Research on Measurement and Calculation of Carbon Emission from the Production of Prefabricated Building Components

The measurement and calculation of the carbon emission from the production of prefabricated building components were studied. Based on the carbon emission factor method, a carbon emission calculation model of the components in the production phase was established. Besides, the actual measurement method and calculated at rated power method were proposed for the measurement and calculation of carbon emission, and several measurements were carried out in a component factory located in a coastal area of south China and a component factory located in Beijing, respectively. The results of the study show that the carbon emission factors of laminates and wallboards produced by factories located in coastal areas of southern China under natural curing conditions were 7.61 kg CO₂/m³ and 5.84 kg CO₂/m³ respectively. The carbon emissions conversion coefficients of concrete mixer, reinforcing bar production line and travelling crane between actual operation and with per the rated power were approximately 0.44, 0.34 and 0.34 respectively. When the actual measurement cannot be performed, the conversion coefficient can be used to correct the data of the calculated at rated power to make it closer to the true value. The carbon emission factor of the laminated panels produced by the component factory in Beijing under steam curing concrete conditions was 132.15 kg CO₂/m³, and the factory is used as a prototype, a complementary steam generation system model of solar energy and boiler was established, and it was calculated that the system can reduce CO₂ emissions by about 300 tons throughout the year.