EPA 608 Core · Refrigeration Fundamentals · Medium
What does superheat measure?
Answer: D. Heat added to vapor above its boiling temperature.
- AHeat removed from liquid below its condensing temperature.
- BThe temperature drop across the metering device.
- CThe difference between indoor and outdoor air.
- DHeat added to vapor above its boiling temperature.✓ Correct
Why D is right
Superheat is how far the vapor's temperature is above its saturation (boiling) temperature at the same pressure, usually measured at the evaporator outlet or suction line. It confirms that only vapor returns to the compressor.
More Core questions
- 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)?
- Which PT chart value do you use to calculate subcooling for a zeotropic blend?
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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.