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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 15 : Positive-displacement Machines"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 15.2.1 page no : 490"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import math \n",
"#initialisation of variables\n",
"B= 34. \t\t\t#ft\n",
"z= 6. \t\t\t#ft\n",
"g= 32.2 \t\t\t#ft/sec**2\n",
"d= 6. \t\t\t#in\n",
"do= 2. \t\t\t#in\n",
"l= 6. \t\t\t#ft\n",
"l1= 0.04\n",
"\t\t\t\n",
"#CALCULATIONS\n",
"s= math.sqrt((g*do**2*(B-6-z))/(l*d**2*(d/12)))\n",
"s1= s*60/(2*math.pi)\n",
"hf= l1*(l/(2*g*(do/12)))*(d**2*s*d/(12*do**2))**2\n",
"\t\t\t\n",
"#RESULTS\n",
"print ' maximum friction head= %.2f ft'%(hf)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" maximum friction head= 11.88 ft\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 15.3.1 pageno : 493"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import math \n",
"#initialisation of variables\n",
"f= 0.01\n",
"l= 160. \t\t\t#ft\n",
"g= 32.2 \t\t\t#ft/sec**2\n",
"d1= 10. \t\t\t#in\n",
"d2= 4.5 \t\t\t#in\n",
"w= 62.3 \t\t\t#lbf/ft**3\n",
"v= 60. \t\t\t#rev/min\n",
"\t\t\t\n",
"#CALCULATIONS\n",
"hf= (4*f*l/(2*g*(d2/12)))*(d1**2*3*2*math.pi/(4*d2**2))**2\n",
"h1= (2*hf/3)\n",
"r= (d1**2*3/(d2**2*2))\n",
"h= (4*f*l*r**2/(2*g*(d2/12)))\n",
"W= (math.pi*d1**2*1.5*w*10*v/(4*1444))\n",
"hp= W*(h1-h)/33000.\n",
"\t\t\t\n",
"#RESULTS\n",
"print ' Horse power saved= %.1f h.p'%(hp)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Horse power saved= 7.5 h.p\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 15.4.1 page no : 496"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import math \n",
"#initialisation of variables\n",
"d= 12. \t\t\t#in\n",
"n= 3.\n",
"l= 24. \t\t\t#in\n",
"w= 1100. \t\t\t#gallons\n",
"l1= 380.\t\t\t#ft\n",
"l2= 4. \t\t\t#ft\n",
"l3=56. \t\t\t#ft\n",
"\t\t\t\n",
"#CALCULATIONS\n",
"r= 0.98*n*math.pi*(d/12)**2*(l/12.)\n",
"Q= w/6.23\n",
"C= Q/r\n",
"p= w*10*(l1+l2+l3)/(0.9*33000.)\n",
"\t\t\t\n",
"#RESULTS\n",
"print ' Horse power required to drive= %.f h.p'%(p)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Horse power required to drive= 163 h.p\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
