| Following the changes in housing policies,residential construction in China experienced rapid development in the 1980 s and 1990 s.However,due to the economic and technological constraints at the time,as well as lower energy conservation standards,a large number of existing residential areas no longer meet the growing needs of people’s daily lives and current low-carbon standards.In the context of increasingly severe global climate issues and under the national ’dual carbon’ strategic goals,the transformation of existing residential areas plays a crucial role in improving people’s living standards and reducing carbon emissions throughout the life cycle of buildings.Although quantitative research on carbon emissions of individual residential buildings and environmental improvements in residential areas has become relatively mature,there is still a lack of research on the carbon emissions quantification of the transformation process in existing residential areas,and the effectiveness of low-carbon technologies in reducing carbon emissions remains unclear.To address this issue,this study focuses on existing multi-story residential areas in cold regions,examining the actual carbon reduction effects of various low-carbon technologies in residential area transformations,using methods such as field research,literature review,and comparative simulation,with the aim of providing objective and quantified data support for low-carbon transformation design in these areas.This paper first analyzes typical domestic and international cases,summarizing and screening frequently applied low-carbon technology measures.Secondly,from the perspective of the life cycle of residential area transformation,a new life cycle carbon emission accounting system boundary is established,along with a low-carbon technology accounting inventory and indicator system for the transformation of existing residential areas.Based on the ’Building Carbon Emission Calculation Standard’,the carbon emission accounting method of the transformation process is applied to the calculation of carbon emissions for each single technology in the inventory system.The net carbon amount and carbon recovery time of each technology in the inventory are evaluated and calculated from seven aspects:renewable energy,building envelope,water resources,waste recycling,equipment and facilities,transportation,and greening.The carbon reduction effects of each technology are evaluated and compared through a quantitative method,and a hierarchical optimal technology inventory suitable for existing residential areas is derived to provide design guidelines for instance transformation.Finally,the resulting optimal technology inventory system is applied to the low-carbon transformation design research of Beijing’s Enjili neighborhood.The carbon emissions of the residential area after adopting carbon emission reduction technology are calculated quantitatively,and its carbon reduction effect is verified,obtaining an appropriate carbon emission reduction strategy for existing multi-story residential area transformation.According to simulation calculations,the transformed Enjili neighborhood can reduce carbon emissions by approximately 24.6% annually,demonstrating significant carbon reduction effects and validating the research conclusions of this paper.This research can provide a quantitative design basis for low-carbon transformation of similar existing residential areas,and carries practical guiding significance. |
