A 4-in. schedule 80 steel pipe (ID = 3.826 in., OD = 4.5 in.) carries a heat-transfer fluid at 600 F and is covered with a 1/2 -in. thick layer of pipe insulation. The pipe is surrounded by air at 80 F. The vendor’s literature states that a 1-in. thick layer of the pipe insulation has an R-value of 3. Neglecting convective resistances, the resistance of the pipe wall, and thermal radiation, estimate the rate of heat loss from the pipe per foot of length.

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A 4-in. schedule 80 steel pipe (ID = 3.826 in., OD = 4.5 in.) carries a heat-transfer fluid at 600 F and is covered with a 1/2 -in. thick layer of pipe insulation. The pipe is surrounded by air at 80 F. The vendor’s literature states that a 1-in. thick layer of the pipe insulation has an R-value of 3. Neglecting convective resistances, the resistance of the pipe wall, and thermal radiation, estimate the rate of heat loss from the pipe per foot of length.

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