Question

8-47 In an air heating system, heated air at 40 C and105 kPa absolute is distributed through a 0.2 m x 0.3 m rectangular đuct made of commercial steel at

a rate of0.5 m/s. Determine the pressure drop and head loss through a 40-m-long section of the duct. Answers: 124 Pa, 10.8 m

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