Explanation Given: T h , o = 60 ° C T h , i = 100 ° C T c , i = 15 ° C m ˙ h = 0.5 k g / h m ˙ c = 0.5 k g / h c p ( E t h y l e n e g l y c o l ) = 2650 J / k g ⋅ K c p ( W a t e r ) = 4178 J / k g ⋅ K By using the NTU method, C min = C h = m ˙ h c p , h = ( 0.5 k g / s ) ( 2650 J / k g ⋅ K ) = 1325 W / K Now, q max = C min ( T h , i − T c , i ) = ( 1325 W / K ) ( 100 − 15 ) ° C = 1

7th Edition

ISBN: 9780470501979

Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine

Publisher: Wiley, John & Sons, Incorporated

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Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

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Chapter 11, Problem 11.64P

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The exit temperature of cold water and mention the type of flow.

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Chapter 11, Problem 11.63P

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Chapter 11 Solutions

Fundamentals of Heat and Mass Transfer

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What is the main difference between a copper and a cupronickel coaxial heat exchanger, and where is each used?
Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.
10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.

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