Patent ID: 8720214

Claim:
An ice rink cooling facility: a cooling passage pipe bank comprising a plurality of cooling passage pipes is arranged at the bottom part of the ice rink and CO 2 brine streams through the passages of the cooling passage pipe bank so as to cool the ice rink, wherein the cooling-passage pipe bank is arranged at the bottom part of the ice rink, the straight line part of each cooling cooling-passage pipe being parallel to the straight part of the adjacent cooling-passage pipe; an ammonia refrigerating cycle in which an ammonia refrigerant circulates; and a cascade condenser in which the heat exchange is performed between the CO 2 brine and the ammonia refrigerant so that the CO 2 brine is cooled and re-liquefied by use of the ammonia refrigerant, wherein the ammonia refrigerating cycle comprises: a main refrigerator that is used for manufacturing the ice for the ice rink; an auxiliary refrigerator that is connected to the main refrigerator in parallel and used for preventing the pressure of the CO 2 brine from increasing; and wherein the main refrigerator is operated when the ice of the ice rink is formed, whereas the auxiliary refrigerator is operated instead of the main refrigerator except when the ice of the ice rink is formed.