HIGH TEMPERATURE CASCADE HEAT PUMP SYSTEM WITH DOUBLE MEDIUM AND LOW TEMPERATURE HEAT SOURCES

In response to the call for carbon neutrality and control of CO2 emission, this paper proposes a high temperature cascade heat pump system with double medi-um and low temperature heat sources. Compared with those with a single heat source, the new system has obvious advantages in energy saving and carbon emission. An experiment is designed where the temperature of medium tempera-ture heat source keeps unchanged, revealing that, compared with a single low temperature heat source, the heating capacity of low temperature heat source re-duces by 2.9%, the heating capacity of medium temperature heat source increas-es by 31.1%, the total power consumption of the heat pump increases by 3%, and the heating capacity of the heat pump increases by 4.3%.