6. Refrigerant expansion systems

The refrigerant is generally supplied to the vicinity of the evaporators or liquid separators under pressure ( p _am ), in the liquid state, subcooled or not by a distribution system (see [BE 9 743] ), which may contain at least one of the circuits below:

• a high-pressure liquid circuit from the condenser;

• a medium-pressure circuit from an intermediate stage;

• a low-pressure circuit with natural circulation (thermosiphon);

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