3
Form No. 5500-32 Rev C
Code: +0700092EN REV 3.2 04APR2022
ENG
Installations that require constant operation at full capacity
will reduce cylinder life.
The water level in the cylinder is, on
average, much higher and the electrodes become completely
insulated more quickly. The importance of providing adequate
humidifier capacity should not be underestimated.
Maximum Production
Another factor affecting cylinder life is the maximum
production setting. A higher production rate will result in a
shorter cylinder life (See Fig. 1.c.).
Structures Under Construction
In high-end construction projects, humidification is often
required while the structure is being finished. Humidification
is necessary to protect and stabilize wood floors, trim and
decoration. Humidification load, however, in an unfinished
structure may be five to eight times higher than when finished.
5500 Steam humidifiers may be operated while construction
is underway, but reduced cylinder life is to be expected.
Good
practice dictates that the steam cylinder also be replaced
once the project is completed.
20%
100%
Output
Cylinder
life
Fig. 1.c
1.3 CALCULATING HUMIDITY LOAD
Steps to Estimate Humidity Load
Humidity Load Calculation (GPD)
Total Square Footage
x Average Ceiling Height
x Factor from Table 1.b.
x 1.05 for each Fireplace
x 2.88
_________________________
Gallons per Day
Pounds of Moisture / Hour / Cubic Foot*
Temp
0
F/
0
C
35%
40%
45%
50%
68°F/20°C
0.00015
0.00018
0.00021
0.00024
70°F/21°C
0.00017
0.00020
0.00023
0.00026
72°F/22°C
0.00019
0.00022
0.00025
0.00028
* Based on .5 air charges per hour
Tab. 1.b
Example:
• 2,500 SF house with 1,000 SF basement (3,500 SF total
square footage)
• 9 ft. ceilings
• 70°F and 40% RH
• 2 fireplaces
Humidity Load = 3,500 x 9 x .00020 x 1.05 x 1.05 X 2.88 = 20
gpd
For more accurate results based on U.S. geographic region, see
the GeneralAire® online humidity calculator at https://www.
generalfilters.com/support/humidity-calculator.html.
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