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{
"metadata": {
"name": "",
"signature": "sha256:290fc441b8b16bf79982880c80bb6a81fed30d12de1c6a3c7f5a66a567e435bd"
},
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"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 10: Refrigeration"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.1, page no. 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#initialization\n",
"capacity = 5.0 #tons\n",
"hp = 10.0 #hp\n",
"\n",
"#calculation\n",
"beta = (778*3.33*capacity)/(hp*550)\n",
"\n",
"#result\n",
"print \"Coefficient of performance = \", round(beta, 2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Coefficient of performance = 2.36\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.2, page no. 197"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#initialization\n",
"P1 = 30.0 #lb/in^2\n",
"P2 = 200.0 #lb/in^2\n",
"capacity = 3.0 #tons\n",
"\n",
"#calculation\n",
"#From the pressure enthalpy chart\n",
"Tt1 = -1 #F\n",
"st1 = 1.34\n",
"ht1 = 612.0\n",
"ht2 = 733.0\n",
"ht3 = 141.0\n",
"ht4 = 141.0\n",
"WbyJ = ht2-ht1\n",
"Q = ht1-ht3\n",
"beta = Q/WbyJ\n",
"Qdot = capacity*3.33\n",
"wdot = Qdot/Q\n",
"Power = wdot*778*WbyJ\n",
"Power = Power/550.0\n",
"\n",
"#result\n",
"print \"Coefficient of performance = \", round(beta, 2)\n",
"print \"Evarator temperature = %d F\" %Tt1\n",
"print \"Power required = %.2f hp\" %Power\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Coefficient of performance = 3.89\n",
"Evarator temperature = -1 F\n",
"Power required = 3.63 hp\n"
]
}
],
"prompt_number": 13
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.3, page no. 200"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#initialization\n",
"P1 = 14.0 #lb/in^2\n",
"P2 = 60.0 #lb/in^2\n",
"Tt1 = 80+460.0 #R\n",
"Tt4 = -20+460.0 #R\n",
"m = 30.0 #lbm/sec\n",
"cp = 0.24\n",
"\n",
"#calculation\n",
"Tt2 = round(Tt1*(P2/P1)**(0.286))\n",
"Tt3 = round(Tt4*(P2/P1)**(0.286))\n",
"WbyJ1 = cp*(Tt2-Tt1)\n",
"WbyJ2 = cp*(Tt3-Tt4)\n",
"Q = cp*(Tt1-Tt4)\n",
"beta = Q/(WbyJ1-WbyJ2)\n",
"Power = (m*778)*(WbyJ1-WbyJ2)\n",
"Wdot = Power/550.0\n",
"\n",
"#result\n",
"print \"Coefficient of performance = %.3f\" %beta\n",
"print \"Net power = %d hp\" %Wdot\n",
"\n",
"#difference in answer due to rounding of in Python"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Coefficient of performance = 1.923\n",
"Net power = 529 hp\n"
]
}
],
"prompt_number": 24
}
],
"metadata": {}
}
]
}
|
