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{
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"name": "",
"signature": "sha256:898a7449413e7734ec995548ea6831e656bb39837964368aebad3ba68a836203"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 6 : Combustion Charts"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.1 Page no : 123"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"r = 7.5\t\t\t\t\t#Compression ratio\n",
"\t\t\t\t\t#Data from combustion chart\n",
"p = [1,15.1,26.95,1.95]\t\t\t\t\t#Pressure of air fuel mixture in kg/cm**2\n",
"T = [60,460,1150,435]\t\t\t\t\t#Temperature of air fuel mixture in K\n",
"V = [16.98,2.264,2.264,16.98]\t\t\t\t\t#Volume in m**3/kg\n",
"U = [17,78.8,212,80]\t\t\t\t\t#Internal energy in kcal/kg\n",
"S = [0.07,0.07,0.22,0.22]\t\t\t\t\t#Entropy in kcal/kg.degree C\n",
"g = 1.4\t\t\t\t\t#Ratio of specific heats\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"n = (((U[2]-U[3])-(U[1]-U[0]))/(U[2]-U[1]))*100\t\t\t\t\t#Thermal efficiency in percent\n",
"na = (1-(1/r)**(g-1))*100\t\t\t\t\t#Air standard efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Thermal efficiency is %3.1f percent \\\n",
"\\nAir standard efficiency is %3.1f percent'%(n,na)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Thermal efficiency is 52.7 percent \n",
"Air standard efficiency is 55.3 percent\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.2 Page no : 127"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"\t\t\t\t\t#Data from combustion chart\n",
"p = [1,33,33,1]\t\t\t\t\t#Pressure of air fuel mixture in kg/cm**2\n",
"T = [65,600,1450,725]\t\t\t\t\t#Temperature of air fuel mixture in K\n",
"V = [16,1.23,3.45,16]\t\t\t\t\t#Volume in m**3/kg\n",
"U = [11.8,110,295,140]\t\t\t\t\t#Internal energy in kcal/kg\n",
"H = [22.7,150,395,225]\t\t\t\t\t#Enthalpy in kcal/kg\n",
"S = [0.068,0.068,0.264,0.264]\t\t\t\t\t#Entropy in kcal/kg.degree C\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"r = (V[0]/V[1])\t\t\t\t\t#Compression ratio\n",
"q = (H[2]-H[1])\t\t\t\t\t#Heat supplied in kcal/kg\n",
"qre = (U[3]-U[0])\t\t\t\t\t#Heat rejected in kcal/kg\n",
"nt = ((q-qre)/q)*100\t\t\t\t\t#Thermal efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'a)Compression ratio is %3.0f \\\n",
"\\nb) Heat supplied to the cycle is %3.0f kcal/kg \\\n",
"\\nc) Heat rejected by the cycle is %3.2f kcal/kg \\\n",
"\\nd) Thermal efficiency is %3.2f percent'%(r,q,qre,nt)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"a)Compression ratio is 13 \n",
"b) Heat supplied to the cycle is 245 kcal/kg \n",
"c) Heat rejected by the cycle is 128.20 kcal/kg \n",
"d) Thermal efficiency is 47.67 percent\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.3 Page no : 130"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"\t\t\t\t\t#Data from combustion chart\n",
"p = [1,51.5,77.25,77.25,3.75]\t\t\t\t\t#Pressure of air fuel mixture in kg/cm**2\n",
"T = [16,1,1,1.5,16]\t\t\t\t\t#Temperature of air fuel mixture in K\n",
"V = [65,745,1400,2200,1030]\t\t\t\t\t#Volume in m**3/kg\n",
"U = [14.7,135,275,475,197]\t\t\t\t\t#Internal energy in kcal/kg\n",
"H = [21.9,85,372,625,280]\t\t\t\t\t#Enthalpy in kcal/kg\n",
"S = [0.068,0.068,0.19,0.32,0.32]\t\t\t\t\t#Entropy in kcal/kg.degree C\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"nth = (((U[2]-U[1])+(H[3]-H[2])-(U[4]-U[0]))/((U[2]-U[1])+(H[3]-H[2])))*100\t\t\t\t\t#Thermal efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Thermal efficiency is %3.2f percent'%(nth)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Thermal efficiency is 53.61 percent\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
