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diff --git a/Thermodynamics_An_Engineering_Approach/Chapter6.ipynb b/Thermodynamics_An_Engineering_Approach/Chapter6.ipynb
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-{

- "metadata": {

-  "name": ""

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "Chapter 6: The Second Law of Thermodynamics"

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-1 ,Page No.286"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "QH=80.0;#rate of heat transfer in MW\n",

-      "QL=50.0;#rate of waste heat rejection in MW\n",

-      "\n",

-      "#calculations\n",

-      "Wnet=QH-QL;\n",

-      "print'net power output %i MW'%Wnet\n",

-      "nth=Wnet/QH;\n",

-      "print'the thermal efficiency is %f '%round(nth,3)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "net power output 30 MW\n",

-        "the thermal efficiency is 0.375000 \n"

-       ]

-      }

-     ],

-     "prompt_number": 1

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-2 ,Page No.286"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "Wnet=65;#power output in hp\n",

-      "nth=0.24;#effficiency of car\n",

-      "HV=19000;#heating value in Btu/lbm\n",

-      "\n",

-      "#calculations\n",

-      "QH=Wnet/nth*2545;#factor of 2545 to convert to Btu/h\n",

-      "m=QH/HV;\n",

-      "print'the engine must burn at fuel rate %f lbm/h'%round(m,1)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "the engine must burn at fuel rate 36.300000 lbm/h\n"

-       ]

-      }

-     ],

-     "prompt_number": 2

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-3 ,Page No.291"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "Wnet=2.0;#power input in kW\n",

-      "QL=360.0;#rate of heat rejection in kJ/min\n",

-      "\n",

-      "#calculations\n",

-      "COPR=QL/Wnet/60;#factor of 60 to convert kW to kJ/min\n",

-      "print'coefficient of performance of refrigerator is %i'%COPR;\n",

-      "QH=QL+Wnet*60;#factor of 60 to convert kW to kJ/min\n",

-      "print'heat rejection rate %i kJ/min'%QH\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "coefficient of performance of refrigerator is 3\n",

-        "heat rejection rate 480 kJ/min\n"

-       ]

-      }

-     ],

-     "prompt_number": 4

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-4 ,Page No.291"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "COP=2.5;#COP in the given conditions of heat pump\n",

-      "QH=80000.0;#heat loss rate in kJ/hr\n",

-      "\n",

-      "#calculations\n",

-      "Wnet=QH/COP;\n",

-      "print'the power consumed %i kJ/h'%Wnet\n",

-      "QL=QH-Wnet;\n",

-      "print'the rate at which heat is absorbed %i kJ/h'%QL\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "the power consumed 32000 kJ/h\n",

-        "the rate at which heat is absorbed 48000 kJ/h\n"

-       ]

-      }

-     ],

-     "prompt_number": 5

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-5 ,Page No.306"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "QH=500.0;#heat recieved per cycle in kJ\n",

-      "TL=30+273.0;#low temperature source in C\n",

-      "TH=652+273.0;#high temperature source in C\n",

-      "\n",

-      "#calculations\n",

-      "nth=1-TL/TH;\n",

-      "print'the thermal efficiency of carnot engine is %f'%round(nth,3);\n",

-      "QL=TL*QH/TH;\n",

-      "print'the amount of heat rejected to the sink per cycle %i kJ'%round(QL)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "the thermal efficiency of carnot engine is 0.672000\n",

-        "the amount of heat rejected to the sink per cycle 164 kJ\n"

-       ]

-      }

-     ],

-     "prompt_number": 6

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-6 ,Page No.310"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "COP=13.5;#COP of refrigerator\n",

-      "TH=75+460.0;#room temperature in R\n",

-      "TL=35+460.0;#refrigerated temp in R\n",

-      "\n",

-      "#calculations\n",

-      "COPR=1/(TH/TL-1);\n",

-      "if COPR>=COP:\n",

-      "    print('claim is true');\n",

-      "else:\n",

-      "    print('claim is false')\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "claim is false\n"

-       ]

-      }

-     ],

-     "prompt_number": 9

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-7 ,Page No.310"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "TL=-5+273.0;#in C\n",

-      "TH=21+273.0;#house temp in C\n",

-      "QH=135000.0/3600;#heat loss rate in kW\n",

-      "\n",

-      "#calculations\n",

-      "COPHP=1/(1-TL/TH);\n",

-      "Wnet=QH/COPHP;\n",

-      "print'minimum power required %f kW'%round(Wnet,2)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "minimum power required 3.320000 kW\n"

-       ]

-      }

-     ],

-     "prompt_number": 2

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example 6-8 ,Page No.314"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#given data\n",

-      "Qrefrig=40.0;#heat load on referigerator in W\n",

-      "COPR=1.3;#COP of referigerator\n",

-      "Wlight=40.0;#rated power of bulb in W\n",

-      "\n",

-      "#calculation\n",

-      "Wrefrig=Qrefrig/COPR;\n",

-      "Wt=Wrefrig+Wlight;\n",

-      "AnHr=365*24;#annual hours\n",

-      "NOH=20*30/3600.0*365;#normal operating hours\n",

-      "AOP=AnHr-NOH;#addtional operating hours\n",

-      "APC=Wt*AOP/1000;#additional power consumption; fator of 1000 to convert to kW\n",

-      "print'increase in power consumption %i kWh/yr'%round(APC);\n",

-      "print'increase in cost S%f/yr'%round((APC)*0.08,1)\n"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "increase in power consumption 616 kWh/yr\n",

-        "increase in cost S49.300000/yr\n"

-       ]

-      }

-     ],

-     "prompt_number": 3

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
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