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TRG-TRC010-EN 15
notes
A pressure–enthalpy (
p
-
h
) chart illustrates the refrigeration cycle of the
centrifugal water chiller.
First, let’s review the components of a 2-stage centrifugal chiller in the context
of the refrigeration cycle.
Refrigerant vapor leaves the evaporator and flows to the compressor, where it
is compressed to a higher pressure and temperature. High-pressure refrigerant
vapor then travels to the condenser where it rejects heat to water, and then
leaves as a saturated liquid. The pressure drop created by the first expansion
device causes part of the liquid refrigerant to evaporate and the resulting
mixture of liquid and vapor enters the economizer. Here, the vapor is separated
from the mixture and routed directly to the inlet of the second-stage impeller.
The remaining saturated liquid refrigerant enters the second expansion device.
Centrifugal Water Chillers
period two
Figure 22
2-stage centrifugal chiller
Refrigeration Cycle
condenser
condenser
evaporator
evaporator
expansion devices
expansion devices
economizer
economizer
2-stage
2-stage
compressor
compressor
Figure 23
period two
Refrigeration Cycle
trgtrc010_book.book Page 15 Wednesday, September 1, 1999 10:39 AM