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16 TRG-TRC004-EN
notes
period one
Compressor Types
In the air-conditioning industry, centrifugal compressors are most commonly
used in prefabricated water chillers ranging from 100 to 3,000 tons [350 to
10,500 kW]. They are also used in field-assembled water chillers up to
8,500 tons [30,000 kW].
In addition to the different methods of compression, compressors can be
classified as open, hermetic, and semihermetic. A reciprocating compressor
will be used to explain these terms.
An open compressor is driven by an external power source, such as an
electric motor, an engine, or a turbine. The motor is coupled to the compressor
crankshaft by a flexible coupling. Since the shaft protrudes through the
compressor housing, a seal is used to prevent refrigerant from leaking out of
the compressor housing.
This motor is cooled by air that is drawn in from the surrounding space. The
heat removed from the motor must still be rejected from the space, either by
mechanical ventilation or, if the space is conditioned, by the building’s cooling
system.
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Figure 24