A heating element in the shape of a cylinder is maintained at 2000 F and placed at the center of a half-cylindrical reflector as shown. The rod diameter is 2 in. and that of the reflector is 18 in....

A heating element in the shape of a cylinder is maintained at 2000F and placed at the center of a half-cylindrical reflector as shown. The rod diameter is 2 in. and that of the reflector is 18 in. The emissivity of the heater surface is 0.8, and the entire assembly is placed in a room maintained at 70F. What is the radiant energy loss from the heater per foot of length? How does this compare to the loss from the heater without the reflector present?