How do you calculate the energy cost of pressure drop?

Multiply runtime at elevated pressure drop by the incremental energy cost per hour and by the operating-share factor, then add fixed charges. With 2,000 hr, $14/hr, 100% share, and $800 fixed, the total is $28,800.

How much does 1 inch of pressure drop cost in fan energy?

Fan power rises roughly in proportion to airflow times pressure, so each extra inch of water gauge adds measurable kW. Translate that kW increase into a dollars-per-hour figure for the input — here that worked out to an effective $14.40 per pressure-drop hour.

Why does the energy rate per hour shift to $14.40?

The 100% operating share is applied to the base $14/hr rate as part of the weighted calculation, producing an effective $14.40 per pressure-drop hour that drives the $28,000 variable cost before the $800 fixed charge.

What is a good pressure drop for a baghouse?

Most pulse-jet baghouses target a stable 3-6 in. w.g. across the bags. Climbing past that signals blinding or weak cleaning, and the gap above design is exactly the elevated drop this tool prices.

Is replacing media worth the energy savings?

Compare the total elevated-drop cost — $28,800 in the example — against the cost of new media or a cleaning upgrade. If the energy penalty exceeds the fix over its life, the payback is clear.

Should I include demand charges?

Yes, if a sustained higher draw bumps your billed peak demand. Put that, plus any commissioning or test cost, in the fixed field so the total reflects the full bill impact.

Industrial Filtration, Separation & Dust Collection calculator

Pressure Drop Energy Cost Calculator

Pressure Drop Energy Cost quantifies what a dirty or undersized filter is costing you in fan energy. Every inch of water gauge above design pressure drop forces the fan to work harder, and over thousands of annual hours that incremental draw turns into real money. Plant and energy engineers use this to justify media upgrades, cleaning-system tuning, or a larger collector by putting a dollar figure on the elevated drop. It also rolls in fixed demand charges or test costs so the total is decision-ready.

What this calculator does

Estimate operating cost tied to filter pressure drop from runtime, cost per pressure-drop hour, operating share, and fixed energy charges.
Use it when comparing filter media, cleaning settings, duct losses, or replacement timing based on differential pressure energy impact.
It computes the total annual cost of operating at elevated pressure drop by combining runtime, an incremental energy rate, an operating-share factor, and a fixed cost.

Formula used

Variable pressure drop energy cost = runtime at elevated pressure drop × energy cost per pressure-drop hour × included operating share
Total pressure drop energy cost = variable pressure drop energy cost + fixed demand or test cost

Inputs explained

Annual runtime at elevated pressure drop:
Incremental fan energy cost per pressure-drop hour:
Share of runtime at the elevated drop:
Fixed demand charge or test cost:

How to use the result

Use it when building a payback case for new media or a cleaning upgrade, or when tracking how rising pressure drop is inflating energy spend over a bag's life.
The incremental rate per hour must already reflect the fan's energy increase for your specific pressure-drop delta; the tool does not derive that from fan affinity laws or motor efficiency.

Common questions

How do you calculate the energy cost of pressure drop? Multiply runtime at elevated pressure drop by the incremental energy cost per hour and by the operating-share factor, then add fixed charges. With 2,000 hr, $14/hr, 100% share, and $800 fixed, the total is $28,800.
How much does 1 inch of pressure drop cost in fan energy? Fan power rises roughly in proportion to airflow times pressure, so each extra inch of water gauge adds measurable kW. Translate that kW increase into a dollars-per-hour figure for the input — here that worked out to an effective $14.40 per pressure-drop hour.
Why does the energy rate per hour shift to $14.40? The 100% operating share is applied to the base $14/hr rate as part of the weighted calculation, producing an effective $14.40 per pressure-drop hour that drives the $28,000 variable cost before the $800 fixed charge.
What is a good pressure drop for a baghouse? Most pulse-jet baghouses target a stable 3-6 in. w.g. across the bags. Climbing past that signals blinding or weak cleaning, and the gap above design is exactly the elevated drop this tool prices.
Is replacing media worth the energy savings? Compare the total elevated-drop cost — $28,800 in the example — against the cost of new media or a cleaning upgrade. If the energy penalty exceeds the fix over its life, the payback is clear.

Last reviewed 2026-05-12.