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46 TRG-TRC012-EN
1 Male and female screw rotors
2 Bearing lubrication and cooling, and rotor oil injection
3 Outside of the tubes
4 Electronic expansion valve and orifice plate
5) a) compression
b) condensation (desuperheat, condense, subcool)
c) expansion
d) evaporation
6 Point 1, the suction inlet of the compressor
7 Fully closed
8 At part load, the opening created by the slide valve movement allows
refrigerant vapor to bypass from the rotor pockets back to the suction side
of the compressor. This reduces the volume of vapor available for the
compression process. It also reduces the amount of rotor length available
for compression.
9 ASHRAE Guideline 3
10 Helps reduce maintenance costs, detects problems without compressor
disassembly, oil charges last longer, less environmental problems with
disposing of used oil, helps maintain the compressor’s efficiency and
reliability, and helps lower refrigerant emissions.
11 Cycling or varying the speed of the cooling tower fans, using a cooling
tower bypass pipe, modulating a throttling valve, using a chiller bypass
pipe, or employing a variable-speed drive on the condenser water pump.
12 The water flow rate through the chiller’s evaporator must stay between the
minimum and maximum evaporator bundle flow rates as specified by the
chiller manufacturer. The rate which the evaporator water flow rate changes
must be kept below a specified level.
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