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TRG-TRC010-EN 49
period six
Review
notes
Period 2 described the refrigeration cycle of 2-stage centrifugal water chillers
with a pressure-enthalpy chart. The operation of the purge system for low-
pressure chillers was also presented.
Period 3 further explained the operation of the centrifugal compressor. It
described the use of impeller inlet vanes as one method for controlling
centrifugal compressor capacity. Surge, multistage compressors, and
adjustable-frequency drives were also discussed.
Review—Period 2
1
1
2
2
3
3
4
4
6
6
7
7
pressure
pressure
enthalpy
enthalpy
evaporator
evaporator
condenser
condenser
2-stage
2-stage
compressor
compressor
expansion
expansion
devices
devices
8
8
9
9
P
P
e
e
P
P
c
c
P
P
1
1
5
5
economizer
economizer
Figure 66
Review—Period 3
inlet vanes
inlet vanes
impellers
impellers
Figure 67
trgtrc010_book.book Page 49 Wednesday, September 1, 1999 10:42 AM