Two convex objects are inside a large vacuum enclo- sure whose walls are maintained at T3 = 300 K. The objects have the same area, 0.2 m2, and the same emis- sivity, 0.2. The view factor from object 1 to object 2 is F12 = 0.3. Embedded in object 2 is a heater that generates 400 W. The temperature of object 1 is maintained at T1 = 200 K by circulating a fluid through channels machined into it.
At what rate must heat be supplied (or removed) by the fluid to maintain the desired temperature of object 1? What is the temperature of object 2?