1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
{
"metadata": {
"name": "EHP-7"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Steam Turbines"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.1,Page 390"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nP1=200.0 #psia\nT1=500.0 #psia\nm=1.0 #lb /s\nP4=140.0 #psia\nP11=1.0 #psia\nx=0.808\n\n#calculations\n#\"From mollier charts\"\nh1=1268.9 #Btu/lb\nh4=1234.7 #Btu/lb\nV4=223.8*sqrt(h1-h4)\nv4=3.584 #cu ft/lb\nA4=m*v4/V4\nh11=907.4 #Btu/lb\nV11=223.8*sqrt(h1-h11)\nvf=0.01614 #cu ft/lb\nvg=333.6 #cu ft/lb\nvfg=vg-vf\nv11=x*vg\nA11=m*v11/V11 #area\n\n#results\nprint \"Area of nozzle in sq ft\",round(A4,6)\nprint \" Area of nozzle in sq ft\",round(A11,6)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Area of nozzle in sq ft 0.002738\n Area of nozzle in sq ft 0.063347\n"
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.4,Page 410"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan, cos\nfrom numpy import *\nP1=200.0 #psia\nT1=500.0 #F\nP2=1.0 #psia\nalpha=20.0 #degrees\nn=3600.0\ng=32.2 #ft/s^2\n\n#calculations\n#\"From mollier charts\"\nV1=4240.0 #fps\nVb=V1*cos(alpha*pi/180) /2\nR=Vb*60/(n*2*pi)\nwork=1/32.2 *(V1*cos(alpha*pi/180))*Vb\neff=work/(V1**2 /(2*g)) *100 #efficiency\n\n#results\nprint \"Blade velocity in fps\",round(Vb,3)\nprint \" Blade radius in ft\",round(R,3)\nprint \" Work done in per lb of steam\",round(work,3)\nprint \" Blade efficiency in percent\",round(eff,3)\nprint \"The answers are a bit different due to rounding off error in textbook\"\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Blade velocity in fps 1992.148\n Blade radius in ft 5.284\n Work done in per lb of steam 246500.315\n Blade efficiency in percent 88.302\nThe answers are a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 19
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.5,Page 411"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nP1=200.0 #psia\nT1=500.0 #F\nP2=1.0 #psia\nalpha=20.0 #degrees\nn=3600.0\ng=32.2 #ft/s^2\nVb=1200.0 #fps\n\n#calculations\n#\"From mollier charts\"\nV1=4240.0 #fps\nV1x=3980.0 #fps\nV2x=-1580.0 #fps\nwork=1/32.2 *(V1x - V2x)*Vb\neff=work/(V1**2 /(2*g)) *100 #efficiency\n\n#results\nprint \" Work done in per lb of steam\",round(work,3)\nprint \" Blade efficiency in percent\",round(eff,3)\nprint \"The answers are a bit different due to rounding off error in textbook\"\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": " Work done in per lb of steam 207204.969\n Blade efficiency in percent 74.226\nThe answers are a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.6,Page 413"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan, cos, tan\nfrom numpy import *\nP1=200.0 #psia\nT1=500.0 #F\nP2=1.0 #psia\nalpha=20.0 #degrees\nn=3600.0\ng=32.2 #ft/s^2\n\n#calculations\n#\"From mollier charts\")\nV1=2450 #fps\nVb=V1*cos(alpha*pi/180) /2\nR=Vb*60/(n*2*pi)\nwork=1/32.2 *(V1*cos(alpha*pi/180))*Vb\nw3=3*work #workdone\n\n#results\nprint \"Blade velocity in fps\",round(Vb,3)\nprint \"Blade radius in ft\",round(R,3)\nprint \" Work done in per lb of steam\",round(w3,3)\nprint \"The answers are a bit different due to rounding off error in textbook\"\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Blade velocity in fps 1151.123\nBlade radius in ft 3.053\n Work done in per lb of steam 246910.29\nThe answers are a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.7, Page 416"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nP1=200.0 #psia\nT1=500.0 #F\nP2=1.0 #psia\nalpha=20.0 #degrees\nn=3600.0\ng=32.2 #ft/s^2\nstage=2.0\n\n#calculations\n#\"From mollier charts\"\nV1=4240.0 #fps\nVb=V1*cos(alpha*pi/180) /(2*stage)\nR=Vb*60/(n*2*pi)\nV1x=3980 #fps\nV2x=-1990 #fps\nwork1=1/g *(V1x-V2x)*Vb #work\nwork2=1/g *(-V2x)*Vb #work\nwt=work1+work2 #work done\n\n#results\nprint \"Blade velocity in fps\",round(Vb,3)\nprint \" Blade radius in ft\",round(R,3)\nprint \" Work done in per lb of steam\",round(wt,3)\nprint \"The answers are a bit different due to rounding off error in textbook\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Blade velocity in fps 996.074\n Blade radius in ft 2.642\n Work done in per lb of steam 246234.486\nThe answers are a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.8,Page 422"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan,cos, tan\nfrom numpy import *\nalpha=20.0 #degrees\nn=3600.0\ng=32.2 #ft/s^2\nV1=500 #fps\n\n#calculations\nVb=V1*cos(alpha*pi/180) #blade velocity\nV1x=Vb\nwork=1/32.2 *(V1x)*Vb #work done\n\n#results\nprint \"Blade velocity in fps\",round(Vb,3)\nprint \" Work done in per lb of steam\",round(work,3)\nprint \"The answers are a bit different due to rounding off error in textbook.\"\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Blade velocity in fps 469.846\n Work done in per lb of steam 6855.763\nThe answers are a bit different due to rounding off error in textbook.\n"
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.9,Page 436"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\npower=1000.0 #kw\nms=16000.0 #lb/hr\nP=200.0 #psia\nT=540 #F\n\n#calculations\n#\"From mollier charts\"\nh1=1290.0 #Btu/hr\nh2=940.0 #Btu/hr\ndh=h1-h2\nrate=3413.0/dh\nact=ms/power #steam rate\n\n#results\nprint \"Ideal steam rate in per kw hr\",round(rate,3)\nprint \" Actual steam rate in per kw hr\",round(act,3)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Ideal steam rate in per kw hr 9.751\n Actual steam rate in per kw hr 16.0\n"
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 7.10,Page 439"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nP=200 #psia\nT=540 #F\npower=1000 #kw\nms=16000 #lb/hr\n\n#calculations\n#\"From mollier charts\")\nh1=1290.0 #Btu/hr\nh2=940.0 #Btu/hr\ndh=h1-h2\nhf2=83.0 #Btu/lb\netat=(h1-h2)/(h1-hf2)\nact=power*3413/(ms*(h1-hf2)) #thermal efficiency\netae=act/etat #efficiency of engine\n\n#results\nprint \"Ideal thermal efficiency in percent\",round(etat*100,3)\nprint \"Actual thermal efficiency in percent\",round(act*100,3)\nprint \" Engine efficiency in percent\",round( etae*100,3)\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Ideal thermal efficiency in percent 28.998\nActual thermal efficiency in percent 17.673\n Engine efficiency in percent 60.946\n"
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
