Patent ID: 7104079

Claim:
A heat pump apparatus having a refrigerating cycle, comprising: a compressor; a gas cooler; a pressure reducing device; an evaporator; a radiator arranged between the exit of said gas cooler and said pressure reducing device, wherein the gas cooler carries out heat exchange between refrigerant discharged from the compressor and water to heat the water, the radiator carries out heat exchange between the refrigerant from the gas cooler and air, and refrigerant working in a supercritical area is filled and used at a high-pressure side in the refrigerating cycle; and a defrosting mechanism comprising a bypass passage through which the refrigerant from the compressor bypasses the gas cooler and flows to the evaporator, and refrigerant flow passage switching means for controlling the flow of the refrigerant to the bypass passage, wherein both said evaporator and said radiator have a fin tube structure, wherein said radiator is constructed by a part of a refrigerant pipe extending from said gas cooler to said pressure reducing device, and wherein said radiator is disposed at the lower portion of said evaporator.