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42 TRG-TRC010-EN
notes
period five
Application Considerations
Heat Recovery
Salvaging usable heat from the refrigeration cycle—heat that would normally
be rejected to the atmosphere—can significantly reduce the operating costs of
many buildings.
Heat recovery is most commonly accomplished using 2 condensers and the fact
that hot refrigerant vapor migrates to the area with the lowest temperature.
Raising the refrigerant condensing temperature in the standard condenser
prompts the refrigerant to flow instead to the second condenser, where it
rejects its heat to the water flowing through the tubes. The condensing
temperature in the standard condenser is controlled by varying the temperature
or the flow rate of the cooling tower water.
Typical uses for the hot water from the second condenser include: heat for
spaces around the perimeter of the building, reheat coils in air conditioning
systems, and bathroom, laundry, or kitchen requirements. Any building with a
simultaneous heating and cooling load is a potential candidate for heat
recovery.
Heat Recovery
heat-recovery
heat-recovery
condenser
condenser
cooling
cooling
tower
tower
water
water
standard
standard
condenser
condenser
Figure 58
trgtrc010_book.book Page 42 Wednesday, September 1, 1999 10:42 AM