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QUESTION 1 A cylindrical air duct of 24 cm in diameter and 10 m in length carries 5C cold air at 10 m/s. The duct

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QUESTION 1 A cylindrical air duct of 24 cm in diameter and 10 m in length carries 5C cold air at 10 m/s. The duct wall temperature is fixed at 15C. Determine the heat gained by the air through this duct. Given that the air density is 1.25 kg/m3, the specific heat of air is 1 kJ/kg.K. the thermal conductivity of air is 0.025 W/m.K, the kinematic viscosity of air is 14.16 mm2/s. [6 marks]

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