Refrigeration & Air Conditioning USCG Question #355 (Set 7)

What is the wet bulb temperature of air if the dry bulb temperature of the air is 90 degrees and the relative humidity is 65%? Illustration GS-RA-22 Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration.

Official USCG Answer & Rule Citation

Correct Answer: Option D — 80 degrees F

Psychrometric chart analysis at 90 degrees Fahrenheit dry bulb and 65 percent relative humidity intersects at a wet bulb temperature of 80 degrees Fahrenheit. Proper reading of psychrometric properties is essential for marine HVAC load calculations.

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