainly composed of the residential areas built in 1980 s and 1990 s,and those built in 2000 s,the stock of the residential areas built in 1980 s and 1990 s is large,but the present status of the residential areas has many problems.This paper firstly makes clear the meaning,research object and research scope of urban residential area.Combing the relevant research theory and research methods,the author did a systematic investigation and study on the existing residential areas in Dalian city.(1)First of all,the present situation of the existing residential areas in Dalian was investigated,From the perspective of the geographical location,the composition of residents,the current situation of low carbon operation,the residents' psychological standards and other aspects,this paper analyzed the factors that affect the current l ow-carbon situation of the existing residential areas,and compared the the existing residential areas built in 1980 s and 1990 s and the ones built in 2000 s.(2)The indoor and outdoor carbon dioxide concentration in the existing residential area in Dalian was tested,and by using Rhino and Grasshopper software,we built the outdoor carbon dioxide concentration visualization model and studied the distribution characteristics and variation law.Then we compared the indoor and outdoor carbon dioxide concentration,and the carbon source,carbon sink and key emission reduction targets of the existing residential areas were studied.(3)The low carbon evaluation system and fuzzy comprehensive evaluation method for the existing residential areas were constructed.On the basis of the previous research and test results,low carbon factors in the living area were classified according to the level of people,buildings and environment.Based on the analytic hierarchy process(AHP),a low carbon evaluation system based on people-building-environment were constructed,and based on the theory of fuzzy mathematics,the fuzzy comprehensive evaluation model of low carbon grade and the fuzzy comprehensive evaluation model for low carbon quality of existing residential areas are established.(4)Taking Changping district as an example,the fuzzy comprehensive evaluation of low carbon grade was carried out,the results show that the low carbon status of Changping District is medium.Similarly,the same low carbon grade evaluation and comparative analysis were carried out for other research areas,the results show that the present situation of low carbon in the existing residential areas built in 2000 s is generally better than the ones built in 1980 s and 1990 s.(5)on the basis of the above research,this paper puts forward the low-carbon renovation strategy for the existing residential areas in Dalian from the aspects of low-carbon life,residential construction and residential environment.Through the research,the influencing factors of low carbon status of existing residential areas and carbon sources,carbon sinks and key emission reduction targets in the residential areas are defined.This paper provides a method to construct the evaluation system and fuzzy comprehensive evaluation of existing residential areas.It also provides a theoretical basis and factual basis for the establishment of a reasonable low carbon update strategy and improment of the low-carbon status of existing residential areas.