{ "metadata": { "name": "", "signature": "sha256:9a6776975ca26711999c009e1ea80f5d9873f1eba4664269073ed9b23e69c74f" }, "nbformat": 3, "nbformat_minor": 0, "worksheets": [ { "cells": [ { "cell_type": "heading", "level": 1, "metadata": {}, "source": [ "Chapter 10 :\n", "Gaseous Mixtures" ] }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.1 pg : 262" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "m = 2. \n", "M = 28.\n", "M2 = 32.\n", "PN = 300. \t\t\t#psia\n", "Pt = 400.\t\t\t#psia\n", "\t\t\t\n", "# Calculations\n", "nN = m/M\n", "PO = Pt-PN\n", "nO = nN*PO/PN\n", "mO = M2*nO\n", "\t\t\t\n", "# Results\n", "print \"Mass of oxygen added = %.3f lbm\"%(mO)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Mass of oxygen added = 0.762 lbm\n" ] } ], "prompt_number": 1 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.2 pg : 262" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "n = 0.0714\n", "R = 1545.\n", "T = 560. \t\t\t#R\n", "P = 400. \t\t\t#psia\n", "VN = n*R*T/(P*144)\n", "VO = (0.0238)*R*T/(P*144)\n", "V = VN+VO\n", "\t\t\t\n", "# Results\n", "print \"Total volume = %.3f ft**3\"%(V)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Total volume = 1.430 ft**3\n" ] } ], "prompt_number": 2 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.3 pg : 265" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "import math \n", "m1 = 5.\n", "m2 = 2.\n", "cp1 = 0.248\n", "cp2 = 0.203\n", "T11 = 300. \t\t\t#F\n", "T12 = 100. \t\t\t#F\n", "P = 10. \t\t\t#psia\n", "Pi = 20. \t\t\t#psia\n", "Pf = 15. \t\t\t#psia\n", "\t\t\t\n", "# Calculations\n", "T2 = (m1*cp1*T11 + m2*cp2*T12)/(m1*cp1+m2*cp2)\n", "n1 = m1/28.\n", "n2 = m2/44.\n", "n = n1+n2\n", "P1 = P*n1/n\n", "P2 = P*n2/n\n", "dS = m2*(cp2*math.log((T2+460)/(T12+460)) - 35.1/778 *math.log(P2/Pi)) +m2*(cp2*math.log((T2+460)/(T12+460)) - 55.2/778 *math.log(P1/Pf))\n", "\t\t\t\n", "# Results\n", "print \"change in enthalpy = %.2f B/R\"%(dS)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "change in enthalpy = 0.49 B/R\n" ] } ], "prompt_number": 3 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.4 pg : 268" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "Pg = 2.8886 \t\t\t#psia\n", "P = 25. \t\t\t#psia\n", "phi = 0.5\n", "\t\t\t\n", "# Calculations\n", "pv = phi*Pg\n", "pa = P-pv\n", "w = 0.622*pv/pa\n", "x = (w)/(1+w)\n", "\t\t\t\n", "# Results\n", "print \"Mass fraction of water vapor in the mixture = %.4f lbm vapor/ lvm mixture\"%(x)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Mass fraction of water vapor in the mixture = 0.0367 lbm vapor/ lvm mixture\n" ] } ], "prompt_number": 4 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.5 pg : 271" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "pgw = 0.5069 \t\t\t#psia\n", "p = 14.696 \t\t\t#psia\n", "Td = 100. \t \t\t#F\n", "Tw = 80. \t\t\t#F\n", "\t\t\t\n", "# Calculations\n", "pv = pgw- (p-pgw)*(Td-Tw)/(2800-Tw)\n", "pg = 0.9492 \t\t\t#psia\n", "phi = pv/pg\n", "\t\t\t\n", "# Results\n", "print \"relative humidity of air stream = %.1f percent\"%(phi*100)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "relative humidity of air stream = 42.4 percent\n" ] } ], "prompt_number": 5 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.6 pg : 279" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "w1 = 0.0176 \t\t\t#lbm\n", "w2 = 0.0093 \t\t\t#lbm\n", "T2d = 73. \t\t\t#F\n", "T2 = 55. \t\t\t#F\n", "\t\t\t\n", "# Calculations\n", "hv1 = 1061+0.445*100\n", "hv2 = 1061+0.445*55\n", "hf = 23.06\n", "q1 = 20.\n", "q2 = 4.88\n", "\t\t\t\n", "# Results\n", "print \"Heat removed in cooling section = %d Btu/lbm \"%(q1)\n", "print \"Heat added in heating section = %.2f Btu/lbm \"%(q2)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "Heat removed in cooling section = 20 Btu/lbm \n", "Heat added in heating section = 4.88 Btu/lbm \n" ] } ], "prompt_number": 6 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.7 pg : 280" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "Tdb = 115. \t\t\t#F\n", "ph = 0.05\n", "\n", "Twb = 67. \t\t\t#F\n", "\t\t\t\n", "# Results\n", "print (\"From steam tables, Twb = 67 F\")\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "From steam tables, Twb = 67 F\n" ] } ], "prompt_number": 7 }, { "cell_type": "heading", "level": 2, "metadata": {}, "source": [ "Example 10.8 pg : 280" ] }, { "cell_type": "code", "collapsed": false, "input": [ "\t\t\t\n", "# Variables\n", "w1 = 206.\n", "w2 = 55.\n", "ma1 = 2.\n", "ma2 = 3.\n", "\t\t\t\n", "# Calculations\n", "w3 = (ma1*w1 + ma2*w2)/(ma1+ma2)\n", "Tdb3 = 82. \t\t\t#F\n", "TWb3 = 74.55 \t\t\t#F\n", "phi3 = 70. \t \t\t#percent\n", "\t\t\t\n", "# Results\n", "print \"relative humidity = %d percent\"%(phi3)\n", "print \" Dry bulb temperature = %d F\"%(Tdb3)\n", "print \" Wet bulb temperature = %.2f F\"%(TWb3)\n" ], "language": "python", "metadata": {}, "outputs": [ { "output_type": "stream", "stream": "stdout", "text": [ "relative humidity = 70 percent\n", " Dry bulb temperature = 82 F\n", " Wet bulb temperature = 74.55 F\n" ] } ], "prompt_number": 8 } ], "metadata": {} } ] }