ClarityHow to use this tool
- Enter emissivity, surface area, surface temperature, surroundings temperature.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
Net power = εσA(Tsurface⁴−Tsurroundings⁴), with σ=5.670374419×10⁻⁸ W m⁻² K⁻⁴.
Using emissivity = 0.9, surface area = 1 m², surface temperature = 400 K, surroundings temperature = 300 K, the result is 893.083971 W. Change these example inputs to match your task; use the method above to check each step.
Understanding your result
Diffuse gray surface viewing a large environment with view factor one. Negative output means net heat gain.
What to keep in mind
Diffuse gray surface viewing a large environment with view factor one. Negative output means net heat gain. An idealized educational model using the stated SI units. Real systems may need additional forces, losses or experimental measurements. Not a safety or equipment specification.
Common questions
How do I use this stefan boltzmann radiation calculator?
Estimate net radiative heat flow from a surface to a large isothermal environment. Enter emissivity, surface area in m², surface temperature in K, surroundings temperature in K. The starting example is editable; use values for the same system or project.
Which assumptions affect this result?
Diffuse gray surface viewing a large environment with view factor one. Negative output means net heat gain.
Methodology maintained by ClarityKit. How these tools are built and checked.