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Diffstat (limited to 'Thermodynamics_by_J._P._Holman/ch6_1.ipynb')
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diff --git a/Thermodynamics_by_J._P._Holman/ch6_1.ipynb b/Thermodynamics_by_J._P._Holman/ch6_1.ipynb new file mode 100755 index 00000000..489db493 --- /dev/null +++ b/Thermodynamics_by_J._P._Holman/ch6_1.ipynb @@ -0,0 +1,263 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:8b62be1f41dd311c1ab38e8f1f5050fc85b3e25eb123d081120fb3bbfeaaa74a" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 6 :\n", + "The second law of\n", + "thermodynamics" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.1 pg : 140" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\t\t\t\n", + "# Variables\n", + "m = 5. \t \t \t#lbm\n", + "P = 50. \t \t\t#psia\n", + "T = 500. + 460 \t\t\t#R\n", + "\t\t\t\n", + "# Calculations\n", + "s1 = 0.4110 \t\t\t#B/lbm R\n", + "s2 = 1.7887 \t\t\t#B/lbm R\n", + "dS = m*(s2-s1)\n", + "\t\t\t\n", + "# Results\n", + "print \"Change in entropy = %.3f B/R\"%(dS)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Change in entropy = 6.888 B/R\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.2 pg : 140" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\t\t\t\n", + "# Variables\n", + "P = 20. \t\t\t#psia\n", + "T = 227.96+ 459.69 \t\t\t#R\n", + "\t\t\t\n", + "# Calculations\n", + "sfg = 1.3962 \t\t\t#B/ R lbm\n", + "Q = T*sfg\n", + "\t\t\t\n", + "# Results\n", + "print \"heat transfer = %.1f B/lbm\"%(Q)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "heat transfer = 960.1 B/lbm\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.3 pg : 141" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math \n", + "\t\t\t\n", + "# Variables\n", + "T1 = 100.+460 \t\t\t#R\n", + "P1 = 15. \t\t\t#psia\n", + "P2 = 50. \t \t\t#psia\n", + "n = 1.3\n", + "cp = 0.24\n", + "\t\t\t\n", + "# Calculations\n", + "T2 = T1*(P2/P1)**((n-1)/n)\n", + "dS = cp*math.log(T2/T1) - 53.35/778 *math.log(P2/P1) \n", + "\t\t\t\n", + "# Results\n", + "print \"Change in entropy = %.3f B/lbm R\"%(dS)\n", + "\t\t\t#the answer given in textbook is wrong. Please check it using a calculator\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Change in entropy = -0.016 B/lbm R\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.4 pg : 141" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math \n", + "\t\t\t\n", + "# Variables\n", + "T1 = 85.+460 \t\t\t#R\n", + "T2 = T1\n", + "cp = 0.24\n", + "P2 = 15. \t\t\t#psia\n", + "P1 = 30. \t\t\t#psia\n", + "\t\t\t\n", + "# Calculations\n", + "dS = cp*math.log(T2/T1) - 53.35/778 *math.log(P2/P1)\n", + "\t\t\t\n", + "# Results\n", + "print \"Change in entropy = %.4f B/lbm R\"%(dS)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Change in entropy = 0.0475 B/lbm R\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.5 pg : 142" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\t\t\t\n", + "# Variables\n", + "Qh = -1000. \t\t\t#Btu\n", + "Ql = 1000. \t\t\t#Btu\n", + "Th = 1460. \t \t\t#R\n", + "Tl = 960. \t\t \t#R\n", + "\t\t\t\n", + "# Calculations\n", + "Sh = Qh/Th\n", + "Sl = Ql/Tl\n", + "S = Sh+Sl\n", + "\t\t\t\n", + "# Results\n", + "print \"Change in entropy of the universe = %.3f B/R\"%(S)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Change in entropy of the universe = 0.357 B/R\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 6.6 pg : 143" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\t\t\t\n", + "# Variables\n", + "h1 = 1416.4 \t\t\t#B/lbm\n", + "s1 = 1.6842 \t\t\t#B/lbm R\n", + "\t\t\t\n", + "# Calculations\n", + "s2 = s1\n", + "P2 = 50. \t\t\t#psia\n", + "T2 = 317.5 \t\t\t#F\n", + "h2 = 1193.7\n", + "W = h2-h1\n", + "\t\t\t\n", + "# Results\n", + "print \"Work calculated = %.1f B/lbm\"%(W)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Work calculated = -222.7 B/lbm\n" + ] + } + ], + "prompt_number": 7 + } + ], + "metadata": {} + } + ] +}
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