Cooling system

Abstract

A cooling system according to at least one embodiment is provided with: an NH 3 refrigeration machine installed on a rooftop of a building and including a refrigeration cycle through which an NH 3 refrigerant circulates; a CO 2 liquefaction unit installed on the rooftop and including a heat exchanger for liquefying a CO 2 refrigerant through heat exchange with the NH 3 refrigerant, and a CO 2 receiver for storing the CO 2 refrigerant liquefied by the heat exchanger; a casing installed on the rooftop and housing at least the CO 2 liquefaction unit; and an air cooler installed outside the casing on the rooftop and configured to generate cold air supplied to a refrigerator in the building through heat exchange with the CO 2 refrigerant from the CO 2 liquefaction unit.

1 . A cooling system, comprising:
 an NH 3  refrigeration machine installed on a rooftop of a building and including a refrigeration cycle through which an NH 3  refrigerant circulates;   a CO 2  liquefaction unit installed on the rooftop and including a heat exchanger for liquefying a CO 2  refrigerant through heat exchange with the NH 3  refrigerant, and a CO 2  receiver for storing the CO 2  refrigerant liquefied by the heat exchanger;   a casing installed on the rooftop and housing at least the CO 2  liquefaction unit; and   an air cooler installed outside the casing on the rooftop and configured to generate cold air supplied to a refrigerator in the building through heat exchange with the CO 2  refrigerant from the CO 2  liquefaction unit,   wherein the casing includes a first barrier wall through which a CO 2  pipe between the CO 2  liquefaction unit and the air cooler passes and which prevents leakage of the NH 3  refrigerant from inside of the casing to the air cooler.   
     
     
         2 . The cooling system according to  claim 1 ,
 wherein the casing houses the CO 2  liquefaction unit and the NH 3  refrigeration machine,   wherein the NH 3  refrigeration machine includes a condenser disposed in the casing and configured to cool and condense the NH 3  refrigerant through heat exchange with a cooling medium,   wherein the cooling system comprises a heat dissipation device installed outside the casing, connected to the condenser via a cooling medium pipe, and configured to cool the cooling medium supplied via the cooling medium pipe,   wherein the casing includes a second barrier wall through which the cooling medium pipe passes and which prevents leakage of the NH 3  refrigerant from inside of the casing to outside of the casing.   
     
     
         3 . The cooling system according to  claim 1 ,
 wherein the air cooler includes:
 an inlet through which return air from the refrigerator enters; 
 a cooling tube bundle for obtaining the cold air by cooling the return air through heat exchange with the CO 2  refrigerant; and 
 an outlet through which the cold air is discharged, 
   wherein the cooling system comprises:
 a first hood connecting a first opening provided on a floor surface of the rooftop so as to communicate with the refrigerator to the outlet of the air cooler; and 
 a second hood connecting a second opening provided on the floor surface of the rooftop so as to communicate with the refrigerator to the inlet of the air cooler. 
   
     
     
         4 . The cooling system according to  claim 3 , comprising:
 an openable first damper disposed in the first hood; and   an openable second damper disposed in the second hood.   
     
     
         5 . The cooling system according to  claim 1 ,
 wherein the air cooler includes:
 an inlet through which return air from the refrigerator enters; 
 a cooling tube bundle for obtaining the cold air by cooling the return air through heat exchange with the CO 2  refrigerant; and 
 an outlet through which the cold air is discharged, 
   wherein the cooling system comprises:
 a first damper capable of blocking the outlet of the air cooler or a first opening provided on a floor surface of the rooftop so as to communicate with the refrigerator and allowing the cold air to pass; and 
 a second damper capable of blocking the inlet of the air cooler or a second opening provided on the floor surface of the rooftop so as to communicate with the refrigerator and allowing the return air to pass. 
   
     
     
         6 . The cooling system according to  claim 1 , comprising
 a liquid pump for sending the CO 2  refrigerant in a liquid phase within the CO 2  receiver to the air cooler.   
     
     
         7 . The cooling system according to  claim 1 ,
 wherein the CO 2  receiver is placed at a position higher than the air cooler, and   wherein the CO 2  refrigerant in a liquid phase within the CO 2  receiver can be supplied to the air cooler by its own weight.   
     
     
         8 . The cooling system according to  claim 1 , comprising
 a removal device for removing NH 3  gas that has leaked in the casing.