A thin-walled double-pipe heat exchanger is to be used to cool oil (cp= 2500 J/kg-K) from 80°C to 50°C at a rate of 5 kg/s by water (cp= 4200 J/kg-K) that enters at 20°C at a rate of 2 kg/s. The diameter and length of the tube considered for the heat exchanger is 2.5 cm and 2 meters. The convective heat transfer coefficients for the oil and water are assumed to be ho = 400; and W m²c hw=600- respectively. W m² a. Determine if a parallel or counter flow heat exchanger should be used in this case (tell reason and show calculation) b. Using LMTD method, determine the number of pipes required for the heat exchanger

A thin-walled double-pipe heat exchanger is to be used to cool oil (cp= 2500 J/kg-K) from 80°C to 50°C at a rate of 5 kg/s by water (cp= 4200 J/kg-K) that enters at 20°C at a rate of 2 kg/s. The diameter and length of the tube considered for the heat exchanger is 2.5 cm and 2 meters. The convective heat transfer coefficients for the oil and water are assumed to be ho = 400; and W m²c hw=600- respectively. W m² a. Determine if a parallel or counter flow heat exchanger should be used in this case (tell reason and show calculation) b. Using LMTD method, determine the number of pipes required for the heat exchanger

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

A thin-walled double-pipe heat exchanger is to be used to cool oil (cp= 2500 J/kg-K) from 80°C to
50°C at a rate of 5 kg/s by water (cp= 4200 J/kg.K) that enters at 20°C at a rate of 2 kg/s.
The diameter and length of the tube considered for the heat exchanger is 2.5 cm and 2 meters. The
convective heat transfer coefficients for the oil and water are assumed to be ho = 400- and
W
m²c
W
hw = 600 , respectively.
m²c'
a. Determine if a parallel or counter flow heat exchanger should be used in this case (tell reason
and show calculation)
b. Using LMTD method, determine the number of pipes required for the heat exchanger

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