| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed water warming system using a heat pump, in which the heat pump is efficiently operated.SOLUTION: To a feed water tank, water can be fed through a water feed path via a condenser of a heat pump and, at the same time, water can be fed through a water replenishment path not through the condenser. When the water level of the feed water tank falls below a first water level H1, water is fed to the feed water tank via the water feed path while performing a low-load operation of the heat pump, when the water level falls below a switching water level H1' lower than the first water level, water is fed to the feed water tank via the water feed path while performing a high-load operation of the heat pump and, when exceeding a second water level H2 higher than the first water level, water feed is stopped. When the water level falls below a third water level H3 lower than the switching water level, water feed to the feed water tank via the water replenishment path is performed and, meanwhile, when the water level exceeds a fourth water level H4 higher than the third water level, the water feed is stopped. The flowing volume of water to the condenser is preferably adjusted such that an output side water temperature of the condenser of the heat pump is maintained at the set temperature during the water feed to the feed water tank via the water feed path. |
