A numerical technique is presented for evaluating the geometrical radiant exchange factors (also called shape or view factors) between surfaces with interposed obstructions. Since the program is developed for plane surfaces, arbitrary surfaces are expressed by the juxtaposition of plane surfaces; to simplify the input and output, the program respectively combines and decomposes these elemental surfaces. The data input format, although designed for manual input, is ideally suited for standard three-dimensional mesh-generated programs. When obstructions are not present, the calculated exchange factors are accurate to within tenths of a percent; but when obstructions are present, the accuracy depends on the …
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Sandia National Labs., Livermore, CA (USA)
Place of Publication:
Livermore, California
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Description
A numerical technique is presented for evaluating the geometrical radiant exchange factors (also called shape or view factors) between surfaces with interposed obstructions. Since the program is developed for plane surfaces, arbitrary surfaces are expressed by the juxtaposition of plane surfaces; to simplify the input and output, the program respectively combines and decomposes these elemental surfaces. The data input format, although designed for manual input, is ideally suited for standard three-dimensional mesh-generated programs. When obstructions are not present, the calculated exchange factors are accurate to within tenths of a percent; but when obstructions are present, the accuracy depends on the nature of the problem, the refinement of the elemental area mesh, and the amount of computation called for by the user. This program has been adapted for solving central-receiver cavity problems.
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