For the conditions in the previous exercise, describe a good strategy for use of a VDR.

Data from previous Exercise 

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