Patent ID: 9726411
Date: 2017-08-08
CPC Classifications: F25B

Claim:
1. A refrigeration system using a flow of a carbon dioxide refrigerant, comprising: a flash tank; a plurality of temperature suction compressors for a temperature suction cycle, wherein the plurality of temperature suction compressors receive the flow of carbon dioxide refrigerant from an evaporator; a vapor line; a suction line; a flash gas bypass system positioned between the flash tank and the plurality of temperature suction compressors; the flash gas bypass system comprises one or more oversized flash gas compressors; wherein the one or more oversized flash gas compressors alternate between the temperature suction cycle and a flash tank suction cycle, and the one or more oversized flash gas compressors in the temperature suction cycle receive carbon dioxide refrigerant from the flow of carbon dioxide from the evaporator to the plurality of temperature suction compressors; a first port valve on the vapor line and upstream of the one or more oversized flash gas compressors; and a second port valve on the suction line and upstream of the one or more oversized flash gas compressors, wherein the one or more oversized flash gas compressors are in the temperature suction cycle when the first port valve is closed and the second port valve is open, and the one or more oversized flash gas compressors are in flash tank cycle when the first port valve is open and the second port valve is closed.