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An infinitely long function 0.5 m × 0.4 m cross section is shown in the figure below. Consider all surfaces of the furnace to be black. The top and bottom walls are maintained at temperature T1 = T3 = 927°C while the side walls are attemperature T2 = T4 = 527°C. The view factor, F1 - 2 is 0.26.The net radiation heat loss or gain on side 1 is ______ W/m.
Stefan-Boltzmann constant = 5.67 × 10-8 W/ m2K4.
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- 24530.688
- 24530.6
- 24530.68
- 24530
Correct Option: A
T1 = 927°C = 1200 K,
T2 = 527°C = 800 K,
F12 = F14 = 0.26
F11 + F12 + F13 + F14 = 1
F13 = 0.48
Q = Q12 + Q13 + Q14
Q13 = 0 since the temperatures are same
Q = Q12 + Q14 = 2 × σb × A × F12 ×(T14 - T24)
Q = 2 × 5.67 × 10-8 × (0.5 × 1) × 0.26 × (12004 – 8004)
= 24530.688
