Introduction to Heat Transfer
6th Edition
ISBN: 9780470501962
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 3, Problem 3.85P
(a)
To determine
Maximum temperature for the case 1.
(b)
To determine
To plot:The temperature distribution.
(c)
To determine
To plot:The temperature distribution for case 2.
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Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 500 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 12 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible).
a. Heat loss per hour. = Answer kJ / hour.
b. Temperature between insulation layers. = Answer ° C.
Steel pipe (outer diameter 100 mm) is covered with two layers of insulation. The inner layer, 40 mm thick, has a thermal conductivity of 0.07 W / (m K). The outer layer, 20 mm thick, has a thermal conductivity of 0.15 W / (m K). Pipes are used to deliver steam with a pressure of 600 kPa. The temperature on the outer insulation surface is 24 ° C. If the pipe is 8 m long, determine the following: (assuming that the conduction heat transfer resistance of the steel pipe and the vapor convection resistance are negligible).
a. Heat loss per hour. = kJ / hour.
b. Temperature between insulation layers. = ° C
Stainless steel pipes with a thermal conductivity of 17 W/ (m° C) are used to transport hot
oil. The temperature inside the tube is 130 ° C. The inner diameter of the pipe is 8 cm and
the thickness of the pipe wall is 2 cm. The pipe is then insulated with 4 cm thick insulation
with a thermal conductivity of 0.035 W / (m° C). The ambient temperature of the pipe is 25
° C. Calculate the temperature between the steel and the insulation if we assume a steady
state. A picture of the pipe can be seen below.
Chapter 3 Solutions
Introduction to Heat Transfer
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