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Question 1 Calculate the heat exchange surface area required in a heat exchanger comprised of tubes with an external diameter of 25 mm in order to cool a solution of ethyl alcohol (mass flow rate kg/h, heat capacity: 3.8 kJ/kg K) from 65 C to 40 °C using a water flow (mass flow rate: 22,680 kg/h, 24,948 , heat capacity: 4.18 kJ/kg K) entering at 5 °C. The overall heat transfer coefficient related to the outside tube surface is 566 W/mK. Consider the following cases: a) b) Counter-flow in a double-pipe exchanger Shell and tube heat exchanger with 2 shell-passes and 72 tube-passes. The ethyl alcohol flows in the shell and the water in the tubes. 1.0 0.9 0.8 0.7 R:40 3.0 20 5 1008 06 0402 2 R: 0.5 00.10.20.30.4 0.5 0.6 07 08 0.9 10 P=

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Answer #1

ma 22680 i 5 244HE x 3:8 x (65-40) - 3600 22680 xy18 (to-s 36ee- ATAT2 LMTD fails 300 724q eXLC Pag is mou than ou hence LMTO we have tkndu sins -t 30 5 65- S 60 JOM 6f3 658.3s

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