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-{
- "metadata": {
- "name": "",
- "signature": "sha256:910acb7ed7ee37a2d5b97a6f5e2b66763e4dc01353e87c18f37d153efde41037"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter 4: The First Law of Thermodynamics"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.1, page no. 55"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "m = 0.5 #mass rate of flow(lbm/sec)\n",
- "Pi = 14.0 #inlet pressure(lb/in^2)\n",
- "SVi = 13.0 #inlet specific volume(ft^3/lbm)\n",
- "Vi = 100.0 #inlet velocity(ft/sec)\n",
- "P = 75.5 #power input(hp)\n",
- "Hr = 8.65 #heat rejected(zB/sec)\n",
- "Pd = 150.0 #discharge pressure(lb/in^2)\n",
- "SVd = 2.1 #discharge specific volume(ft^3/lb)\n",
- "Vd = 200.0 #discharge velocity(ft/sec)\n",
- "z1 = 3.0 #distance(ft)\n",
- "z2 = 10.0 #distance(ft)\n",
- "\n",
- "#calculation\n",
- "WbyJ=P*550/(m*778)\n",
- "Q=Hr/m\n",
- "Wi=144*Pi*SVi/(778)\n",
- "Wo=144*Pd*SVd/(778)\n",
- "PEi=z1/778\n",
- "PEf=z2/778\n",
- "KEi=Vi**2 /(2*32.2*778)\n",
- "KEf=Vd**2 /(2*32.2*778)\n",
- "du=-Q+WbyJ+PEi-PEf+KEi-KEf+Wi-Wo\n",
- "\n",
- "#result\n",
- "print \"Increase in internal energy = \", round(du,1) ,\"B/lbm\" "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Increase in internal energy = 64.2 B/lbm\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.2, page no. 57"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "d = 500.0 #depth of well(ft)\n",
- "Pi = 14.0 #pump inlet pressure(lb/in^2)\n",
- "Pd = 15.0 #discharge pressure(lb/in^2)\n",
- "Sv = 0.016 #specific volume of water(ft^3 /lb)\n",
- "\n",
- "#calculation\n",
- "Wi = 144*Pi*Sv\n",
- "Wf = 144*Pd*Sv\n",
- "PEi = 0\n",
- "PEf = d\n",
- "Winput = Wf-Wi+PEf-PEi\n",
- "\n",
- "#result\n",
- "print \"Input work = \", round(Winput, 1), \"ft-lb/lbm\"\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Input work = 502.3 ft-lb/lbm\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.3, page no. 61"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "T1 = 70 #temperature(F)\n",
- "T2 = 140 #temperature(F)\n",
- "m = 10 #mass of water(lb)\n",
- "Cp = 1 #specific volume for water(B/lbm F)\n",
- "\n",
- "#calculation\n",
- "Q = Cp*(T2-T1)\n",
- "Qdot = m*Q\n",
- "w = 0 #since no change in pressure\n",
- "\n",
- "#result\n",
- "print \"Work done = \", w\n",
- "print \"Change in enthalpy= \", Qdot, \"B\"\n",
- "print \"Heat added per pound = \", Q, \"B/lbm\"\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Work done = 0\n",
- "Change in enthalpy= 700 B\n",
- "Heat added per pound = 70 B/lbm\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.4, page no. 63"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "W = 64000.0 #ft-lbm/lb\n",
- "P = 14.0 #pressure(lb/in^2)\n",
- "W2 = 48500.0 #work input(ft-lbm/lb)\n",
- "\n",
- "#calculation\n",
- "dh1 = W/778.0\n",
- "dh2 = W2/778.0\n",
- "\n",
- "#result\n",
- "print \"For the actual process = %.1f B/lbm\" %dh1\n",
- "print \"For the frictionless process = \", round(dh2, 1), \"B/lbm\"\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "For the actual process = 82.3 B/lbm\n",
- "For the frictionless process = 62.3 B/lbm\n"
- ]
- }
- ],
- "prompt_number": 12
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.5, page no. 66"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "import math\n",
- "\n",
- "#initilisation\n",
- "ht = 308 #B/lbm\n",
- "h = 298 #B/lbm\n",
- "\n",
- "#calculation\n",
- "V = math.sqrt(2*32.2*778*(ht-h))\n",
- "\n",
- "#result\n",
- "print \"Velocity of tha gas= %d ft/sec\" %V"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Velocity of tha gas= 707 ft/sec\n"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.6, page no. 69"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "hp = 10000 #hp\n",
- "v = 100.0 #lbm/sec\n",
- "\n",
- "#calculation\n",
- "W = hp*550/v\n",
- "enthalpy = W/778.0\n",
- "\n",
- "#result\n",
- "print \"Decrease in stagnation enthalpy= %.1f B/lbm\" %enthalpy"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Decrease in stagnation enthalpy= 70.7 B/lbm\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.7, page no. 69"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "\n",
- "w1 = 100 #lbm\n",
- "w2 = 2 #lbm\n",
- "h1 = 127 #B/lbm\n",
- "h2 = 125 #B/lbm\n",
- "hc = 401 #B/lbm\n",
- "\n",
- "#calculation\n",
- "ht1=w1*h1\n",
- "ht2=w2*h2\n",
- "ht3=(w1+w2)*hc\n",
- "Q=ht3-ht1-ht2\n",
- "\n",
- "#result\n",
- "print \"Heat liberated = %d B/sec\" %Q"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Heat liberated = 27952 B/sec\n"
- ]
- }
- ],
- "prompt_number": 13
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.8, page no. 72"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "\n",
- "du=75 #B/lbm\n",
- "m=0.01 #lbm\n",
- "\n",
- "#calculation\n",
- "W=778*du\n",
- "Wdot=m*W\n",
- "\n",
- "#result\n",
- "print \"Work for the process = %d ft-lb\" %Wdot"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Work for the process = 583 ft-lb\n"
- ]
- }
- ],
- "prompt_number": 14
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4.9, page no. 72"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "#initilisation\n",
- "m = 0.5 #lbm\n",
- "\n",
- "#calculation\n",
- "#From tables\n",
- "h1 = 48.02 #B/lbm\n",
- "hf = 180.07 #B/lbm\n",
- "hfg = 970.3 #B/lbm\n",
- "h2 = hf+m*hfg\n",
- "Q = h2-h1\n",
- "\n",
- "#result\n",
- "print \"Heat added = %.1f B\" %Q"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Heat added = 617.2 B\n"
- ]
- }
- ],
- "prompt_number": 15
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-20 17:55:54 +0000