| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize a boiling temperature in a heat pump type water heater. <P>SOLUTION: The heat pump type water heater boils hot and cold water by using a combination of a heat pump cycle 5 and a heater 13, and stores hot water in a hot water storage tank 6. In the heat pump type water heater, the number of revolutions of a circulation pump 12 is reduced when an actual boiling temperature becomes higher than a target boiling temperature, a variation value of the number of revolutions of the circulation pump 12 is increased by a number of revolutions variation value changing means 16f by turning ON the heater 13 when it is determined that the number of revolutions of the circulation pump 12 has reached a lower limit number of revolutions by a number of revolutions changing means 16d and it is determined that a boiling output calculated by a boiling output calculating means 16b is a lower limit boiling output, and it becomes possible to stably boil the hot and cold water by shortening a detection cycle of a second temperature detector 15 detected by the second temperature detector 15 in a cycle changing means 16h. <P>COPYRIGHT: (C)2011,JPO&INPIT |
