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  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 10: Refrigeration"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 10.1, page no. 193"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "#initialization\n",
      "capacity = 5.0                 #tons\n",
      "hp = 10.0                       #hp\n",
      "\n",
      "#calculation\n",
      "beta = (778*3.33*capacity)/(hp*550)\n",
      "\n",
      "#result\n",
      "print \"Coefficient of performance  = \", round(beta, 2)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Coefficient of performance  =  2.36\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 10.2, page no. 197"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "#initialization\n",
      "P1 = 30.0                   #lb/in^2\n",
      "P2 = 200.0                  #lb/in^2\n",
      "capacity = 3.0              #tons\n",
      "\n",
      "#calculation\n",
      "#From the pressure enthalpy chart\n",
      "Tt1 =  -1                   #F\n",
      "st1 = 1.34\n",
      "ht1 = 612.0\n",
      "ht2 = 733.0\n",
      "ht3 = 141.0\n",
      "ht4 = 141.0\n",
      "WbyJ = ht2-ht1\n",
      "Q = ht1-ht3\n",
      "beta = Q/WbyJ\n",
      "Qdot = capacity*3.33\n",
      "wdot = Qdot/Q\n",
      "Power = wdot*778*WbyJ\n",
      "Power = Power/550.0\n",
      "\n",
      "#result\n",
      "print \"Coefficient of performance  =  \", round(beta, 2)\n",
      "print \"Evarator temperature  =  %d F\" %Tt1\n",
      "print \"Power required  =  %.2f hp\" %Power\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Coefficient of performance  =   3.89\n",
        "Evarator temperature  =  -1 F\n",
        "Power required  =  3.63 hp\n"
       ]
      }
     ],
     "prompt_number": 13
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 10.3, page no. 200"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "\n",
      "#initialization\n",
      "P1 = 14.0                   #lb/in^2\n",
      "P2 = 60.0                   #lb/in^2\n",
      "Tt1 = 80+460.0              #R\n",
      "Tt4 = -20+460.0             #R\n",
      "m = 30.0                    #lbm/sec\n",
      "cp = 0.24\n",
      "\n",
      "#calculation\n",
      "Tt2 = round(Tt1*(P2/P1)**(0.286))\n",
      "Tt3 = round(Tt4*(P2/P1)**(0.286))\n",
      "WbyJ1 = cp*(Tt2-Tt1)\n",
      "WbyJ2 = cp*(Tt3-Tt4)\n",
      "Q = cp*(Tt1-Tt4)\n",
      "beta = Q/(WbyJ1-WbyJ2)\n",
      "Power = (m*778)*(WbyJ1-WbyJ2)\n",
      "Wdot = Power/550.0\n",
      "\n",
      "#result\n",
      "print \"Coefficient of performance  =  %.3f\" %beta\n",
      "print \"Net power  =  %d hp\" %Wdot\n",
      "\n",
      "#difference in answer due to rounding of in Python"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Coefficient of performance  =  1.923\n",
        "Net power  =  529 hp\n"
       ]
      }
     ],
     "prompt_number": 24
    }
   ],
   "metadata": {}
  }
 ]
}