Heat pump system

Abstract

A heat pump system includes a base refrigeration circuit, a heat accumulator, an auxiliary heat exchanger and an outdoor heat exchanger defrosting and cooling means. In the base refrigeration circuit, a compressor, a four-way valve, an indoor heat exchanger, a cooling expansion valve, a heating expansion valve, an outdoor heat exchanger and the four-way valve are connected in a sequence by a refrigerant conduit. The four-way valve and the compressor are connected by a refrigerant suction conduit. The heat accumulator includes a bypass refrigerant conduit connected to the refrigerant conduit between the cooling and heating expansion valves. The heat accumulator has a heating heat exchanger and is injected with a heat medium. The auxiliary heat exchanger is installed in the outdoor heat exchanger and connected to the heat accumulator by a heat medium supply conduit and a heat medium return conduit. The defrosting and cooling means includes a heat exchanger and a costless heat reservoir.

1 . A heat pump system, comprising:
 a base refrigeration circuit in which a compressor, a four-way valve, an indoor heat exchanger, a cooling expansion valve, a heating expansion valve, an outdoor heat exchanger and the four-way valve are connected in a sequence by a refrigerant conduit, and the four-way valve and the compressor are connected to each other by a refrigerant suction conduit;   a heat accumulator comprising a bypass refrigerant conduit having both ends connected to the refrigerant conduit between the cooling expansion valve and the heating expansion valve, the heat accumulator having therein a heating heat exchanger provided on the bypass refrigerant conduit, with a heat medium injected into the heat accumulator;   an auxiliary heat exchanger connected to the heat accumulator by a heat medium supply conduit provided with a heat medium circulation pump and by a heat medium return conduit, the auxiliary heat exchanger being installed in the outdoor heat exchanger; and   outdoor heat exchanger defrosting and cooling means comprising: a heat exchanger connected to the heat medium supply conduit and to the heat medium return conduit by a brine supply conduit provided with a brine circulation pump and by a brine return conduit; and a costless heat reservoir provided around the heat exchanger.   
     
     
         2 . The heat pump system as set forth in  claim 1 , wherein a costless heat source comprises any one selected from the group consisting of river water, seawater, collected underground water, fluid heated by a solar collector, rainwater and waste water. 
     
     
         3 . The heat pump system as set forth in  claim 1 , wherein a refrigerant suction bypass conduit passes through the heat accumulator, the refrigerant suction bypass conduit being connected to the refrigerant suction conduit, with an endothermic heat exchanger provided on the portion of the refrigerant suction bypass conduit that is placed through the heat accumulator, the endothermic heat exchanger heating refrigerant gas to be sucked into the compressor. 
     
     
         4 . The heat pump system as set forth in  claim 1 , wherein heat pipes of the auxiliary heat exchanger are located between heat pipes of the outdoor heat exchanger at positions spaced apart from each other at regular intervals.