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CO2 gas coolers replace traditional air-cooled condensers in refrigerating systems designed for the use of carbon dioxide as a single refrigerant. In a gas cooler, hot compressed CO2 gas flows through the cooler tubes and is cooled down by the ambient air that is forced through the coil. The refrigerant gas is not liquefied in the gas cooler, but later on in the expansion valve. Air cooled gas coolers operate with considerably higher pressures than air cooled condensers.