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Lithium Bromide Absorption Unit
SELF-CONTAINED  AIR  CONDITIONERS

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Figure  10-21.-Basic  absorption  cycle. known as a WEAK solution. Here, in the generator section of the plant, the weak solution is rejuvenated for reuse  as  a  STRONG  solution.  The  generator  pump pumps the weak solution from the weak solution section of the absorber up to the generator. In the generator, the weak lithium bromide solution is sprayed out over steam tubes that heat the solution and drive the water vapor out of the solution. The strong solution thus produced flows back into the absorber for reuse. The water vapor driven out of the solution flows from  the  generator  into  the  condenser  where  it  is condensed  by  circulating  seawater  for  reuse  as  a refrigerant.   The   condensed   vapor   flows   into   the evaporator and down to the refrigerant tray. A regenerative heat exchanger is provided in the system  for  the  lithium  bromide  solution.  The  weak solution must be heated to drive out the water vapor; the strong  solution  must  be  cooled  to  absorb  water  vapor. The regenerative heat exchanger aids in this process by cooling the strong solution and preheating the weak solution in the cycle. Seawater  (condensing)  flow  is  provided  through  the absorber section. It cools the strong solution returning from the generator and removes the heat produced as the lithium bromide solution absorbs the water vapor. The outlet seawater from the absorber is the inlet water for the  condenser. The absorber pump and the generator pump are driven by a common electric motor. Therefore, the two pumps   are   referred   to   cumulatively   as   the absorber/generator   pump. A purge system (not shown) consists of a pump, an eductor, and a purge tank. The system is provided with the lithium bromide absorption system to keep air and noncondensables  out  of  the  evaporator/absorber  shell. 10-23






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