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"name": "",
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter10-Availbility,exergy and irreversibilitiy"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example1-pg 180"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#calculate work of the water and heat interaction of the water and aximum work done\n",
"##initialisation of variables\n",
"m= 2 ##kg\n",
"p= 200 ##kPa\n",
"v2= 0.9596 ##m^3/kg\n",
"v1= 0.001 ##m^3/kg\n",
"u2= 2768.8 ##kJ/kg\n",
"u1= 83.96 ##kJ/kg\n",
"T= 20 ##C\n",
"u3= 2576.9 ##kJ/kg\n",
"s2= 7.2795 ##kJ/kg K\n",
"s1= 0.2966 ##kJ/kg K\n",
"Tr= 150 ##C\n",
"##CALCULATIONS\n",
"W= m*p*(v2-v1)\n",
"Q= m*(u2-u1)\n",
"A= m*((u3-u1)-(273.15+T)*(s2-s1))\n",
"Ar= -Q*(1-((273.15+T)/(273.15+Tr)))\n",
"Wrep= -(A+Ar)\n",
"##RESULTS\n",
"print'%s %.1f %s'%('work of the water =',W,'kJ')\n",
"print'%s %.1f %s'% ('Heat interaction of the water =',Q,'kJ')\n",
"print'%s %.1f %s'%('maximum work done =',Wrep,'kJ')\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"work of the water = 383.4 kJ\n",
"Heat interaction of the water = 5369.7 kJ\n",
"maximum work done = 757.9 kJ\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example2-pg 182"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#calculate irreversibility of the processes\n",
"##initialisation of variables\n",
"Wrev= 757.8 ##kJ\n",
"W= 383.4 ##kJ\n",
"m= 2 ##kg\n",
"s2= 7.2795 ##kJ/kg K\n",
"s1= 0.2966 ##kJ/kg K\n",
"Qr= 5369.7 ##kJ\n",
"T= 150 ##C\n",
"T0= 20 ##C\n",
"##CALCULATIONS\n",
"I= Wrev-W\n",
"dS= m*(s2-s1)\n",
"Sr= -Qr/(273.15+T)\n",
"I1= (273.15+T0)*(dS+Sr)\n",
"##RESULTS\n",
"print'%s %.1f %s'%('Irreversibility of the process=',I1,'kJ')\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Irreversibility of the process= 374.1 kJ\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example7-pg192"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate mass flow rates and wmax and irreversibility\n",
"import math\n",
"##initialisation of variables\n",
"h3= 2793.2 ##kJ/kg\n",
"h2= 1342.3 ##kJ/kg\n",
"h1= 2993.5 ##kJ/kg\n",
"m3= 2.5 ##kg/s\n",
"b1= 1043.9 ##kJ/kg\n",
"b2= 374.24 ##kJ/kg\n",
"b3= 875.41 ##kJ/kg\n",
"##CALCULATIONS\n",
"m1= m3*((h3-h2)/(h1-h2))\n",
"m2= m3*((h3-h1)/(h2-h1))\n",
"Bin= (m1*b1+m2*b2)\n",
"Bout= m3*b3\n",
"B= Bin-Bout\n",
"Wmax= B\n",
"I= B\n",
"##RESULTS\n",
"print'%s %.3f %s'%('mass flow rate=',m1,'kg/s')\n",
"print'%s %.3f %s'%('mass flow rate=',m2,'kg/s')\n",
"print'%s %.3f %s'%('Wmax=',Wmax,'kg/s')\n",
"print'%s %.1f %s'%('Irreversibility=',Wmax,'kW')\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"mass flow rate= 2.197 kg/s\n",
"mass flow rate= 0.303 kg/s\n",
"Wmax= 218.141 kg/s\n",
"Irreversibility= 218.1 kW\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}
|
