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1. i) How many tubes must be used? 2. ii) If the length of the heat exchanger is not to exceed 1.5 m, how many tube passes should be made?

1. i) How many tubes must be used? 2. ii) If the length of the heat exchanger is not to exceed 1.5 m, how many tube passes should be made?

Elements Of Electromagnetics
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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Heat Exc

A shell-and-tube heat exchanger (one shell pass, multiple tube passes) is to be used to cool engine oil of 100 kg/s entering the shell side at 370 K and leaving at 338 K. The corresponding convection coefficient on the tube surface and the LMTD correction factor of the heat exchanger are known to be h,=10867 W/m?K and F=0.99, respectively. The condenser will be supplied with cooling water that enters the tubes at 280 K and is to exit the tubes at 320K. Thin walled tubes of 30 mm diameter are specified and the mean velocity of water flow through the tubes is to be maintained at 1.42 m/s. Find: 1. i) How many tubes must be used? 2. ii) If the length of the heat exchanger is not to exceed 1.5 m, how many tube passes should be made? (for water =1000 kg/m³, c,=4000 J/kgK, µ=959x106 Ns/m², k=0.606 W/mK, Pr=6.62 and for engine oil c,=2000 J/kgK)
Transcribed Image Text:A shell-and-tube heat exchanger (one shell pass, multiple tube passes) is to be used to cool engine oil of 100 kg/s entering the shell side at 370 K and leaving at 338 K. The corresponding convection coefficient on the tube surface and the LMTD correction factor of the heat exchanger are known to be h,=10867 W/m?K and F=0.99, respectively. The condenser will be supplied with cooling water that enters the tubes at 280 K and is to exit the tubes at 320K. Thin walled tubes of 30 mm diameter are specified and the mean velocity of water flow through the tubes is to be maintained at 1.42 m/s. Find: 1. i) How many tubes must be used? 2. ii) If the length of the heat exchanger is not to exceed 1.5 m, how many tube passes should be made? (for water =1000 kg/m³, c,=4000 J/kgK, µ=959x106 Ns/m², k=0.606 W/mK, Pr=6.62 and for engine oil c,=2000 J/kgK)
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