Study On Calculation Model Of Building Carbon Footprint Based On BIM

In recent years,many environmental problems caused by energy consumption have attracted attention.Among them,building energy consumption,as the main energy consumption in China,is second only to industrial energy consumption.With the development of economy and society and the advancement of' urbanization process,building energy consumption continues to grow,which has an important impact on resources and environment.Building energy consumption is generally measured by carbon footprint,but there is no model and application system that can effectively quantify and standardize calculation.Therefore,it is of great theoretical value and practical significance to fully understand the sources and Jaws of building carbon emissions,optimize building design by quantifying building carbon footprint,and then control building energy consumption,reduce greenhouse gas production and reduce environmental problems.In this paper,building carbon footprint is taken as the research object.Firstly,on the basis of defining the source of building carbon footprint,building carbon footprint is divided into building material mining(production)stage,material transportation stage,main construction stage and construction supporting facilities.According to the source of carbon footprint at different stages,the general model and sub-model]of building carbon footprint calculation are established.Secondly,the measurement factors involved in the model are analyzed,includine carbon footprint factors,material and mechanical consumption,etc.A database of carbon footprint factors is established.Based on BEM technology,a three-dimensional model is established and the engineering quantity is quickly counted.The conversion calculation of consumption is carried out,which provides data basis for the application of the model.Thirdly.ln order to realize the application of the model,the application system is developed based on Delphi.Through the design of the systerm framework,database and BIM interface,the calculation syste.of building carbon footprint is developed,and the fast quantitative calculatiOn of building carbon footprint is real ized.F inally,the model.and system are applied to specific cases.carbon centrntion of buildings in different buildings,dtfferent structures anddifferent building materials of the same building is compared,the following results are abtained the carbon footprint concentration of the frame structure is 417.68kgCO2eq/m2,while the frameshear structure is about 20.5%higher than the frame structure,which is 503.32kgCO2eq/m2,and air-concrete can reduce the total carbon footprint by about 3.6%,in fact,it can reduce the carbon footprint concentration by optimizing the structure and material.By comparing the carbon footprint concentration of different processes in the physical and chemical stage,it is found that building material production(exploitation):material transportation:the main construction proportion is about 90:2:8,the proportion of building material mining(production)is the largest,and the carbon concentration of steel building materials is the highest.So In terms of building material mining(production),carbon concentration can be reduced by improving the recyclability of steel,developing new production technology of materials,or producing new green alternative materials,which can effectively re,duce the carbon concentration in the building stage.This research explores the quantification and application of building carbonization footprint based on BIM,constructs the quantification model of materialization stage,and develops the application system,realizes the rapid quantification research of buildins low carbon,provides relevant basis for architectural design optimization and analysis,and provides reference for green building and sustainable development.