Low Pressure Heater From page 67 Table 5 of Power Generation Calculations Reference Guides Corresponding Correction Factor Thickness 1.65 யய Since BWG 18 is used D₁ = D₁ - 2t = 25.42 (1.65) = 22.1 mm Ainside = = 383.597215 mm² = 0.000383597215 m² V₁ = AV n n = Use 1 Arsenic-Copper Tubers W₁-X-X-X7 to at P Pa 13 XT BWG Product in = 25.4 mm 1 18 1 1 n = 0.074154926 (0.000383597215) (24) = Atube V 80.54773281 = 81 tubes Tube Length For BWG 18 0.079796 Standard Surface Area per Unit Length for 1 inch tube Table from First Checking at Point 7' At 2.5 MPa AJ U = 4.3 (1) 4.3 9.86205809 L₁ = 1.525410529 m 81 (0.079817073) H 3350.8 450 459.595 C 3372.1976 3373.1 460 Surface Area Required Actual Number of Tube and Length of Tubes ליד QLPH = x (½ - hs) QLPH = 4.94564 ( 3372.19 - 2nd Checking x 1229.915) = Use pass 10594.95864 kJ/s Actual Number of Tubes Logarithmic Mean Temperature Difference Q A = From interpolation at point 7' of Piping Design U LMTD Actual Length of Tube Outside Diameter of the Shell 81 2) = 1.525 162 Tubes + 2 = 0.762705265 m с 125 mm 10594.9586 459.5963 C emin Counter Flow 223.99 C A = = 9.862058088 m² (4.3) (249.8407) P (pitch) do = 125 + 25.4 = 150.4 mm at P7' 2.5 MPa P 101.87 C 57.8°C Number of Tubes max-min LMTD = t maximum = 223.99 - 57.8 = 166.19 Fave= to +10 average temperature 2 Bmin 57.8 + 101.87 Fave= 79.833 °C T minimum = 459.59 -101.87 = 357.73 2 16619-357.73 LMTD = In -191.54 -0.7666467998 From Table 1 of the Steam Table = 249.840738 °C 357.73 V = 0.001029 Overall Heat Transfer Coefficient 79 79.83333333 80 0.0010285 V 0.0010291 Fave= Fave= to +10 ༦ – 57.8 average temperature 101.87 2 = 79.833 °C Assume a feedwater velocity of 2.4 m/s U = Given as: 4.3 m²-C Conver the water entering the tube into volume V₁ = (W₂ + W)V = 70.652 (1.41304) = 0.07415 m³ 5.921259843 in The number of tubes per square feet of tube sheet 28.03457447 The number of tubes per square feet of tube sheet Since there are 162 tubes: Arube sheet = = 166 P tubes 28.03457447 = 5.778578882 ft² = 832.1153591 in² Atube sheet Dshell = 1058.940391 = 32.549 in 0.7854 Dshell 0.826762072 m = 82.6762072 cm W X3 X6 X 7 110 7 17 10 13 × 7 t'13 W X3 X X 7 t, at P=P8
Low Pressure Heater From page 67 Table 5 of Power Generation Calculations Reference Guides Corresponding Correction Factor Thickness 1.65 யய Since BWG 18 is used D₁ = D₁ - 2t = 25.42 (1.65) = 22.1 mm Ainside = = 383.597215 mm² = 0.000383597215 m² V₁ = AV n n = Use 1 Arsenic-Copper Tubers W₁-X-X-X7 to at P Pa 13 XT BWG Product in = 25.4 mm 1 18 1 1 n = 0.074154926 (0.000383597215) (24) = Atube V 80.54773281 = 81 tubes Tube Length For BWG 18 0.079796 Standard Surface Area per Unit Length for 1 inch tube Table from First Checking at Point 7' At 2.5 MPa AJ U = 4.3 (1) 4.3 9.86205809 L₁ = 1.525410529 m 81 (0.079817073) H 3350.8 450 459.595 C 3372.1976 3373.1 460 Surface Area Required Actual Number of Tube and Length of Tubes ליד QLPH = x (½ - hs) QLPH = 4.94564 ( 3372.19 - 2nd Checking x 1229.915) = Use pass 10594.95864 kJ/s Actual Number of Tubes Logarithmic Mean Temperature Difference Q A = From interpolation at point 7' of Piping Design U LMTD Actual Length of Tube Outside Diameter of the Shell 81 2) = 1.525 162 Tubes + 2 = 0.762705265 m с 125 mm 10594.9586 459.5963 C emin Counter Flow 223.99 C A = = 9.862058088 m² (4.3) (249.8407) P (pitch) do = 125 + 25.4 = 150.4 mm at P7' 2.5 MPa P 101.87 C 57.8°C Number of Tubes max-min LMTD = t maximum = 223.99 - 57.8 = 166.19 Fave= to +10 average temperature 2 Bmin 57.8 + 101.87 Fave= 79.833 °C T minimum = 459.59 -101.87 = 357.73 2 16619-357.73 LMTD = In -191.54 -0.7666467998 From Table 1 of the Steam Table = 249.840738 °C 357.73 V = 0.001029 Overall Heat Transfer Coefficient 79 79.83333333 80 0.0010285 V 0.0010291 Fave= Fave= to +10 ༦ – 57.8 average temperature 101.87 2 = 79.833 °C Assume a feedwater velocity of 2.4 m/s U = Given as: 4.3 m²-C Conver the water entering the tube into volume V₁ = (W₂ + W)V = 70.652 (1.41304) = 0.07415 m³ 5.921259843 in The number of tubes per square feet of tube sheet 28.03457447 The number of tubes per square feet of tube sheet Since there are 162 tubes: Arube sheet = = 166 P tubes 28.03457447 = 5.778578882 ft² = 832.1153591 in² Atube sheet Dshell = 1058.940391 = 32.549 in 0.7854 Dshell 0.826762072 m = 82.6762072 cm W X3 X6 X 7 110 7 17 10 13 × 7 t'13 W X3 X X 7 t, at P=P8
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
Related questions
Question
what is an low pressure Heater, what are formulas, and their importance, define the diagram, and give me a script on how to explain the design of an air preheater, and how did values end up in that number. based on standards
Transcribed Image Text:Low Pressure Heater
From page 67 Table 5 of Power Generation Calculations Reference Guides
Corresponding Correction Factor
Thickness
1.65
யய
Since BWG 18 is used
D₁ = D₁ - 2t = 25.42 (1.65) = 22.1 mm
Ainside =
= 383.597215 mm² = 0.000383597215 m²
V₁ = AV n
n =
Use 1
Arsenic-Copper Tubers
W₁-X-X-X7
to at P Pa
13 XT
BWG
Product
in
=
25.4 mm
1
18
1
1
n =
0.074154926
(0.000383597215) (24)
=
Atube V
80.54773281
=
81 tubes
Tube Length
For BWG
18
0.079796
Standard Surface Area per Unit Length
for 1 inch tube
Table from First Checking at Point 7'
At
2.5
MPa
AJ
U =
4.3
(1)
4.3
9.86205809
L₁ =
1.525410529 m
81 (0.079817073)
H
3350.8
450
459.595 C
3372.1976
3373.1
460
Surface Area Required
Actual Number of Tube and Length of Tubes
ליד
QLPH = x (½ - hs)
QLPH = 4.94564 ( 3372.19 -
2nd Checking x
1229.915) =
Use
pass
10594.95864 kJ/s
Actual Number of Tubes
Logarithmic Mean Temperature Difference
Q
A =
From interpolation at point 7' of Piping Design
U
LMTD
Actual Length of Tube
Outside Diameter of the Shell
81 2) =
1.525
162 Tubes
+ 2 =
0.762705265 m
с
125 mm
10594.9586
459.5963 C
emin
Counter Flow
223.99 C
A =
=
9.862058088 m²
(4.3) (249.8407)
P (pitch)
do =
125
+
25.4 =
150.4 mm
at P7'
2.5 MPa
P
101.87 C
57.8°C
Number of Tubes
max-min
LMTD =
t
maximum
=
223.99 - 57.8
=
166.19
Fave=
to +10
average temperature
2
Bmin
57.8 +
101.87
Fave=
79.833 °C
T
minimum =
459.59 -101.87 =
357.73
2
16619-357.73
LMTD =
In
-191.54
-0.7666467998
From Table 1 of the Steam Table
= 249.840738 °C
357.73
V = 0.001029
Overall Heat Transfer Coefficient
79
79.83333333
80
0.0010285
V
0.0010291
Fave=
Fave=
to +10
༦ –
57.8
average temperature
101.87
2
=
79.833 °C
Assume a feedwater velocity of 2.4 m/s
U = Given as: 4.3 m²-C
Conver the water entering the tube into volume
V₁ = (W₂ + W)V
=
70.652 (1.41304) =
0.07415 m³
5.921259843 in
The number of tubes per square feet of tube sheet
28.03457447
The number of tubes per square feet of tube sheet
Since there are 162 tubes:
Arube sheet
=
=
166
P
tubes
28.03457447
= 5.778578882 ft²
=
832.1153591 in²
Atube sheet
Dshell
=
1058.940391
=
32.549
in
0.7854
Dshell 0.826762072 m
= 82.6762072 cm
Transcribed Image Text:W X3 X6 X 7
110
7
17
10
13 × 7
t'13
W X3 X X 7
t, at P=P8
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