Commercial Refrigeration Ch. 4 Questions and Answers (Graded A)
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Module
Commercial Refrigeration Ch. 4
Institution
Commercial Refrigeration Ch. 4
Commercial Refrigeration Ch. 4 Questions and Answers (Graded A)Commercial Refrigeration Ch. 4 Questions and Answers (Graded A)Commercial Refrigeration Ch. 4 Questions and Answers (Graded A)Commercial Refrigeration Ch. 4 Questions and Answers (Graded A)
The discharged vapor picks up which of the fo...
Commercial Refrigeration Ch. 4
Questions and Answers (Graded
A)
The discharged vapor picks up which of the following two more additional sources of
sensible heat as the suction vapor is processed through the compressor? - ANSWER
- Motor heat and the heat of compression
What is "clearance volume" and how can it affect compressor efficiency? - ANSWER
- The area of high pressure gas between the top of the piston and the bottom of the
valve plate.
What is "volumetric efficiency"? - ANSWER - How well a compressor is operating
compared with its design capacity
If an R404A commercial freezer has design conditions of -20° evaporator and +125°
condensing, what is the compression ratio? - ANSWER - 10.5 to 1
In the example above what is the compression ratio if the customer lowers the box
temperature so that the evaporator is operating at -30° with the same head
pressure? - ANSWER - 14.1 to 1
Assume the above freezer evaporator temperature remains at -20°, but the
condenser is designed for a 25° condenser split and the condensing temperature
drops to 120°. What is the compression ratio? - ANSWER - 10.5 to 1
Which situation will damage the above freezer compressor quicker, lowering the
suction pressure by 5 psig or raising the head pressure by 20 psig, and why? -
ANSWER - Lowering the suction pressure because it raises the compression ratio
more than raising the head pressure
In the above question what kind of damage will occur to the compressor? - ANSWER
- Overheating
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