Air Filters for Business to Business Education
Energy
Savings: If a filter has a low pressure drop, then the motor driving
the fan does not have to run as much to do its job. The intake system will require
less energy to run and result in a lower cost.
Operational Savings: If a filter can hold more dust and particulate matter
while still keeping a low pressure drop, then the filter will not have to be
changed as often. The fewer change-outs that are needed will more than likely
result in lower operating costs.
Energy Formula
(Used to determine energy costs over the life of air filters)
| 1. Horsepower = | CFM X Static Pressure X 5.2 33,000 X .60 (Blower Efficiency) |
| 2. Kilowatt Hours = | Horsepower X .746 X 8000 (Operating Hours) |
| 3. Operating Cost = | Kilowatt Hours X Cost of Energy per Kwh |
Example of Life-cycle Costing: Two bag filters, one with an initial pressure drop of .40" w.g., the other with an initial pressure drop of .50" w.g. The air-handling system is rated at 10,000 CFM, and is run 12 hours a day, 365 days a year. Cost of energy is .10/$Kwh.
| Example A: .40" w.g. | Example B: .50" w.g. |
| 10,000 CFM X .40 X 5.2 = 1.050 HP 33,000 X .60 |
10,000 CFM X .50 X 5.2 = 1.313 HP 33,000 X .60 |
| 1.050 HP X .746 X 8000 = 6269 Kwh | 1.313 HP X .746 X 8000 = 7835 Kwh |
| 6269 Kwh X .10 = $626.94 | 7835 Kwh X .10 = $783.59 |
One year life-cycle cost savings is $156.65
5.2 Multiplier converts
Static Pressure to pounds per square foot
33,000 is equal to one horsepower
in foot pounds
.746 Multiplier converts kilowatts
to horsepower
CFM is the abbreviation for
cubic feet per minute of air
Blower efficiency is usually
considered to be 60%
8000 Operating Hours is equal
to 12 hours a day operation, 365 days a year
w.g. means water gauge (either
oil or water may be used as a manometer)
(This Energy Formula is Courtesy of R.P. Fedder Corporation)
Phone
(919) 233-1210 Fax (919) 233-1282