Dust-control demand savings calculator

The reference estimates reduction from concurrent machines, not from average daily running time.

Units

S_{d} = \frac{\text{hp} \times 0.746}{\eta_{m}} \times r_{\text{peak}} \times c_{\text{d,month}} \times 12

Calculator

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

Given

S_{d} = \frac{55 \times 0.746}{0.89} \times 0.3 \times 12 \times 12 \approx 1{,}992

Symbol	Meaning	Unit
$S_{d}$	annual demand savings	$/yr
$\text{hp}$	motor horsepower at the case full load	hp
$\eta_{m}$	motor efficiency	fraction
$r_{\text{peak}}$	fraction of demand reduced during billing interval	fraction
$c_{\text{d,month}}$	monthly demand price	$/kW·month

Symbol	Meaning	Unit
$S_{d}$	annual demand savings	$/yr
$P_{\text{shaft}}$	shaft power expressed as kilowatts	kW
$\eta_{m}$	motor efficiency	fraction
$r_{\text{peak}}$	fraction of demand reduced during billing interval	fraction
$c_{\text{d,month}}$	monthly demand price	$/kW·month

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