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Pressure Drop and Electrical Cost
Considerations in Filter Performance
Running a filter to the final manufacturer’s recommended
pressure reading could mean you are squeezing every
last penny of cost from the filter. It could also mean you
just wasted more money in energy costs because of the extra
time it takes to heat or cool your facility due to lower
supply velocities. So how do you know when it is the optimal
time to change your filters?
The following equation
will apply:
Energy
Cost = HP x ($/KwHr) x Hours/0.746
Where HP (motor horsepower) = Average
DP
x CFM/Fan Efficiency x 0.001173
This is graphically
represented by:
 Figure
13.3 Optimum Final Pressure Drop
NAFA
Guide to Air Filtration, 3rd Edition 2001, National Air
Filtration Association, page 13.2 - 13.6
By utilizing this
formula, you can determine where the optimal change out time
is for your particular filtration system based on your
specific electric rates, hours of operation and type of
filter.
References:
1
NAFA Guide to Air Filtration,
3rd
Edition 2001, National Air Filtration Association, page 13.2-
13.6
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