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Radiosity (heat transfer)

 

 
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Radiosity (heat transfer)
 
 
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In the fields of optics
Optics

Optics is the study of the behavior and properties of light including its optical phenomena with matter and its imaging by optical instruments....
 and heat transfer
Heat transfer

Heat transfer is the transition of thermal energy or simply heat from a hotter object to a cooler object . When an object or fluid is at a different temperature than its thermodynamic system or another object, transfer of thermal energy, also known as heat transfer, or heat exchange, occurs in such a way that the body and the surround...
, radiosity is the total emitted and reflected radiation leaving a surface.

The diffuse radiosity (J) is the integral of the hemispherical spectral radiosity over the spectrum:

where is equal to integral over the hemispherical solid angle
Solid angle

The solid angle, O, is the angle in three-dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point....
 of the sum of emitted and reflected radiant intensities
Radiant intensity

In radiometry, radiant intensity is a measure of the intensity of electromagnetic radiation. It is defined as power per unit solid angle. The SI unit of radiant intensity is watts per steradian ....
.

The radiosity method is used to solve for the radiative heat transfer
Radiative heat transfer

In radiative heat transfer, heat is transferred between bodies by electromagnetic radiation. In natural radiative heat transfer , the spectrum of this radiation is that of a black body, and its power depends on the fourth power of the absolute temperature of the body....
 between a number of surfaces.






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Encyclopedia


In the fields of optics
Optics

Optics is the study of the behavior and properties of light including its optical phenomena with matter and its imaging by optical instruments....
 and heat transfer
Heat transfer

Heat transfer is the transition of thermal energy or simply heat from a hotter object to a cooler object . When an object or fluid is at a different temperature than its thermodynamic system or another object, transfer of thermal energy, also known as heat transfer, or heat exchange, occurs in such a way that the body and the surround...
, radiosity is the total emitted and reflected radiation leaving a surface.

The diffuse radiosity (J) is the integral of the hemispherical spectral radiosity over the spectrum:

where is equal to integral over the hemispherical solid angle
Solid angle

The solid angle, O, is the angle in three-dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point....
 of the sum of emitted and reflected radiant intensities
Radiant intensity

In radiometry, radiant intensity is a measure of the intensity of electromagnetic radiation. It is defined as power per unit solid angle. The SI unit of radiant intensity is watts per steradian ....
.

The radiosity method is used to solve for the radiative heat transfer
Radiative heat transfer

In radiative heat transfer, heat is transferred between bodies by electromagnetic radiation. In natural radiative heat transfer , the spectrum of this radiation is that of a black body, and its power depends on the fourth power of the absolute temperature of the body....
 between a number of surfaces. This method requires the solution of a system of simultaneous equations using matrix methods because the radiation hitting each surface is determined by the temperatures of all the other surfaces.

See also

  • Irradiance
    Irradiance

    Irradiance, radiant emittance, and radiant exitance are radiometry terms for the power of electromagnetic radiation at a surface, per unit area....
  • Radiant flux
    Radiant flux

    In radiometry, radiant flux or radiant power is the measure of the total Power of electromagnetic radiation . The power may be the total emitted from a source, or the total landing on a particular surface....
  • Radiosity
    Radiosity

    Radiosity is a global illumination algorithm used in 3D computer graphics rendering . Radiosity is an application of the finite element method to solving the rendering equation for scenes with purely diffuse surfaces....
     (computer graphics)