| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of preventing liquid back of a compressor by taking a sufficient degree of superheat by increasing the difference between a temperature of high-pressure refrigerant led out of a water-refrigerant heat exchanger and a temperature of a low-pressure refrigerant led into an internal heat exchanger, and improving reliability by securing hot water supply capacity at all times. <P>SOLUTION: A refrigerating cycle circuit R is constituted by connecting a compressor 1, a first water-refrigerant heat exchanger 2, a second water-refrigerant heat exchanger 4, an expansion valve 6 and an air heat exchanger 7 successively through refrigerant pipes Pa and connected with the internal heat exchanger 5, and a water cycle circuit H is constituted by connecting a pump 13, the second water-refrigerant heat exchanger 4, the first water-refrigerant heat exchanger 2 and a hot water storage tank 12 through water pipes Pc, and allowing a refrigerant led out of the first water-refrigerant heat exchanger 2 to exchange heat with the water before led into the second water-refrigerant heat exchanger in the water cycle circuit by a third water-refrigerant heat exchanger 10. <P>COPYRIGHT: (C)2009,JPO&INPIT |
