| 摘要 |
An ammonia/CO 2 refrigerating system having a liquid pump for feeding the liquid CO 2 cooled 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 vessel 4 for receiving a CO 2 brine cooled in a brine cooler 3, a liquid pump 5 capable of changing the rate of the feed of a liquid, a rising piping 90 provided between the liquid pump 5 and a cooler 6, and a communication pipe 100 for communicating the top of the riser pipe 90 with the CO 2 gas phase in the liquid receiving vessel 4, wherein the discharge pressure of the liquid pump 5 is set so as for the CO 2 recovered form the cooler 3 or the liquid receiver 4 in the state of a liquid or a gas-liquid mixture, and the level of the rise in the rising piping 90 is set at a level being the same as or higher than the highest storage level for the CO 2 brine in the liquid receiving vessel4. The above ammonia/CO 2 refrigerating system allows a refrigeration cycle of a combination of an ammonia cycle and a CO 2 cycle to be formed with no care, even when a refrigerating showcase, which is the cooler side of the CO 2 cycle, is installed at an arbitrary place.
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