{
 "metadata": {
  "name": ""
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 11 - Properties of Gases"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 1 - Pg 172"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate the volume of the appratus\n",
      "#initialization of varaibles\n",
      "P1=15. #psia\n",
      "T1=80+460. #R\n",
      "dm=3. #lb\n",
      "T2=75+460. #R\n",
      "P2=25. #psia\n",
      "#calculations\n",
      "mratio=P1*T2/(P2*T1)\n",
      "m2=dm/(1-mratio)\n",
      "V2=m2*55.16*T2/(P2*144.)\n",
      "#results\n",
      "print '%s %.1f %s' %(\"Volume of the apparatus =\",V2,\"cu ft\")\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": [
        "Volume of the apparatus = 60.6 cu ft\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 176"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Calculate the specific heats at constant pressure and volume\n",
      "#initialization of varaibles\n",
      "R=48.3 #ft lb/lb R\n",
      "k=1.4\n",
      "#calculations\n",
      "dc=R/778.\n",
      "cp=k*dc/(k-1)\n",
      "cv=cp/k\n",
      "#results\n",
      "print '%s %.3f %s' %(\"Specific heat at constant volume = \",cv,\"B/lb R\")\n",
      "print '%s %.3f %s' %(\"\\n Specific heat at constant pressure = \",cp,\"B/lb R\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Specific heat at constant volume =  0.155 B/lb R\n",
        "\n",
        " Specific heat at constant pressure =  0.217 B/lb R\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 3 - Pg 177"
     ]
    },
    {
     "cell_type": "raw",
     "metadata": {},
     "source": [
      "This is a theoretical example."
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      " Example 4 - Pg 180"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Calculate the enthalpy generated\n",
      "#initialization of varaibles\n",
      "import math\n",
      "P1=100. #psia\n",
      "P2=10. #psia\n",
      "T1=140. +460 #R\n",
      "g=1.4\n",
      "cp=0.248\n",
      "#calculations\n",
      "dh=g*55.16*T1*(math.pow((P2/P1),((g-1)/g)) -1)/(g-1)*0.01286 #0.01286 is the conversion factor\n",
      "T2=T1*math.pow((P2/P1),((g-1)/g))\n",
      "dh2=cp*(T2-T1)\n",
      "#results\n",
      "print '%s %d %s' %(\"In method 1, Enthalpy = \",dh,\"Btu/lb\")\n",
      "print '%s %.1f %s' %(\"\\n In method 2, Enthalpy =\",dh2,\"ft lb/lb\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "In method 1, Enthalpy =  -718 Btu/lb\n",
        "\n",
        " In method 2, Enthalpy = -71.7 ft lb/lb\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 5a - Pg 186"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Calculate the changes in Enthalpy and Specific Volume\n",
      "#initialization of varaibles\n",
      "import math\n",
      "P1=100. #psia\n",
      "T1=2000.+460 #R\n",
      "P2=15. #psia\n",
      "g=1.4\n",
      "cp=0.24\n",
      "#calculations\n",
      "v1=53.34*T1/(P1*144.)\n",
      "v2=53.34*T1*math.pow((P1/P2),(1/g)) /(P1*144)\n",
      "T2=T1*P2*v2/(P1*v1)\n",
      "dh=cp*(T2-T1)\n",
      "dv=v2-v1\n",
      "#results\n",
      "print '%s %d %s' %(\"Change in enthalpy =\",dh,\"B/lb\")\n",
      "print '%s %.1f %s' %(\"\\n Specific volume change = \",dv,\"cu ft/lb\")\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": [
        "Change in enthalpy = -247 B/lb\n",
        "\n",
        " Specific volume change =  26.2 cu ft/lb\n",
        "The answer is a bit different due to rounding off error in textbook\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 5b - Pg 186"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Calculate the changes in Enthalpy and Specific Volume\n",
      "#initialization of varaibles\n",
      "import math\n",
      "P1=100. #psia\n",
      "T1=2000.+460 #R\n",
      "P2=15. #psia\n",
      "g=1.4\n",
      "cp=0.276\n",
      "cv=0.207\n",
      "T2=1520. #R\n",
      "#calculations\n",
      "k=cp/cv\n",
      "v1=53.34*T1/(P1*144)\n",
      "v2=v1*math.pow((P1/P2),(1/k))\n",
      "dh=cp*(T2-T1)\n",
      "dv=v2-v1\n",
      "#results\n",
      "print '%s %d %s' %(\"Enthalpy change =\",dh,\"B/lb\")\n",
      "print '%s %.1f %s' %(\"\\n Volume change =\",dv,\"cu t/lb\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Enthalpy change = -259 B/lb\n",
        "\n",
        " Volume change = 28.7 cu t/lb\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 5c - Pg 186"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#Calculate the changes in Enthalpy and Specific Volume\n",
      "#initialization of varaibles\n",
      "import math\n",
      "P1=100. #psia\n",
      "T1=2000.+460 #R\n",
      "P2=15. #psia\n",
      "g=1.4\n",
      "cp=0.276\n",
      "cv=0.207\n",
      "T2=1520. #R\n",
      "#calculations\n",
      "h1=634.4\n",
      "pr1=407.3\n",
      "pr2=pr1*P2/P1\n",
      "print '%s' %(\"From table 1,\")\n",
      "T2=1535. #R\n",
      "h2=378.44\n",
      "dh=h2-h1\n",
      "v1=53.34*T1/(P1*144)\n",
      "v2=53.34*T2/(P2*144.)\n",
      "dv=v2-v1\n",
      "#results\n",
      "print '%s %.2f %s' %(\"Enthalpy change = \",dh,\"B/lb\")\n",
      "print '%s %.1f %s' %(\"\\n Volume change =\",dv,\"cu ft/lb\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "From table 1,\n",
        "Enthalpy change =  -255.96 B/lb\n",
        "\n",
        " Volume change = 28.8 cu ft/lb\n"
       ]
      }
     ],
     "prompt_number": 6
    }
   ],
   "metadata": {}
  }
 ]
}