(a) Explanation The following figure shows the heat exchanger for applying steady flow energy equation. Figure-(1) Write the expression for enthalpy at section (1) in terms of dryness fraction. h 1 = h f 1 + x 1 ( h g 1 − h f 1 ) x 1 = h 1 − h f 1 h g 1 − h f 1 (I) Here, liquid enthalpy at section (1) is h f 1 , enthalpy of liquid vapor mixture at section (1) is h f g 1 , and dryness fraction is x 1 . Conclusion: Refer to table A − 3 “Properties of Saturated Water” to obtain the values of liquid enthalpy 376.70 kJ / kg and vapor enthalpy 2660.0 kJ / kg at pressure 7 bar (b) To determine The rate of heat transfer from the heat exchanger to the surrounding.

8th Edition

ISBN: 2818440116926

Author: MORAN

Publisher: WILEY CONS

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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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Question

Chapter 4.12, Problem 80P

(a)

To determine

The dryness fraction of the entering steam.

(b)

To determine

The rate of heat transfer from the heat exchanger to the surrounding.

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Chapter 4.12, Problem 79P

Chapter 4.12, Problem 83P

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