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Derive an expression for the U factor if the inside and outside surfaces of the tubes...

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Mechanical Engineering

Derive an expression for the U factor if the inside and outsidesurfaces of the tubes in a heat exchanger are finned and have finefficiencies of ?i and ?o on the inside andthe outside, and Af,i and Af,o as the finnedarea on the inside and the outside, respectively, and similarlyAu,i and Au,o as the unfinned area on theinside and the outside, respectively.

Please post all steps taken. Thanks!

Answer & Explanation Solved by verified expert
4.5 Ratings (912 Votes)
In order to solve this problem I have to take some assumptionbecause the data is provided only for heat transfer by convectionand nothing has been given for conduction Hence I assume that theresistance in heat flow due to    See Answer
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