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diff --git a/Thermal_Engineering_by_S._l._Somasundaram/Ch7.ipynb b/Thermal_Engineering_by_S._l._Somasundaram/Ch7.ipynb new file mode 100644 index 00000000..358ceb39 --- /dev/null +++ b/Thermal_Engineering_by_S._l._Somasundaram/Ch7.ipynb @@ -0,0 +1,920 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:9acdea47ca7898eae442036130d51b232205190e82c14f3cc5e8b20a00e6edad" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Ch-7 : Psychrometrics " + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.1 : Pg - 290" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps=0.024853 #at 21 degress \n", + "phi=0.34 #relative humidity\n", + "p=1.013 #pressure in bar\n", + "#CALCULATIONS\n", + "pv=ps*phi\n", + "w=0.622*(pv/(p-pv))\n", + "tdew=4.5 #at 0.00845 bar\n", + "#RESULTS\n", + "print 'specific humidity is %0.5f kg/kg of da'%(w)\n", + "print 'dew point temp is %0.2f degree C'%(tdew)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "specific humidity is 0.00523 kg/kg of da\n", + "dew point temp is 4.50 degree C\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.2 : Pg - 291" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "t1=26 #temp in degrees\n", + "t2=32 #temp in degrees\n", + "pvs=0.033597 #pressure in bar\n", + "ps=0.047534 #pressure in bar\n", + "p=1.013 #pressure in bar\n", + "a=6.6*10**-4\n", + "#CALCULATIONS\n", + "pv=pvs-(p*a*(t2-t1))\n", + "w=(0.622*pv)/(p-pv)\n", + "phi=pv/ps\n", + "#RESULTS\n", + "print 'specific humidity is %0.4f kg/kg of da'%(w)\n", + "print '\\nrelative humidity is %0.3f '%(phi)\n", + "print 'dew point temp is 23.5 degree C' #from steam tables" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "specific humidity is 0.0187 kg/kg of da\n", + "\n", + "relative humidity is 0.622 \n", + "dew point temp is 23.5 degree C\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.3 : Pg - 291" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps=0.042415 #under 30 degrees temp in bar\n", + "vg=32.929 #m*m*m/kg\n", + "phi=0.3 #relative humidity\n", + "p=1.01325 #bar\n", + "pv=0.012725**10**2 #pressure \n", + "rv=0.4615\n", + "t=313 #temp in k\n", + "pa=1.005*10**2\n", + "ra=0.287\n", + "#CALCULATIONS\n", + "pv=phi*ps\n", + "w1=0.622*(pv/(p-pv))\n", + "rhos=1/vg\n", + "rhov=phi*rhos\n", + "rho=pv/(rv*t)\n", + "pa=p-pv\n", + "rhoa=pa*100/(ra*t)\n", + "w2=rhov/rhoa\n", + "ds=phi*((p-ps)/(p-pv))\n", + "#RESULTS\n", + "print 'partial pressure of water vapour is %0.6f bar'%(pv)\n", + "print '\\ndensity of dry air is %0.4f kg/m*m*m'%(rhoa)\n", + "print 'dew point temp is 10.5 degrees'\n", + "print '\\nspecific humidity is %0.5f kg/kg of da'%(w2) #textbook answer slightly varies\n", + "print '\\ndegree of saturation is %0.4f '%(ds)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "partial pressure of water vapour is 0.012724 bar\n", + "\n", + "density of dry air is 1.1138 kg/m*m*m\n", + "dew point temp is 10.5 degrees\n", + "\n", + "specific humidity is 0.00818 kg/kg of da\n", + "\n", + "degree of saturation is 0.2911 \n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.4 : Pg - 292" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps=0.035636 #pressure in bar\n", + "pvw=0.018168 #pressure in bar\n", + "p=1.01325 #pressure in bar\n", + "a=6.6*10**-4\n", + "w=0.00667\n", + "td=27 #temparature in degrees\n", + "tw=16 #temparature in degrees\n", + "#CALCULATIONS\n", + "pv=pvw-(p*a*(td-tw))\n", + "w=0.622*(pv/(p-pv))\n", + "phi=pv/ps\n", + "h=(1.005*td+w*(2500+1.86*td))\n", + "#RESULTS\n", + "print 'humidity ratio is %0.5f kg/kg of da'%(w)\n", + "print '\\nrelative humidity is %0.4f '%(phi)\n", + "print 'dew point temparature is 8 degrees'\n", + "print '\\nenthalphy of moist air is %0.2f kg/kg of da'%(h)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "humidity ratio is 0.00671 kg/kg of da\n", + "\n", + "relative humidity is 0.3034 \n", + "dew point temparature is 8 degrees\n", + "\n", + "enthalphy of moist air is 44.24 kg/kg of da\n" + ] + } + ], + "prompt_number": 4 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.5 : Pg - 293" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "p=1.01325 #pressure in bar\n", + "pv=0.020 #pressure in bar at 21 degrees temp\n", + "ws=0.0154 #kg/kg of da\n", + "w=0.0123 #kg/kg of da\n", + "vs=0.86 #under 21 degrees temp m*m*m/kg\n", + "w1=0.0074\n", + "#CALCULATIONS\n", + "pa=p-pv\n", + "sr=w/ws\n", + "rho=1/vs\n", + "avc=0.0163-w1\n", + "#RESULTS\n", + "print 'partial pressure of vapour and dry air are %0.2f bar and %0.5f bar'%(pv,pa)\n", + "print 'dew point temp is 17.4 degrees'\n", + "print 'specific humidity is 0.0123 kg/kg of da'\n", + "print '\\nsaturation ratio is %0.3f '%(sr)\n", + "print '\\ndensity of misture is %0.3f kg/m*m*m'%(rho)\n", + "print '\\namount of water vapour condensed is %0.4f kg/kg of da'%(avc)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "partial pressure of vapour and dry air are 0.02 bar and 0.99325 bar\n", + "dew point temp is 17.4 degrees\n", + "specific humidity is 0.0123 kg/kg of da\n", + "\n", + "saturation ratio is 0.799 \n", + "\n", + "density of misture is 1.163 kg/m*m*m\n", + "\n", + "amount of water vapour condensed is 0.0089 kg/kg of da\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.6 : Pg - 294" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "p=1.01325 #pressure in bar\n", + "w1=0.01468\n", + "td=20 #temp in degrees\n", + "tw=40 #temp in degrees\n", + "#CALCULATIONS\n", + "ha=(1.005*td+w1*(2500+1.86*td))\n", + "w2=(ha-(1.005*tw))/(2500+1.86*tw)\n", + "#RESULTS\n", + "print 'humidity rate is %0.2f kg/kg of da'%(ha)\n", + "print '\\nw2 is %0.5f kg/kg of da'%(w2)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "humidity rate is 57.35 kg/kg of da\n", + "\n", + "w2 is 0.00666 kg/kg of da\n" + ] + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.7 : Pg - 297" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "#initialisation of variables\n", + "ps1=0.006566 #bar pressure\n", + "phi1=0.6 #relative humidity\n", + "td2=21 #temp in degrees\n", + "td1=1 #temp in degrees\n", + "ps2=0.02486 #pressure in bar\n", + "td3=26 #temp in degrees\n", + "p=1.013 #pressure in bar\n", + "#CALCULATIONS\n", + "pv1=(phi1*ps1)\n", + "w=0.622*(pv1/(p-pv1))\n", + "q=(td2-td1)*(1.005+(1.86*w))\n", + "phi2=pv1/ps2\n", + "cbf=(td3-td2)/(td3-td1)\n", + "cf=1-cbf\n", + "#RESULTS\n", + "print 'heat supplied to air is %0.2f kg/kg of da'%(q)\n", + "print '\\nfinal relative humidity is %0.4f kg/kg of da'%(phi2)\n", + "print '\\ncoil bypass factor is %0.2f '%(cbf)\n", + "print '\\ncontact factor is %0.2f '%(cf)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "heat supplied to air is 20.19 kg/kg of da\n", + "\n", + "final relative humidity is 0.1585 kg/kg of da\n", + "\n", + "coil bypass factor is 0.20 \n", + "\n", + "contact factor is 0.80 \n" + ] + } + ], + "prompt_number": 7 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.8 : Pg - 298" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps1=0.056216 #bar pressure\n", + "phi1=0.2 #relative humidity\n", + "td1=35 #temp in degrees\n", + "p=1.01325 #pressure in bar\n", + "td2=25 #temp in degrees\n", + "ps2=0.03166 #bar\n", + "#CALCULATIONS\n", + "pv1=phi1*ps1\n", + "w1=0.622*(pv1/(p-pv1))\n", + "ha=(1.005*td1+w1*(2500+1.86*td1))\n", + "w2=(ha-(1.005*td2))/(2500+1.86*td2)\n", + "pv2=(w2*p)/(w2+0.622)\n", + "phi2=pv2/ps2\n", + "#RESULTS\n", + "print 'relative humidity rate is %0.2f kg/kg of da'%(ha)\n", + "print '\\nrelative humidity is %0.4f '%(phi2)\n", + "print '\\namount of water to be added is %0.5f kg/kg of da'%(w2)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "relative humidity rate is 53.08 kg/kg of da\n", + "\n", + "relative humidity is 0.5550 \n", + "\n", + "amount of water to be added is 0.01098 kg/kg of da\n" + ] + } + ], + "prompt_number": 8 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.9 : Pg - 300" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps1=0.056216 #bar pressure\n", + "ps3=0.023366 #bar pressure\n", + "phi1=0.6 #relative humidity\n", + "td3=20 #temp in degress\n", + "td1=35 #temp in degrees\n", + "td2=12 #temp in degrees\n", + "r=0.287\n", + "p=1.01325 #pressure in bar\n", + "x1=90.12 #kj/kg\n", + "x2=34.08 #kj/kg\n", + "x3=42.25 #kj/kg\n", + "hf=0.4 #kj/kg\n", + "w1=0.02142\n", + "w2=0.00873\n", + "#CALCULATIONS\n", + "pv1=phi1*ps1\n", + "w1=0.622*(pv1/(p-pv1))\n", + "h1=(1.005*td1+w1*(2500+1.86*td1))\n", + "pv3=phi1*ps3\n", + "w3=0.622*(pv3/(p-pv3))\n", + "h3=(1.005*td3+w3*(2500+1.86*td3))\n", + "h2=(1.005*td2+0.0073*(2500+1.86*td2))\n", + "ma=((p-pv1)*100*2.5)/(r*(td1+273))\n", + "q1=ma*(x2-x1)+(w1-w2)*hf\n", + "q2=(ma*(x3-x2))\n", + "#RESULTS\n", + "print 'mass of dry air is %0.2f kg/s'%(ma)\n", + "print '\\ncooler load on the dehumidyfier is %0.2f kw'%(q1) # ans wrong in the book\n", + "print '\\nheating load of the heater is %0.2f kw'%(q2)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "mass of dry air is 2.77 kg/s\n", + "\n", + "cooler load on the dehumidyfier is -155.24 kw\n", + "\n", + "heating load of the heater is 22.63 kw\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.10 : Pg - 302" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "x1=90.12 #kj/kg\n", + "x3=42.25 #kj/kg\n", + "ps3=0.023366 #bar pressure\n", + "td3=35 #temp in degrees\n", + "phi1=0.6 #relative humidity\n", + "p=1.01325 #pressure in bar\n", + "#CALCULATIONS\n", + "pv3=phi1*ps3\n", + "w3=0.622*(pv3/(p-pv3))\n", + "h3=(1.005*td3+w3*(2500+1.86*td3))\n", + "qs=h3-x3\n", + "ql=x1-h3\n", + "shf=qs/(qs+ql)\n", + "#RESULTS\n", + "print 'sensible heat removed is %0.2f kj/kg of da'%(qs)\n", + "print '\\nlatent heat removed is %0.2f kj/kg of da'%(ql)\n", + "print '\\nsensible heat factor is %0.2f '%(shf)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "sensible heat removed is 15.31 kj/kg of da\n", + "\n", + "latent heat removed is 32.56 kj/kg of da\n", + "\n", + "sensible heat factor is 0.32 \n" + ] + } + ], + "prompt_number": 10 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.11 : Pg - 302" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps1=0.010720 #bar pressure\n", + "phi1=0.3 #relative humidity\n", + "td1=8 #temp in degrees\n", + "td2=32 #temp in degrees\n", + "td3=30 #temp in degrees\n", + "ps3=0.042415 #bar pressure\n", + "phi3=0.5 #relative humidity\n", + "hf=762.6 #kj/kg\n", + "hfg=2013.6 #kj/kg\n", + "p=1.01325 #pressure in bar\n", + "#CALCULATIONS\n", + "pv1=phi1*ps1\n", + "w1=0.622*(pv1/(p-pv1))\n", + "h1=(1.005*td1+w1*(2500+1.86*td1))\n", + "h2=(1.005*td2+w1*(2500+1.86*td2))\n", + "ha=h2-h1\n", + "pv3=phi3*ps3\n", + "w3=0.622*(pv3/(p-pv3))\n", + "h3=(1.005*td3+w3*(2500+1.86*td3))\n", + "wa=w3-w1\n", + "hw=(h3-h2)/(w3-w1)\n", + "x=(hw-hf)/hfg\n", + "#RESULTS\n", + "print 'heat added is %0.2f kJ/kg of da'%(ha)\n", + "print '\\nwater added is %0.5f kg/kg of da'%(wa)\n", + "print 'temp os steam supplied is 179.88 degrees' #at 10 bar pressure\n", + "print '\\nsteam required is %0.2f kj/kg of steam'%(hw)\n", + "print '\\nquality of steam at 10 bar is %0.3f '%(x)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "heat added is 24.21 kJ/kg of da\n", + "\n", + "water added is 0.01132 kg/kg of da\n", + "temp os steam supplied is 179.88 degrees\n", + "\n", + "steam required is 2377.53 kj/kg of steam\n", + "\n", + "quality of steam at 10 bar is 0.802 \n" + ] + } + ], + "prompt_number": 11 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.12 : Pg - 305" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps1=0.023366 #bar pressure\n", + "phi1=0.4#relative humidity\n", + "td1=20 #temp in degrees\n", + "m1=40 #kg/s\n", + "ps2=0.01227 #bar pressure\n", + "phi2=0.8#relative humidity\n", + "td2=10 #temp in degrees\n", + "m2=20 #kg/s\n", + "p=1.01325 #pressure in bar\n", + "#CALCULATIONS\n", + "pv1=phi1*ps1\n", + "w1=0.622*(pv1/(p-pv1))\n", + "h1=(1.005*td1+w1*(2500+1.86*td1))\n", + "ma1=m1/(1+w1)\n", + "pv2=phi2*ps2\n", + "w2=0.622*(pv2/(p-pv2))\n", + "h2=(1.005*td2+w2*(2500+1.86*td2))\n", + "ma2=m2/(1+w2)\n", + "w3=((ma1*w1)+(ma2*w2))/(ma1+ma2)\n", + "h3=((ma1*h1)+(ma2*h2))/(ma1+ma2)\n", + "td3=((ma1*td1)+(ma2*td2))/(ma1+ma2)\n", + "#RESULTS\n", + "print 'specific humidity is %0.5f kJ/kg of da'%(w3)\n", + "print '\\ntemparature of air leaving chamber is %0.2f degrees'%(td3)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "specific humidity is 0.00589 kJ/kg of da\n", + "\n", + "temparature of air leaving chamber is 16.67 degrees\n" + ] + } + ], + "prompt_number": 12 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.13 : Pg - 307" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "ps1=0.062739 #bar pressure\n", + "phi1=0.9 #relative humidity\n", + "td1=37 #temp in degrees\n", + "td3=10.7 #dew point temparature\n", + "ps4=0.02366 #bar pressure\n", + "phi4=0.55 #relative humidity\n", + "td4=20 #temp in degrees\n", + "w12=1.5 #work input in kw\n", + "v4=50 #\n", + "t4=37+273 #temp in k\n", + "Ra = 0.287\n", + "r= 1\n", + "w2= 1\n", + "w3= 1\n", + "hf3= 2\n", + "p=1.01325 #pressure in bar\n", + "#CALCULATIONS\n", + "pv1=phi1*ps1\n", + "w1=0.622*(pv1/(p-pv1))\n", + "h1=(1.005*td1+w1*(2500+1.86*td1))\n", + "pv4=phi4*ps4\n", + "w4=0.622*(pv4/(p-pv4))\n", + "h4=(1.005*td4+w4*(2500+1.86*td4))\n", + "h3=(1.005*td3+w4*(2500+1.86*td3))\n", + "pa4=p-pv4\n", + "ma=(pa4*v4*100)/(Ra*t4)\n", + "q12=(w12*60)/ma\n", + "h2=h1+q12\n", + "q23=((h3+(w2-w3)*hf3)-h2)\n", + "Q23=-1*q23*ma\n", + "q34=h4-h3\n", + "Q34=q34*ma\n", + "#RESULTS\n", + "#ans in the book are wrong.\n", + "print 'enthalpy rate 1 is %0.2f kJ/kg of da'%(h1)\n", + "print '\\nenthalpy rate 4 is %0.2f kJ/kg of da'%(h4)\n", + "print '\\nenthalpy rate 3 is %0.2f kJ/kg of da'%(h3) \n", + "print '\\nmass of dry air is %0.2f kg/min'%(ma) \n", + "print '\\nenthalpy rate 2 is %0.2f kJ/kg of da'%(h2)\n", + "print '\\ncapacity od cooling coil q23 is %0.2f kJ/min'%(Q23)\n", + "print '\\ncapacity od cooling coil q34 is %0.2f kJ/min'%(Q34)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "enthalpy rate 1 is 131.48 kJ/kg of da\n", + "\n", + "enthalpy rate 4 is 40.63 kJ/kg of da\n", + "\n", + "enthalpy rate 3 is 31.14 kJ/kg of da\n", + "\n", + "mass of dry air is 56.21 kg/min\n", + "\n", + "enthalpy rate 2 is 133.08 kJ/kg of da\n", + "\n", + "capacity od cooling coil q23 is 5730.05 kJ/min\n", + "\n", + "capacity od cooling coil q34 is 533.25 kJ/min\n" + ] + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.14 : Pg - 310" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "td3=15 #dew point temparature\n", + "ps3=0.017039 #bar pressure\n", + "phi3=0.55 #relative humidity\n", + "p=1 #bar pressure\n", + "ps4=0.029821 #bar pressure\n", + "phi4=1 #relative humidity\n", + "td4=24 #temp in degrees\n", + "mw1=1000 #kg/min\n", + "hf1=109 #kj/kg\n", + "hf2=50.4 #kj/kg\n", + "w4=0.01912\n", + "w3=0.00588\n", + "#CALCULATIONS\n", + "pv3=phi3*ps3\n", + "w1=0.622*(pv3/(p-pv3))\n", + "h3=(1.005*td3+w3*(2500+1.86*td3))\n", + "pv4=phi4*ps4\n", + "w4=0.622*(pv4/(p-pv4))\n", + "h4=(1.005*td4+w4*(2500+1.86*td4))\n", + "ma=mw1*(hf1-hf2)/(h4-h3-(w4-w3)*hf2)\n", + "x=ma*(w4-w3) #mw1-mw2\n", + "mf=ma+x\n", + "pl=(x/mw1)*100\n", + "#RESULTS\n", + "print 'mass of dry air is %0.1f kg/min'%(ma)\n", + "print '\\nmass cooling water loss by evoporation is %0.2f kg/min '%(x)\n", + "print '\\nmass flow of moist air is %0.2f kg/min '%(mf)\n", + "print '\\npercentage loss by evoporation is %0.2f %%'%(pl)" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "mass of dry air is 1389.8 kg/min\n", + "\n", + "mass cooling water loss by evoporation is 18.40 kg/min \n", + "\n", + "mass flow of moist air is 1408.20 kg/min \n", + "\n", + "percentage loss by evoporation is 1.84 %\n" + ] + } + ], + "prompt_number": 14 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.15 : Pg - 311" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "td3=17 #dew point temparature\n", + "ps3=0.019362 #bar pressure\n", + "phi3=0.6 #relative humidity\n", + "p=0.98 #bar pressure\n", + "t3=290 #temp in k\n", + "ps4=0.042415 #bar pressure\n", + "phi4=1 #relative humidity\n", + "td4=30 #temp in degrees\n", + "mw2=80\n", + "v=110 #volume\n", + "ma=127.98\n", + "w4=0.02814\n", + "w3=0.007464\n", + "r=0.287\n", + "hf1=209.3\n", + "#CALCULATIONS\n", + "pv3=phi3*ps3\n", + "w3=0.622*(pv3/(p-pv3))\n", + "h3=(1.005*td3+w3*(2500+1.86*td3))\n", + "pa3=p-pv3\n", + "m=(pa3*v*100)/(r*t3)\n", + "h2=h3+(240/ma)\n", + "pv4=phi4*ps4\n", + "w4=0.622*(pv4/(p-pv4))\n", + "h4=(1.005*td4+w4*(2500+1.86*td4))\n", + "mw1=mw2+ma*(w4-w3)\n", + "hf2=((mw1*hf1)+(ma*h2)-(ma*h4))/mw2\n", + "#RESULTS\n", + "print 'mass of dry air is %0.2f kg/min'%(m)\n", + "print '\\nenthalpy rate 3 is %0.2f kJ/kg of da'%(h3)\n", + "print '\\nenthalpy rate 2 is %0.2f kJ/kg of da'%(h2)\n", + "print '\\nenthalpy rate 4 is %0.2f kJ/kg of da'%(h4)\n", + "print '\\nenthalpy rate is %0.1f kJ/kg of da'%(hf2)\n", + "print 'temparature of water leaving the tower is 27.1 degrees'" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "mass of dry air is 127.99 kg/min\n", + "\n", + "enthalpy rate 3 is 35.98 kJ/kg of da\n", + "\n", + "enthalpy rate 2 is 37.85 kJ/kg of da\n", + "\n", + "enthalpy rate 4 is 102.07 kJ/kg of da\n", + "\n", + "enthalpy rate is 113.5 kJ/kg of da\n", + "temparature of water leaving the tower is 27.1 degrees\n" + ] + } + ], + "prompt_number": 15 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Ex - 7.16 : Pg - 315" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initialisation of variables\n", + "uw=2.5\n", + "aw=127.82\n", + "to=34 #temp in degrees\n", + "tr=26 #temp in degrees\n", + "ur=1.5\n", + "ar=90\n", + "ag=8.68\n", + "clf1=100\n", + "pvwo=0.037782\n", + "p=1.013 #pressure in bar\n", + "a=6.66*10**-4\n", + "phi=0.5\n", + "#CALCULATIONS\n", + "shgw=uw*aw*(to-tr)\n", + "shgr=ur*ar*(to-tr)\n", + "sg=ag*clf1\n", + "pvo=pvwo-(p*a*(to-tr))\n", + "wo=0.622*(pvo/(p-pvo))\n", + "ho=(1.005*to+wo*(2500+1.86*to))\n", + "pvr=phi*pvo\n", + "wr1=0.622*(pvr/(p-pvr))\n", + "hr=(1.005*tr+wr1*(2500+1.86*tr))\n", + "#RESULTS\n", + "print 'recommended indoor conditions are 25.5-26.7 degrees and 50% rh and outdoor conditions are 26 degrees and 50%rh'\n", + "print 'area of the roof is 90 m*m'\n", + "print 'overall heat transfer coefficients are 2.5 w/m*m'\n", + "print '\\nsensible heat gain through walls is %0.2f '%(shgw)\n", + "print '\\nsensible heat gain through roofs is %0.2f '%(shgr)\n", + "print '\\nsensible heat gain through windows is %0.2f '%(sg)\n", + "print 'sensible heat per adult male is 67.5 W and latent heat is 55.7 W'\n", + "print '\\nenthalpy rate o is %0.2f '%(ho)\n", + "print '\\nenthalpy rate r is %0.2f '%(hr)\n", + "print 'volume of air infiltered is 1.628 m*m*m/min'\n", + "print 'latent heat gain is 902.4 W'\n", + "print 'sensible heat gain is 257.2 W'\n", + "print 'room sensible heat factor is 0.803'" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "recommended indoor conditions are 25.5-26.7 degrees and 50% rh and outdoor conditions are 26 degrees and 50%rh\n", + "area of the roof is 90 m*m\n", + "overall heat transfer coefficients are 2.5 w/m*m\n", + "\n", + "sensible heat gain through walls is 2556.40 \n", + "\n", + "sensible heat gain through roofs is 1080.00 \n", + "\n", + "sensible heat gain through windows is 868.00 \n", + "sensible heat per adult male is 67.5 W and latent heat is 55.7 W\n", + "\n", + "enthalpy rate o is 86.82 \n", + "\n", + "enthalpy rate r is 51.88 \n", + "volume of air infiltered is 1.628 m*m*m/min\n", + "latent heat gain is 902.4 W\n", + "sensible heat gain is 257.2 W\n", + "room sensible heat factor is 0.803\n" + ] + } + ], + "prompt_number": 16 + } + ], + "metadata": {} + } + ] +}
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