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Diffstat (limited to 'Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_5.ipynb')
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diff --git a/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_5.ipynb b/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_5.ipynb new file mode 100755 index 00000000..ef287258 --- /dev/null +++ b/Mechanical_Engineering_Thermodynamics_by_Mooney_D_A/Chapter_5.ipynb @@ -0,0 +1,225 @@ +{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 5 - First Law of Thermodynamics"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 1 - Pg 59"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the change in internal energy\n",
+ "#initialization of varaibles\n",
+ "V1=10 #cu ft\n",
+ "P1=15 #psia\n",
+ "V2=5 #cu ft\n",
+ "H=34.7 #Btu\n",
+ "#calculations\n",
+ "W=P1*(V2-V1)*144\n",
+ "dE=-H-W/778.\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"Internal energy change =\",dE,\"Btu\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Internal energy change = -20.8 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2 - Pg 59"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the work done and the change in Internal energy\n",
+ "#initialization of varaibles\n",
+ "dT=35 #F\n",
+ "H=34 #Btu\n",
+ "cv=1.2 #B/lb F\n",
+ "m= 2 #lb\n",
+ "#calculations\n",
+ "U=cv*dT*m\n",
+ "W=H-U\n",
+ "#results\n",
+ "print '%s %d %s' %(\"Work done =\",W,\"Btu\")\n",
+ "print '%s %.1f %s' %(\"\\n Internal energy change =\",U,\"Btu\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Work done = -50 Btu\n",
+ "\n",
+ " Internal energy change = 84.0 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3 - Pg 60"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the change in internal energy in both cases\n",
+ "#initialization of varaibles\n",
+ "p=500 #psia\n",
+ "V2=0.9278 #cu ft\n",
+ "V1=0.0197 #cu ft\n",
+ "h2=1204.4 #B/lb\n",
+ "h1=449.4 #B/lb\n",
+ "#calculations\n",
+ "W=p*(V2-V1)*144.\n",
+ "du=h2-h1-144*p*(V2-V1)/778.\n",
+ "du2=h2-h1-W/778.\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"Change in internal energy = \",du,\"Btu\")\n",
+ "print '%s %.1f %s' %(\"\\n Method 2, Internal energy change = \",du2,\"Btu\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Change in internal energy = 671.0 Btu\n",
+ "\n",
+ " Method 2, Internal energy change = 671.0 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4a - Pg 61"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the heat liberated\n",
+ "#initialization of varaibles\n",
+ "import math\n",
+ "P1=75. #psia\n",
+ "P2=15. #psia\n",
+ "V1=6. #cu ft\n",
+ "g=1.2 #gamma\n",
+ "m=3. #lb\n",
+ "#calculations\n",
+ "V2=V1*math.pow((P1/P2),(1/g))\n",
+ "U=0.48*(P2*V2-P1*V1)\n",
+ "W=(P2*V2-P1*V1)*144./((1-g)*778.)\n",
+ "Q=U+W\n",
+ "#results\n",
+ "print '%s %.3f %s' %(\"Heat = \",Q,\"Btu\")\n",
+ "#The answer given in textbook is wrong. please check using a calculator\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Heat = 47.162 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4b - Pg 62"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the net work done\n",
+ "#initialization of varaibles\n",
+ "import math\n",
+ "P1=75. #psia\n",
+ "P2=15. #psia\n",
+ "V1=6. #cu ft\n",
+ "g=1.2 #gamma\n",
+ "m=3 #lb\n",
+ "#calculations\n",
+ "Q=30 #Btu\n",
+ "V2=V1*math.pow((P1/P2),(1/g))\n",
+ "U=0.48*(P2*V2-P1*V1)\n",
+ "W=Q-U\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"Work done =\",W,\" Btu\")\n",
+ "#The answer given in textbook is wrong. please check using a calculator\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Work done = 80.8 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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