Science
Wien peak wavelength
Find the wavelength of maximum blackbody spectral radiance per unit wavelength from absolute temperature; the frequency-spectrum peak is different.
Calculators / Science / Net thermal radiation
Net thermal radiation calculator
Estimate net radiated power exchanged with large surroundings from emissivity, surface area and the difference of fourth powers of absolute temperatures.
On this page
Net radiated power893.08W
Calculator controls
How to calculate
Estimate net radiated power exchanged with large surroundings from emissivity, surface area and the difference of fourth powers of absolute temperatures.
Net radiated power = eps*5.670374419e-8*a*(T^4-S^4) W
Worked example
Emissivity: 0.9; Surface area (m²): 1; Surface temperature (K): 400; Surroundings temperature (K): 300.
Net radiated power: 893.08 W.
Assumptions and limits
Estimate net radiated power exchanged with large surroundings from emissivity, surface area and the difference of fourth powers of absolute temperatures. Grey surface radiating to large uniform surroundings, with view factor 1. A negative result means net heat absorption. Temperatures must be absolute kelvin.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate net radiated power exchanged with large surroundings from emissivity, surface area and the difference of fourth powers of absolute temperatures.
When this tool is useful
Net radiated power = eps*5.670374419e-8*a*(T^4-S^4) W
Understanding your inputs
| Input | What to enter |
|---|---|
| Emissivity | Enter a number of at least 0 and no more than 1. |
| Surface area (m²) | Enter a number of at least 0 and no more than 1000000000000. |
| Surface temperature (K) | Enter a number of at least 1e-12 and no more than 1000000000000. |
| Surroundings temperature (K) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Estimate net radiated power exchanged with large surroundings from emissivity, surface area and the difference of fourth powers of absolute temperatures. Grey surface radiating to large uniform surroundings, with view factor 1. A negative result means net heat absorption. Temperatures must be absolute kelvin.
How is the result calculated?
Net radiated power = eps*5.670374419e-8*a*(T^4-S^4) W