| 摘要 |
The present invention relates to a heat pump system, and more specifically, to a defrosting and cooling structure of an outdoor heat exchanger of an air heat source type heat pump system, for increasing the efficiency of use of a costless heat source and enhancing the performance coefficient thereof to a satisfactory level, when circulating a costless heat source and a heat-exchanged heat medium to the outdoor heat exchanger. The present invention comprises: a basic freeze cycle (10) having a compressor (11), a 4-way valve (12), an indoor heat exchanger (13), an expansion valve for cooling (14), an expansion valve for heating (15), an outdoor heat exchanger (16), and the 4-way valve (12), connected with a refrigerant suction pipe (18) in the respective order; a defrosting and cooling means (20) for mounting an auxiliary heat exchanger (22) on the outdoor heat exchanger, and for mounting a heat exchanger (21) on a costless heat source storage tank (23) so that the auxiliary heat exchanger (22) and the heat exchanger (21) are connected to a circulation pump (25) attached a heat medium supply pipe (24a) and a heat medium return pipe (24b), so as to form a closed circuit; and performance enhancing means (30) mounted at the heat medium supply pipe (24a) and between the outdoor heat exchanger (16) and the 4-way valve (12) of a refrigerant conduit (17). |
