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60 TRG-TRC011-EN
notes
We will now review the main concepts that were covered in this clinic on
absorption water chillers.
Period One presented the basic single-effect, absorption refrigeration cycle. In
the generator, dilute solution absorbs heat from the steam or hot water
flowing through the tubes, causing the refrigerant to boil and separate from the
absorbent solution. As the refrigerant boils away, the absorbent solution
becomes concentrated and returns to the absorber. The resulting refrigerant
vapor migrates to the cooler condenser, where heat transfers from the hot
refrigerant vapor to the cooling water inside the tubes, causing the refrigerant
to condense on the tube surfaces. The resulting condensed liquid refrigerant
flows through an expansion device, causing a pressure drop that reduces the
refrigerant pressure to that of the evaporator. This pressure reduction causes a
small portion of the liquid refrigerant to boil off, cooling the remaining
refrigerant to the desired evaporator temperature. The cooled mixture of liquid
period six
Figure 68
condenser
condenser
generator
generator
evaporator
evaporator
absorber
absorber
heat
heat
exchanger
exchanger
expansion
expansion
device
device
chilled
chilled
water
water
cooling
cooling
water
water
steam or
steam or
hot water
hot water
Figure 69
period six
Review