Question 45Refrigeration/AC - Assistant Engineer70% to pass
Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?
AI Explanation
The correct answer is D) all of the above.
Capacity control of a centrifugal refrigeration compressor can be accomplished by varying the position of the hot gas bypass valve, varying the speed of the compressor, or varying the position of the suction inlet damper vanes. These methods allow the compressor to adjust its output to match the cooling demand, improving efficiency and preventing issues like liquid slugging or surging.
The other options are incorrect because they only describe one of the possible means of capacity control, while the correct answer recognizes that all three methods can be used to regulate the compressor's output.
Related Questions
#43 A refrigeration compressor used in a multi-box refrigeration system is designed with six of its eight cylinders able to be controlled for variable load conditions. If all of the reefer boxes are currently feeding, what percentage of the total number of compressor cylinders will be loaded after start up? #44 During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value? #46 Why is a purge recovery unit typically fitted on low-pressure centrifugal chillers? #47 Minor repairs may be performed on low-pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished? #48 The most cost-effective method of recovering refrigerant from a low-pressure chiller with more than 500 lbs. of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol?