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Question: problem 4 a thin aluminum sheet with an emissivity of...

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Problem 4 A thin aluminum sheet with an emissivity of 0.15 on both sides is placed between two very large parallel plates, which are maintained at uniform temperatures T 900 K and T, = 650 K and have emissivities ε] = 0.5 and ε2 = 0.8, respectively. Determine the net rate of radiation heat transfer between the two plates per unit surface area of the plates and compare the result with that without the shield. 71 900 K T2 650 K :08 FIGURE P13-64 Note that all the view factors in this problem are equal to 1.0. These are infinite plates.

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