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THE FEUTEX TOOLKIT

Radiative Equilibrium Surface

Estimate equilibrium temperature from absorbed flux and radiation to surroundings.

Thermal workspace● Runs in your browser
01 Your input
02 Your result
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FormulaαG=εσ(T⁴−Tsur⁴).
Sources and model references

Worked example

Inputs

Incident radiant flux
1000 W/m²
Absorptivity
0.8
Emissivity
0.8
Radiative surroundings temperature
300 K

Expected results

Equilibrium absolute temperature
400.5283263 K
Absorbed flux
800 W/m²

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "flux": 1000,
  "absorptivity": 0.8,
  "emissivity": 0.8,
  "ambient": 300
}

Accuracy and scope

One radiating area equal to illuminated area; no convection, conduction, spectral dependence or internal heat generation. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.