A hemispherical furnace of 1 m radius has the inner surface (emissivity, = 1) of its roof maintained at 800 K, while its floor ( = 0.5) is kept at 600 K. Stefan-Boltzmann constant is 5.668 110-8W/m2K4. The net radiative heat transfer (in kW) from the roof to the floor is _______.

A hemispherical furnace of 1 m radius has the inner surface (emissivit

1.	A hemispherical furnace of 1 m radius has the inner surface (emissivity, = 1) of its roof maintained at 800 K, while its floor ( = 0.5) is kept at 600 K. Stefan-Boltzmann constant is 5.668 110-8W/m2K4. The net radiative heat transfer (in kW) from the roof to the floor is _______.
A.	22 kW.
B.	25 kW.
C.	24.9 kW.
D.	24. kW.
Answer» D. 24. kW.

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A hemispherical furnace of 1 m radius has the inner surface (emissivity, = 1) of its roof maintained at 800 K, while its floor ( = 0.5) is kept at 600 K. Stefan-Boltzmann constant is 5.668 110-8W/m2K4. The net radiative heat transfer (in kW) from the roof to the floor is _______.

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