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period two
Compressor Capacity Control
notes
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VXFWLRQWHPSHUDWXUH | Figure 32 |
At design conditions, the capacities of the evaporator coil and compressor balance (A) at a suction temperature of 45°F [7.2°C] and a capacity of 31 tons [109 kW]. As the cooling load decreases below this balance point, assuming a constant condensing pressure, the compressor pumping capacity decreases with the falling suction temperature along the
When the first set of two cylinders is unloaded, the compressor operates with only four active cylinders and the compressor capacity falls immediately to
19 tons [66.8 kW] along the
As the load continues to decrease, the suction temperature reaches the minimum set point, 28°F
This illustrates how cylinder unloading extends the stable
22 |
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