Dehumidification Formula
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1Dehumidification Formula
The following formula is for starting conditions only and should be modified as psychrometric conditions dictate.
STEP 1
Determine the cubic footage
(ft³) of the environment to be
dried.
L X W X H =
L x W x H (10 x 14 x 8 = 1120 ft³)
STEP 2
1
2
3
4
CLASS
Determine which class (rates)
Slow
Fast
Fastest
Bound
of evaporation
Water
Class:
1. No carpet & pad
2. With carpet & pad
3. Water from above; wet walls
Conventional
100
40
30
N/A
>24” high
Refrigerant
4. Specialty/Bound water
LGR
100
50
40
50
STEP 3
Refrigerant
Choose the dehumidifier(s)
to be used
Desiccant
If both conventional and LGR
1
2
3
2
refrigerants are to be installed, use
the calculation for conventional
refrigerants
Conventional and LGR:
Step 1: (cft) ÷ Step 2: (class factor) = _______ AHAM Pints needed minimum
STEP 4
Step 3: AHAM Pints needed ÷ Dehu AHAM Rating = # of Dehus needed
Do the Math
Desiccant:
Step 1: (cft) ÷ Step 2: (class factor) = ( Total) ÷ 60 = _____________ CFM
needed
Step 3: CFM needed ÷ Dehu CFM Rating = # of Dehus needed
Conventional:
1120 cft ÷ 30 = 37 AHAM Pints needed minimum to start the job
Example
Desiccant:
Illustration is Class 3
1120 cft X 3 =3360 ÷ 60 = 56 CFM needed minimum to start the job
Dehumidifiers Water Removal Ratings
Dehumidifier
AHAM Rating (80˚/60%RH/24
CFM
hours)
DrizAir 1200
64 PT/Day (30 L)
227
LGR Evolution
70 PT/Day (33 L)
160
LGR 2000
110 PT/Day (52 L)
360
Desiccant 150
110
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