Low dew point temperature (-25°F) room design

The objective of the project was to design an HVAC system for a lithium battery manufacturing facility in Minnesota, USA. The system was to be designed for a 7544 sq. ft. space with a 9 ft high ceiling, to be maintained at 25 F dew point temperature (1.3% relative humidity @ 70 F dry bulb temperature). The facility had to be designed and constructed inside an existing warehouse style, 14 ft high roof building, absolutely vapor tight, such that no moisture can migrate to the indoors from any interior walls, floor or roof.