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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5 - The first law and the dynamic open system"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 86"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Calculate the work done and power of the system\n",
"#Initialization of variables\n",
"rate= 5 #lbm/sec\n",
"Q=50. #Btu/s\n",
"h2=1020. #Btu/lbm\n",
"h1=1000. #Btu/lbm\n",
"V2=50. #ft/s\n",
"V1=100. #ft/s\n",
"J=778.\n",
"g=32.2 #ft/s^2\n",
"gc=g\n",
"Z2=0\n",
"Z1=100. #ft\n",
"#calculations\n",
"dw=Q/rate -(h2-h1) -(V2*V2- V1*V1)/(2*gc*J) -g/gc *(Z2-Z1)/J\n",
"power=dw*rate\n",
"#results\n",
"print '%s %.1f %s' %(\"work done by the system =\",dw,\"Btu/lbm\")\n",
"print '%s %.1f %s' %(\"\\n Power =\",power,\"Btu/s\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"work done by the system = -9.7 Btu/lbm\n",
"\n",
" Power = -48.6 Btu/s\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 87"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the area of the inlet pipe\n",
"#Initialization of variables\n",
"V=100. #ft/s\n",
"v=15. #lbm/ft^3\n",
"m=5. #lbm/s\n",
"#calculations\n",
"A=m*v/V\n",
"#results\n",
"print '%s %.2f %s' %(\"Area of inlet pipe =\",A,\"ft^2\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Area of inlet pipe = 0.75 ft^2\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}
|
