One refrigerant CO2 has a properties description that covers both subcritical and supercritical conditions. This medium can therefore handle plants operating subcritically, transcritically and supercritically.

The following FrigoSim models may operate supercritically:

1. Gas cooler
2. Superheat exchanger

The following FrigoSim models may operate transcritically, that is with the upper pressure side in the supercritical domain:

1. All compressors models
2. Suction gas heat exchanger
3. Closed flash chamber with 4 ports

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