RACA Journal August 2025 RACA_August2025 | Seite 43

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High pressure

• Subcritical system: up to 45 bar( 4,500 kPa)

• Transcritical system: up to 120 bar( 12,000 kPa)

• Medium pressure( of a)

• Transcritical system: up to 90 bar( 9,000 kPa)

Low pressure

• Subcritical system: 6.4 to 35 bar

• Transcritical system

• With medium pressure receiver: up to 35 bar( 3,500 kPa)

• Without medium pressure receiver: up to 90 bar( 9,000 kPa)

Above the critical temperature of 31 ° C, liquefaction of the CO2 is no longer possible. Instead of a condenser in the standard process, the supercritical( transcritical) process has a gas cooler.

Cayla, let us look at the expected pressures found in the various systems:

Cayla, as you can see there are differences to be found when dealing with CO2 systems. In the next issue I will explain more about the workings of CO2 systems. RACA