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diff --git a/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_24.ipynb b/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_24.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 24 - Refrigeration"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1 - Pg 461"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#calculate the cop in both cases and also the piston displacement\n",
+      "#initialization of varaibles\n",
+      "print '%s' %(\"From tables,\")\n",
+      "h1=611.8 #B/lb\n",
+      "h2=704.4 #B/lb\n",
+      "h3=127.4 #B/lb\n",
+      "h4=h3\n",
+      "T2=460. #R\n",
+      "T1=76+460. #R\n",
+      "W=10000. #B/hr\n",
+      "e=0.7\n",
+      "#calculations\n",
+      "Qe=h1-h4\n",
+      "Wc=h2-h1\n",
+      "CP=Qe/Wc\n",
+      "CP2=T2/(T1-T2)\n",
+      "w=W/(Qe*60.)\n",
+      "v1=9.116 #cu ft/lb\n",
+      "PD=w*v1/(e)\n",
+      "#results\n",
+      "print '%s %.2f' %(\"Coefficient of performance in case 1 = \",CP)\n",
+      "print '%s %.2f' %(\"\\n Coefficient of performance in case 2 = \",CP2)\n",
+      "print '%s %.2f %s' %(\"\\n Piston displacement =\",PD,\"cu ft/min\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "From tables,\n",
+        "Coefficient of performance in case 1 =  5.23\n",
+        "\n",
+        " Coefficient of performance in case 2 =  6.05\n",
+        "\n",
+        " Piston displacement = 4.48 cu ft/min\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file