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Net radiation method in radiative transfer

DOI: 10.1615/thermopedia.000070

NET RADIATION METHOD IN RADIATIVE TRANSFER

John R. Howell

Thermal radiation in an enclosure made up of gray-diffuse surfaces is a problem of solving a set of linear equations if some simplifying assumptions are made. The equations involve radiative heat flux, absolute temperatures, geometrv specifications, and surface properties. The necessary assumptions are as follows:

  1. All properties are temperature independent. If this is not the case, the solution becomes iterative unless the temperatures of all enclosure surfaces are specified. Otherwise, properties must be reevaluated after each iteration and new temperatures found and this process repeated until convergence.

  2. All surfaces are diffuse and gray. The assumption of diffuse surfaces allows use of configuration (shape) factors between surfaces, and the gray-diffuse assumption allows substitution of total emissivit ...

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