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10 TRG-TRC011-EN
notes
period one
Absorption Refrigeration Cycle
Starting on the high-pressure side of the cycle, the purpose of the generator is
to deliver the refrigerant vapor to the rest of the system. It accomplishes this by
separating the water (refrigerant) from the lithium bromide-and-water solution.
In the generator, a high-temperature energy source, typically steam or hot
water, flows through tubes that are immersed in a dilute solution of refrigerant
and absorbent. The solution absorbs heat from the warmer steam or water,
causing the refrigerant to boil (vaporize) and separate from the absorbent
solution. As the refrigerant is boiled away, or “generated,” the absorbent
solution becomes more concentrated.
The concentrated absorbent solution returns to the absorber and the refrigerant
vapor migrates to the cooler condenser. Physically, the generator and
condenser are contained inside of the same shell. The pressure in the
condenser section is less than the pressure in the generator section. This is
because the temperature of the cooling water flowing through the tubes of the
condenser is less than the temperature of the steam or hot water flowing
through the tubes of the generator.
steam or
steam or
hot water
hot water
dilute
dilute
solution
solution
refrigerant
refrigerant
vapor
vapor
concentrated
concentrated
solution
solution
generator
generator
Figure 12