Dehumidification capacity = 4,167 SCFM x 3
ACH = 12,501 SCFM
This capacity could be provided using three
5,000-CFM
dehumidifiers or one 15,000-CFM
dehumidifier. Use this same formula to calculate the capacity
needed for other dehumidification applications in buildings
by changing the ACH value.
INDUSTRIAL
CONDENSATION PREVENTION
Use desiccant
dehumidifiers in combination with air
conditioning units. Size dehumidifier flow for approximately
one-half the air conditioner flow. Use 400 SCFM per ton of A/C
capacity. If large amounts of outside air (above 10% of total
flow) are required, use an air conditioner to pre-cool the dehumidifier
inlet.
Example: Provide temporary dehumidification for a commercial
building with a rooftop 20-ton air conditioner.
Dehumidification capacity = 400 SCFM x 20 tons ÷2 = 4,000 SCFM
INDUSTRIAL
PREPARATION AND SURFACE COATINGS
Temporary dehumidification inside tanks being prepared for painting
or industrial coating eliminates the potential for condensation.
Two sizing methods are shown.
Procedure: Purge the tank with 100% dehumidified air.
Return air is not used due to the heavy dirt loading. Usually
2 to 4 ACH is sufficient.
Example: Provide temporary dehumidification for a 100'
diameter tank 30' high. The tank has (3) 3' diameter manholes
and (8) 1' diameter vents. Two sizing methods are given below
to calculate the dehumidification capacity required:
Sizing Method #1 (Volume)
