Cold conditioned air at 12°C is flowing inside a1.5-cm-thick square aluminum (k 5 237 W/m·K) duct ofinner cross section 22 cm 3 22 cm at a mass flow rate of0.8 kg/s. The duct is exposed to air at 33°C with a combinedconvection-radiation heat transfer coefficient of 13 W/m2·K. The convection heat transfer coefficient at the inner surfaceis 75 W/m2·K. If the air temperature in the duct should notincrease by more than 1°C determine the maximum length ofthe duct.

answer:

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Explanation:

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