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Article | REF: BE9738 V1

Absorption chillers and heat pumps- ammonia-water systems. Technology

Authors: Francis MEUNIER, Pierre Neveu

Publication date: March 10, 2022

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1. NH3-H2O technology

Although they are trithermal absorption systems like water-lithium bromide (H 2 O-LiBr) systems, ammonia-water (NH 3 -H 2 O) systems differ significantly in terms of technology from H 2 O-LiBr cycles for several reasons:

  • the refrigerant is an aqueous solution very rich in ammonia;

  • operating pressure is high and generally higher than atmospheric pressure;

  • the evaporator produces a two-phase liquid-steam mixture;

  • a liquid-vapor exchanger (LVE) is used to subcool the condensate leaving the condenser and to complete the vaporization of the refrigerant coming from the...

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