From df60071cf1d1c18822d34f943ab8f412a8946b69 Mon Sep 17 00:00:00 2001 From: hardythe1 Date: Wed, 3 Jun 2015 15:27:17 +0530 Subject: add books --- .../Chapter_18_1.ipynb | 240 +++++++++++++++++++++ 1 file changed, 240 insertions(+) create mode 100755 Elements_of_Thermodynamics_and_heat_transfer/Chapter_18_1.ipynb (limited to 'Elements_of_Thermodynamics_and_heat_transfer/Chapter_18_1.ipynb') diff --git a/Elements_of_Thermodynamics_and_heat_transfer/Chapter_18_1.ipynb b/Elements_of_Thermodynamics_and_heat_transfer/Chapter_18_1.ipynb new file mode 100755 index 00000000..8c56b4c9 --- /dev/null +++ b/Elements_of_Thermodynamics_and_heat_transfer/Chapter_18_1.ipynb @@ -0,0 +1,240 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:f6da3400e962f069ab8b21139258f5f7cf61e5a3c236ae304fff64bfb1520423" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 18 - Refrigeration" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1 - Pg 347" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#calculate the cop, hp required, work of compression and expansion\n", + "#Initialization of variables\n", + "Ta=500. #R\n", + "Tr=540. #R\n", + "#calculations\n", + "cop=Ta/(Tr-Ta)\n", + "hp=4.71/cop\n", + "print '%s' %(\"From steam tables,\")\n", + "ha=48.02\n", + "hb=46.6\n", + "hc=824.1\n", + "hd=886.9\n", + "Wc=-(hd-hc)\n", + "We=-(hb-ha)\n", + "#results\n", + "print '%s %.1f' %(\"Coefficient of performance =\",cop)\n", + "print '%s %.3f %s' %(\"\\n horsepower required per ton of refrigeration =\",hp,\" hp/ton refrigeration\")\n", + "print '%s %.1f %s' %(\"\\n Work of compression =\",Wc,\" Btu/lbm\")\n", + "print '%s %.2f %s' %(\"\\n Work of expansion =\",We,\"Btu/lbm\")" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "From steam tables,\n", + "Coefficient of performance = 12.5\n", + "\n", + " horsepower required per ton of refrigeration = 0.377 hp/ton refrigeration\n", + "\n", + " Work of compression = -62.8 Btu/lbm\n", + "\n", + " Work of expansion = 1.42 Btu/lbm\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 2 - Pg 349" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#calculate the cop\n", + "#Initialization of variables\n", + "x=0.8\n", + "he=26.28 #Btu/lbm\n", + "hb=26.28 #Btu/lbm\n", + "pe=98.76 #psia\n", + "pc=51.68 #psia\n", + "hc=82.71 #Btu/lbm\n", + "hf=86.80+0.95\n", + "#calculations\n", + "dwisen=-(hf-hc)\n", + "dwact=dwisen/x\n", + "hd=hc-dwact\n", + "cop=(hc-hb)/(hd-hc)\n", + "#results\n", + "print '%s %.2f' %(\"Coefficient of performance = \",cop)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Coefficient of performance = 8.96\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 3 - Pg 351" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#calculate the work done, hp required, relative efficiency and mass flow rate, Compressor capacity\n", + "#Initialization of variables\n", + "hc=613.3#btu/lbm\n", + "hb=138.9#btu/lbm\n", + "ha=138.9#btu/lbm\n", + "hd=713.4 #btu/lbm\n", + "ta=464.7 #R\n", + "t0=545.7 #R\n", + "v=8.150 #ft^3/lbm\n", + "#calculations\n", + "Qa=hc-hb\n", + "Qr=ha-hd\n", + "Wcd=Qa+Qr\n", + "cop=abs(Qa/Wcd)\n", + "hp=abs(4.71/cop)\n", + "carnot=abs(ta/(t0-ta))\n", + "rel=abs(cop/carnot)\n", + "mass=200/Qa\n", + "C=mass*v\n", + "#results\n", + "print '%s %.1f %s' %(\"Work done =\",Wcd,\"Btu/lbm\")\n", + "print '%s %.3f %s' %(\"\\n horsepower required per ton of refrigeration =\",hp,\" hp/ton refrigeration\")\n", + "print '%s %.2f' %(\"\\n Coefficient of performance actual = \",cop)\n", + "print '%s %.3f' %(\"\\n Ideal cop = \",carnot)\n", + "print '%s %.3f' %(\"\\n relative efficiency =\",rel)\n", + "print '%s %.3f %s' %(\"\\n Mass flow rate =\",mass,\"lbm/min ton\")\n", + "print '%s %.2f %s' %(\"\\n Compressor capacity =\",C,\"cfm/ton\")\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Work done = -100.1 Btu/lbm\n", + "\n", + " horsepower required per ton of refrigeration = 0.994 hp/ton refrigeration\n", + "\n", + " Coefficient of performance actual = 4.74\n", + "\n", + " Ideal cop = 5.737\n", + "\n", + " relative efficiency = 0.826\n", + "\n", + " Mass flow rate = 0.422 lbm/min ton\n", + "\n", + " Compressor capacity = 3.44 cfm/ton\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 4 - Pg 355" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#calculate the Pressure ratio, Heat, Water make up required and Volume of vapor entering ejector\n", + "#Initialization of variables\n", + "pc=0.6982 #psia\n", + "pe=0.1217 #psia\n", + "m=200 #gal/min\n", + "qual=0.98\n", + "h1=23.07 #Btu/lbm\n", + "h2=8.05 #Btu/lbm\n", + "hw=1071.3\n", + "#calculations\n", + "rp=pc/pe\n", + "m2=m/0.01602 *0.1388 #Conversion of units \n", + "m2=1670\n", + "dh=15.02\n", + "Qa=m2*(h1-h2)\n", + "h3=h2 + qual*hw\n", + "m3=Qa/(h3-h1)\n", + "v=0.016+ qual*2444\n", + "C=m3*v\n", + "#results\n", + "print '%s %.2f' %(\"Pressure ratio =\",rp)\n", + "print '%s %d %s' %(\"\\n Heat =\",Qa,\"Btu/min\")\n", + "print '%s %.2f %s' %(\"\\n Water make up required =\",m3,\"lbm/min\")\n", + "print '%s %d %s' %(\"\\n Volume of vapor entering ejector =\",C,\"cfm\")\n", + "print '%s' %(\"The answers are a bit different due to rounding off error in textbook\")" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Pressure ratio = 5.74\n", + "\n", + " Heat = 25083 Btu/min\n", + "\n", + " Water make up required = 24.24 lbm/min\n", + "\n", + " Volume of vapor entering ejector = 58054 cfm\n", + "The answers are a bit different due to rounding off error in textbook\n" + ] + } + ], + "prompt_number": 1 + } + ], + "metadata": {} + } + ] +} \ No newline at end of file -- cgit