Two very large parallel plates are maintained at uniform temperatures of T1 = 1100 K and T2 = 700 K and have emissivities of ε1 = ε2 = 0.5, respectively. It is desired to reduce the net rate of radiation heat transfer between the two plates to one-fifth by placing thin aluminum sheets with an emissivity of 0.1 on both sides between the plates. Determine the number of sheets that need to be inserted.
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