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 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "heading",
     "level": 1,
     "metadata": {},
     "source": [
      "Chapter 5 - The first law and the dynamic open system"
     ]
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 1 - Pg 68"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate the work done by the system and power\n",
      "#Initialization of variables\n",
      "rate= 5 #lbm/sec\n",
      "Q=50 #Btu/s\n",
      "h2=1020 #Btu/lbm\n",
      "h1=1000 #Btu/lbm\n",
      "V2=50 #ft/s\n",
      "V1=100 #ft/s\n",
      "J=778\n",
      "g=32.2 #ft/s^2\n",
      "gc=g\n",
      "Z2=0\n",
      "Z1=100. #ft\n",
      "#calculations\n",
      "dw=Q/rate -(h2-h1) -(V2**2- V1**2)/(2*gc*J) -g/gc *(Z2-Z1)/J\n",
      "power=dw*rate\n",
      "#results\n",
      "print '%s %.1f %s' %(\"work done by the system =\",dw,\"Btu/lbm\")\n",
      "print '%s %.1f %s' %(\"\\n Power =\",power,\"Btu/s\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "work done by the system = -9.7 Btu/lbm\n",
        "\n",
        " Power = -48.6 Btu/s\n"
       ]
      }
     ],
     "prompt_number": 1
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 2 - Pg 69"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate the area of inlet pipe\n",
      "#Initialization of variables\n",
      "V=100 #ft/s\n",
      "v=15. #lbm/ft^3\n",
      "m=5. #lbm/s\n",
      "#calculations\n",
      "A=m*v/V\n",
      "#results\n",
      "print '%s %.2f %s' %(\"Area of inlet pipe =\",A,\"ft^2\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Area of inlet pipe = 0.75 ft^2\n"
       ]
      }
     ],
     "prompt_number": 2
    },
    {
     "cell_type": "heading",
     "level": 2,
     "metadata": {},
     "source": [
      "Example 3 - Pg 79"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "#calculate the final temperature of the steam and change in temperature\n",
      "#Initialization of variables\n",
      "P=100. #psia\n",
      "#calculations\n",
      "print '%s' %(\"From table B-4\")\n",
      "h=1187.2 #Btu/lbm\n",
      "t1=328 #F\n",
      "t2=540 #F\n",
      "dt=t2-t1\n",
      "#results\n",
      "print '%s %d %s' %(\"Final temperature of the steam =\",t2,\"F\")\n",
      "print '%s %d %s' %(\"\\n Change in temperature =\",dt,\"F\")\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "From table B-4\n",
        "Final temperature of the steam = 540 F\n",
        "\n",
        " Change in temperature = 212 F\n"
       ]
      }
     ],
     "prompt_number": 3
    }
   ],
   "metadata": {}
  }
 ]
}