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 p (kg/m³) (J/kg-K) (m²/s) k (W/m .K) Pr Page 6 of 8 Water 1000 4200 7 x 10-7 Water> 0.15 kg, 0.64 4.7 To, out Oil 800 1900 1x 10-³ 0.134 140 To, in = 100°c KOIL m = 0.2kg/s
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 p (kg/m³) (J/kg-K) (m²/s) k (W/m .K) Pr Page 6 of 8 Water 1000 4200 7 x 10-7 Water> 0.15 kg, 0.64 4.7 To, out Oil 800 1900 1x 10-³ 0.134 140 To, in = 100°c KOIL m = 0.2kg/s
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.46P
Related questions
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
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
P (kg/m²)
(J/kg-K)
▸ (m²/s)
k (W/m K)
Pr
Page 6 of 8
Water
1000
4200
7 x 107
0.64
4.7
Oil
800
1900
1 x 10-5
0.134
140
Join = 100°c
OiL
m = 0.2kg/s
To, out
tr
Water>
mw=0-15kg,
S
Twin =
L
Tw, out
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?
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 4 steps with 3 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi…
Mechanical Engineering
ISBN:
9781305387102
Author:
Kreith, Frank; Manglik, Raj M.
Publisher:
Cengage Learning
Principles of Heat Transfer (Activate Learning wi…
Mechanical Engineering
ISBN:
9781305387102
Author:
Kreith, Frank; Manglik, Raj M.
Publisher:
Cengage Learning