Problem 7.2: On a winter day, the outside air has a temperature of -15°C and a relative humidity of 70%. a) If outside air is brought inside and heated to room temperature of 20°C without adding moisture, what is the new relative hu- midity? Answer: 6% b) If the room volume is 60 m³, what mass of water must be added to the air by a humidifier to raise the relative humid- ity to 40%? Answer: 0.36 kg c) How much heating energy is needed in order accomplish (a) and (b), and what fraction of the total heating energy is repre- sented by (b)? Answer: 9.0 x 106 J, 26%
Problem 7.2: On a winter day, the outside air has a temperature of -15°C and a relative humidity of 70%. a) If outside air is brought inside and heated to room temperature of 20°C without adding moisture, what is the new relative hu- midity? Answer: 6% b) If the room volume is 60 m³, what mass of water must be added to the air by a humidifier to raise the relative humid- ity to 40%? Answer: 0.36 kg c) How much heating energy is needed in order accomplish (a) and (b), and what fraction of the total heating energy is repre- sented by (b)? Answer: 9.0 x 106 J, 26%
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Transcribed Image Text:Problem 7.2: On a winter day, the outside air has a temperature of
-15°C and a relative humidity of 70%.
a) If outside air is brought inside and heated to room temperature
of 20°C without adding moisture, what is the new relative hu-
midity? Answer: 6%
b) If the room volume is 60 m³, what mass of water must be
added to the air by a humidifier to raise the relative humid-
ity to 40%? Answer: 0.36 kg
c) How much heating energy is needed in order accomplish (a)
and (b), and what fraction of the total heating energy is repre-
sented by (b)? Answer: 9.0 x 106 J, 26%
