Referring to the illustrated psychrometric...

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Question 1 of 2066636eee28f7522a1c51f126

Referring to the illustrated psychrometric chart, suppose air at a dry bulb temperature of 60°F and a relative humidity of 52% passes over a heating coil, resulting in sensible heat gain, and the off-coil temperature is now 80°F. What is off-coil relative humidity? Illustration RA-0022

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Question 1 of 20

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🔍 Key Concepts

• Locate the initial state on the psychrometric chart at 60°F dry bulb and 52% relative humidity. • For sensible heat gain only, the moisture content (grains of moisture per pound of dry air) remains constant, so you move horizontally on the chart. • At the new dry bulb temperature of 80°F, follow the constant-moisture line to find the new percent relative humidity.

💭 Think About

• How do you find the point that represents 60°F and 52% RH on the chart, and which constant property line passes through it? • When air is only heated (no moisture added or removed), which chart lines do you stay on as temperature changes? • Once you reach the 80°F point along that line, which curved line above corresponds to the new RH value?

✅ Before You Answer

• Confirm that you are following a constant grains of moisture (horizontal) line from the initial point to 80°F. • Verify that you read the relative humidity from the correct family of curved lines at the top of the chart. • Double-check that your final RH value is lower than the original 52%, since heating air without adding moisture decreases relative humidity.

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