Dust-control electric savings calculator

Equivalent full-power avoided hours are a case-specific simplification.

Units

S_{e} = \frac{\text{hp} \times 0.746}{\eta_{m}} \times {\Delta h_{\text{day}}} \times \text{days} \times c_{e}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

S_{e} = \frac{55 \times 0.746}{0.89} \times 3.2 \times 235 \times 0.13 \approx 4{,}507

Symbol	Meaning	Unit
$S_{e}$	annual electric savings	$/yr
$\text{hp}$	motor shaft horsepower	hp
$\eta_{m}$	motor efficiency	fraction
${\Delta h_{\text{day}}}$	equivalent daily motor hours avoided	h/day
$\text{days}$	annual production days	day/yr
$c_{e}$	energy price	$/kWh

Symbol	Meaning	Unit
$S_{e}$	annual electric savings	$/yr
$P_{\text{shaft}}$	shaft power expressed as kilowatts	kW
$\eta_{m}$	motor efficiency	fraction
${\Delta h_{\text{day}}}$	equivalent daily motor hours avoided	h/day
$\text{days}$	annual production days	day/yr
$c_{e}$	energy price	$/kWh

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.