Figure 10-21.-Basic absorption cycle.known as a WEAK solution. Here, in the generatorsection of the plant, the weak solution is rejuvenated forreuse as a STRONG solution. The generator pumppumps the weak solution from the weak solution sectionof the absorber up to the generator.In the generator, the weak lithium bromide solutionis sprayed out over steam tubes that heat the solution anddrive the water vapor out of the solution. The strongsolution thus produced flows back into the absorber forreuse. The water vapor driven out of the solution flowsfrom the generator into the condenser where it iscondensed by circulating seawater for reuse as arefrigerant. The condensed vapor flows into theevaporator and down to the refrigerant tray.A regenerative heat exchanger is provided in thesystem for the lithium bromide solution. The weaksolution must be heated to drive out the water vapor; thestrong solution must be cooled to absorb water vapor.The regenerative heat exchanger aids in this process bycooling the strong solution and preheating the weaksolution in the cycle.Seawater (condensing) flow is provided through theabsorber section. It cools the strong solution returningfrom the generator and removes the heat produced as thelithium bromide solution absorbs the water vapor. Theoutlet seawater from the absorber is the inlet water forthe condenser.The absorber pump and the generator pump aredriven by a common electric motor. Therefore, the twopumps are referred to cumulatively as theabsorber/generator pump.A purge system (not shown) consists of a pump, aneductor, and a purge tank. The system is provided withthe lithium bromide absorption system to keep air andnoncondensables out of the evaporator/absorber shell.10-23
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