Alarge furnace in a heat treatment factory is located in close proximity to another large piece of equipment. both the furnace and equipment are large enough that the gap between them can be characterized by two infinitely-large parallel plates. it is critical that the surfacetemperatureof the equipment(ε=0.5)remains at a steady450k. the surface temperature of the furnace wall(ε=0.8)is 800k. to block radiation, you build a radiation shield that consists of 5 identical thin aluminum sheets, each with an emissivity of ε=0.1 on both sides. the aluminum sheets are positioned with thin gaps between them. calculate the net rate of radiation heattransfer, per unit area, between the furnace wall and equipment surface with 0, 1, and all 5 ofthese radiation shields in placefor these temperature conditions.