Current cooling systems in fridges, freezers, shop display counters and air conditioning, etc., are mainly based on gas compression technology. The coolant is pressed together with a compressor and is significantly warmer than the surrounding temperature. The excess heat is discharged into the outside environment via refrigeration coils and the coolant is then released anew. This causes the temperature to drop well below the initial value. To this day, gas compression appliances use fluorinated gas as a coolant. They will no longer be allowed to be used in the EU from 2030 onward at the latest. Newer systems use natural gases that are either explosive, highly flammable or toxic. Aside from that, their aggregates are often noisy and maintenance-intensive.

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About the author

Author profile picture Volker Joksch, freelance writer and corporate communications specialist. Lives in Munich.