Abstract:

To save energy and reduce coal and gas consumption, and reduce emission, the possibility of lowtemperature surface water  heat pump system was studied. Constrained by the temperature of winter surface water, closedtype water  heat pump system was adopted. The system adopts the single stage and double stage coupling operation, after calculated and analyzed system heating efficiency ratio and indicated that the winter water temperature in extreme cases provided 45.0℃ water heat pump, heating system efficiency were greater than 2.6, proved the feasibility of using the low temperature water heating in winter. To single stage and double stage coupling heat pump system at the same time heat pump heating efficiency than the contrast (investigate), determines the low temperature water source heat pump system respectively with 45.0℃ and 50.0℃ hot water of single and double switching condition water temperature of 5.0℃ and 8.0℃.

Key words:

water heat pump, singledoublestage switch, heating efficiency ratio, closedtype system