TRANSKRITI CO2 HEAT COOLING COMPOUND SYSTEM

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The system (1) has an evaporator stage comprising parallel evaporators in which liquid carbon dioxide expands to gas phase by extracting heat from environment. Compressor stages (4a-4c) compress and heat the gaseous carbon dioxide. An external cooler (7) emits the heated carbon dioxide to the atmosphere. A downstream collector (10) decompresses and condenses the carbon dioxide. A re-cooler (8) e.g. heat exchanger, and a control valve (9) are arranged between the outdoor cooler and the collector for controlling pressure in a carbon dioxide circuit.