A refrigeration compressor used in a...

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Question 1 of 205eccef9dbacbc34ba4d4604f

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?

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🔍 Key Concepts

• Capacity control on multi-cylinder refrigeration compressors (unloading cylinders to match load) • Meaning of "all of the reefer boxes are currently feeding" in terms of system load • Relationship between total cylinders, controllable (unloadable) cylinders, and loaded cylinders at start-up

💭 Think About

• First, determine how many cylinders the compressor has in total, and how many of those can be controlled for variable load conditions. • If ALL reefer boxes are feeding, is the system at minimum load, partial load, or full load? What does that imply about how many controllable cylinders will actually be loaded? • Convert the number of loaded cylinders into a percentage of the total: loaded cylinders divided by total cylinders, times 100.

✅ Before You Answer

• Confirm the total number of cylinders on the compressor before doing any percentage calculation. • Decide whether controllable cylinders means they can be either loaded or unloaded depending on demand—not that they are always unloaded. • Make sure the percentage you choose reflects a situation where all evaporators (reefer boxes) are on line, which corresponds to the highest system load condition.

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