**SUMMA****R****Y**

Radiaton heat transfer between surfaces depends on the orientation of the surfaces relative to each other, the effects of orientation are accounted for by the geometric parameter *vie**w factor. *The *view factor *from a surface *i *to a surface *j* is denoted by *F**i *® *j *or *F**ij*, and is defined as the fraction of the radiation leaving surface *i *that strikes surface *j *directly. The view factors between differential and finite surfaces are expressed as *differential view factor *is expressed as

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