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Abstract

An ammonia/COrefrigerating system having a liquid pump for feeding the liquid COcooled in a brine cooler by the utilization of the vaporization latent heat of ammonia in an ammonia refrigeration cycle to a cooler, which comprises a liquid receiving vesselfor receiving a CObrine cooled in a brine cooler, a liquid pumpcapable of changing the rate of the feed of a liquid, a rising pipingprovided between the liquid pumpand a cooler, and a communication pipefor communicating the top of the riser pipewith the COgas phase in the liquid receiving vessel, wherein the discharge pressure of the liquid pumpis set so as for the COrecovered form the cooleror the liquid receiverin the state of a liquid or a gas-liquid mixture, and the level of the rise in the rising pipingis set at a level being the same as or higher than the highest storage level for the CObrine in the liquid receiving vessel. The above ammonia/COrefrigerating system allows a refrigeration cycle of a combination of an ammonia cycle and a COcycle to be formed with no care, even when a refrigerating showcase, which is the cooler side of the COcycle, is installed at an arbitrary place.