If outside air at 80 degrees F and 70...

Question 1 of 292185eccef9dbacbc34ba4d45eab

If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil? Illustration RA-0022

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🔍 Key Concepts

• Dew point is determined by the air’s moisture content, not by following a wet-bulb diagonal. • On a psychrometric chart, a horizontal line represents constant moisture content and leads to the dew-point/saturation boundary. • Relative humidity combines with dry-bulb temperature to identify one air-condition state point.

💭 Think About

• Begin at the stated dry-bulb temperature, then find the specified relative-humidity curve. • From their intersection, trace the horizontal constant-moisture line toward the sloped saturation boundary. • Read the temperature where that horizontal line meets saturation, and compare it with the listed values.

✅ Before You Answer

• Make sure you use the 70% RH curve rather than a wet-bulb diagonal. • Do not read dew point directly from the original dry-bulb temperature. • The correct chart value should be close to the saturation temperature associated with the same vapor pressure.