ClueLuma

Total heat-transfer rate calculator

Total heat rate equals heat flux times the heat-transfer area.

Units
Qtotal=U×A×ΔTQ_{\text{total}} = U \times A \times \Delta T

Calculator

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

Btu/(h·ft²·°F)
ft²
°F
Btu/h

Worked example

Given

  • UU = 0.12 Btu/(h·ft²·°F)
  • AA = 1,450 ft²
  • ΔT\Delta T = 65 °F
Qtotal=0.12×1450×65=11,310Q_{\text{total}} = 0.12 \times 1450 \times 65 = 11{,}310

Symbols and units

SymbolMeaningUnit
QtotalQ_{\text{total}}total heat-transfer rateBtu/h
UUoverall conductanceBtu/(h·ft²·°F)
AAsurface areaft²
ΔT\Delta Ttemperature difference°F

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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.