ClueLuma

3-phase equipment heat calculator

Uses line quantities for three-phase electrical input and its space heat.

Units
q3ph=3×VLL×I×PF×3.412×Usefactorq_{\text{3ph}} = \sqrt{3} \times V_{\text{LL}} \times I \times \mathrm{PF} \times 3.412 \times \text{Use}_{\text{factor}}

Calculator

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

—
V
—
A
Btu/h

Worked example

Given

  • Usefactor\text{Use}_{\text{factor}} = 0.85 —
  • VLLV_{\text{LL}} = 100 V
  • PF\mathrm{PF} = 0.85 —
  • II = 0.85 A
q3ph=3×100×0.85×0.85×3.412×0.85≈362.9q_{\text{3ph}} = \sqrt{3} \times 100 \times 0.85 \times 0.85 \times 3.412 \times 0.85 \approx 362.9

Symbols and units

SymbolMeaningUnit
q3phq_{\text{3ph}}3-phase electric heat rateBtu/h
Usefactor\text{Use}_{\text{factor}}operating time fraction—
VLLV_{\text{LL}}line-to-line voltageV
PF\mathrm{PF}power factor—
IIline currentA

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