enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Emissivity - Wikipedia

    en.wikipedia.org/wiki/Emissivity

    The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. Thermal radiation is electromagnetic radiation that most commonly includes both visible radiation (light) and infrared radiation, which is not visible to human eyes.

  3. Low emissivity - Wikipedia

    en.wikipedia.org/wiki/Low_emissivity

    As it is an opaque material, the remaining 10 percent must be reflected. Conversely, a low-e material such as aluminum foil has a thermal emissivity/absorptance value of 0.03 and as an opaque material, the thermal reflectance value must be 1.0 - 0.03 =0.97, meaning it reflects 97 percent of radiant thermal energy. Low-emissivity building ...

  4. Thermal emittance - Wikipedia

    en.wikipedia.org/wiki/Thermal_emittance

    Thermal emittance or thermal emissivity is the ratio of the radiant emittance of heat of a specific object or surface to that of a standard black body.Emissivity and emittivity are both dimensionless quantities given in the range of 0 to 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions, but emissivity refers to a material property ...

  5. List of materials properties - Wikipedia

    en.wikipedia.org/wiki/List_of_materials_properties

    A material property is an intensive property of a material, i.e., a physical property or chemical property that does not depend on the amount of the material. These quantitative properties may be used as a metric by which the benefits of one material versus another can be compared, thereby aiding in materials selection.

  6. Selective surface - Wikipedia

    en.wikipedia.org/wiki/Selective_surface

    Although ordinary black paint has high solar absorption, it also has high thermal emissivity, and thus it is not a selective surface. Typical values for a selective surface might be 0.90 solar absorption and 0.10 thermal emissivity, but can range from 0.8/0.3 for paints on metal to 0.96/0.05 for commercial surfaces.

  7. Multi-layer insulation - Wikipedia

    en.wikipedia.org/wiki/Multi-layer_insulation

    The golden areas are MLI blankets on the Mars Reconnaissance Orbiter. The principle behind MLI is radiation balance. To see why it works, start with a concrete example - imagine a square meter of a surface in outer space, held at a fixed temperature of 300 K (27 °C; 80 °F), with an emissivity of 1, facing away from the sun or other heat sources.

  8. Kirchhoff's law of thermal radiation - Wikipedia

    en.wikipedia.org/wiki/Kirchhoff's_law_of_thermal...

    Average and overall absorptivity and emissivity data are often given for materials with values which differ from each other. For example, white paint is quoted as having an absorptivity of 0.16, while having an emissivity of 0.93. [13]

  9. Emittance - Wikipedia

    en.wikipedia.org/wiki/Emittance

    English. Read; Edit; View history; Tools. Tools. move to sidebar hide. Actions Read; ... Thermal emittance, emissivity of a surface This page was last edited on 25 ...