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{
"metadata": {
"name": "EHP-6"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": "Steam Power Plant Cycles"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6.1,Page 366"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nP1=200.0 #psia\nT1=600.0 #F\nP2=2.0 #psia\nJ=778.0\n\n#calculations\n#\"from mollier charts,\"\nh1=1322 #Btu/lb\nh2=974 #Btu/lb\nvf2=0.01623 #cu ft per lb\nhf2=94.0 #Btu/lb\nt2=126.0 #F\nWtj=h1-h2\nQout=h2-hf2\nWp=(P1-P2)*vf2\nWpj=Wp/J\nh3=hf2+Wpj\nQin=h1-h3\netat=((h1-h2)-Wpj)/(h1-(hf2+Wpj)) #efficiency\neta=((h1-h2))/(h1-(hf2)) #efficiency\n\n#results\nprint round(etat*100,3),\"Efficiency of rankine cycle in percent\"\nprint round(eta*100,3),\" Efficiency of rankine cycle neglecting boiler feed pump in percent\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "28.339 Efficiency of rankine cycle in percent\n28.339 Efficiency of rankine cycle neglecting boiler feed pump in percent\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6.2,Page 366"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nB=70 #F\nP1=140 #psia\nx=0.986\nP2=14.7 #psia\nms=2000.0 #lb/hr\nIhp=80.0\n\n#calculations\n#\"From mollier charts\"\nhc=38 #Btu/lb\nhf=324.82 #Btu/lb\nhfg=868.2 #Btu/lb\nh1=hf+x*hfg\nQin=ms*(h1-hc)\neta=Ihp*2545*100/(Qin) #efficiency\nQw=Ihp*2545 \nQr=Qin-Qw\nper=Qr/Qin *100 #percent\n\n#results\nprint \"Heat input to the boiler in Btu/hr\",round(Qin,3)\nprint \" Cycle efficiency in percent\",round(eta,3)\nprint \" Heat rejected to waste in Btu/hr is\",round(Qr,3),\" or in percent of Qin\",round(per,3)\nprint \"The answer is a bit different due to rounding off error in textbook\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Heat input to the boiler in Btu/hr 2285730.4\n Cycle efficiency in percent 8.907\n Heat rejected to waste in Btu/hr 2082130.4 or in percent of Qin 91.093\nThe answer is a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6.3,Page 372"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nB=70.0 #F\nP1=140.0 #psia\nx=0.986\nP2=14.7 #psia\nms=2000 #lb/hr\nIhp=80\n\n#calculations\n#\"From mollier charts\"\nhc=180.0 #Btu/lb\nhf=324.82 #Btu/lb\nhfg=868.2 #Btu/lb\nh1=hf+x*hfg\nQin=ms*(h1-hc)\neta=Ihp*2545*100/(Qin)\nQw=Ihp*2545 #Btu/hr\nQr=Qin-Qw #Btu/hr\nper=Qr/Qin *100 #percent\n\n#results\nprint \"Heat input to the boiler in Btu/hr\",round(Qin,3)\nprint \" Cycle efficiency in percent\",round(eta,3)\nprint \" Heat rejected to waste in Btu/hr is\",round(Qr,3),\" or in percent of Qin\",round(per,3)\nprint \"The answer is a bit different due to rounding off error in textbook\"",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Heat input to the boiler in Btu/hr 2001730.4\n Cycle efficiency in percent 10.171\n Heat rejected to waste in Btu/hr 1798130.4 in percent of Qin 89.829\nThe answer is a bit different due to rounding off error in textbook\n"
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 6.4,Page 380"
},
{
"cell_type": "code",
"collapsed": false,
"input": "# Initialization of Variable\nfrom math import pi\nfrom math import atan\nfrom numpy import *\nm=1.24 #lb\nHV=11300 #Btu/lb\n\n#calculations\nHR=m*HV\neff=3413/HR #efficiency\n\n#results\nprint \"Plant heat rate in Btu/kw hr\",round(HR,3)\nprint \" Overall efficiency in percent\",round(eff*100,3)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Plant heat rate in Btu/kw hr 14012.0\n Overall efficiency in percent 24.358\n"
}
],
"prompt_number": 10
}
],
"metadata": {}
}
]
}
|
