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54 TRG-TRC010-EN
1) kinetic energy to static energy
2) impeller
3) By flashing a portion of the refrigerant prior to entering the evaporator, the
economizer reduces the compressor power required since the refrigerant
vapor generated in the economizer only needs to be compressed by the
higher-stage impeller.
4) A hermetic motor is totally enclosed within the chiller’s refrigeration system
and the heat it generates is absorbed by liquid refrigerant. An open motor is
mounted externally—outside of the chiller’s refrigeration system—and uses
a coupling to connect the motor and compressor shafts. The heat generated
by the open motor is rejected to the air drawn in from the equipment room.
5) a) first stage of compression or first-stage impeller
b) economizer
c) evaporator
6) low-pressure chiller; purge system
7) radial velocity (V
r
)
8) tangential velocity (V
t
)
9) inlet vanes and adjustable-frequency (or variable-speed) drive
10)The heat transfer (tube) surfaces inside the chiller must be kept free of scale
and sludge to ensure optimum performance. Even a thin deposit of scale
can substantially reduce heat transfer capacity.
11)higher; lower
12)It is used to more closely predict actual chiller performance by accounting
for the effect of impurities in the chilled- and condenser-water systems.
These impurities will eventually deposit on evaporator and condenser tube
surfaces, impeding (fouling) heat transfer.
Answers
trgtrc010_book.book Page 54 Wednesday, September 1, 1999 10:42 AM