(b) Consider a cubical furnace with a side length of 3 m as shown in Figure Q. 4(b). The top (surface 1) is maintained a

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B Consider A Cubical Furnace With A Side Length Of 3 M As Shown In Figure Q 4 B The Top Surface 1 Is Maintained A 1 (100.04 KiB) Viewed 45 times

(b) Consider a cubical furnace with a side length of 3 m as shown in Figure Q. 4(b). The top (surface 1) is maintained at 700 K. The base (surface 2) has an emissivity of 0.90 and is maintained at 950 K. The side (surface 3) is black and is maintained at 450 K. Heat is supplied from the base surface at a rate of 340 kW. Determine: (i) all view factors; [4 marks) (ii) the radiosities J1, J2 and 13 and the emissivity of the top surface and, [12 marks] (iii) the net rates of heat transfer between the top and the bottom surfaces, and between the bottom and side surfaces. [4 marks] 3 m Ti = 700 K 132 T3 = 450 K 83 = 1 T2 = 950 K &=0.90 Figure Q. 4(b).