Thermodynamics HW Solutions 905

Thermodynamics HW Solutions 905 - Chapter 12 Radiation Heat...

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Chapter 12 Radiation Heat Transfer 12-5 An enclosure consisting of six surfaces is considered. The number of view factors this geometry involves and the number of these view factors that can be determined by the application of the reciprocity and summation rules are to be determined. 6 5 4 3 2 1 Analysis A seven surface enclosure (N=6) involves N 22 6 = = 36 view factors and we need to determine 15 2 ) 1 6 ( 6 2 ) 1 ( = = N N view factors directly. The remaining 36-15 = 21 of the view factors can be determined by the application of the reciprocity and summation rules. 12-6 An enclosure consisting of five surfaces is considered. The number of view factors this geometry involves and the number of these view factors that can be determined by the application of the reciprocity and summation rules are to be determined. 2 1 4 5 3 Analysis A five surface enclosure (N=5) involves
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