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   "source": [
    "# Chapter 9 Properties of the pure substance"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.1 Pg:304"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From steam tables,\n",
      "Internal energy = -0.0002625 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "T=32 #F\n",
    "m=1 #lbm\n",
    "J=778.16\n",
    "#calculations\n",
    "print \"From steam tables,\"\n",
    "hf=0 \n",
    "p=0.08854 #psia\n",
    "vf=0.01602 #ft**3/lbm\n",
    "u=hf-p*144*vf/J\n",
    "#results\n",
    "print \"Internal energy = %.7f Btu/lbm\"%(u)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.2 Pg:305"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "from steam tables,\n",
      "Change in entropy = 0.351 Btu/lbm R\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "P=40 #psia\n",
    "#calculations\n",
    "print \"from steam tables,\"\n",
    "hf=200.8 #Btu/lbm\n",
    "hg=27 #Btu/lbm\n",
    "T=495  #R\n",
    "ds=(hf-hg)/T\n",
    "#results\n",
    "print \"Change in entropy = %.3f Btu/lbm R\"%(ds)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.3 Pg:305"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From table B-14,\n",
      "specific enthalpy = 36.0 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "x=0.35\n",
    "T=18 #F\n",
    "#calculations\n",
    "print \"From table B-14,\"\n",
    "hf=12.12 #Btu/lbm\n",
    "hg=80.27 #Btu.lbm\n",
    "hfg=-hf+hg\n",
    "h=hf+x*hfg\n",
    "#results\n",
    "print \"specific enthalpy = %.1f Btu/lbm\"%(h)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.4 Pg:306"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From table B-14,\n",
      "Heat required = 49.71 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "x=0.35\n",
    "T=18 #F\n",
    "T2=55.5 #F\n",
    "#calculations\n",
    "print \"From table B-14,\"\n",
    "hf=12.12 #Btu/lbm\n",
    "hg=80.27 #Btu.lbm\n",
    "hfg=-hf+hg\n",
    "h=hf+x*hfg\n",
    "h2=85.68 #Btu/lbm\n",
    "dh=h2-h\n",
    "#results\n",
    "print \"Heat required = %.2f Btu/lbm\"%(dh)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.5 Pg:307"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From mollier chart,\n",
      "enthalpy = 120 Btu/lbm\n",
      "\n",
      " Qulaity = 0.83\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "P=1460 #psia\n",
    "T=135 #F\n",
    "P2=700 #psia\n",
    "#calculations\n",
    "print \"From mollier chart,\"\n",
    "h=120 #Btu/lbm\n",
    "x=0.83\n",
    "#results\n",
    "print \"enthalpy = %d Btu/lbm\"%(h)\n",
    "print \"\\n Qulaity = %.2f\"%(x)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.6 Pg:307"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From table 3,\n",
      "Heat transferred = 11.4 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "m=1 #lbm\n",
    "P1=144 #psia\n",
    "P2=150 #psia\n",
    "T1=360 #F\n",
    "J=778.16\n",
    "#calculations\n",
    "print \"From table 3,\"\n",
    "v1=3.160 #ft**3/lbm\n",
    "h1=1196.5 #Btu/lbm\n",
    "u1=h1-P1*144*v1/J\n",
    "h2=1211.4 #Btu/lbm\n",
    "u2=h2-P2*144*v1/J\n",
    "dq=u2-u1\n",
    "#results\n",
    "print \"Heat transferred = %.1f Btu/lbm\"%(dq)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.7 Pg:307"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From table 3,\n",
      "Work done = -3.0 Btu/lbm\n",
      "\n",
      " In case 2, work required = -5.0 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "T1=100 #F\n",
    "P2=1000 #psia\n",
    "x=0.6\n",
    "J=778.16\n",
    "#calculations\n",
    "print \"From table 3,\"\n",
    "v=0.01613 #ft**3/lbm\n",
    "P1=0.9 #psia\n",
    "wrev=-v*(P2-P1)*144/J\n",
    "dv=0.000051 #ft**3/lbm\n",
    "wcomp=(P2+P1)/2 *dv*144/J\n",
    "wact=wrev/x\n",
    "#results\n",
    "print \"Work done = %.1f Btu/lbm\"%(wrev)\n",
    "print \"\\n In case 2, work required = %.1f Btu/lbm\"%(wact)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.8 Pg:308"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "from steam table 2,\n",
      "Heat transferred = 1120.8 Btu/lbm\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "pa=1000 #atm\n",
    "ta=100 #F\n",
    "#calculations\n",
    "hf=67.97 #Btu/lbm\n",
    "w=3 #Btu/lbm\n",
    "ha=hf+w\n",
    "print \"from steam table 2,\"\n",
    "hc=1191.8 #Btu/lbm\n",
    "qrev=hc-ha\n",
    "#results\n",
    "print \"Heat transferred = %.1f Btu/lbm\"%(qrev)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.9 Pg:309"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From steam tables,\n",
      "Work done = 266 Btu/lbm\n",
      "\n",
      " work done in case 2 = 186.8 Btu/lbm\n",
      "\n",
      " Final state pressure = 3 psia\n",
      "The answer is a bit different due to rounding off error in textbook\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "P1=144 #psia\n",
    "T1=400 #F\n",
    "y=0.7\n",
    "#calculations\n",
    "print \"From steam tables,\"\n",
    "h1=1220.4 #Btu/lbm\n",
    "s1=1.6050 #Btu/lbm R\n",
    "s2=1.6050 #Btu/lbm R\n",
    "P2=3 #psia\n",
    "sf=0.2008 #Btu/lbm R\n",
    "sfg=1.6855 #Btu/lbm R\n",
    "x=(s1-sf)/sfg\n",
    "hf=109.37 #Btu/lbm\n",
    "hfg=1013.2 #Btu/#bm\n",
    "h2=hf+x*hfg\n",
    "work=h1-h2\n",
    "dw=y*work\n",
    "h2d=h1-dw\n",
    "#results\n",
    "print \"Work done = %d Btu/lbm\"%(work)\n",
    "print \"\\n work done in case 2 = %.1f Btu/lbm\"%(dw)\n",
    "print \"\\n Final state pressure = %d psia\"%(P2)\n",
    "print \"The answer is a bit different due to rounding off error in textbook\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Ex:9.10 Pg:309"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "From steam tables,\n",
      "Quality of wet steam = 99.8 percent\n"
     ]
    }
   ],
   "source": [
    "#Initialization of variables\n",
    "pb=14.696 #psia\n",
    "pa=150 #psia\n",
    "tb=300 #F\n",
    "#calculations\n",
    "print \"From steam tables,\"\n",
    "hb=1192.8 #Btu/lbm\n",
    "ha=hb\n",
    "hf=330.51 #Btu/lbm\n",
    "hfg=863.6 #Btu/lbm\n",
    "x=(ha-hf)/hfg\n",
    "#results\n",
    "print \"Quality of wet steam = %.1f percent\"%(x*100)"
   ]
  }
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