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14 TRG-TRC011-EN
notes
period one
Absorption Refrigeration Cycle
As the lithium bromide solution absorbs the refrigerant, it becomes diluted and
has less ability to absorb water vapor. To complete the cycle and sustain
operation, the absorbent solution must be reconcentrated. Consequently, the
generator pump continuously returns the dilute solution to the generator to
again separate the refrigerant vapor from the solution and reconcentrate the
solution, thus repeating the cycle.
This cool dilute solution that is pumped from the absorber to the generator, and
the hot concentrated solution returning from the generator, pass through a
heat exchanger. This transfer of heat preheats the dilute solution, reducing the
heat energy required to boil the refrigerant within the generator, and also
precools the concentrated solution, reducing the required flow rate of cooling
water through the absorber.
Notice that in this example cycle, the cooling water passes through the
condenser after passing through the absorber. Some absorption chiller designs
split the cooling water and deliver it directly to both the absorber and the
condenser.
generator pump
generator pump
dilute
dilute
solution
solution
heat
heat
exchanger
exchanger
concentrated
concentrated
solution
solution
Figure 17