A building has indoor air conditions of 70F dry bulb temperature and 40% relative humidity. Determine the

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A building has indoor air conditions of 70°F dry bulb temperature and 40% relative humidity. Determine the direction of water vapor flow under the following outdoor air conditions that represent a dry, heating climate:
a. 32°F dry bulb temperature and 40% relative humidity (winter conditions)
b. 90°F dry bulb temperature and 20% relative humidity (summer conditions)

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