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28 TRG-TRC011-EN
notes
period two
Absorption Chiller Types
separate from the absorbent solution. As the refrigerant boils away, the
solution becomes concentrated and returns to the absorber.
The hot refrigerant vapor produced in the high-temperature generator migrates
to the low-temperature generator where it flows through the tubes that are
immersed in a dilute solution. The solution absorbs heat from the high-
temperature refrigerant vapor, causing the refrigerant in the low-temperature
generator to boil and separate from the absorbent solution. As that refrigerant
boils away, the concentration of the solution increases and it returns to the
absorber.
The low-temperature refrigerant vapor produced in the low-temperature
generator migrates to the cooler condenser. Additionally, the liquid refrigerant
that condensed inside the tubes of the low-temperature generator flows into
the condenser.
Next, the refrigerant travels through the condenser, expansion device,
evaporator, and absorber in a manner similar to refrigerant travel in the
indirect-fired double-effect absorption chiller.
The low-temperature generator pump returns the dilute absorbent solution
to the low-temperature generator to be reconcentrated. This cool dilute solution
passes through the low-temperature heat exchanger to be preheated by the
hot concentrated solution returning from the two generators.
condenser
condenser
low
low
-
-
temperature
temperature
generator
generator
evaporator
evaporator
absorber
absorber
expansion
expansion
device
device
low
low
-
-
temperature
temperature
heat exchanger
heat exchanger
evaporator spray pump
evaporator spray pump
low
low
-
-
temperature
temperature
generator pump
generator pump
absorber
absorber
spray pump
spray pump
chilled
chilled
water
water
cooling
cooling
water
water
Figure 33