Capacity control of a centrifugal...

Question 1 / 270705eccef9dbacbc34ba4d46043

Question 1 of 270705eccef9dbacbc34ba4d46043

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

Question 1 of 27070

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

🔍 Key Concepts

• Centrifugal compressor capacity control methods in HVAC/refrigeration systems • Difference between bypassing gas, throttling/controlling inlet flow, and changing compressor speed • How each method affects mass flow rate and pressure ratio

💭 Think About

• For each option, ask yourself: does this method actually change how much refrigerant the compressor effectively handles, or does it just redirect it? • Think about which method(s) are commonly used in large centrifugal chillers to match cooling load while maintaining stable compressor operation. • Consider how changing inlet guide vanes versus changing speed impacts compressor efficiency and surge margin.

✅ Before You Answer

• Verify which methods are recognized as practical, standard capacity control techniques for centrifugal refrigeration compressors. • Check whether hot gas bypass alone is typically described as a "capacity control" method for centrifugal machines or more for other compressor types. • Confirm whether more than one of the listed methods can legitimately control capacity, and whether the exam is likely focusing on a single standard method or all applicable ones.

Question 1 of 27070

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

varying the position of the hot gas bypass valve

varying the position of the suction inlet damper vanes

varying the speed of the compressor

all of the above

Question 1 / 270705eccef9dbacbc34ba4d46043

Question 1 of 270705eccef9dbacbc34ba4d46043

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?

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Question 1 of 27070

Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?