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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:694b356fc4f85fd8aa841dd0d02eae327738df2eb161cb913631664ccceb9a07"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 4 : principles of energy analysis"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.1 pg : 79"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "m = 1.\n",
+ "he = 1148.8 \t\t\t#B/lbm\n",
+ "hi = 1357. \t\t\t#B/lbm\n",
+ "Ve = 100. \t\t\t#ft/sec\n",
+ "Vi = 800. \t\t\t#ft/sec\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "dW = m*(he-hi) + m*(Ve**2 - Vi**2)/(2*32.2*778)\n",
+ "dWhr = dW*3600\n",
+ "hp = -dWhr/2545.\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Horsepower output = %d hp\"%(hp+1)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Horsepower output = 313 hp\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.2 pg:79"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "rate = 80. \t\t\t#lbm/min\n",
+ "T1 = 100. \t\t\t#F\n",
+ "P1 = 100. \t\t\t#psia\n",
+ "P2 = 1000. \t\t\t#psia\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "v = 0.01613 \t\t\t#ft**3/lbm\n",
+ "W = rate*(P2-P1)*144*v\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Work done = %.2f ft-lbf/min\"%(round(W,-3))\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Work done = 167000.00 ft-lbf/min\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.3 pg : 81"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "hi = 1279.1 \t\t\t#B/lbm\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "u2 = hi\n",
+ "T2 = 564. \t\t\t#F\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Temperature of steam = %d F\"%(T2)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Temperature of steam = 564 F\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.4 pg : 82"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "import math \n",
+ "P1 = 20. \t\t\t#psia\n",
+ "P2 = 100. \t\t\t#psia\n",
+ "V = 3. \t \t\t#ft**3\n",
+ "T = 560. \t\t\t#R\n",
+ "ma = 0.289\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "ma = P1*V/(53.35*T)\n",
+ "Wa = -ma*53.35*T*math.log(P1/P2)\n",
+ "Qa = -Wa\n",
+ "Va2 = 3/5.\n",
+ "V2s = V-Va2\n",
+ "hi = 1279.1 \t\t\t#B/lbm\n",
+ "T2s = 536. \t\t\t#F\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Final temperature = %d F\"%(T2s)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Final temperature = 536 F\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.5 pg : 87"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "# Variables\n",
+ "P1 = 200. \t\t\t#psia\n",
+ "P2 = 100. \t\t\t#psia\n",
+ "T1 = 300.+460 \t\t\t#R\n",
+ "g = 1.4\n",
+ "cp = 0.24\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "T2 = (T1)*(P2/P1)**((g-1)/g)\n",
+ "V2 = math.sqrt(2*32.2*778*cp*(T1-T2))\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Final velocity = %d ft/sec\"%(V2)\n",
+ "\n",
+ "# check answer using calculator"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Final velocity = 1281 ft/sec\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.6 pg : 88"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "T1 = 500.+460 \t\t\t#R\n",
+ "P1 = 50. \t\t\t#psia\n",
+ "P2 = 15. \t\t\t#psia\n",
+ "g = 1.4\n",
+ "cp = 0.24\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "T2 = T1*(P2/P1)**((g-1)/g)\n",
+ "W = cp*(T2-T1) + (T1-460)**2 /(2*32.2*778)\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Net work output from turbine = %.1f B/lbm\"%(W)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Net work output from turbine = -62.1 B/lbm\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4.7 pg : 91"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\t\t\t\n",
+ "# Variables\n",
+ "T1 = 150.+460 \t\t\t#R\n",
+ "T1 = 40.+460 \t\t\t#R\n",
+ "\t\t\t\n",
+ "# Calculations\n",
+ "h2 = 43.850 \t\t\t#B/lbm\n",
+ "hf2 = 17.273\n",
+ "hfg2 = 64.163\n",
+ "x2 = (h2-hf2)/hfg2\n",
+ "\t\t\t\n",
+ "# Results\n",
+ "print \"Quality of freon vapor = %.3f\"%(x2)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Quality of freon vapor = 0.414\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 08:28:22 +0000