Abstract: An ammonia/CO2 refrigeration system is provided in which the ammonia cycle and CO2 brine cycle can be combined without problems even when refrigeration load such as refrigerating showcase, etc. is located at any place in accordance with circumstances of customer's convenience. The system comprises apparatuses working on an ammonia refrigerating cycle, a brine cooler for cooling and condensing CO2 by utilizing the latent heat of vaporization of the ammonia, and a liquid pump provided in a supply line for supplying the cooled and liquefied CO2 to a refrigeration load side cooler, wherein said liquid pump is a variable-discharge pump for allowing CO2 to be circulated forcibly, and the forced circulation flow is determined so that CO2 is recovered from the outlet of the cooler of the refrigeration load side in a liquid or liquid/gas mixed state.

Abstract: An air shutter of low cost, high efficiency, and easy maintainability is provided, which can interrupt efficiently the flowage of air across a doorway when the door is open based on the consideration of the experimental data of the flowage of air across the opening area of the doorway of a cold storage. The air shutter comprises a gatepost 12 and a gatepost 13 installed at both sides of the opening area of a doorway. The gatepost 12 is provided with a lower slit nozzle 12a, a suction opening 12b, and lower fans 12c and a suction duct 12d inside thereof, on the other hand, the gatepost 13 provided with an upper slit nozzle 13a, a suction opening 13b, and lower fans 13c and a suction duct 13d inside thereof.

Abstract: An ammonia/CO2 refrigerating system having a liquid pump for feeding the liquid CO2 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 CO2 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 CO2 gas phase in the liquid receiving vessel 4, wherein the discharge pressure of the liquid pump 5 is set so as for the CO2 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 CO2 brine in the liquid receiving vessel 4.

Abstract: An ammonia/CO2 refrigerating system having a liquid pump for feeding the liquid CO2 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 CO2 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 CO2 gas phase in the liquid receiving vessel 4, wherein the discharge pressure of the liquid pump 5 is set so as for the CO2 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 CO2 brine in the liquid receiving vessel 4.

Abstract: The object of the invention is to provide an ammonia/CO2 refrigeration system in which the ammonia cycle and CO2 brine cycle can be combined without problems even when refrigeration load such as refrigerating showcase, etc. is located at any place in accordance with circumstances of customer's convenience. The system comprises apparatuses working on an ammonia refrigerating cycle, a brine cooler for cooling and condensing CO2 by utilizing the latent heat of vaporization of the ammonia, and a liquid pump provided in a supply line for supplying the cooled and liquefied CO2 to a refrigeration load side cooler, wherein said liquid pump is a variable-discharge pump for allowing CO2 to be circulated forcibly, and the forced circulation flow is determined so that CO2 is recovered from the outlet of the cooler of the refrigeration load side in a liquid or liquid/gas mixed state.

Abstract: An air shutter of low cost, high efficiency, and easy maintainability is provided, which can interrupt efficiently the flowage of air across a doorway when the door is open based on the consideration of the experimental data of the flowage of air across the opening area of the doorway of a cold storage. The air shutter comprises a gatepost 12 and a gatepost 13 installed at both sides of the opening area of a doorway. The gatepost 12 is provided with a lower slit nozzle 12a, a suction opening 12b, and lower fans 12c and a suction duct 12d inside thereof, on the other hand, the gatepost 13 provided with an upper slit nozzle 13a, a suction opening 13b, and lower fans 13c and a suction duct 13d inside thereof.

Abstract: An air shutter of low cost, high efficiency, and easy maintainability is provided, which can interrupt efficiently the flowage of air across a doorway when the door is open based on the consideration of the experimental data of the flowage of air across the opening area of the doorway of a cold storage. The air shutter comprises a gatepost 12 and a gatepost 13 installed at both sides of the opening area of a doorway. The gatepost 12 is provided with a lower slit nozzle 12a, a suction opening 12b, and lower fans 12c and a suction duct 12d inside thereof, on the other hand, the gatepost 13 provided with an upper slit nozzle 13a, a suction opening 13b, and lower fans 13c and a suction duct 13d inside thereof.

Abstract: An air shutter of low cost, high efficiency, and easy maintainability is provided, which can interrupt efficiently the flowage of air across a doorway when the door is open based on the consideration of the experimental data of the flowage of air across the opening area of the doorway of a cold storage. The air shutter comprises a gatepost 12 and a gatepost 13 installed at both sides of the opening area of a doorway. The gatepost 12 is provided with a lower slit nozzle 12a, a suction opening 12b, and lower fans 12c and a suction duct 12d inside thereof, on the other hand, the gatepost 13 provided with an upper slit nozzle 13a, a suction opening 13b, and lower fans 13c and a suction duct 13d inside thereof.