(b) In a shell-and-tube heat exchanger, with one shell pass and four tube passes, water entering at 25°C and volume flowrate is being used to cool oil from 120°C. The mass flow rate of oil has recently been increased to 150 000 kg h-1. There is a total of 780 tubes of 5.0m length and 23.0mm outside diameter and 2 mm thickness. From the previous operation, the overall heat transfer coefficient of the exchanger is known to be 720 W m2K-1. Specific heat capacity of oil is 2100 J kg-1K-1. 175. 514 m3 h-1 (i) Use the &NTU method to find the exit temperature of the oil at the new flow rate. (ii) show, by calculation, how would the outlet oil temperature change if the oil mass flowrate would again increase by 28%, based on the value stated in the question (b).

(b) In a shell-and-tube heat exchanger, with one shell pass and four tube passes, water entering at 25°C and volume flowrate is being used to cool oil from 120°C. The mass flow rate of oil has recently been increased to 150 000 kg h-1. There is a total of 780 tubes of 5.0m length and 23.0mm outside diameter and 2 mm thickness. From the previous operation, the overall heat transfer coefficient of the exchanger is known to be 720 W m2K-1. Specific heat capacity of oil is 2100 J kg-1K-1. 175. 514 m3 h-1 (i) Use the &NTU method to find the exit temperature of the oil at the new flow rate. (ii) show, by calculation, how would the outlet oil temperature change if the oil mass flowrate would again increase by 28%, based on the value stated in the question (b).

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

(b) In a shell-and-tube heat exchanger, with one shell pass and four tube
passes, water entering at 25°C and volume flowrate
is being used to cool oil from 120°C. The mass flow rate of oil has
recently been increased to 150 000 kg h-1. There is a total of 780
tubes of 5.0m length and 23.0mm outside diameter and 2 mm
thickness. From the previous operation, the overall heat transfer
coefficient of the exchanger is known to be 720 W m-2K-1. Specific heat
capacity of oil is 2100 J kg-1K-1.
175. 514 m3 h-1
(i) Use the &NTU method to find the exit temperature of the oil at the
new flow rate. (ii) show, by calculation, how would the outlet oil
temperature change if the oil mass flowrate would again increase by
28%, based on the value stated in the question (b).

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