Design of cooling and heating sources of HVAC system is one of the main parts of green buildingdesign, as well as one of key measures to improve building energy efficiency and reduce environmentalimpact. In this paper, a LCA model for building cooling and heating source system is put forward and anintegrated index is given to describe the total environmental impact including energy consumption,resources consumption and pollutant emission through building life, in order to guide the design ofbuilding energy system.
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