period one
Absorption Refrigeration Cycle
notes
concentrated |
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solution |
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heat |
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exchanger |
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dilute |
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solution | Figure 17 |
generator pump |
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.
14 |
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