A room measuring 5 m 5 m 2 m high has the celling covered with electric heating panels. If the ceiling surface temperature is maintained at 45°C and the walls are at 25°C in equilibrium condition,...

A room measuring 5 m

5 m

2 m high has the celling covered with electric heating panels. If the ceiling surface temperature is maintained at 45°C and the walls are at 25°C in equilibrium condition, estimate the total heat loss from the ceiling by radiation. The emissivities of the ceiling and the walls are 0.75 and 0.65 respectively. Assume the floor to be non-sensitive to radiation.