Thermal storage of carbon dioxide system for power outage

A method comprising:

• removing heat from a first space proximate to a first load using a refrigerant from a flash tank;
• removing heat from a second space proximate to a second load using the refrigerant from the flash tank;
• compressing the refrigerant from the first load using a first compressor;
• compressing the refrigerant from the second load using a second compressor;
• removing heat from the refrigerant using a high side heat exchanger;
• storing the refrigerant from the high side heat exchanger in the flash tank;
• discharging the flash gas from the flash tank;
• when the system does not have power:
• removing heat from the flash gas using a thermal storage tank, thereby condensing the flash gas to a condensed liquid;
• and
• directing the condensed liquid to the flash tank;
• when the system has power:
• directing the refrigerant from the flash tank to the thermal storage tank;
• transferring heat from the thermal storage tank to the refrigerant, thereby heating the refrigerant;
• and
• directing the heated refrigerant from the thermal storage tank to the second compressor.

A system comprising:

• a flash tank configured to:
• store a refrigerant;
• and
• discharge a flash gas;
• a first load configured to use the refrigerant from the flash tank to remove heat from a first space proximate to the first load;
• a second load configured to use the refrigerant from the flash tank to remove heat from a second space proximate to the second load;
• a first compressor configured to compress the refrigerant from the first load;
• and
• a second compressor configured to compress the refrigerant from the second load and the first compressor;
• and
• a thermal storage tank configured, when the system does not have power, to:
• receive the flash gas from the flash tank;
• remove heat from the flash gas, thereby condensing the flash gas to a condensed liquid;
• and
• direct the condensed liquid to the flash tank;
• and
• wherein the thermal storage tank is configured, when the system has power, to:
• receive the refrigerant from the flash tank;
• transfer heat from the thermal storage tank to the refrigerant, thereby heating the refrigerant;
• and
• direct the heated refrigerant to the second compressor.