| 摘要 |
<P>PROBLEM TO BE SOLVED: To inexpensively provide a heat pump type water heater improved in reliability and high in efficiency. <P>SOLUTION: The heat pump type water heater comprises a refrigerant circuit connecting a compressor, a gas cooler, an internal heat exchanger 6, a first expansion valve and an evaporator annularly, and a water circuit supplying a hot water storage tank with water for hot water supply by a pump after passing through the gas cooler. The internal heat exchanger 6 has high pressure side refrigerant piping 11 and low pressure side refrigerant piping 12. The high pressure side refrigerant piping 11 and the low pressure side refrigerant piping 12 are thermally joined in a longitudinal direction by solder 13, and both ends of the continuous solder 13 are subjected to copper brazing using copper brazing filler metal 14 in a post-process of soldering. <P>COPYRIGHT: (C)2008,JPO&INPIT |
