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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 19 - Reciprocating Expanders and Compressors"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 370"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the Horsepower output and mean effective pressure\n",
"#initialization of varaibles\n",
"print '%s' %(\"From tables,\")\n",
"h1=1185.3 #B/lb\n",
"v1=4.896 #cu ft/lb\n",
"v2=23.66 #cu ft/lb\n",
"h2=1054.3 #B/lb\n",
"Pd1=1 #cu ft\n",
"Pd2=0.98 #cu ft\n",
"N=300 #rpm\n",
"#calculations\n",
"Wx=h1-h2\n",
"Pd=Pd1+Pd2\n",
"Cl=0.05\n",
"mf=Pd*(1-Cl*(v2/v1 - 1))/v2\n",
"P=Wx*mf*N/(2545./60.)\n",
"mep=P*33000./(N*Pd)\n",
"#results\n",
"print '%s %.3f %s' %(\"Horsepower output =\",P,\"hp\")\n",
"print '%s %d %s' %(\"\\n Mean effective pressure =\",mep,\"psf\")\n",
"#The answers in the book are a bit different due to round off error.\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From tables,\n",
"Horsepower output = 62.679 hp\n",
"\n",
" Mean effective pressure = 3482 psf\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 370"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the mass flow rate when the clearences are 3% and 6%\n",
"#initialization of varaibles\n",
"R=53.34\n",
"T1=540. #R\n",
"P1=15. #psia\n",
"T2=720. #R\n",
"P2=60. #psia\n",
"PD=150. #cu ft/min\n",
"p1=0.03\n",
"p2=0.06\n",
"#calculations\n",
"v1=R*T1/(P1*144.)\n",
"vratio=T1*P2/(P1*T2)\n",
"Nmf=PD*(1-p1*(vratio-1))/v1\n",
"Nmf2=PD*(1-p2*(vratio-1))/v1\n",
"#results\n",
"print '%s %.1f %s' %(\"For clearance of 3 percent, Mass per min =\",Nmf,\"lb/min\")\n",
"print '%s %.1f %s' %(\"\\n For clearance of 6 percent, Mass per min =\",Nmf2,\"lb/min\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"For clearance of 3 percent, Mass per min = 10.6 lb/min\n",
"\n",
" For clearance of 6 percent, Mass per min = 9.9 lb/min\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
