Studies On Assessment Of Low-carbon Public Buildings Based On Life Cycle Theories

Abstract:At present, low-carbon economy has become a global consensus, and low-carbon building is becoming an irreversible trend in the development of construction industry. In our country, the public buildings have the features of high energy consumption and low energy efficiency, so studies on assessment of low-carbon public buildings has very important significance in guiding low-carbon buildings development and promoting its implementation. Carbon emissions indicator in life cycle is a significant indication to judge whether public buildings reach the low-carbon goal or not. The paper studied the methods of measuring public buildings carbon emissions in the view of life cycle. For the source of carbon emissions from building products forming stage, operation&maintenance stage, and demolition stage, the paper made a detailed list, analyzed the quantitative way and established a relatively complete calculation framework of public buildings’carbon emissions. Based on the theory of life cycle energy consumption, systems engineering and circular economy theory, this paper made a concrete analysis of factors which influence the low carbon evaluation of public buildings from every stage. According to these factors, combining with the method of literature statistical, the assessment system indicators are preliminarily built. The assessment system indicators are modified, and lastly the evaluation index system for low-carbon public buildings is constructed. By analyzing the ways to calculate the weight of each indicator, such as Delphi method, entropy method and AHP, ANP is selected for calculating the weight of evaluation indicators, with the aid of Super Decisions software. In this paper, the theory and scope of fuzzy synthetic evaluation, date envelopment analysis and gray comprehensive evaluation are discussed and analyzed respectively, and gray cluster evaluation is used to make comprehensive assessment for low-carbon public buildings. Besides, the paper also put forward classification criteria of low-carbon buildings. To examine the applicability and feasibility of evaluation methods and indicators, a project of public buildings in Beijing is taken as example.