1) Determine the view factors F13 and F23 between the rectangular surfaces shown in 1m 1.5m 2 m 2) If the plates are maintained at uniform temperatures T =800 K and T = 500 K, T3 = 200 K and have emissivities & = 0.2 and E2=0.7, E3=0.1 respectively, Determine the net rate of radiation heat transfer between a) the surfaces land 3. b) the surfaces 2 and 3.