GATE Mechanical Engineering (ME) 2014 Shift 2 Solved Paper

A hemispherical furnace of 1 m radius has the inner surface (emissivity, ε = 1) of its roof maintained at 800 K, while its floor (ε = 0.5) is kept at 600 K. Stefan-Boltzmann constant is 5.668 × 10^-8 W/m². K⁴. The net radiative heat transfer (in kW) from the roof to the floor is _______