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Level 2 > Review Questions > Flashcards

Review Questions Flashcards

1
Q

what happens to super heat and subcooling when a unit is over charged?

A
  1. Less super heat, more subcooling
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2
Q

what happens to super heat and subcooling when a unit is under charged?

A
  1. More super heat less subcooling
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3
Q

using R290 with a SST of 22 and a SCT of 110, what is the compression ratio.

A
  1. Absolute discharge pressure / Absolute suction pression(22F)
    43.16pasig + 14.7 = 57.86psia / (110F ) 199.6 +14.7 = 214.3 214.3 / 57.86 = 3.703:1 compression ratio.
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4
Q

. what side of does air enter into the evaporator

A

Refrigerant leaving, super heated side *

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Level 2 (7 decks)

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