Problem $13\mathrm{.}091-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL THE PARTS

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A thin aluminum sheet with an emissivity of $0\mathrm{.}26$ on both sides is placed between two very large parallel plates, which are maintained at uniform temperatures T$1=895$ K and T$2=650$ K and have emissivities $1=0\mathrm{.}5$ and $2=0\mathrm{.}8,$ respectively.

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Problem $13\mathrm{.}091.$c $-$ Comparing the two heat transfer rates

Determine the ratio of$$radiation heat transfer between the two plates per unit surface area of the plates, with and without the shield.

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