During their life cycle, buildings not only consume a lot of resources
and energy, but also produce a large amount of carbon emissions, which have a
serious impact on the environment. In the context of global emissions
reduction, the trend has been to low carbon buildings. As a major carbon
emitting country, it is urgent to promote emission reduction in the
construction industry and to establish a model for carbon emissions and
calculation in buildings. To this end, this paper collates life cycle carbon
emission calculation methods based on life cycle theory and establishes a mixed
life cycle carbon emission calculation model for buildings to provide ideas for
low carbon buildings in China. A case study of a hospital in Guangming City,
Anhui Province is also conducted to verify the feasibility of the model. The
results show that the total carbon emission of the hospital is 43283.66 tCO2eq,
with the production phase, construction phase, use and maintenance phase and
end-of-life phase accounting for 9.13%, 0.35%, 90.06% and 0.46% of the total
carbon emission respectively. An analysis of the factors influencing carbon
emissions at each stage is presented, and recommendations are given for
corresponding emission reduction measures. The carbon emission calculation
model based on the hybrid LCA proposed in this study enables a more
comprehensive consideration of carbon emissions in the life cycle of a
building, and has implications for the study of building carbon emission
calculation.
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