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The surface of two circular discs parallel to each other, each with 1m2 area, are exchanging thermal radiation with each other and with the surrounding walls. The temperatures of disc 1, disc 2 and the walls are 800 K, 500 K and 300 K respectively. The shape factor between discs is 0.5. Compute with help of network analysis the net radiative heat transfer between the two discs.

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