1. Consider the scheme shown in the figure T, = 200°C for producing fresh water from salt water. The conditions are as shown in the figure. Assume that the properties of salt water are the same as those of pure water. The outer walls of heat exchanger, Heatem flash evaporator and pump can be considered as thermally insulated. The pressure drop of a continuous stream across the heat exchanger and heater are negligible. exc (ins a) Determine the ratio ("7/m.), which gives the mass fraction of salt water purified. 2 = 70 b) Determine the specific pump work, in kJ per kg of T2= liquid seawater. Liquid seawater in c) Determine the specific heat input for the heater, in kJ per kg of liquid seawater. d) Determine the specific entropy production for the flash evaporator and the heater, in kJ/K per kg of liquid seawater.

1. Consider the scheme shown in the figure T, = 200°C for producing fresh water from salt water. The conditions are as shown in the figure. Assume that the properties of salt water are the same as those of pure water. The outer walls of heat exchanger, Heatem flash evaporator and pump can be considered as thermally insulated. The pressure drop of a continuous stream across the heat exchanger and heater are negligible. exc (ins a) Determine the ratio ("7/m.), which gives the mass fraction of salt water purified. 2 = 70 b) Determine the specific pump work, in kJ per kg of T2= liquid seawater. Liquid seawater in c) Determine the specific heat input for the heater, in kJ per kg of liquid seawater. d) Determine the specific entropy production for the flash evaporator and the heater, in kJ/K per kg of liquid seawater.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

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.

Question

1.
Consider the scheme shown in the figure
T, = 200°C
for producing fresh water from salt water. The
conditions are as shown in the figure. Assume that
the properties of salt water are the same as those
of pure water. The outer walls of heat exchanger,
Heatem
flash evaporator and pump can be considered as
thermally insulated. The pressure drop of a continuous
stream across the heat exchanger and heater are
negligible.
exc
(ins
a) Determine the ratio ("7/m.), which gives the
mass fraction of salt water purified.
2 = 70
b) Determine the specific pump work, in kJ per kg of
T2=
liquid seawater.
Liquid
seawater
in
c) Determine the specific heat input for the heater, in
kJ per kg of liquid seawater.
d) Determine the specific entropy production for the
flash evaporator and the heater, in kJ/K per kg of liquid seawater.

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