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Non Ideal Body Surface Emittance Formula

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Real surface radiant surface emittance is the emittance by the normal objects (non black body). Check FAQs

e = ε \cdot [Stefan-BoltZ] \cdot {T w}^{4}

e - Real Surface Radiant Surface Emittance?ε - Emissivity?T_w - Surface Temperature?[Stefan-BoltZ] - Stefan-Boltzmann Constant?

Non Ideal Body Surface Emittance Example

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Here is how the Non Ideal Body Surface Emittance equation looks like with Values.

Here is how the Non Ideal Body Surface Emittance equation looks like with Units.

Here is how the Non Ideal Body Surface Emittance equation looks like.

466.1591 = 0.95 \cdot 5.7E-8 \cdot 305^{4}

466.1591W/m² = 0.95 \cdot 5.7E-8 \cdot {305K}^{4}

466.1591 = 0.95 \cdot 5.7E-8 \cdot 305^{4}

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Non Ideal Body Surface Emittance Solution

Follow our step by step solution on how to calculate Non Ideal Body Surface Emittance?

FIRST Step Consider the formula

e = ε \cdot [Stefan-BoltZ] \cdot {T w}^{4}

Next Step Substitute values of Variables

∴

e = 0.95 \cdot [Stefan-BoltZ] \cdot {305K}^{4}

Next Step Substitute values of Constants

∴

e = 0.95 \cdot 5.7E-8 \cdot {305K}^{4}

Next Step Prepare to Evaluate

∴

e = 0.95 \cdot 5.7E-8 \cdot 305^{4}

Next Step Evaluate

∴

e = 466.159061868529W/m²

LAST Step Rounding Answer

∴

e = 466.1591W/m²

Non Ideal Body Surface Emittance Formula Elements

Variables

Constants

Real Surface Radiant Surface Emittance

Real surface radiant surface emittance is the emittance by the normal objects (non black body).

Symbol: e

Measurement: Heat Flux DensityUnit: W/m²

Note: Value can be positive or negative.

Formulas to find Real Surface Radiant Surface Emittance

Emissivity

Emissivity is the ability of an object to emit infrared energy. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic or oxidized surfaces have emissivity close to 0.95.

Symbol: ε

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Emissivity

Surface Temperature

Surface Temperature is the temperature at or near a surface. Specifically, it may refer to as Surface air temperature, the temperature of the air near the surface of the earth.

Symbol: T_w

Measurement: TemperatureUnit: K

Note: Value can be positive or negative.

Formulas to find Surface Temperature

Stefan-Boltzmann Constant

Stefan-Boltzmann Constant relates the total energy radiated by a perfect black body to its temperature and is fundamental in understanding blackbody radiation and astrophysics.

Symbol: [Stefan-BoltZ]

Value: 5.670367E-8

Other formulas in Conduction, Convection and Radiation category

Go Black Bodies Heat Exchange by Radiation

q = ε \cdot [Stefan-BoltZ] \cdot A \cdot ({T 1}^{4} - {T 2}^{4})

Go Heat Exchange by Radiation due to Geometric Arrangement

q = ε \cdot A \cdot [Stefan-BoltZ] \cdot SF \cdot ({T 1}^{4} - {T 2}^{4})

Go Radiation energy emitted by black body per unit time and surface area

q' = [Stefan-BoltZ] \cdot T^{4}

Go Radiation energy emitted by black body in time interval given emissive power

E = E b \cdot SA \cdot N

How to Evaluate Non Ideal Body Surface Emittance?

Non Ideal Body Surface Emittance evaluator uses Real Surface Radiant Surface Emittance = Emissivity*[Stefan-BoltZ]*Surface Temperature^(4) to evaluate the Real Surface Radiant Surface Emittance, Non ideal body surface emittance is defined as the emission released by non black body objects therefire real bodies. Real Surface Radiant Surface Emittance is denoted by e symbol.

How to evaluate Non Ideal Body Surface Emittance using this online evaluator? To use this online evaluator for Non Ideal Body Surface Emittance, enter Emissivity (ε) & Surface Temperature (T_w) and hit the calculate button.

FAQs on Non Ideal Body Surface Emittance

What is the formula to find Non Ideal Body Surface Emittance?

The formula of Non Ideal Body Surface Emittance is expressed as Real Surface Radiant Surface Emittance = Emissivity*[Stefan-BoltZ]*Surface Temperature^(4). Here is an example- 466.1591 = 0.95*[Stefan-BoltZ]*305^(4).

How to calculate Non Ideal Body Surface Emittance?

With Emissivity (ε) & Surface Temperature (T_w) we can find Non Ideal Body Surface Emittance using the formula - Real Surface Radiant Surface Emittance = Emissivity*[Stefan-BoltZ]*Surface Temperature^(4). This formula also uses Stefan-Boltzmann Constant .

Can the Non Ideal Body Surface Emittance be negative?

Yes, the Non Ideal Body Surface Emittance, measured in Heat Flux Density can be negative.

Which unit is used to measure Non Ideal Body Surface Emittance?

Non Ideal Body Surface Emittance is usually measured using the Watt per Square Meter[W/m²] for Heat Flux Density. Kilowatt per Square Meter[W/m²], Watt per Square Centimeter[W/m²], Watt per Square Inch[W/m²] are the few other units in which Non Ideal Body Surface Emittance can be measured.

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