Methods And Mechanism Of Correlation Between Building Embodied Carbon Emissions And Technological Progress

Building embodied carbon emissions account for an increasing proportion of the total carbon emissions in the building life cycle.Meanwhile,annual building embodied carbon emissions reduction has also become an important breakthrough in the national total carbon emissions reduction.The energy-saving and emission-reducing effects of technological progress have aroused widespread concern in many industries and will also become an important way to reduce the embodied carbon emissions from buildings.Because building embodied carbon emissions involve the carbon emissions from multiple related sectors,the technological progress of different sectors will have impacts on building embodied carbon emissions.Therefore,there is complex relationships between technological progress and building embodied carbon emissions.At present,in the field of construction and building,there is a lack of systematic research to explore and analyze the correlation mechanism of technological progress on building embodied carbon emission reduction in an economic system in which multiple sectors coexist from the perspective of the national economy.According to the concept of building embodied carbon emissions,the related sectorss can be divided into two categories,one is the construction industry where all economic activity's carbon emissions belong to the building embodied carbon emission,and the other is that in theindustry carbon emissions from some economic activity belong to the building carbon embodied emission.For the construction industry,the production function of energy efficiency in construction industry and technological progress is constructed,which reveals the impact of technological progress on the energy efficiency in the construction industry;through literature research and expert interviews,the influencing factors of energy efficiency are identified,and mathematical statistics are used to verify the effectiveness of the influencing factors.For therelated sectors,social accounting matrice was compiled that highlight the related sectorss,energy-saving technical parameters was introduced and a dynamic CGE model of multi-sector energysaving technologies was built;the ones that have the greater impact of industry are choosen to set up four different scenarios on energy-saving scenarios on building embodied carbon emissions;through simulation and analysis,the differences between related sectors in economy,industrial structure,energy consumption and carbon emissions are compared with the benchmark scenarios;quantitatively the mechanism relationship of related sector emission reduction rates and building embodied carbon emissions,through empirical research to simulate the impacts of energy-saving technological progress on building emboied carbon emission reductions under four scenarios,and verify the applicability of the CGE model.The main conclusions of the research incluede: 1)by means of the production function,technological progress improves the energy efficiency of the construction industry at a rate of 7% per year;2)statistical results show that: energy use efficiency of machinery and equipment in the construction industry and energy structure changes significantly affect the energy efficiency of the construction industry,the effects of R&D input is not significant;3)dynamic CGE simulation results show that: the energy consumption change rate,energy consumption intensity change rate,carbon emissions change rate,and carbon emission intensity change rate o of the related industries(construction industry,steel/cement industry,energy industries,etc.)on building embodied carbon emissions in different years;4)to formulate the correlation mechanism of energy-saving technological progress and building embodied carbon emission reduction in related sectors,and indetify the applicable scope of the formula;5)to conduct an empirical research on the annual embodied carbon emissions of civil buildings,simulateand conclude that the reduction rates of embodied carbon emissions are: 29.2%,(-1)%,28.7% and 30.88%,respectively,under the four scenarios.This research quantifies the correlation mechanism of technological progress from both the construction industry and multi-sector on annual building embodied carbon emission reduction from the macro perspective of the industry,and provides a new perspective and method for the implementation of energy conservation and emission reduction in the construction and building field.