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EP-13-2-Solution-1

EP-13-2-Solution-1 - LEARNING MODULE 13 EXAMPLE PROBLEM 2...

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LEARNING MODULE 13 EXAMPLE PROBLEM 2 Scaling Arguments in Heat Transfer – proving it with numbers For the scenario given in Example Problem 1, assume that for equal flow rates of hot and cold streams, say 500 m 3 /hr, the individual heat transfer coefficients for water are 3000W/m 2 - o C on both the shell and tube side. Now assume you double the flow rate in the cooling water stream. Let the tubes have an inside diameter of 13mm and an outside diameter of 16mm. Prove that the overall heat transfer coefficient is greater if the cooling water is placed on the inside of the tubes and the process water is placed on the outside of the tubes. SOLUTION 1. Calculate “U” for the base case at 500 m 3 /hr: i i o o o h D D h U 1 1 1 ignoring the barrier as negligible and constant for all scenarios. Then: C m W h D D h U o i i o o o 
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