On an absorption refrigeration plant the mechanical compressor is substituted by a liquid solution circuit.

An additional fluid is needed to absorb the refrigerant gas coming from the evaporator. Using ammonia as refrigerant the best absorbent is water. This water will be enriched with ammonia and is pumped to the desorber or boiler, where a heat source is used to separate ammonia and water by evaporation. As in conventional refrigeration systems the high pressure refrigerant gas is liquified and sent to the evaporator.

In this way thermal energy can be used to create refrigeration.

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