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diff --git a/Thermal_Engineering_by_S._l._Somasundaram/Ch8.ipynb b/Thermal_Engineering_by_S._l._Somasundaram/Ch8.ipynb new file mode 100644 index 00000000..3394b0d7 --- /dev/null +++ b/Thermal_Engineering_by_S._l._Somasundaram/Ch8.ipynb @@ -0,0 +1,862 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:42e2ded71019e096fa78e5ec8ee8970ec5e9f7c3ad7b071fbd97280ef33b24b4" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Ch-8 : Refrigeration" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.1 : Pg - 325" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "cc=12000 #btu/h\n", + "pi=1565 #/watts\n", + "ra=7 #btu/h/w\n", + "#CALCULATIONS\n", + "EER=cc/pi\n", + "p1=cc/ra\n", + "#RESULTS\n", + "print 'EER is %0.2f '%(EER)\n", + "print '\\npower consumption of first unit is %0.2f Watts'%(p1)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "EER is 7.00 \n", + "\n", + "power consumption of first unit is 1714.00 Watts\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.2 : Pg - 327" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "t1=278 #temparature in k\n", + "t2=300 #temparature in k\n", + "hf2=21 #kj/kg\n", + "hfg2=2489.7 #kj/kg\n", + "h3=113.1 #under 300 k in kj/kg\n", + "x2=0.8\n", + "p=3.154 #power\n", + "#CALCULATIONS\n", + "cop=t1/(t2-t1)\n", + "h2=hf2+(x2*hfg2)\n", + "re=h2-h3\n", + "pr=p/cop\n", + "#RESULTS\n", + "print 'cop is %0.2f '%(cop)\n", + "print '\\npower required is %0.4f kw/ton of refrigeration'%(pr)\n", + "print '\\nrefrigeration effect is %0.1f kJ/kg'%(re)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "cop is 12.00 \n", + "\n", + "power required is 0.2628 kw/ton of refrigeration\n", + "\n", + "refrigeration effect is 1899.7 kJ/kg\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.3 : Pg - 330" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "t1=253 #temp in k\n", + "t3=313 #temp in k\n", + "cp=1.005 #kj/kg\n", + "r=4 #bar\n", + "g=1.4\n", + "#CALCULATIONS\n", + "t2=(t1*(r)**((g-1)/g))\n", + "t4=(t3/(r)**((g-1)/g))\n", + "re=cp*(t1-t4)\n", + "wi=cp*((t2-t3)-(t1-t4))\n", + "cop=re/wi\n", + "ma=(3.5164*10)/re\n", + "p=ma*wi\n", + "#RESULTS\n", + "print 'cop is %0.2f '%(cop)\n", + "print '\\nmass of refrigeration is %0.3f kg/s'%(ma)\n", + "print '\\npower required to drive the unit is %0.1f kW'%(p)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "cop is 2.06 \n", + "\n", + "mass of refrigeration is 0.826 kg/s\n", + "\n", + "power required to drive the unit is 17.1 kW\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.4 : Pg - 330" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "t1=261 #temp in k\n", + "t3=310 #temp in k\n", + "cp=1.005 #kj/kg\n", + "r=5\n", + "#CALCULATIONS\n", + "t2=(t1*(r)**((g-1)/g))\n", + "t4=(t3/(r)**((g-1)/g))\n", + "re=cp*(t1-t4)\n", + "ma=(3.5164*3600)/re\n", + "woc=cp*(t2-t1)\n", + "woe=cp*(t3-t4)\n", + "nw=woc-woe\n", + "cop1=re/nw\n", + "cop2=t1/(t3-t1)\n", + "reff=cop1/cop2\n", + "#RESULTS\n", + "print 'temparature at states 2 and 4 are %0.1f k and %0.1f k'%(t2,t4)\n", + "print '\\nmass of air per hour is %0.2f kg/h'%(ma)\n", + "print '\\nnet work required is %0.2f kJ/kg'%(nw)\n", + "print '\\ncoefficient of perfoemance is %0.3f '%(cop1)\n", + "print '\\nrelative efficiency is %0.4f '%(reff)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "temparature at states 2 and 4 are 413.4 k and 195.7 k\n", + "\n", + "mass of air per hour is 192.98 kg/h\n", + "\n", + "net work required is 38.30 kJ/kg\n", + "\n", + "coefficient of perfoemance is 1.713 \n", + "\n", + "relative efficiency is 0.3426 \n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.5 : Pg - 334" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=176.48 #under -25 degrees temp in kj/kg\n", + "s1=0.7127 #under -25 degrees temp in kj/kgk\n", + "h2=215.17 #under 58 degrees temp in kj/kg\n", + "h3=79.71 #under 45 degrees temp in kj/kg\n", + "h4=79.71 #under 45 degrees temp in kj/kg\n", + "no=20 # number of tons\n", + "#CALCULATIONS\n", + "w=h2-h1\n", + "re=h1-h4\n", + "cop=re/w\n", + "ha=no*3.5164\n", + "cr=ha/re\n", + "pr=cr*w\n", + "#RESULTS\n", + "print 'the refrigeration effect is %0.2f kJ/kg'%(re)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)\n", + "print '\\npower required is %0.2f kw'%(pr)\n", + "print '\\ncirculating rate of refrigerant is %0.3f kg/s'%(cr)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "the refrigeration effect is 96.77 kJ/kg\n", + "\n", + "coefficient of performance is 2.50 \n", + "\n", + "power required is 28.12 kw\n", + "\n", + "circulating rate of refrigerant is 0.727 kg/s\n" + ] + } + ], + "prompt_number": 7 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.6 : Pg - 335" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=176.48 #under -25 degrees temp in kj/kg\n", + "h2=215.17 #kj/kg\n", + "h4=74.59 #kj/kg\n", + "#CALCULATIONS\n", + "re=h1-h4\n", + "w=h2-h1\n", + "cop=re/w\n", + "#RESULTS\n", + "print 'the refrigeration effect is %0.2f kj/kg'%(re)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "the refrigeration effect is 101.89 kj/kg\n", + "\n", + "coefficient of performance is 2.63 \n" + ] + } + ], + "prompt_number": 8 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.7 : Pg - 335" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=179.43 #under -25 degrees temp in kj/kg\n", + "h2=219.03 #kj/kg\n", + "h4=74.59 #kj/kg\n", + "#CALCULATIONS\n", + "re=h1-h4\n", + "w=h2-h1\n", + "cop=re/w\n", + "#RESULTS\n", + "print 'the refrigeration effect is %0.2f kJ/kg'%(re)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "the refrigeration effect is 104.84 kJ/kg\n", + "\n", + "coefficient of performance is 2.65 \n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.8 : Pg - 336" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h2=1472.6 #kj/kg\n", + "s2=4.898 #kj/kgk\n", + "sf1=0.510 #kj/kgk\n", + "sfg1=5.504 #kj/kgk\n", + "hf1=126.2 #kj/kg\n", + "hfg1=1304.3 #kj/kg\n", + "h4=362.1 #under 38 degrees in kj/kg\n", + "h2=1472.6 #kj/kg\n", + "h3=362.1 #under 38 degrees in kj/kg\n", + "t1=261 #temp in k\n", + "t2=311 #temp in k\n", + "#CALCULATIONS\n", + "x1=(s2-sf1)/sfg1\n", + "h1=hf1+(x1*hfg1)\n", + "re=h1-h4\n", + "w=h2-h1\n", + "cop=re/w\n", + "hr=h2-h3\n", + "ca=(2*re*50)/(3600*3.5164)\n", + "pom=100*w/3600\n", + "ccop=t1/(t2-t1)\n", + "rff=cop/ccop\n", + "#RESULTS\n", + "print 'coefficient of performance is %0.2f '%(cop)\n", + "print '\\nheat rejected in the condenser is %0.2f kJ/kg'%(hr)\n", + "print '\\nrefrigerating effect is %0.1f kJ/kg'%(re)\n", + "print '\\ncapacity of motor is %0.2f rons of refrigeration'%(ca)\n", + "print '\\npower of motor is %0.2f kw'%(pom)\n", + "print '\\nrefrigerating befficiency is %0.3f '%(rff)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "coefficient of performance is 2.62 \n", + "\n", + "heat rejected in the condenser is 1110.50 kJ/kg\n", + "\n", + "refrigerating effect is 803.9 kJ/kg\n", + "\n", + "capacity of motor is 6.35 rons of refrigeration\n", + "\n", + "power of motor is 8.52 kw\n", + "\n", + "refrigerating befficiency is 0.524 \n" + ] + } + ], + "prompt_number": 10 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.9 : Pg - 337" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "hf1=-7.53 #kj/kg\n", + "hfg1=245.8 #kj/kg\n", + "x1=0.6\n", + "sf1=-0.04187 #kj/kgk\n", + "t1=268 #temp in degrees\n", + "sf2=0.2513 #kj/kgk\n", + "hf2=81.25 #kj/kg\n", + "hfg2=121.5 #kj/kg\n", + "t2=298 #temp in k\n", + "h4=81.25 #under 20 degrees in kj/kg\n", + "h3=81.25 #under 20 degrees in kj/kg\n", + "sh=4.2 #kj/kgk\n", + "lt=335 #kj/kg\n", + "reff=0.5\n", + "sfg1= 1 #kj/kg\n", + "s2= 1 #kj/kg\n", + "#CALCULATIONS\n", + "h1=hf1+(x1*hfg1)\n", + "s1=sf1+(x1*sfg1)\n", + "x2=((s2-sf2)/hfg2)*t2\n", + "h2=hf2+(x2*hfg2)\n", + "re=h1-h4\n", + "are=re*reff\n", + "he=sh*10+lt\n", + "ma=(are*6*60)/he\n", + "#RESULTS\n", + "print 'refrigerating effect is %0.2f kJ/kg'%(re)\n", + "print '\\nactual refrigerating effect is %0.2f kJ/kg'%(are)\n", + "print '\\nheat to be extracted to produce 1kg of ice is %0.2f kJ/kg of ice'%(he)\n", + "print '\\nmass of ice formed is %0.2f kg/day'%(ma)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "refrigerating effect is 58.70 kJ/kg\n", + "\n", + "actual refrigerating effect is 29.35 kJ/kg\n", + "\n", + "heat to be extracted to produce 1kg of ice is 377.00 kJ/kg of ice\n", + "\n", + "mass of ice formed is 28.03 kg/day\n" + ] + } + ], + "prompt_number": 11 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.10 : Pg - 340" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ph=13.89 #pressure in bar under 36 degrees temp\n", + "p1=1.447 #pressure in bar under -26 degrees temp\n", + "h1=1411.4 #kj/kg\n", + "s1=5.718 #kj/kgk\n", + "h2=1561.7 #kj/kg\n", + "h3= 150 #kj/kg\n", + "h4=185.8 #kj/kg\n", + "h5=1445.5 #kj/kg\n", + "s5=5.327 #kj/kgk\n", + "s5=5.327 #kj/kgk\n", + "h6=1607.6 #kj/kg\n", + "r=25\n", + "#CALCULATIONS\n", + "pi=(p1*ph)**0.5\n", + "m1=(3.5164*r)/(h1-h4)\n", + "mh=m1*(h2-h3)/(h5-h1)\n", + "poc=m1*(h2-h1)\n", + "pohc=mh*(h6-h5)\n", + "pr=poc+pohc\n", + "re=h1-h4\n", + "wi=(h2-h1)+(h6-h5)\n", + "cop=re/wi\n", + "#RESULTS\n", + "# ans in the book is wrong.\n", + "print 'power of lp compressor is %0.2f kW'%(poc)\n", + "print '\\npower of hp compressor is %0.2f kW'%(pohc)\n", + "print '\\ntotal power required is %0.2f kW'%(pr)\n", + "print '\\nrefrigerating effect is %0.2f kJ/kg'%(re)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "power of lp compressor is 10.78 kW\n", + "\n", + "power of hp compressor is 481.35 kW\n", + "\n", + "total power required is 492.13 kW\n", + "\n", + "refrigerating effect is 1225.60 kJ/kg\n", + "\n", + "coefficient of performance is 3.92 \n" + ] + } + ], + "prompt_number": 12 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.11 : Pg - 341" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=1411.4 #kj/kg\n", + "s1=5.718 #kj/kgk\n", + "s2=5.718 #kj/kgk\n", + "h2=1755.7 #kj/kg\n", + "h4=352.3 #under 13.89 bar in kj/kg\n", + "h3=352.3 #under 13.89 bar in kj/kg \n", + "#CALCULATIONS\n", + "m=(3.5164*25)/(h1-h4)\n", + "poc=m*(h2-h1)\n", + "cop=(h1-h4)/(h2-h1)\n", + "#RESULTS\n", + "print 'mass flow rate of refrigerant is %0.3f kg/s'%(m)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)\n", + "print '\\npower of compressor is %0.2f kW'%(poc)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "mass flow rate of refrigerant is 0.083 kg/s\n", + "\n", + "coefficient of performance is 3.08 \n", + "\n", + "power of compressor is 28.58 kW\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.12 : Pg - 342" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=178.73 #under -20 degrees in kj/kg\n", + "h5=185.66 #under 5 degrees in kj/kg\n", + "h3=79.71 #under 10.84 degrees in kj/kg\n", + "h6=79.71 #under 10.84 degrees in kj/kg\n", + "h4=79.71 #under 10.84 degrees in kj/kg\n", + "h2=219.33 #kj/kg\n", + "#CALCULATIONS\n", + "m1=(7*211)/(h1-h4)\n", + "mh=(5*211)/(h5-h4)\n", + "h8=((m1*h1)+(mh*h5))/(m1+mh)\n", + "poc=(m1+mh)*(h2-h8)\n", + "cop=(12*211)/poc\n", + "#RESULTS\n", + "# ans in the book is wrong.\n", + "print 'power of compressor is %0.2f kJ/min'%(poc)\n", + "print '\\nrefrigerant flow rate is %0.2f kg/min'%(mh)\n", + "print '\\ncoefficient of performance is %0.2f '%(cop)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "power of compressor is 940.87 kJ/min\n", + "\n", + "refrigerant flow rate is 9.96 kg/min\n", + "\n", + "coefficient of performance is 2.69 \n" + ] + } + ], + "prompt_number": 14 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.13 : Pg - 344" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=185.38 #under -5 degrees temp in kj/kg\n", + "s1=0.6991 #nder -5 degrees temp in kj/kgk\n", + "ps2=7.449 #under 30 degrees in bar\n", + "s2=0.6991 #under 30 degrees in bar\n", + "h2=203.9 #kj/kg\n", + "h3=64.59 #kj/kg\n", + "h4=64.59 #kj/kg\n", + "#CALCULATIONS\n", + "he=h2-h3\n", + "wi=h2-h1\n", + "cop1=he/wi\n", + "mf=84400/he\n", + "pr=(mf/3600)*(wi)\n", + "coe=pr*1\n", + "#RESULTS\n", + "print 'coefficient of performance is %0.3f '%(cop1)\n", + "print '\\nmass flow rate of refrigerant is %0.2f kg/h'%(mf)\n", + "print '\\npower required is %0.2f kw'%(pr)\n", + "print '\\ncost of electricity is %0.2f rs'%(coe)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "coefficient of performance is 7.522 \n", + "\n", + "mass flow rate of refrigerant is 605.84 kg/h\n", + "\n", + "power required is 3.12 kw\n", + "\n", + "cost of electricity is 3.12 rs\n" + ] + } + ], + "prompt_number": 15 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.14 : Pg - 356" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "#initialisation of variables\n", + "TH = 120+273 # K\n", + "TL = 6+273 # K\n", + "Ta = 21+273 # K\n", + "eff = 14/100.0\n", + "#CALCULATIONS\n", + "cop1 = (TL/(Ta-TL))*(TH-Ta)/TH\n", + "cop2 = eff*cop1\n", + "#RESULTS\n", + "print '\\nCOP of reversible cycle is %0.2f '%(cop1)\n", + "print '\\nCOP of actual cycle is %0.2f '%(cop2)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "\n", + "COP of reversible cycle is 4.69 \n", + "\n", + "COP of actual cycle is 0.66 \n" + ] + } + ], + "prompt_number": 16 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.15 : Pg - 359" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps2=0.008129 #under 4 degree temp in bar\n", + "ps3=0.047534 #under32 degree temp in bar\n", + "v=0.75 #volume in m*m*m\n", + "vf=0.001\n", + "h1=50.4 #under 12 degree temp in kj/kg\n", + "h2=16.8 #kj/kg\n", + "hf3=16.8 #kj/kg\n", + "hfg3=2492.1 #kj/kg\n", + "x3=0.98\n", + "vg3=157.27 #under 4 degree temparature\n", + "#CALCULATIONS\n", + "pr=ps3/ps2\n", + "mfr=v/vf\n", + "re=mfr*(h1-h2)\n", + "h3=hf3+(x3*hfg3)\n", + "mf3=re/(h3-h1)\n", + "vv=mf3*x3*vg3\n", + "#RESULTS\n", + "print 'pressures in flash chamber are ps2=0.008129 and ps3=0.047534'\n", + "print '\\npressure ratio is %0.2f '%(pr)\n", + "print '\\nthe refrigeration effect is %0.2f kJ/kg'%(re)\n", + "print '\\namount of makeup water is %0.3f kg/min'%(mf3)\n", + "print '\\nvolume of water entering the ejector is %0.1f m*m*m/min'%(vv)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "pressures in flash chamber are ps2=0.008129 and ps3=0.047534\n", + "\n", + "pressure ratio is 5.85 \n", + "\n", + "the refrigeration effect is 25200.00 kJ/kg\n", + "\n", + "amount of makeup water is 10.462 kg/min\n", + "\n", + "volume of water entering the ejector is 1612.5 m*m*m/min\n" + ] + } + ], + "prompt_number": 17 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.16 : Pg - 362" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "h1=272.763 #under 300 k temp in kj/kg\n", + "s1=6.4125 #under 300 k temp in kj/kg\n", + "h2=230.347 #under 200 k temp in kj/kg1\n", + "s2=4.9216 #under 300 k temp in kj/kg\n", + "hf=-133.347 #kj/kg\n", + "t1=300 #temp in k\n", + "#CALCULATIONS\n", + "y=(h1-h2)/(h1-hf)\n", + "mw=(t1*(s2-s1))-(h2-h1)\n", + "x=mw/0.1044\n", + "#RESULTS\n", + "print 'fraction of oxygen condensed is %0.4f '%(y)\n", + "print '\\nwork required is %0.2f '%(x) #answer is wrong in tb" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "fraction of oxygen condensed is 0.1044 \n", + "\n", + "work required is -3877.91 \n" + ] + } + ], + "prompt_number": 18 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 8.19 : Pg - 364" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "t1=300 #temp in k\n", + "sf=2.9409 #kj/kgk\n", + "s1=6.44125 #kj/kgk\n", + "hf=-133.347 #kj/kg\n", + "h1=272.763 #kj/kg\n", + "w=-4690.5\n", + "#CALCULATIONS\n", + "mw=(t1*(sf-s1)-(hf-h1))\n", + "fom=mw/w\n", + "#RESULTS\n", + "print 'minimum work is %0.2f kJ/kg of o2 liquefied'%(mw)\n", + "print '\\nfigure of merit is %0.4f '%(fom)\n", + "#ans wrong in the book." + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "minimum work is -644.00 kJ/kg of o2 liquefied\n", + "\n", + "figure of merit is 0.1373 \n" + ] + } + ], + "prompt_number": 19 + } + ], + "metadata": {} + } + ] +}
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