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"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 24 - Refrigeration"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 461"
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"input": [
"#calculate the cop in both cases and also the piston displacement\n",
"#initialization of varaibles\n",
"print '%s' %(\"From tables,\")\n",
"h1=611.8 #B/lb\n",
"h2=704.4 #B/lb\n",
"h3=127.4 #B/lb\n",
"h4=h3\n",
"T2=460. #R\n",
"T1=76+460. #R\n",
"W=10000. #B/hr\n",
"e=0.7\n",
"#calculations\n",
"Qe=h1-h4\n",
"Wc=h2-h1\n",
"CP=Qe/Wc\n",
"CP2=T2/(T1-T2)\n",
"w=W/(Qe*60.)\n",
"v1=9.116 #cu ft/lb\n",
"PD=w*v1/(e)\n",
"#results\n",
"print '%s %.2f' %(\"Coefficient of performance in case 1 = \",CP)\n",
"print '%s %.2f' %(\"\\n Coefficient of performance in case 2 = \",CP2)\n",
"print '%s %.2f %s' %(\"\\n Piston displacement =\",PD,\"cu ft/min\")\n"
],
"language": "python",
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"outputs": [
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"output_type": "stream",
"stream": "stdout",
"text": [
"From tables,\n",
"Coefficient of performance in case 1 = 5.23\n",
"\n",
" Coefficient of performance in case 2 = 6.05\n",
"\n",
" Piston displacement = 4.48 cu ft/min\n"
]
}
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|
