METHOD OF DEFROSTING FOR BRINE COOLING SYSTEM

摘要

PROBLEM TO BE SOLVED: To shorten defrosting operation time without relying on a defrosting heater by supplying a part of a high-temperature refrigerant and brine discharged from a compressor to a refrigerator as hot brine. SOLUTION: In a brine circuit 20, a brine cooled by a refrigerant is primarily stored in a low-temperature tank 21, flows out therefrom into a brine supply channel 25 and cools a refrigerator 41 for a show-case 40 by way of a show-case circulation pump 22 to cool the inside of the show-case 40 at a predetermined temperature. Brine raised in temperature by heat exchange in the refrigerator 41 is recovered to an intermediate-temperature tank 23 through a brine recovering circuit 26, and returned to a brine refrigerating flow path 15b for a cooling heat exchanger 15 by a heat exchange circulation pump 24. In a hot brine circuit 30, brine stored in a hot tank 31 is heated by a high- temperature refrigerant flowing through a heating flow path 31a.