After that, the absorbate in liquid phase is throttled
to the evaporator at state 4 of which an evaporator pressure (P ) is
lower than that of the condenser. The evaporator is heated at a low
temperature (T ) around 0-20°C and the absorbate in form of vapor
enters the absorber which has the same pressure as the evaporator at
state 5. Meanwhile, liquid mixture from the generator, at state 6 is sent
through a solution heat exchanger at state 7 into the absorber to the low
pressure at state 8 through expansion device.