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diff --git a/Elements_of_Thermodynamics_and_heat_transfer/Chapter_15_1.ipynb b/Elements_of_Thermodynamics_and_heat_transfer/Chapter_15_1.ipynb
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+{

+ "metadata": {

+  "name": "",

+  "signature": "sha256:d49c3ebbe462c89b25518f64eebe9040738bf2ef82ee8e4dec85ee0229afc06b"

+ },

+ "nbformat": 3,

+ "nbformat_minor": 0,

+ "worksheets": [

+  {

+   "cells": [

+    {

+     "cell_type": "heading",

+     "level": 1,

+     "metadata": {},

+     "source": [

+      "Chapter 15 - Vapor cycles and processes"

+     ]

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Example 1 - Pg 276"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#calculate the Thermal efficiency and Furnace efficiency\n",

+      "#Initialization of variables\n",

+      "p1=600. #psia\n",

+      "p2=0.2563 #psia\n",

+      "t1=486.21 #F\n",

+      "t2=60. #F\n",

+      "fur=0.75\n",

+      "#calculations\n",

+      "print '%s' %(\"from steam tables,\")\n",

+      "h1=1203.2\n",

+      "hf1=471.6\n",

+      "hfg1=731.6\n",

+      "h2=1088\n",

+      "hf2=28.06\n",

+      "hfg2=1059.9\n",

+      "s1=1.4454\n",

+      "sf1=0.6720\n",

+      "sfg1=0.7734\n",

+      "s2=2.0948\n",

+      "sf2=0.0555\n",

+      "sfg2=2.0393\n",

+      "xd=(s1-sf2)/sfg2\n",

+      "hd=hf2+xd*hfg2\n",

+      "xa=0.3023\n",

+      "ha=hf2+xa*hfg2\n",

+      "wbc=0\n",

+      "wda=0\n",

+      "wcd=h1-hd\n",

+      "wab=ha-hf1\n",

+      "W=wab+wcd+wbc+wda\n",

+      "Wrev=hfg1- (t2+459.7)*sfg1\n",

+      "etat=(t1-t2)/(t1+459.7)*100\n",

+      "eta=fur*etat\n",

+      "#results\n",

+      "print '%s %d %s' %(\"Thermal efficiency =\",etat,\"percent\")\n",

+      "print '%s %.1f %s' %(\"\\n Furnace efficiency =\",eta,\" percent\")\n",

+      "\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "from steam tables,\n",

+        "Thermal efficiency = 45 percent\n",

+        "\n",

+        " Furnace efficiency = 33.8  percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 1

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Example 2 - Pg 277"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#calculate the Thermal and Overall efficiency\n",

+      "#Initialization of variables\n",

+      "dhab=-123.1\n",

+      "etac=0.5\n",

+      "ha=348.5\n",

+      "etaf=0.75\n",

+      "eta=0.85\n",

+      "hf=471.6\n",

+      "hfg=731.6\n",

+      "hc=1203.2\n",

+      "dhcd=452.7\n",

+      "#calculations\n",

+      "dwabs=dhab/etac\n",

+      "hbd=ha-dwabs\n",

+      "dwcds=dhcd*eta\n",

+      "dqa=hc-hbd\n",

+      "etat=(dwcds+dwabs)/dqa*100.\n",

+      "eta=etat*etaf\n",

+      "#results\n",

+      "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\" percent\")\n",

+      "print '%s %.1f %s' %(\"\\n Overall efficiency = \",eta,\" percent\")\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "Thermal efficiency = 22.8  percent\n",

+        "\n",

+        " Overall efficiency =  17.1  percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 2

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Example 3 - Pg 277"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#calculate the Thermal and Overall efficiency\n",

+      "#Initialization of variables\n",

+      "t=60 #F\n",

+      "J=778.16\n",

+      "p1=600 #psia\n",

+      "p2=0.2563 #psia\n",

+      "etaf=0.85 \n",

+      "#calculations\n",

+      "print '%s' %(\"From steam tables,\")\n",

+      "vf=0.01604 #ft^3/lbm\n",

+      "dw=-vf*(p1-p2)*144/J\n",

+      "ha=28.06 #Btu/lbm\n",

+      "hb=29.84 #Btu/lbm\n",

+      "hd=1203.2 #Btu/lbm\n",

+      "he=750.5 #Btu/lbm\n",

+      "dqa=hd-hb\n",

+      "dqr=ha-he\n",

+      "dw=dqa+dqr\n",

+      "dwturb=hd-he\n",

+      "dwpump=ha-hb\n",

+      "etat=dw/dqa*100.\n",

+      "eta=etat*etaf\n",

+      "#results\n",

+      "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\" percent\")\n",

+      "print '%s %.1f %s' %(\"\\n Overall efficiency =\",eta,\"percent\")\n",

+      "    \n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "From steam tables,\n",

+        "Thermal efficiency = 38.4  percent\n",

+        "\n",

+        " Overall efficiency = 32.7 percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 3

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Example 4 - Pg 278"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#calculate the Thermal and Overall efficiency\n",

+      "#Initialization of variables\n",

+      "dhab=-1.78\n",

+      "etac=0.5\n",

+      "ha=28.06\n",

+      "eta=0.85\n",

+      "hf=471.6\n",

+      "hfg=731.6\n",

+      "hd=1203.2\n",

+      "dhcd=452.7\n",

+      "#calculations\n",

+      "dwabs=dhab/etac\n",

+      "hbd=ha-dwabs\n",

+      "dwcds=dhcd*eta\n",

+      "dqa=hd-hbd\n",

+      "etat=(dwcds+dwabs)/dqa*100.\n",

+      "eta=etat*eta\n",

+      "#results\n",

+      "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\"percent\")\n",

+      "print '%s %.1f %s' %(\"\\n Overall efficiency =\",eta,\"percent\")\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "Thermal efficiency = 32.5 percent\n",

+        "\n",

+        " Overall efficiency = 27.7 percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 4

+    },

+    {

+     "cell_type": "heading",

+     "level": 2,

+     "metadata": {},

+     "source": [

+      "Example 5 - Pg 287"

+     ]

+    },

+    {

+     "cell_type": "code",

+     "collapsed": false,

+     "input": [

+      "#calculate the thermal efficiency\n",

+      "#Initialization of variables\n",

+      "p2=600 #psia\n",

+      "p1=44 #psia\n",

+      "te=486.21 #F\n",

+      "tb=273.1 #F\n",

+      "J=778.16\n",

+      "p3=0.25 #psia\n",

+      "#calculations\n",

+      "hc=241.9\n",

+      "hj=834.6\n",

+      "y=1-0.805\n",

+      "v1=0.0172\n",

+      "v2=0.016\n",

+      "ha=28.06\n",

+      "hd=hc+v1*(p2-p1)*144/J\n",

+      "hb=ha+v2*(p1-p3)*144/J\n",

+      "hh=1374\n",

+      "Qa=hh-hd\n",

+      "Qr=(ha-hj)*(1-y)\n",

+      "etat=(Qa+Qr)/Qa*100.\n",

+      "#results\n",

+      "print '%s %.1f %s' %(\"thermal efficiency =\",etat,\"percent\")\n",

+      "\n"

+     ],

+     "language": "python",

+     "metadata": {},

+     "outputs": [

+      {

+       "output_type": "stream",

+       "stream": "stdout",

+       "text": [

+        "thermal efficiency = 42.6 percent\n"

+       ]

+      }

+     ],

+     "prompt_number": 5

+    }

+   ],

+   "metadata": {}

+  }

+ ]

+}
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