Study On The Evaluation Model And Application Of Carbon Footprint In The Materialization Stage Of Assembly Building

With the progress of the social economy and the acceleration of the process of industrialization,the environmental problems arising from the production and living activities of people are becoming more and more serious.The global warming caused by the greenhouse effect is getting more unignoreable.Saving energy and reducing the emission of greenhouse gases has become a worldwide problem.In order to effectively evaluate the effect of energy saving and emission reduction of people’s production and living activities,various greenhouse gas quantitative evaluation methods have been established,among them the carbon footprint method is widely applied in the world.This study established the carbon footprint calculation model during materialized stage of assembled residential building,which contained the carbon footprint due to consumption of material,energy,and resource during the process in materialized stage.Firstly,the carbon emission path and carbon source of materialization stage were analyzed,and the calculation boundary of carbon emissions was determined.Quantitative calculation process and calculation method of carbon emission in materialized stage of assembly house were determined by Process-based LCA method,and the calculation model of carbon footprint in materialized stage of assembly house was established.According to the sub-process of materialization phase data collection was conducted.Through the field investigation of the prefabricated plant,the carbon footprint factor database of the component production was updated.The "carbon footprint evaluation system in the phase of the materialization of assembly houses" is developed and established by Researching and applicating of BIM Technology,and obtaining the bill of engineering quantities according to the consumption quota of the assembled residential building engineering,and clearing the data sources of carbon footprint calculation,then combineing BIM technology with material consumption calculation and engineering quantity calculation,and applying the carbon footprint evaluation model of assembly housing in materialization stage.Finally,by evaluating the case application of the system,the carbon footprint evaluation of the 12 buildings from the South and the north in the materialization stage is carried out,and the carbon footprint differences between the traditional housing and the fabricated housing in the materialization stage are analyzed based on the regional distribution of the north and south.The ECER index is applied to evaluate the effect of prefabricated production and assembled construction mode on energy saving and emission reduction compared with traditional cast-in-place mode.Analysis results show that the effect of energy saving and emission reduction in most cases has not yet reached the "13th Five-Year" policy,but the carbon footprint calculating results of the cases showed that the overall level of prefabricatedhousing carbon footprint in materialized stage is lower than the traditional residential,prefabricated production and assembled construction mode is energy saving and emission reduction.