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A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78F, h=2 Btu/h · ft2 · F, the surface emissivity is 0.9, and the cylinder is placed in a large room where the air temperature is 68?F and the wall temperature is 45F. Calculate the heat lost from the cylinder. Repeat for a wall temperature of 80F. What do you conclude from these calculations?

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