Annual energy and USD savings from replacing an IE1 standard motor with an IE3 premium-efficiency motor.
Formula
$$ \Delta E = P_\text{rated} \cdot LF \cdot \left(\frac{1}{\eta_\text{old}} - \frac{1}{\eta_\text{new}}\right) \cdot h $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P_\text{rated}$ | Motor rated shaft power | kW | nameplate |
| $LF$ | Average load factor | - | measurement |
| $\eta_\text{old, new}$ | Old / new efficiencies | - | nameplate |
| $h$ | Operating hours | h/yr | operating profile |
Sources
- IEC 60034-30-1 - IE efficiency classes.