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{
"metadata": {
"name": "",
"signature": "sha256:ce73d802673a1107e52bf47eb7b2328d569cd7caf2e704d6bf5c2e992f46aa53"
},
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5 - The first law and the dynamic open system"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 68"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the work done by the system and power\n",
"#Initialization of variables\n",
"rate= 5 #lbm/sec\n",
"Q=50 #Btu/s\n",
"h2=1020 #Btu/lbm\n",
"h1=1000 #Btu/lbm\n",
"V2=50 #ft/s\n",
"V1=100 #ft/s\n",
"J=778\n",
"g=32.2 #ft/s^2\n",
"gc=g\n",
"Z2=0\n",
"Z1=100. #ft\n",
"#calculations\n",
"dw=Q/rate -(h2-h1) -(V2**2- V1**2)/(2*gc*J) -g/gc *(Z2-Z1)/J\n",
"power=dw*rate\n",
"#results\n",
"print '%s %.1f %s' %(\"work done by the system =\",dw,\"Btu/lbm\")\n",
"print '%s %.1f %s' %(\"\\n Power =\",power,\"Btu/s\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"work done by the system = -9.7 Btu/lbm\n",
"\n",
" Power = -48.6 Btu/s\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 69"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the area of inlet pipe\n",
"#Initialization of variables\n",
"V=100 #ft/s\n",
"v=15. #lbm/ft^3\n",
"m=5. #lbm/s\n",
"#calculations\n",
"A=m*v/V\n",
"#results\n",
"print '%s %.2f %s' %(\"Area of inlet pipe =\",A,\"ft^2\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Area of inlet pipe = 0.75 ft^2\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 79"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the final temperature of the steam and change in temperature\n",
"#Initialization of variables\n",
"P=100. #psia\n",
"#calculations\n",
"print '%s' %(\"From table B-4\")\n",
"h=1187.2 #Btu/lbm\n",
"t1=328 #F\n",
"t2=540 #F\n",
"dt=t2-t1\n",
"#results\n",
"print '%s %d %s' %(\"Final temperature of the steam =\",t2,\"F\")\n",
"print '%s %d %s' %(\"\\n Change in temperature =\",dt,\"F\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table B-4\n",
"Final temperature of the steam = 540 F\n",
"\n",
" Change in temperature = 212 F\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
