Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe (thermal conductivity k =43 W/m °C). The temperature of the air outside the steel pipe is 25 °C. The convection coefficient between water and pipe (h;) is 500 W/m? °C The convection coefficient between the pipe and outside air (ho) is 12 W/m2 °C. (a) Draw the equivalent electric circuit of the thermal resistance. (b) Calculate the heat transfer rate from the water to air. (c) Calculate the overall heat-transfer coefficient, U,. -- - 2
Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe (thermal conductivity k =43 W/m °C). The temperature of the air outside the steel pipe is 25 °C. The convection coefficient between water and pipe (h;) is 500 W/m? °C The convection coefficient between the pipe and outside air (ho) is 12 W/m2 °C. (a) Draw the equivalent electric circuit of the thermal resistance. (b) Calculate the heat transfer rate from the water to air. (c) Calculate the overall heat-transfer coefficient, U,. -- - 2
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Answer A.S.A.P the class is Heat Transfer, please show all steps. Thank you.
![Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe
(thermal conductivity k =43 W/m °C). The temperature of the air outside the steel
pipe is 25 °C. The convection coefficient between water and pipe (hì) is 500 W/m2 °C.
The convection coefficient between the pipe and outside air (ho) is 12 W/m2 °C.
(a) Draw the equivalent electric circuit of the thermal resistance.
(b) Calculate the heat transfer rate from the water to air.
(c) Calculate the overall heat-transfer coefficient, U.
(d) The pipe is covered with a layer of asbestos [k =0.18 W/m °C] while still
surrounded by a convection environment with h = 12W/m2 °C. Calculate the critical
%3|
insulation radius to determine if the heat transfer rate will increase or decrease when
the insulator layer is 0.05 mm thick.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F36997276-e876-4d20-b813-249583ed4792%2F31cb8ad0-02be-41fe-af0c-d0b8d8783bfa%2Fzl9a1qj_processed.png&w=3840&q=75)
Transcribed Image Text:Water at 150 °C flows on the inside of a 1 meter long 2" Schedule 80 steel pipe
(thermal conductivity k =43 W/m °C). The temperature of the air outside the steel
pipe is 25 °C. The convection coefficient between water and pipe (hì) is 500 W/m2 °C.
The convection coefficient between the pipe and outside air (ho) is 12 W/m2 °C.
(a) Draw the equivalent electric circuit of the thermal resistance.
(b) Calculate the heat transfer rate from the water to air.
(c) Calculate the overall heat-transfer coefficient, U.
(d) The pipe is covered with a layer of asbestos [k =0.18 W/m °C] while still
surrounded by a convection environment with h = 12W/m2 °C. Calculate the critical
%3|
insulation radius to determine if the heat transfer rate will increase or decrease when
the insulator layer is 0.05 mm thick.
Transcribed Image Text:Table A-11 | Steel-pipe dimensions.
Nominal
Metal
Inside cross-
pipe
Wall
sectional
sectional
size, in
OD, in
Schedule no.
Thickness, in
ID, in
in?
area, ft²
area,
1
8
0.405
40
0.068
0.269
0.072
0.00040
80
0.095
0.215
0.093
0.00025
0.540
40
0.088
0.364
0.125
0.00072
80
0.119
0.302
0.157
0.00050
0.675
40
0.091
0.493
0.167
0.00133
80
0.126
0.423
0.217
0.00098
1
0.840
40
0.109
0.622
0.250
0.00211
80
0.147
0.546
0.320
0.00163
1.050
40
0.113
0.824
0.333
0.00371
80
0.154
0.742
0.433
0.00300
1
1.315
40
0.133
1.049
0.494
0.00600
80
0.179
0.957
0.639
0.00499
1.900
40
0.145
1.610
0.799
0.01414
80
0.200
1.500
1.068
0.01225
160
0.281
1.338
1.429
0.00976
2
2.375
40
0.154
2.067
1.075
0.02330
80
0.218
1.939
1.477
0.02050
3
3.500
40
0.216
3.068
2.228
0.05130
80
0.300
2.900
3.016
0.04587
4
4.500
40
0.237
4.026
3.173
0.08840
80
0.337
3.826
4.407
0.7986
5.563
40
0.258
5.047
4.304
0.1390
80
0.375
4.813
6.122
0.1263
120
0.500
4.563
7.953
0.1136
160
0.625
4.313
9.696
0.1015
6.625
40
0.280
6.065
5.584
0.2006
80
0.432
5.761
8.405
0.1810
10
10.75
40
0.365
10.020
11.90
0.5475
80
0.500
9.750
16.10
0.5185
314
6.
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