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Calculation Involving Radiation View Factors

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A cross section through a tunnel containing two long parallel straight pipes of diameter, D, and distance, L, between their centers. The direct radiation factor between two such pipes is given by the equation in the attached file. Find the rate of heat loss per meter run from each pipe if pipe 1 has a temperature of 450 K and emissivity of 0.7, pipe 2 has a temperature 400 K and emissivity 0.8 and the tunnel wall has a temperature 300 K and is black. Assumptions given in attachment.
Calculation invloving Radiation View Factor (involving black body & grey body shape factors) see attached file.

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The expert examines calculations involving radiation view factors.

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