Ethanol is vaporized at 78°C (h fg = 846 kJ/kg) in a double-pipe parallel-flow heat exchanger at

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Ethanol is vaporized at 78°C (hfg= 846 kJ/kg) in a double-pipe parallel-flow heat exchanger at a rate of 0.03 kg/s by hot oil (cp= 2200 J/kg·K) that enters at 120°C. If the heat transfer surface area and the overall heat transfer coefficients are 6.2 m2and 320 W/m2·K, respectively, determine the outlet temperature and the mass flow rate of oil using

(a) The LMTD method

(b) The ε-NTU method.

Oil 120°C Oil Ethanol 78°C 0.03 kg/s

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Fundamentals of Thermal-Fluid Sciences

ISBN: 978-0078027680

5th edition

Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala

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