1. A circular furnace has 2 end black surfaces, surface 1 is kept at 400 K and surface 2 is kept at 800 K. The diameter and the length of the furnace are 0.5meters. Both end plates are connected by a reradiating insulated wall (surface 3). Answer the following questions: (a) Compute the view factors F12 and F3? (b) Draw the radiation network for this problem (c) What is the temperature of the reradiating wall, (surface 3)? (d) What is the net heat transfer from surface 1? [4 points] [3 points] [4 points] [4 points]