Air that is fully-developed flows in a rectangular duct of inside dimensions 0.610 m x 0.305 m. The inlet air temperature is 21.1°C, and at outlet the air temperature is 26.7°C. If the mass flow of air is 2.72kg/h and the duct length is 2.44 m, calculate (a) the required heat in the form of a constant wall flux to heat the air and (b) the pressure drop due to friction. Also, solve for (c) h and (d) Ts,i.

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