Capacity control
The major components of a chiller are selected for full load capacities, therefore capacity must be
controlled to maintain a constant chilled liquid temperature leaving the evaporator. Pre-rotation
vanes (PRV), located at the entrance to the compressor impeller, compensate for variation in load.
See Figure 1.
The position of these vanes is automatically controlled through a lever arm attached to an electric
motor located outside the compressor housing. The automatic adjustment of the vane position in
effect provides the performance of many different compressors to match various load conditions
from full load with vanes wide open to minimum load with vanes completely closed.
Figure 2: Refrigerant flow-through chiller (falling film evaporator)
Model YK (Style H), R-134a and R-513A10
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