Patent ID: 8839636
Filing Date: 2014-09-23
Classification: F24D,F24H,F25B

Abstract:
1. A heat pump water heater having a refrigerant circuit and a water circuit thermally connected through a refrigerant-water heat exchanger that performs heat exchange between a refrigerant and water, wherein said refrigerant circuit includes a compressor, a four-way valve, said refrigerant-water heat exchanger, expanding means, and a refrigerant-air heat exchanger, forms a water heating circuit composed by sequentially connecting said compressor, said four-way valve, said refrigerant-water heat exchanger, said expanding means, said refrigerant-air heat exchanger, and said four-way valve, and forms a defrosting operation circuit composed by sequentially connecting said compressor, said four-way valve, said refrigerant-air heat exchanger, said expanding means, said refrigerant-water heat exchanger, and said four-way valve by switching of said four-way valve; said water circuit includes a water inlet pipeline communicating with said refrigerant-water heat exchanger, a water circulating device, a bypass three-way valve, a water tank, and a hot water tank sequentially installed in said water inlet pipeline from the upstream side to the downstream side, the hot water tank, a water outlet pipeline that allows the hot water tank to communicate with said refrigerant-water heat exchanger, a water tank three-way valve installed in the water outlet pipeline, a water tank pipeline that allows one of inlets/outlets of the water tank three-way valve to communicate with said water tank, a water tank water circulating device installed in the water tank pipeline, and a bypass pipeline that allows one of inlets/outlets of said bypass three-way valve, said water tank three-way valve of said water outlet pipeline, and said hot water tank to communicate with each other; said water circuit is configured to directly enter water having passed through said water inlet pipeline into either said hot water tank or the water tank via said bypass three-way valve; when said water heating circuit is formed, in said refrigerant circuit, warm heat is delivered to water that flowed into said refrigerant-water heat exchanger from the refrigerant flowing through said refrigerant-water heat exchanger; in said water circuit, the water having passed through said water inlet pipeline flows into said refrigerant-water heat exchanger via the water tank and is heated and then, directly flows into said hot water tank; when said defrosting operation circuit is formed, in said refrigerant circuit, after defrosting of said refrigerant-air heat exchanger, the refrigerant having passed through said expanding means receives warm heat from water that flowed into said refrigerant-water heat exchanger and returns to said compressor; and in said water circuit, inflow of water from said water inlet pipeline to the water tank and said hot water tank is stopped, and in said refrigerant-water heat exchanger, the water which has delivered warm heat to the refrigerant flows from one of inlets/outlets of said water tank three-way valve to said water tank through said water tank pipeline and then, returns to said refrigerant-water heat exchanger through said water inlet pipeline; and said water which has delivered warm heat to the refrigerant in said refrigerant-water heat exchanger is stopped flowing into said hot water tank.