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{
"metadata": {
"name": "",
"signature": "sha256:131e5807eda8c30572547a9b8e6ec8831945c814f15b621bc05038f1dbaad1ff"
},
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter11:Small Hydro Resources"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex11.1:pg-355"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"# given data\n",
"rho=996 # density in kg/m^3\n",
"effi=0.55 # oveall efficiency\n",
"Q=100/1000.0 # discharge in m^3/sec\n",
"h=30 # gross head in m\n",
"g=9.81 # gravitational acceleration in m/sec^2\n",
"\n",
"\n",
"Pnet=effi*rho*Q*g*h/1000 # net power in watts\n",
"print \"Power available is\",round(Pnet,3),\"kilowatts\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Power available is 16.122 kilowatts\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex11.2:pg-356"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"# given data\n",
"pf=0.8 # power factor\n",
"Load=3 # load in kW\n",
"V=230 # voltage of kettle in V\n",
"P=500 # power of kettle in W\n",
"VA=pf*Load # VA load in kVA\n",
"C=4200 # specific heat of water in j/kg-K\n",
"T=45-20 # temperature difference in degree celsius\n",
"\n",
"VAR=VA*1.6 # net required VAR rating thus 60% extra capacity\n",
"\n",
"R=(V**2)/P # resistance by kettle in ohms\n",
"\n",
"Po=7*(V**2)/R # power dissipation in W for 7 elements\n",
"\n",
"print \"7 elements are connected in parallel\"\n",
"\n",
"Q=Load*1000.0/(C*T) # flow rate in kg/sec\n",
"\n",
"print\"The required flow rate is \",round(Q,5),\"litre/sec\"\n",
"\n",
"\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"7 elements are connected in parallel\n",
"The required flow rate is 0.02857 litre/sec\n"
]
}
],
"prompt_number": 11
}
],
"metadata": {}
}
]
}
|
