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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 5 The first law and the dynamic open system"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:5.2 Pg:105"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"work done by the system = -9.7 Btu/lbm\n",
"\n",
" Power = -48.6 Btu/s\n"
]
}
],
"source": [
"## 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**2- V1**2)/(2*gc*J) -g/gc *(Z2-Z1)/J\n",
"power=dw*rate\n",
"#results\n",
"print \"work done by the system = %.1f Btu/lbm\"%(dw)\n",
"print \"\\n Power = %.1f Btu/s\"%(power)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:5.3 Pg:106"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Area of inlet pipe = 0.75 ft**2\n"
]
}
],
"source": [
"#Initialization of variables\n",
"V=100.0 #ft/s\n",
"v=15 #lbm/ft**3\n",
"m=5 #lbm/s\n",
"#calculations\n",
"A=m*v/V\n",
"#results\n",
"print \"Area of inlet pipe = %.2f ft**2\"%(A)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex:5.4 Pg:106"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"From table B-4\n",
"Final temperature of the steam = 540 F\n",
"\n",
" Change in temperature = 212 F\n"
]
}
],
"source": [
"#Initialization of variables\n",
"P=100.0 #psia\n",
"#calculations\n",
"print \"From table B-4\"\n",
"h=1187.2 #Btu/lbm\n",
"t1=328 #F\n",
"t2=540 #F\n",
"dt=t2-t1\n",
"#results\n",
"print \"Final temperature of the steam = %d F\"%(t2)\n",
"print \"\\n Change in temperature = %d F\"%(dt)"
]
}
],
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"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
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"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.9"
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"nbformat": 4,
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|
