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8 Cards in this Set
- Front
- Back
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Emmissive Power
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total rate of energy lost from a surface due to radiation heat transfer per unit area: function of the absolute temperature and emissivity
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Emissivity
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ratio of total emissive power from a real surface relative to a blackbody
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Absorptivity
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fraction of irradiation that is absorved by surface
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Diffuse Irradiation
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radiant energy that is arriving at the surface and is the sum of emission and reflection from other surfaces in the enclosure and is independent of angle (direction).
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Blackbody Irradiation
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radiant energy has the spectral distribution of a blackbody so that the irradiation is equal to the emissive power of a black body at the same temperature.
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Surface Properties of Gray Surface
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Emission and reflection are independent of wavelength
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Surface Properties of Diffuse Surface
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Emission and reflection are independent of direction
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Radiosity (J)
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sum of emissive power and reflected irradiation from a surface.
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