A radiant heating system is installed in the plastered ceiling of a room 5 m 5 m 3 m high. The temperature of the con crete floor is maintained at 27°C. Assume that no heat flows through the walls,...

A radiant heating system is installed in the plastered ceiling of a room 5 m
5 m

3 m high. The temperature of the con crete floor is maintained at 27°C. Assume that no heat flows through the walls, which are coated with reradiating material. If the required heat supply to the room is 1.2 kW, determine the necessary temperature of the ceiling surface.