4
This action dilutes the concentrated
solution back to the same concentration
level as it was when the cycle began.
The dilute solution gathers in the
Absorber sump before being pumped
back into the Generators to start the
cycle anew.
Fig. 1
– DOUBLE-EFFECT ABSORPTION CYCLE
(COOLING)
HEATING OPERATION
High-Temperature Generator
(HGE)
Dilute lithium bromide solution is heated
in the HGE by the gas burner in the
same manner as in the cooling cycle.
The solution boils vigorously, releasing
superheated
refrigerant
vapor
and
leaving a more concentrated solution.
The refrigerant vapor flows through a
changeover valve into the Evaporator
section. The concentrated solution flows
through another changeover valve into
the Absorber sump.
Low-Temperature Generator
(LGE)
Although solution does flow through the
LGE, since the superheated refrigerant
vapor is not flowing in any meaningful
amount through the LGE, the solution
does not release any refrigerant vapor
and the solution simply flows back into
the Absorber sump in essentially a still-
diluted state. The lack of this generator
operation in heating mode is why the
heating capacity is lower than the cooling
capacity in these chiller-heaters.
