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{
"metadata": {
"name": "",
"signature": "sha256:f4925d0b2e463188ddde753ce40d3c66c53a733743431193f8411c4532c3afc1"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter8-Geothermal Energy"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 8.5.1-pg 450"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"##Ex8.5.1.;calculate: steam flow rate,cooling water flow,plant efficiency,Heat rate\n",
"\n",
"##Enthalpy at point 1 at (31 kg/cm^2)=669.6 kcal/kg\n",
"##H1=H2=H3,enthalpy remain constant during throttling\n",
"H1=669.7;##unit= kcal/kg\n",
"H2=669.7;##unit= kcal/kg\n",
"H3=669.7;##unit= kcal/kg\n",
"##At point 3,\n",
"P3=9.55;##unit= kg/cm^2\n",
"##specific volume\n",
"vs3=0.22;##unit=m^3/kg\n",
"##Entropy\n",
"S3=1.580\n",
"T3=190.;##unit=degree C,(degree of superheat=13 degree C)\n",
"##S4_s at 0.34 kg/cm^2=S3\n",
"##x4_s=0.838\n",
"##and H4_s=hs+xL\n",
"H4_s=72.+(0.838*556)\n",
"print'%s %.2f %s'%(\" H4_s=\",H4_s,\" kcal/kg\")\n",
"##Isentropic turbine work=H3-H4_s\n",
"ITW=H3-H4_s;\n",
"print'%s %.2f %s'%(\"\\n Isentropic turbine work=\",ITW,\" kcal/kg\");\n",
"##Actual turbine work\n",
"ATW=0.80*ITW;\n",
"print'%s %.2f %s'%(\"\\n Actual turbine work=\",ATW,\" kcal/kg\");\n",
"H4=669.7-ATW;\n",
"print'%s %.2f %s'%(\"\\n H4=\",H4,\" kcal/kg\")\n",
"h5_6=72;##unit= kcal/kg; (Ignoring pump work)\n",
"##sensible heat h7=h5=25 kcal/kg\n",
"h5=25;##unit=kcal/kg\n",
"h7=25;##unit=kcal/kg\n",
"##Turbine steam flow\n",
"TSF=(250*0.860*10**6)/(ATW*0.9);\n",
"print'%s %.2f %s'%(\"\\n Turbine steam flow=\",TSF,\" kg/hr\");\n",
"##let\n",
"m4=TSF;\n",
"##Turbine volume flow\n",
"TVF=(TSF/60)*vs3;\n",
"print'%s %.2f %s'%(\"\\n Turbine volume flow=\",TVF,\" m^3/min\");\n",
"##cooling water flow m7:m7(h5_6-h7)=m4(H4-h5_6)\n",
"m7=((H4-h5_6)/(h5_6-h7))*m4;\n",
"print'%s %.2f %s'%(\"\\n cooling water flow m7=\",m7,\" kg/hr\");\n",
"Heat_added=H1-h5_6;\n",
"print'%s %.2f %s'%(\"\\n Heat_added=\",Heat_added,\" kcal/kg\");\n",
"##plant efficiency=(Actual Turbine work*nmg)/Heat added\n",
"##nmg=combined mechanical and electrical efficiency of turbine-generator\n",
"nmg=0.90;\n",
"Plant_efficiency=(ATW*nmg)/Heat_added;\n",
"plant_efficiency=Plant_efficiency*100.;\n",
"print'%s %.2f %s'%(\"\\n Plant Efficiency nplant=\",plant_efficiency,\" persent\");\n",
"##Plant heat rate=(860*Heat_added)/net_work\n",
"##net_work=105.36*0.90\n",
"Plant_heat_rate=(860./Plant_efficiency);\n",
"print'%s %.2f %s'%(\"\\n Plant heat rate=\",Plant_heat_rate,\" kcal/kWH\");\n",
"\n",
"\n",
"##The value of \"turbine steam flow\" is wrong due to calculating mistak in textbook,due to which the further value related with it is given wrong\n",
"##The values are corrected in this program\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" H4_s= 537.93 kcal/kg\n",
"\n",
" Isentropic turbine work= 131.77 kcal/kg\n",
"\n",
" Actual turbine work= 105.42 kcal/kg\n",
"\n",
" H4= 564.28 kcal/kg\n",
"\n",
" Turbine steam flow= 2266119.59 kg/hr\n",
"\n",
" Turbine volume flow= 8309.11 m^3/min\n",
"\n",
" cooling water flow m7= 23735548.77 kg/hr\n",
"\n",
" Heat_added= 597.70 kcal/kg\n",
"\n",
" Plant Efficiency nplant= 15.87 persent\n",
"\n",
" Plant heat rate= 5417.84 kcal/kWH\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 8.5.2-pg460"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"##Ex8.5.2.;calculate: hot water flow,condenser cooling water flow,cycle efficiency,plant heat rate.\n",
"import math\n",
"H1=669.6;##unit=kcal/kg\n",
"H2=669.6;##unit=kcal/kg\n",
"##pressure at point 2,is 10.5 kg/cm^2;thus,\n",
"T2=195.;##unit=degree celcius; (14 degree celcius of superheat)\n",
"s2=1.567;\n",
"vsup=0.27;\n",
"x3s=0.832;\n",
"H3s=535.;##unit=kcal/kg\n",
"##Isentropic turbine work\n",
"ITW=H2-H3s;\n",
"print'%s %.2f %s'%(\" Isentropic turbine work=\",ITW,\" kcal/kg\");\n",
"##Actual turbine work\n",
"ATW=0.65*ITW;\n",
"print'%s %.2f %s'%(\"\\n Actual turbine work=\",ATW,\" kcal/kg\");\n",
"H3=669.6-ATW;\n",
"print'%s %.2f %s'%(\"\\n H3=\",H3,\" kcal/kg\")\n",
"##h_4-5(ignore bpump work)\n",
"h4=72.4;##unit=kcal/kg\n",
"##h6 at 27 degree c\n",
"h6=27;##unit=kcal/kg\n",
"##Turbine steam flow or hot water flow=power output/actual turbine work\n",
"TSF=(10*10**6*0.86)/ATW;\n",
"print'%s %.2f %s'%(\"\\n Turbine steam flow or hot water flow=\",TSF,\" kg/hr\");\n",
"##consider cooling water flow m4:m3*(H3-h4)=m4(h4-h6)\n",
"##or\n",
"m4=((582.11-72.4)*0.983*10**5)/(72.4-27);\n",
"print'%s %.2f %s'%(\"\\n cooling water flow=\",m4,\" kg/hr\");\n",
"Heat_added=H1-h4\n",
"print'%s %.2f %s'%(\"\\n Heat_added=\",Heat_added,\" kcal/kg\");\n",
"##plant efficiency=Turbine work/Heat added\n",
"Plant_efficiency=(ATW/Heat_added);\n",
"plant_efficiency=Plant_efficiency*100;\n",
"print'%s %.2f %s'%(\"\\n Plant Efficiency=\",plant_efficiency,\" persent\");\n",
"##Plant heat rate=860/Plant Efficiency\n",
"Plant_heat_rate=860./Plant_efficiency;\n",
"print'%s %.2f %s'%(\"\\n Plant heat rate=\",Plant_heat_rate,\" kcal/kWh\");\n",
"\n",
"\n",
"##The value of m3=14.03*10^5 is given wrong in the text book;the actual value is m3=11.03*10^5\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Isentropic turbine work= 134.60 kcal/kg\n",
"\n",
" Actual turbine work= 87.49 kcal/kg\n",
"\n",
" H3= 582.11 kcal/kg\n",
"\n",
" Turbine steam flow or hot water flow= 98296.95 kg/hr\n",
"\n",
" cooling water flow= 1103623.19 kg/hr\n",
"\n",
" Heat_added= 597.20 kcal/kg\n",
"\n",
" Plant Efficiency= 14.65 persent\n",
"\n",
" Plant heat rate= 5870.29 kcal/kWh\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
