Radiation Heat Transfer

Since all bodies continuously emit thermal radiation and absorb radiation from other bodies around them, both the received and emitted energy (combining emitted, received, and reflected energies) must be considered when determining the temperature state of a body. This total energy interchange between bodies is significantly affected by the nature of the bodies and the conditions in which these bodies exist. The ability of a body to absorb and emit energy is measured by its emissivity, the fraction absorbed or emitted compared to an ideal perfect radiator or so-called blackbody that has an emissivity (e) of 1.0. It has been determined that the amount of energy emission from a body is proportional to the fourth power of the absolute temperature. A heat transfer equation can be balanced by the experimentally determined proportionality constant known as the Stefan-Boltzmann constant (cr), hence, for a blackbody

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