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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter8-Entropy"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example1 pg- 168"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate and entropy of ice and environment and universe\n",
      "##initialisation of variables\n",
      "m= 2 ##kg\n",
      "dh= 333.39 ##kg/h\n",
      "T= 0 ##C\n",
      "T1= 20 ##C\n",
      "##CALCULATIONS\n",
      "Q12= m*dh\n",
      "dS= Q12/(273.15+T)\n",
      "dSenvir= -Q12/(273.15+T1)\n",
      "dStotal= dS+dSenvir\n",
      "##RESULTS\n",
      "print'%s %.3f %s'%(' entropy of ice =',dS,'kJ/K')\n",
      "print'%s %.3f %s'%('entropy of environment =',dSenvir,'kJ/K')\n",
      "print'%s %.3f %s'%('entropy of universe =',dStotal,'kJ/K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " entropy of ice = 2.441 kJ/K\n",
        "entropy of environment = -2.275 kJ/K\n",
        "entropy of universe = 0.167 kJ/K\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example2-pg169"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#calculate change in entropy in system and environment and entropy\n",
      "##initialisation of variables\n",
      "Q= 666.78 ##kJ\n",
      "T= 0 ##C\n",
      "Th= 20. ##C\n",
      "##CALCULATIONS\n",
      "Ssys= Q/(273.15+T)\n",
      "Qh= Q*((273.15+Th)/(273.15+T))\n",
      "Senvir= -Qh/(273.15+Th)\n",
      "Stotal= Ssys+Senvir\n",
      "##RESULTS\n",
      "print'%s %.4f %s'%('change in entropy in sysytem =',Ssys,' kJ/K')\n",
      "print'%s %.4f %s'%('change in entropy in environment =',Senvir,'kJ/K')\n",
      "print'%s %.f %s'%('total change in entropy =',Stotal,'kJ/K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "change in entropy in sysytem = 2.4411  kJ/K\n",
        "change in entropy in environment = -2.4411 kJ/K\n",
        "total change in entropy = 0 kJ/K\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example3-pg171\n"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate change in entropy\n",
      "##initialisation of variables\n",
      "S1= 6.2872 ##J/kg K\n",
      "S2= 5.8712 ##J/kg K\n",
      "m= 18 ##kg\n",
      "##CALCULATIONS\n",
      "S= m*(S1-S2)\n",
      "##RESULTS\n",
      "print'%s %.3f %s'%(' change in entropy =',S,'kJ/K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " change in entropy = 7.488 kJ/K\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example4-pg 171"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate change in entropy\n",
      "##initialisation of variables\n",
      "S2= 5.8328 ##kJ/kg\n",
      "S1= 5.8712 ##kJ/kg\n",
      "##CALCULATIONS\n",
      "S= S2-S1\n",
      "##RESULTS\n",
      "print'%s %.5f %s'%('change in entropy = ',S,'kJ/K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "change in entropy =  -0.03840 kJ/K\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example5-pg172"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#calculate enthalpy and change in entropy\n",
      "##initialisation of variables\n",
      "m= 0.1 ##kg\n",
      "p= 3 ##bar\n",
      "p1= 10 ##bar\n",
      "h1= 2964.3 ##kJ/kg\n",
      "v1=0.2378\n",
      "s2= 7.1619 ##kJ/k\n",
      "s1= 6.9641 ##kJ/k\n",
      "##CALCULATIONS\n",
      "h2= h1+(p-p1)*math.pow(10,5)*v1*math.pow(10,-3)\n",
      "S= m*(s2-s1)\n",
      "##RESULTS\n",
      "print'%s %.1f %s'%(' enthalpy =',h2,'kJ/kg')\n",
      "print'%s %.5f %s'%('change in entropy =',S,'kJ/K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " enthalpy = 2797.8 kJ/kg\n",
        "change in entropy = 0.01978 kJ/K\n"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example6-pg 174"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate final pressure and change in entropy\n",
      "import math\n",
      "##initialisation of variables\n",
      "p1= 5. ##bar\n",
      "V1= 0.4 ##m^2\n",
      "V2= 1.2 ##m^3\n",
      "R= 8.314 ##J/mol K\n",
      "M= 28.##gms\n",
      "T1= 80.##C\n",
      "##CALCULATIONS\n",
      "p2= p1*(V1/V2)\n",
      "S= R*math.log(V2/V1)/M\n",
      "S1= S*p1*V1*100/((R/M)*(273.15+T1))\n",
      "##RESULTS\n",
      "print'%s %.3f %s'%(' final pressure =',p2,'bar')\n",
      "print'%s %.4f %s'% ('change in entropy =',S1,'kJ/kg K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " final pressure = 1.667 bar\n",
        "change in entropy = 0.6222 kJ/kg K\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example7-pg 175"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "#calculate heat and change in entropy of system and change in entropy of enironment\n",
      "##initialisation of variables\n",
      "R= 8.314 ##J/mol K\n",
      "M= 29. ##gms\n",
      "T= 400. ##K\n",
      "p2= 1.6 ##bar\n",
      "p1= 1. ##bar\n",
      "Tenvir= 300. ##K\n",
      "##CALCULATIONS\n",
      "q= R*T*math.log(p2/p1)/M\n",
      "S= -R*math.log(p2/p1)/M\n",
      "Senvir= q/Tenvir\n",
      "##RESULTS\n",
      "print'%s %.1f %s'%('heat =',q,'kJ/kg')\n",
      "print'%s %.4f %s'%('change in entropy of system=',S,'kJ/kg K')\n",
      "print'%s %.4f %s'%('change in entropy of environment=',Senvir,'kJ/kg K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "heat = 53.9 kJ/kg\n",
        "change in entropy of system= -0.1347 kJ/kg K\n",
        "change in entropy of environment= 0.1797 kJ/kg K\n"
       ]
      }
     ],
     "prompt_number": 7
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Ex8-pg176"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import math\n",
      "##initialisation of variables\n",
      "m1= 5 ##kg\n",
      "c1= 1.26 ##kJ/kg K\n",
      "m2= 20 ##kg\n",
      "c2= 4.19 ##kJ/kg K\n",
      "T1= 95 ##C\n",
      "T2= 25 ##C\n",
      "##CALCULATIONS\n",
      "T= (m1*c1*T1+m2*c2*T2)/(m1*c1+m2*c2)\n",
      "S1= m1*c1*math.log((273.15+T)/(273.15+T1))\n",
      "S2= m2*c2*math.log((273.15+T)/(273.15+T2))\n",
      "S= S1+S2\n",
      "##RESULTS\n",
      "print'%s %.2f %s'% (' change in entropy of billet =',S1,' kJ/K')\n",
      "print'%s %.2f %s'% ('  change in entropy of water= ',S2,' kJ/kg K')\n",
      "print'%s %.2f %s'% ('  change in entropy of water=',S,' kJ/kg K')\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " change in entropy of billet = -1.23  kJ/K\n",
        "  change in entropy of water=  1.36  kJ/kg K\n",
        "  change in entropy of water= 0.14  kJ/kg K\n"
       ]
      }
     ],
     "prompt_number": 3
    }
   ],
   "metadata": {}
  }
 ]
}