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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:d5b975c50e55ebe3a2b199f890473e0371318b3f156613b06dbc3a02621943c9"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter7-Heat engines and the second law of thermodynamics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example1 pg- 112"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate heat and efficency\n",
+      "##initialisation of variables\n",
+      "m= 0.35 ##kg\n",
+      "u2= 211.785 ##kJ/kg\n",
+      "u1= 182.267 ##kJ/kg\n",
+      "p2= 300. ##kPa\n",
+      "v3= 0.085566 ##kJ/kg\n",
+      "v2= 0.076218 ##kJ/kg\n",
+      "h3= 260.391 ##kJ/kg\n",
+      "h2= 234.650 ##kJ/kg\n",
+      "u4= 199.460 ##kJ/kg\n",
+      "u3= 234.721 ##kJ/kg\n",
+      "p4= 250.##kPa\n",
+      "v1= 0.076218 ##kJ/kg\n",
+      "v4= 0.085566 ##kJ/kg\n",
+      "h1= 201.322 ##kJ/kg\n",
+      "h4= 220.851 ##kJ/kg\n",
+      "##CALCULATIONS\n",
+      "Q12= m*(u2-u1)\n",
+      "W23= m*p2*(v3-v2)\n",
+      "Q23= m*(h3-h2)\n",
+      "W34= 0\n",
+      "Q34= m*(u4-u3)\n",
+      "W41= m*p4*(v1-v4)\n",
+      "Q41= m*(h1-h4)\n",
+      "dW= W23+W41\n",
+      "dQ= Q12+Q23+Q34+Q41\n",
+      "Qh= Q12+Q23\n",
+      "n= dW*100/Qh\n",
+      "##RESULTS\n",
+      "print'%s %.2f %s'%('heat = ',Qh,'kj')\n",
+      "print'%s %.2f %s'%('efficiency =',n, 'percent')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "heat =  19.34 kj\n",
+        "efficiency = 0.85 percent\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example4 pg-123"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#calculate effiecncy of heat engine and efficency\n",
+      "##initialisation of variables\n",
+      "Qc= 9 ##kW\n",
+      "W= 7.5 ##kW\n",
+      "Qh= Qc+W\n",
+      "Tc= 50 ##C\n",
+      "Th= 400 ##C\n",
+      "##CALCULATIONS\n",
+      "n= W/Qh\n",
+      "nrev= 1-((273.15+Tc)/(273.15+Th))\n",
+      "##RESULTS\n",
+      "print'%s %.3f %s'% ('efficiency of heat engine = ',n,'')\n",
+      "print'%s %.3f %s'%('efficiency =',nrev,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "efficiency of heat engine =  0.455 \n",
+        "efficiency = 0.520 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file