The outside air is a a temperature of -25°C, and is saturated. This air is drawn into the building and heated to 21°C. What is the relative humidity of the air after passing through the heating coil? (Air at -25°C holds a maximum of 0.0005 kg of moisture/kg of water, and air at 21°C holds a maximum of 0.015 kg of moisture/kg of water).
a. 3.3%
b. 0.015%
c. 0.5%
d. 10.6%
e. 4.5%
Answer: A