Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Textbook Question
Chapter 10, Problem 10.6P
Mot water is used to heat air in a double-pipe heat exchanger as shown in the following sketch. If the
heat transfer coefficients on the water side and on the air side are
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EXAMPLE 3
Consider the heat exchanger
finned-tube, cross-flow heat exchanger with a gas-side overall
heat transfer coefficient and area of 100 W/m² · K and 40 m²,
respectively. The water flow rate and inlet temperature remain at
1 kg/s and 35C. However, a change in operating conditions for
the hot gas generator causes the gases to now enter the heat
exchanger with a flow rate of 1.5 kg/s and a temperature of
250C. What is the rate of heat transfer by the exchanger, and
what are the gas and water outlet temperatures?
that is, a
1² .
Blowtorch is used to connect the two pipes together. Length of the pipe
section shown is 150 cm with an inner diameter of 85 cm. The thickness of
the pipe wall is 4 mm. The conductivity of the pipe section is 167 W/m^2K.
Environment has a temperature of 30 C and convective heat transfer
coefficient of 28 WI(mC), find the required heat transfer to join the pipe
sections at 220 C? HINT: Assume that the welding section is the base
plate and the pipe is 1D extended surface (fin) symmetric about the torch
melting line. Heat transfer happens by conduction along the pipe
thickness in horizontal direction and by convection to the environment.
Length
thickness
Torch melting line
Blowtorch is used to connect the two pipes together. Length of the pipe
section shown is 150 cm with an inner diameter of 85 cm. The thickness of
the pipe wall is 4 mm. The conductivity of the pipe section is 167 Wim^2K.
Environment has a temperature of 30 C and convective heat transfer
coefficient of 28 WI(mC), find the required heat transfer to join the pipe
sections at 220 C? HINT: Assume that the welding section is the base
plate and the pipe is 1D extended surface (fin) symmetric about the torch
melting line. Heat transfer happens by conduction along the pipe
thíckness in horizontal direction and by convection to the environment.
Length
thickness
Torch melting line
200 W
275 W
none
314 W
453 W
Chapter 10 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 10 -
10.1 In a heat exchanger, as shown in the...Ch. 10 - Prob. 10.2PCh. 10 -
10.3 A light oil flows through a copper tube of...Ch. 10 - Prob. 10.4PCh. 10 - Water flowing in a long, aluminum lube is to be...Ch. 10 - Mot water is used to heat air in a double-pipe...Ch. 10 - Prob. 10.7PCh. 10 -
10.8 The heat transfer coefficient of a copper...
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