ICE STORAGE APPARATUS

PROBLEM TO BE SOLVED: To divide into sections completely a line between the air-conditioning load on the secondary side and an ice-storage tank by use of one unit of water/water heat exchanger and make it unnecessary to total the capacities as specified by the regulations for the control of high pressure gases by providing a refrigerant/cold water heat exchanger and a water/water heat exchanger in series. SOLUTION: A cold water line 74 constitutes a water path in which iced water is drawn out from the bottom side of an ice-storage tank 68 by a thawing pump 75, and through a water/water heat exchanger 76 and a refrigerant/water heat exchanger 77 the water is returned to the ice storage tank 68 through spray nozzles 71 or a cold water follow-up mode water conduit 78. To the water/water heat exchanger 76 a secondary side water conduit 79 is connected, which has a primary cold water pump 80 for sending cold water on the side of air-conditioning load. With the ice-thawing and cold water follow-up systems disposed in series, the water, subsequent to its heat exchange with the air-conditioning load, can be returned to the ice storage tank 68. By interposing the water/water heat exchanger 76 the cold water drawn out of the ice storage tank 68 can cut off the relationship with the secondary side water conduit 79. By employing this method in calculation of capacities of heat source machines according to High Pressure Gas Control Low, adding-up is exempted.