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? See Illustration GS-RA-22

Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration.

Question

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? See Illustration GS-RA-22

Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option D: 70 degrees F. Using a psychrometric chart, air at 80 degrees F and 70 percent relative humidity intersects the saturation curve at 70 degrees F. This intersection point represents the dew point temperature, which is the temperature at which the air becomes fully saturated and moisture begins to condense out of the air.