ClueLuma

Convection-loss estimate calculator

An empirical heat-loss estimator in the specified US units.

Units
qconv=A×0.18×(Ts−Troom)4/3q_{\text{conv}} = A \times 0.18 \times \left(T_{s} - T_{\text{room}}\right)^{4/3}

Calculator

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

°F
°F
ft²
Btu/h

Worked example

Given

  • TroomT_{\text{room}} = 70 °F
  • TsT_{s} = 150 °F
  • AA = 100 ft²
qconv=100×0.18×(150−70)4/3≈6,205q_{\text{conv}} = 100 \times 0.18 \times \left(150 - 70\right)^{4/3} \approx 6{,}205

Symbols and units

SymbolMeaningUnit
qconvq_{\text{conv}}convective heat lossBtu/h
TroomT_{\text{room}}ambient temperature°F
TsT_{s}surface temperature°F
AAexposed surface areaft²

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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.