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{
"metadata": {
"name": "",
"signature": "sha256:66c08bada2ebadfa7866fc7150bec839eef52fbd4cb045f832cc9b9f75b7501a"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 1 : Introduction"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.1 Page no : 7"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\t\t\n",
"#Input data\n",
"BHP = 51.\t\t\t\t\t#Brake horse power in h.p\n",
"N = 1000.\t\t\t\t\t#Speed in r.p.m\n",
"FHP = 17.\t\t\t\t\t#Friction horse power in h.p\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"IHP = (BHP+FHP)\t\t\t\t\t#Indicated Horse power in h.p\n",
"mn = (BHP/IHP)*100\t\t\t\t\t#Mechanical efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Mechanical efficiency of the engine is %i percent'%(mn)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Mechanical efficiency of the engine is 75 percent\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.2 Page no : 10"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#Data taken from Ex.No.1\n",
"BHP = 51.\t\t\t\t\t#Brake horse power in h.p\n",
"N = 1000.\t\t\t\t\t#Speed in r.p.m\n",
"FHP = 17.\t\t\t\t\t#Friction horse power in h.p\n",
"\t\t\t\t\t\n",
"#Input data\n",
"O1 = BHP/2\t\t\t\t\t#Half of b.h.p output in h.p\n",
"O2 = 10\t\t\t\t\t#Brake horse power in h.p\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"#Case(i)\n",
"IHP1 = (O1+FHP)\t\t\t\t\t#Indicated Horse power in h.p\n",
"mn1 = (O1/IHP1)*100\t\t\t\t\t#Mechanical efficiency in percent\n",
"\n",
"#Case(ii)\n",
"IHP2 = (O2+FHP)\t\t\t\t\t#Indicated Horse power in h.p\n",
"mn2 = (O2/IHP2)*100\t\t\t\t\t#Mechanical efficiency in percent\n",
"\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Mechanical efficiency of the engine when it delivers \\\n",
"\\na) Half the b.h.p output is %3.0f percent \\\n",
"\\nb) 10 b.h.p is %3.0f percent'%(mn1,mn2)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Mechanical efficiency of the engine when it delivers \n",
"a) Half the b.h.p output is 60 percent \n",
"b) 10 b.h.p is 37 percent\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.3 Page no : 12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"Fc = 220.\t\t\t\t\t#Fuel consumption in gm/(b.h.p*hr)\n",
"CV = 10600.\t\t\t\t\t#Calorific value in kcal/kg\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"hf = (Fc/1000)*CV\t\t\t\t\t#Heat supplied in kcal/hr\n",
"O = 632.\t\t\t\t\t\n",
"#Output in terms of kcal/hr\n",
"bn = (O/hf)*100\t\t\t\t\t#Brake thermal efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Brake thermal efficiency is %3.1f percent'%(bn)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Brake thermal efficiency is 27.1 percent\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.4 Page no : 12"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"IHP = 45.\t\t\t\t\t#Indicated horse power in h.p\n",
"Fc = 13.\t\t\t\t\t#Fuel consumption in litres/hr\n",
"g = 0.8\t\t\t\t\t#Specific gravity of oil\n",
"nm = 80.\t\t\t\t\t#Mechanical efficiency in percent\n",
"CV = 10000.\t\t\t\t\t#Calorific value of fuel in kcal/kg\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"BHP = (IHP*nm)/100\t\t\t\t\t#Brake horse power in h.p\n",
"hi = (Fc*g*CV)\t\t\t\t\t#Heat supplied in kcal/hour\n",
"In = ((IHP*4500*60)/(427*hi))*100\t\t\t\t\t#Indicated thermal efficiency in percent\n",
"Bn = (In*(nm/100))\t\t\t\t\t#Brake thermal efficiency in percent\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Indicated thermal efficiency is %3.2f percent \\\n",
"\\nBrake thermal efficiency is %3.2f percent'%(In,Bn)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Indicated thermal efficiency is 27.36 percent \n",
"Brake thermal efficiency is 21.89 percent\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1.5 Page no : 13"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"BHP = 15.\t\t\t\t\t#Brake horse power in h.p\n",
"In = 28.\t\t\t\t\t#Indicated thermal efficiency in percent\n",
"mn = 75.\t\t\t\t\t#Mechanical efficiency in percent\n",
"CV = 10000.\t\t\t\t\t#Calorific value of fuel in kcal/kg\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"Bn = ((In/100)*(mn/100))*100\t\t\t\t\t#Brake thermal efficiency in percent\n",
"I = (BHP/(Bn/100))*((4500.*60)/427)\t\t\t\t\t#Input in kcal/hr\n",
"Fc = (I/CV)\t\t\t\t\t#Fuel consumption in kg/hr\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'Fuel consumption of the engine is %3.2f kg/hr'%(Fc)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Fuel consumption of the engine is 4.52 kg/hr\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
