EPA 608 Core · Refrigeration Fundamentals · Medium
How is subcooling measured?
Answer: B. Condensing saturation minus liquid line temperature.
- ASuction line minus evaporator saturation temperature.
- BCondensing saturation minus liquid line temperature.✓ Correct
- CDischarge minus outdoor air temperature.
- DReturn air minus supply air temperature.
Why B is right
Subcooling is how far the liquid has cooled below its condensing (saturation) temperature: saturated condensing temperature minus liquid line temperature. Superheat is the vapor-side counterpart, measured at the suction line.
More Core questions
- What does superheat measure?
- When does a PT chart give the actual temperature of a refrigerant from its pressure?
- What does refrigerant do inside the evaporator?
- Which component raises the pressure and temperature of refrigerant vapor?
- What characterizes a zeotropic refrigerant blend (400-series)?
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A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.