dA n 8 dA cos R do,i dA, dA A.T FIGURE 13.I View factor associated with radiation exchange between elemental sur- faces of area dA;and dA. 92< 2 02
Continued For enclosed surfaces ∑F=1 j=1 For concave surfaces F≠0
Continued For enclosed surfaces 1 1 , = = N j Fi j For concave surfaces 0 Fi,i ≠