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diff --git a/Elementary_heat_Power_by_H_L_Solberg/Chapter13.ipynb b/Elementary_heat_Power_by_H_L_Solberg/Chapter13.ipynb
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+{
+ "metadata": {
+  "name": "Chapter 13"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Mechanical Refrigeration"
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Example 13.2,Page 596"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nmr=3.0 #lb\nmj=5.0 #lb\nt2=67.0 #F\nt1=60.0 #lb\nihp=7.25\n#\"From mollier charts\"\nh4=709 #Btu/b\nh3=618 #Btu/lb\n\n#calculations\nenergyin=ihp*2545/60\nenergyout=mr*(h4-h3) + mj*(t2-t1)\n\n#results\nprint \"Energy in  Btu/min\",round(energyin,3)\nprint \"Energy out  Btu/min\",round(energyout,3)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Energy in  Btu/min 307.521\nEnergy out  Btu/min 308.0\n"
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": "Example 13.3,Page 602"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nr=3.0 #lb\nhp=10.0 #hp\n\n#calculations\nh3=618 #Btu/lb\nh1=131 #Btu/lb\nQe=mr*(h3-h1)\nwork=hp*2545/60\ncop=Qe/work\n\n#results\nprint \"Coefficient of performance \",round(cop,3)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Coefficient of performance  3.444\n"
+      }
+     ],
+     "prompt_number": 11
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file