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   "source": [
    "# Chapter 5 The first law and the dynamic open system"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:5.2 Pg:105"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "work done by the system = -9.7 Btu/lbm\n",
      "\n",
      " Power = -48.6 Btu/s\n"
     ]
    }
   ],
   "source": [
    "## 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 \"work done by the system = %.1f Btu/lbm\"%(dw)\n",
    "print \"\\n Power = %.1f Btu/s\"%(power)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:5.3 Pg:106"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Area of inlet pipe = 0.75 ft**2\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "V=100.0 #ft/s\n",
    "v=15 #lbm/ft**3\n",
    "m=5 #lbm/s\n",
    "#calculations\n",
    "A=m*v/V\n",
    "#results\n",
    "print \"Area of inlet pipe = %.2f ft**2\"%(A)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:5.4 Pg:106"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From table B-4\n",
      "Final temperature of the steam = 540 F\n",
      "\n",
      " Change in temperature = 212 F\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "P=100.0 #psia\n",
    "#calculations\n",
    "print \"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 \"Final temperature of the steam = %d F\"%(t2)\n",
    "print \"\\n Change in temperature = %d F\"%(dt)"
   ]
  }
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