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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:8b62be1f41dd311c1ab38e8f1f5050fc85b3e25eb123d081120fb3bbfeaaa74a"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 6 :\n",
+      "The second law of\n",
+      "thermodynamics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.1 pg : 140"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "m = 5. \t    \t    \t#lbm\n",
+      "P = 50. \t    \t\t#psia\n",
+      "T = 500. + 460 \t\t\t#R\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "s1 = 0.4110 \t\t\t#B/lbm R\n",
+      "s2 = 1.7887 \t\t\t#B/lbm R\n",
+      "dS = m*(s2-s1)\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Change in entropy  =  %.3f B/R\"%(dS)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Change in entropy  =  6.888 B/R\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.2 pg : 140"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "P = 20.          \t\t\t#psia\n",
+      "T = 227.96+ 459.69 \t\t\t#R\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "sfg = 1.3962 \t\t\t#B/ R lbm\n",
+      "Q = T*sfg\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"heat transfer  =  %.1f B/lbm\"%(Q)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "heat transfer  =  960.1 B/lbm\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.3 pg : 141"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\t\t\t\n",
+      "# Variables\n",
+      "T1 = 100.+460 \t\t\t#R\n",
+      "P1 = 15.    \t\t\t#psia\n",
+      "P2 = 50. \t    \t\t#psia\n",
+      "n = 1.3\n",
+      "cp = 0.24\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "T2 = T1*(P2/P1)**((n-1)/n)\n",
+      "dS = cp*math.log(T2/T1) - 53.35/778 *math.log(P2/P1) \n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Change in entropy  =  %.3f B/lbm R\"%(dS)\n",
+      "\t\t\t#the answer given in textbook is wrong. Please check it using a calculator\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Change in entropy  =  -0.016 B/lbm R\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.4 pg : 141"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\t\t\t\n",
+      "# Variables\n",
+      "T1 = 85.+460 \t\t\t#R\n",
+      "T2 = T1\n",
+      "cp = 0.24\n",
+      "P2 = 15. \t\t\t#psia\n",
+      "P1 = 30. \t\t\t#psia\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "dS = cp*math.log(T2/T1) - 53.35/778 *math.log(P2/P1)\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Change in entropy  =  %.4f B/lbm R\"%(dS)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Change in entropy  =  0.0475 B/lbm R\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.5 pg : 142"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "Qh = -1000. \t\t\t#Btu\n",
+      "Ql = 1000.   \t\t\t#Btu\n",
+      "Th = 1460. \t    \t\t#R\n",
+      "Tl = 960. \t\t    \t#R\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "Sh = Qh/Th\n",
+      "Sl = Ql/Tl\n",
+      "S = Sh+Sl\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Change in entropy of the universe  =  %.3f B/R\"%(S)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Change in entropy of the universe  =  0.357 B/R\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 6.6 pg : 143"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\t\t\t\n",
+      "# Variables\n",
+      "h1 = 1416.4 \t\t\t#B/lbm\n",
+      "s1 = 1.6842 \t\t\t#B/lbm R\n",
+      "\t\t\t\n",
+      "# Calculations\n",
+      "s2 = s1\n",
+      "P2 = 50. \t\t\t#psia\n",
+      "T2 = 317.5 \t\t\t#F\n",
+      "h2 = 1193.7\n",
+      "W = h2-h1\n",
+      "\t\t\t\n",
+      "# Results\n",
+      "print \"Work calculated  =  %.1f B/lbm\"%(W)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Work calculated  =  -222.7 B/lbm\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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