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44 TRG-TRC004-EN
1 To elevate the pressure, and, therefore, the temperature, of the refrigerant
vapor high enough that it can reject heat to air, or some other fluid, at
normally available temperatures.
2 Reciprocating, scroll, helical-rotary (or screw), and centrifugal
3 During the intake stroke, the piston travels away from the discharge valve
and creates a vacuum effect, reducing the pressure within the cylinder to
below suction pressure. Since the pressure within the cylinder is less than
the pressure of the refrigerant at the suction side of the compressor, the
suction valve is forced open and the refrigerant vapor is drawn into the
cylinder.
4 True
5 Hermetic or semihermetic
6 Decreases
7 Cycling individual scroll compressors on and off
8 Inlet vanes or variable-speed drive with inlet vanes
9 Supply air temperature
10 Chilled-water supply temperature
11 Space temperature
12 Sensing the suction temperature and hot gas bypass
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