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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 12 - The ideal gas and deviations of real gases"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 290"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the work done in the process\n",
"#Initialization of variables\n",
"import math\n",
"n=1.3\n",
"T1=460+60. #R\n",
"P1=14.7 #psia\n",
"P2=125. #psia\n",
"R=1545.\n",
"M=29.\n",
"#calculations\n",
"T2=T1*math.pow((P2/P1),((n-1)/n))\n",
"wrev=R/M *(T2-T1)/(1-n)\n",
"#results\n",
"print '%s %d %s' %(\"Work done =\",wrev,\"ft-lbf/lbm\")\n",
"print '%s' %(\"The answer is a bit different due to rounding off error in textbook\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Work done = -58988 ft-lbf/lbm\n",
"The answer is a bit different due to rounding off error in textbook\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 290"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the change in kinetic energy\n",
"#Initialization of variables\n",
"import math\n",
"P2=10. #psia\n",
"P1=100. #psia\n",
"T1=900. #R\n",
"w=50 #Btu/lbm\n",
"k=1.39\n",
"cp=0.2418\n",
"#calculations\n",
"T2=T1*math.pow((P2/P1),((k-1)/k))\n",
"T2=477\n",
"KE=-w-cp*(T2-T1)\n",
"#results\n",
"print '%s %.1f %s' %(\"Change in kinetic energy =\",KE,\" Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Change in kinetic energy = 52.3 Btu/lbm\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 301"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the final temperature of the system\n",
"#Initialization of variables\n",
"T1=900. #R\n",
"P1=100. #psia\n",
"P2=10. #psia\n",
"#calculations\n",
"print '%s' %(\"From table B-9\")\n",
"pr1=8.411\n",
"pr2=pr1*P2/P1\n",
"T2=468. #R\n",
"#results\n",
"print '%s %d %s' %(\"Final temperature =\",T2,\"R \")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table B-9\n",
"Final temperature = 468 R \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4 - Pg 302"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calcuate the final temperature, pressure, enthalpy and the work done in the process\n",
"#Initialization of variables\n",
"cr=6\n",
"p1=14.7 #psia\n",
"t1=60.3 #F\n",
"M=29.\n",
"R=1.986\n",
"#calculations\n",
"print '%s' %(\"from table b-9\")\n",
"vr1=158.58 \n",
"u1=88.62 #Btu/lbm\n",
"pr1=1.2147\n",
"vr2=vr1/cr\n",
"T2=1050. #R\n",
"u2=181.47 #Btu/lbm\n",
"pr2=14.686\n",
"p2=p1*(pr2/pr1)\n",
"dw=u1-u2\n",
"h2=u2+T2*R/M\n",
"#results\n",
"print '%s %d %s' %(\"final temperature =\",T2,\" R\")\n",
"print '%s %.1f %s' %(\"\\n final pressure =\",p2,\"psia\")\n",
"print '%s %.2f %s' %(\"\\n work done =\",dw,\"Btu/lbm\")\n",
"print '%s %.1f %s' %(\"\\n final enthalpy =\",h2,\" Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"from table b-9\n",
"final temperature = 1050 R\n",
"\n",
" final pressure = 177.7 psia\n",
"\n",
" work done = -92.85 Btu/lbm\n",
"\n",
" final enthalpy = 253.4 Btu/lbm\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
