| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of minimizing the enlargement of a device size and an increase of cost to obtain an instantaneous high heating capacity in an instantaneous hot water supply operation. <P>SOLUTION: This heat pump type water heater comprises a CO<SB>2</SB>cycle 1 for circulating a CO<SB>2</SB>refrigerant, and a R410A cycle 2 for circulating a R410A refrigerant having compressibility lower than the CO<SB>2</SB>refrigerant. The CO<SB>2</SB>cycle 1 is operated in executing a hot water storing operation for storing hot water heated by a water heat exchanger 32 exchanging heat between the CO<SB>2</SB>refrigerant or R410A refrigerant and the water, in a hot water storage tank 31, and the R410A cycle 2 is operated in executing the instantaneous hot water supply operation for supplying the hot water heated by the water heat exchanger 32 from a prescribed hot water supply port. <P>COPYRIGHT: (C)2008,JPO&INPIT |
