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IE1→IE3 Efficiency Upgrade Savings

Contents

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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

SymbolMeaningUnitSource
$P_\text{rated}$Motor rated shaft powerkWnameplate
$LF$Average load factor-measurement
$\eta_\text{old, new}$Old / new efficiencies-nameplate
$h$Operating hoursh/yroperating profile

Sources

  • IEC 60034-30-1 - IE efficiency classes.