| Global warming resulting from greenhouse gases emission has been spotlight of global attention for years. The United Nations Framework Convention on Climate Change (UNFCCC) of2009has urged the globally reaction to slow down the process of global warming. The life cycle of building, from raw material production, transportation, construction, installation, operation to demolition, is not only energy consumed but greenhouse gases eliminated, thus regarded as the major gateway for global warming. Among which, construction is the critical part for evaluating for its intensive and concentrative emission process. The process of construction not only consumes various sources but employed lots of construction machinery and transport equipment, thus released lots of greenhouse gases within a relatively short period. The greenhouse gases released from construction is the crucial part in evaluating the carbon emissions during the lifespan of building. How to effectively evaluate the greenhouse gases from construction is also the landmark for light carbon process.This paper firstly defines the objective and scope of greenhouse emission basing on the Life Cycle Assessment (LCA) theory and greenhouse construction framework as well as construction management technology theory. The GHG calculation and analyzing process focus on the construction units with the support of construction classification and integration evaluation. After finishing the GHG emission data base, the Mathematical Model for construction greenhouse gases emission will be established, defining a clear structure for greenhouse gases calculation and logical way for evaluating carbon emission.Based on the frame work of quantity calculation for greenhouse emission, a comprehensive integrated residential project of Pingshan, Shenzhen is selected for case study. As an integrated residential project, it covers various buildings of villas, high-rise residential, nurseries and comprehensive commercial building. The carbon emission calculation for this project is divided into5sections, namely:construction site organization, comprehensive commercial building, villas and high-rise residential, nurseries and normal residential. Specific study for the energy consumed/carbon emission ratio for different processes of construction is based on the detail study of a sample building-NO.8commercial building. The calculation aspects embrace earthwork, foundation, masonry and reinforced concrete works. In combined with other four sections of carbon emission calculation, the comprehensive analyse for this project will be provided.The objective of this paper is to construct a greenhouse gas emissions calculation model with quantity evaluation for construction process. This model is expected to serve as a solid foundation for evaluating carbon emission from construction process and provide technical support for carbon calculation for the whole life cycle. |
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