Oxide-metal periphery area

Example 2.2 Oxidized copper 3" x 3" billets are being heated in an electrically heated furnace that has an average heat source temperature of 1600 F. The refractory area is five times the exposed metal area. The loading arrangement is such that the equivalent exposure to furnace radiation is only 6 in. of the 12" periphery of each billet. The billet weight is 34.9 Ib/ft of length. 

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