To, out To, in = 100°℃ OiL m₂ = 0.2kg/s Water > mw=0-15kg L Tw, out Twin- 30°℃ (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water. (b) How long must the tube be made if the outlet temperature of the oil is 60°C? (c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat exchangers? (d)If the heat exchanger is changed to a parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?

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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To, out
Jo, in = 100°c
OiL
m = 0.2kg/s
Water>
mw=0-15kg,
5
Tw, out
Twin-
30°C
(a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet
temperature of the water.
(b) How long must the tube be made if the outlet temperature of the oil is 60°C?
(c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat
exchangers?
(d)If the heat exchanger is changed to a parallel flow heat exchanger, how long must the tube be made
if the outlet temperature of the oil is 60°C?
L
Transcribed Image Text:To, out Jo, in = 100°c OiL m = 0.2kg/s Water> mw=0-15kg, 5 Tw, out Twin- 30°C (a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water. (b) How long must the tube be made if the outlet temperature of the oil is 60°C? (c) Explain and discuss with the use of diagrams the difference between parallel and counter flow heat exchangers? (d)If the heat exchanger is changed to a parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C? L
Task 2
A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube of 30
mm diameter carrying water and an outer tube of 50 mm diameter carrying the oil. The exchanger
operates in counterflow mode with an overall heat transfer coefficient of 65 W/m² K and the tabulated
average properties are given.
Properties
Water
Oil
p (kg/m³)
1000
4200
Cp (J/kg-K)
v (m²/s)
7 x 10-7
k (W/m .K)
0.64
4.7
Pr
800
1900
1 × 10-5
0.134
140
Transcribed Image Text:Task 2 A heat exchanger that is used for cooling lubricating oil is comprised of a thin-walled inner tube of 30 mm diameter carrying water and an outer tube of 50 mm diameter carrying the oil. The exchanger operates in counterflow mode with an overall heat transfer coefficient of 65 W/m² K and the tabulated average properties are given. Properties Water Oil p (kg/m³) 1000 4200 Cp (J/kg-K) v (m²/s) 7 x 10-7 k (W/m .K) 0.64 4.7 Pr 800 1900 1 × 10-5 0.134 140
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