Research On Assessment Of Low-carbon Building Based On LCA

As the acceleration of industrialization and urbanization, low-carbon energy technologies and carbon-free trend are bound to increase in the dual context of economic globalization and environmental degradation. The proportion of CO₂ generated by the construction sector in the whole society is more than 30%,"low-carbon buildings"are in-depth step by step from concept to concrete practice with the rise of low-carbon economy. According to the study by National Development and Reform Commission, the industrial sector is currently the greatest contribution to the field of energy saving. But after 2020, with the improvement of living standards and changes in consumption structure, the contribution of architecture and transport sector begins to strengthen.By 2050, the energy saving contribution rate of architecture will exceed transportation and industries, ranking the first, the third highest contribution rate in emissions reduction. In addition, compared to challenge and high investment to reduce the carbon by 10% to 20% from industrial products, from buildings it can be easily achieve 50% to 60% by strengthening the rationality of the envelope design, energy conservation and recycling and emission reduction technologies.The so-called low-carbon buildings based on LCA (Life Cycle Assessment), is the building taking the lowest CO₂ emissions throughout their life cycle including design, materials production, construction, operation until the removal process as an important evaluation criterion. Combined with the construction sector-related research data of a low-carbon city of Wuxi, this paper takes office building for example and analyses and evaluates the energy consumption of buildings in various stages of the quantitative characteristics based on life cycle assessment theory and framework; Considering the status and specificity of basis of LCA data in architecture, establishes the building life cycle carbon emissions calculation method for carbon emissions data support; Builds single building life cycle emissions model and energy consumption of artificial neural network computer model in use phase, creatively associating the sunshine duration, temperature and other climatic and environmental factors, temperature, illumination, wind speed and other indoor environmental factors and building energy consumption, and lays the basis for the quantify of predicted assessment method; Builds a low-carbon building life cycle assessment model by AHP, creatively proposes evaluation including before-prediction and after-statistics evaluation of low-carbon building"double LCA"evaluation model, scientific quantizes low-carbon indexes, combined with the three types of social property indicators, to ensure the integrity of the evaluation system and reasonability of results. Finally, it determines buildings low-carbon life-cycle roles and responsibilities at each stage to identify the development facing difficulties and challenges, proposed the market incentives for development of low-carbon building which provide a theoretical basis for choice of development path and scientific decision-making of policies.