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Motor Starter (Purchased Separately)
The starter allows for the proper starting and disconnecting of the electrical energy for the
compressor-motor, oil pump, oil heater, and control panels.
Utility Vessel
During normal operation, this vessel functions as an economizer, returning flash gas to the
second stage of the compressor and increasing the efficiency of the refrigeration cycle. During
periods of shutdown and service, the utility vessel can serve as a storage tank for the
refrigerant.
Refrigeration Cycle (
Figure 4
)
The machine compressor continuously draws large quantities of refrigerant vapor from the
cooler, at a rate determined by the amount of guide vane opening. This compressor suction
reduces the pressure within the cooler, allowing the liquid refrigerant to boil vigorously at a fairly
low temperature (typically 38 to 42 F [3 to 6 C]).
The liquid refrigerant obtains the energy needed to vaporize by removing heat from the water
or brine in the cooler tubes. The cold water or brine can then be used in air conditioning and/or
other processes.
After removing heat from the water or brine, the refrigerant vapor enters the first stage of the
compressor, is compressed and flows into the compressor second stage. Here it is mixed with
flash-economizer gas and is further compressed.