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52 TRG-TRC010-EN
Questions for Period 1
1) A centrifugal compressor converts ___________ energy to ____________
energy.
2) Does the refrigerant velocity increase in the impeller, diffuser passages, or
volute of the compressor?
3) What is the benefit of using an economizer cycle with a multistage
centrifugal compressor?
4) What is the difference between a hermetic and an open motor?
Questions for Period 2
5) Using the pressure-enthalpy diagram in Figure 71, identify the following
process of the 2-stage centrifugal chiller’s refrigeration cycle:
a) ➀ to ➁
b) ➆ to ➂
c) ➈ to ➀
6) Air, moisture, and other noncondensable gases are removed from a
_____-pressure chiller by what component?
Questions for Period 3
7) What velocity component is directly proportional to the refrigerant flow rate
through the compressor?
1
1
2
2
3
3
4
4
6
6
7
7
pressure
pressure
enthalpy
enthalpy
8
8
9
9
5
5
Figure 71
Quiz
trgtrc010_book.book Page 52 Wednesday, September 1, 1999 10:42 AM