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 "metadata": {
  "name": ""
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 6 :  Thermodynamic potentials"
     ]
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "Example 6.6  Page No : 218"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "# Variables\n",
      "m = 0.1;\t\t\t #mass of superheated steam in the piston cylinder assembly in kg\n",
      "P1 = 1.\t    \t\t #initial pressure of superheated steam in MPa\n",
      "T1 = 300.\t\t\t #initial temperature of superheated steam in degree celsius\n",
      "P2 = 0.1\t\t\t #pressure of steam after expansion in MPa\n",
      "T2 = 200.\t\t\t #temperature of steam after expansion in degree celsius\n",
      "\n",
      "# Calculations\n",
      "#For steam at P1 and T1:\n",
      "h1 = 3052.1\n",
      "v1 = 0.2580\n",
      "\n",
      "#For steam at P2 and T2:\n",
      "h2 = 2875.4\n",
      "v2 = 2.1720\n",
      "\n",
      "del_u = (((h1*10**3)-(P1*10**6*v1))-((h2*10**3)-(P2*10**6*v2)))*10**-3\n",
      "W = m*(del_u)\n",
      "\n",
      "# Results\n",
      "print \" The work done by steam = %0.2f kJ\"%(W);\n",
      "\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " The work done by steam = 13.59 kJ\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "Example 6.8  Page No : 220"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "# Variables\n",
      "P = 3.\t    \t\t #pressure of superheated steam in MPa\n",
      "Ti = 300.\t\t\t #temperature at which the steam enters the turbine in degree celsius\n",
      "m = 1.\t\t    \t #mass flow rate of steam in kg/s\n",
      "Te = 60.\t\t\t #temperature of dry saturated steam when it leaves the turbine in degree celsius\n",
      "\n",
      "# Calculations\n",
      "#For steam at P and Ti:\n",
      "h1 = 2995.1\t\t\t #specific entahlpy of steam in kJ/kg\n",
      "\n",
      "#For saturated steam at Te:\n",
      "h2 = 2609.7\t\t\t #specific enthalpy of saturated vapour in kJ/kg\n",
      "\n",
      "Ws = m*(h1-h2)\t\t # Calculations of the power  Results of the turbine using Eq.(6.83) in kW\n",
      "\n",
      "# Results\n",
      "print \" The power  Results of the turbine = %0.1f kW\"%(Ws);\n",
      "\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " The power  Results of the turbine = 385.4 kW\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "Example 6.10  Page No : 223"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "# Variables\n",
      "m = 0.1 \t\t\t #mass of superheated steam in the piston cylinder assembly in kg\n",
      "P1 = 3.\t    \t\t #initial pressure of superheated steam in MPa\n",
      "T1 = 300.\t\t\t #initial temperature of superheated steam in degree celsius\n",
      "T0 = 300.\t\t\t #temperature of the reservoir which is placed in thermal contact with the piston-cylinder assembly in degree celsius\n",
      "P2 = 0.1\t\t\t #pressure of steam after expansion in MPa\n",
      "\n",
      "#For steam at P1 and T1:\n",
      "h1 = 2995.1\n",
      "v1 = 0.08116\n",
      "s1 = 6.5422\n",
      "\n",
      "#For steam at P2 and T2:\n",
      "h2 = 3074.5\n",
      "v2 = 2.6390\n",
      "s2 = 8.2166\n",
      "\n",
      "# Calculations\n",
      "T0 = T0+273.15\n",
      "\n",
      "W = m*(h1-h2-(((P1*v1)-(P2*v2))*10**3)-(T0*(s1-s2)))\n",
      "\n",
      "# Results\n",
      "print \" The maximum work obtained from steam = %0.2f kJ\"%(W);\n",
      "\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " The maximum work obtained from steam = 90.07 kJ\n"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "heading",
     "level": 3,
     "metadata": {},
     "source": [
      "Example 6.12  Page No : 226"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "import math\n",
      "\n",
      "# Variables\n",
      "P1 = 0.1\t\t\t #pressure at which air enters the compressor in MPa\n",
      "T1 = 300.\t\t\t #temperature at which air enters the compressor in K\n",
      "P2 = 1. \t\t\t #pressure at which air leaves the compressor in MPa\n",
      "T2 = 300.\t\t\t #temperature at which air leaves the compressor in K\n",
      "T0 = 300.\t\t\t #ambient temperature in K\n",
      "N = 1.  \t\t\t #molar flow rate of air in mol/s\n",
      "gaamma = 1.4\t\t #ratio of specific heat capacities (no unit)\n",
      "R = 8.314\t\t\t #universal gas constant in J/molK\n",
      "\n",
      "# Calculations\n",
      "\n",
      "Ws = (-N*T0*(-R*math.log (P2/P1)))*10**-3\n",
      "\n",
      "# Results\n",
      "print \" The minimum power required to compress one mole per second of air = %0.3f kW\"%(Ws);\n",
      "\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        " The minimum power required to compress one mole per second of air = 5.743 kW\n"
       ]
      }
     ],
     "prompt_number": 4
    }
   ],
   "metadata": {}
  }
 ]
}