NH3-H2O technology
Absorption chillers and heat pumps- ammonia-water systems. Technology

Although they are trithermal absorption systems like water-lithium bromide (H₂O-LiBr) systems, ammonia-water (NH₃-H₂O) systems differ significantly in terms of technology from H₂O-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 evaporator, and possibly to superheat the vapor produced;

• the various components are located individually in hermetically sealed enclosures, unlike the H₂O-LiBr case, which featured only two enclosures...