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diff --git a/Thermodynamics_for_Engineers/Chapter_22_4.ipynb b/Thermodynamics_for_Engineers/Chapter_22_4.ipynb new file mode 100755 index 00000000..d43c8cae --- /dev/null +++ b/Thermodynamics_for_Engineers/Chapter_22_4.ipynb @@ -0,0 +1,333 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:4ce5546be38472485072968c27d4c6ae7f7b124c1af2a44e7388dbd36c855f4b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 22 - Refrigeration"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 1 - Pg 476"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the refrigerator and heat pump cp values in both cases\n",
+ "#Initalization of variables\n",
+ "t1=45+460. #R\n",
+ "th=70+460. #R\n",
+ "t2=-200+460. #R\n",
+ "th2=100+460. #R\n",
+ "#calculations\n",
+ "cp1=t1/(th-t1)\n",
+ "cp2=th/(th-t1)\n",
+ "cp3=t2/(th2-t2)\n",
+ "cp4=th2/(th2-t2)\n",
+ "#results\n",
+ "print '%s %.1f' %(\"In case 1, Refrigerator cp = \",cp1)\n",
+ "print '%s %.1f' %(\"\\n In case 1, Heat pump cp = \",cp2)\n",
+ "print '%s %.3f' %(\"\\n In case 2, Refrigerator cp = \",cp3)\n",
+ "print '%s %.3f' %(\"\\n In case 2, Heat pump cp = \",cp4)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "In case 1, Refrigerator cp = 20.2\n",
+ "\n",
+ " In case 1, Heat pump cp = 21.2\n",
+ "\n",
+ " In case 2, Refrigerator cp = 0.867\n",
+ "\n",
+ " In case 2, Heat pump cp = 1.867\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2 - Pg 479"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the coefficient of performance in wet and dry compression\n",
+ "#Initalization of variables\n",
+ "h3=85.282 #Btu/lb\n",
+ "s2=0.16392\n",
+ "sf=0.16798\n",
+ "#calculations\n",
+ "sfg=sf-0.023954\n",
+ "x3=-(s2-sf)/sfg\n",
+ "h2=78.335 - x3*67.651\n",
+ "h4=26.365 #Btu/lb\n",
+ "h1=h4\n",
+ "ref=h2-h1\n",
+ "work=h3-h2\n",
+ "cp1=ref/work\n",
+ "h2d=78.355\n",
+ "h1d=26.365 #Btu/lb\n",
+ "h3d=87.495 #Btu/lb\n",
+ "ref2=h2d-h1d\n",
+ "work2=h3d-h2d\n",
+ "cp2=ref2/work2\n",
+ "#results\n",
+ "print '%s %.3f' %(\"\\n Coefficient of performance in wet compression = \",cp1)\n",
+ "print '%s %.3f' %(\"\\n Coefficient of performance in dry compression = \",cp2)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Coefficient of performance in wet compression = 5.654\n",
+ "\n",
+ " Coefficient of performance in dry compression = 5.688\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 3 - Pg 480"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the tonnage value in both cases\n",
+ "#Initalization of variables\n",
+ "h1=24.973 #Btu/lb\n",
+ "h2=81.436 #Btu/lb\n",
+ "cfm=200 #cfm\n",
+ "v2=0.77357\n",
+ "v3=3.8750\n",
+ "h4=72.913\n",
+ "#calculations\n",
+ "mass=cfm/v2\n",
+ "ref=h2-h1\n",
+ "tonnage=mass*ref/cfm\n",
+ "mass2=cfm/v3\n",
+ "ref2=h4-h1\n",
+ "tonnage2=mass2*ref2/cfm\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"In case 1,Tonnage =\",tonnage,\" tons\")\n",
+ "print '%s %.2f %s' %(\"\\n In case 2,Tonnage =\",tonnage2,\" tons\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "In case 1,Tonnage = 73.0 tons\n",
+ "\n",
+ " In case 2,Tonnage = 12.37 tons\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 4 - Pg 481"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the refirgeration, shaft hp and cop\n",
+ "#Initalization of variables\n",
+ "h2d=93.410 #Btu/lb\n",
+ "h1=80.740 #Btu/lb\n",
+ "x=0.75\n",
+ "PD=160\n",
+ "vol=0.82\n",
+ "v1=1.7213\n",
+ "w2=80.156\n",
+ "w1=27.3\n",
+ "#calculations\n",
+ "twork=h2d-h1\n",
+ "swork=twork/x\n",
+ "flow=PD*vol/v1\n",
+ "ref=flow*(w2-w1)/200.\n",
+ "shp= flow*swork/42.4\n",
+ "cop=(w2-w1)/swork\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"Refrigeration =\",ref,\" tons\")\n",
+ "print '%s %.1f %s' %(\"\\n Shaft hp=\",shp,\" hp\")\n",
+ "print '%s %.2f' %(\"\\n Coefficient of performance = \",cop)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Refrigeration = 20.1 tons\n",
+ "\n",
+ " Shaft hp= 30.4 hp\n",
+ "\n",
+ " Coefficient of performance = 3.13\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 5 - Pg 488"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the cop\n",
+ "#Initalization of variables\n",
+ "mc=3000 #lb\n",
+ "hv=1080.2 #Btu/lb\n",
+ "hfe=26.06 #Btu/lb\n",
+ "hfp=10.05 #Btu/lb\n",
+ "x=0.7\n",
+ "#calculations\n",
+ "mv=(mc*hfp-mc*hfe)/(hfe-hv)\n",
+ "dh=145.4 #Btu/lb\n",
+ "chp=dh*mv/(x*42.4)\n",
+ "cop=mc*(hfe-hfp)/(chp*42.4)\n",
+ "#results\n",
+ "print '%s %.2f' %(\"Coefficient of performace = \",cop)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Coefficient of performace = 5.07\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 6 - Pg 493"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the power required\n",
+ "#Initalization of variables\n",
+ "loss=80000. #Btu/lb\n",
+ "t=560. #R\n",
+ "#calculations\n",
+ "ratio=t/68.\n",
+ "power=loss/(ratio*2544.)\n",
+ "#results\n",
+ "print '%s %.2f %s' %(\"Power = \",power,\" hp\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Power = 3.82 hp\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 7 - Pg 493"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate the power required\n",
+ "#Initalization of variables\n",
+ "loss=2*80000. #Btu/lb\n",
+ "tb=72. #F\n",
+ "to=12. #F\n",
+ "to2=42. #F\n",
+ "tf=104.+460 #R\n",
+ "#calculations\n",
+ "ratio=tf/(tf-460.)\n",
+ "power=loss/(2544.*ratio)\n",
+ "#results\n",
+ "print '%s %.1f %s' %(\"Power =\",power,\" hp\")\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Power = 11.6 hp\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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