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authorkinitrupti2017-05-12 18:40:35 +0530
committerkinitrupti2017-05-12 18:40:35 +0530
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tree9806b0d68a708d2cfc4efc8ae3751423c56b7721 /Elements_of_Thermodynamics_and_heat_transfer/Chapter_15.ipynb
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-{
- "metadata": {
- "name": "",
- "signature": "sha256:d49c3ebbe462c89b25518f64eebe9040738bf2ef82ee8e4dec85ee0229afc06b"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter 15 - Vapor cycles and processes"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 1 - Pg 276"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate the Thermal efficiency and Furnace efficiency\n",
- "#Initialization of variables\n",
- "p1=600. #psia\n",
- "p2=0.2563 #psia\n",
- "t1=486.21 #F\n",
- "t2=60. #F\n",
- "fur=0.75\n",
- "#calculations\n",
- "print '%s' %(\"from steam tables,\")\n",
- "h1=1203.2\n",
- "hf1=471.6\n",
- "hfg1=731.6\n",
- "h2=1088\n",
- "hf2=28.06\n",
- "hfg2=1059.9\n",
- "s1=1.4454\n",
- "sf1=0.6720\n",
- "sfg1=0.7734\n",
- "s2=2.0948\n",
- "sf2=0.0555\n",
- "sfg2=2.0393\n",
- "xd=(s1-sf2)/sfg2\n",
- "hd=hf2+xd*hfg2\n",
- "xa=0.3023\n",
- "ha=hf2+xa*hfg2\n",
- "wbc=0\n",
- "wda=0\n",
- "wcd=h1-hd\n",
- "wab=ha-hf1\n",
- "W=wab+wcd+wbc+wda\n",
- "Wrev=hfg1- (t2+459.7)*sfg1\n",
- "etat=(t1-t2)/(t1+459.7)*100\n",
- "eta=fur*etat\n",
- "#results\n",
- "print '%s %d %s' %(\"Thermal efficiency =\",etat,\"percent\")\n",
- "print '%s %.1f %s' %(\"\\n Furnace efficiency =\",eta,\" percent\")\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "from steam tables,\n",
- "Thermal efficiency = 45 percent\n",
- "\n",
- " Furnace efficiency = 33.8 percent\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 2 - Pg 277"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate the Thermal and Overall efficiency\n",
- "#Initialization of variables\n",
- "dhab=-123.1\n",
- "etac=0.5\n",
- "ha=348.5\n",
- "etaf=0.75\n",
- "eta=0.85\n",
- "hf=471.6\n",
- "hfg=731.6\n",
- "hc=1203.2\n",
- "dhcd=452.7\n",
- "#calculations\n",
- "dwabs=dhab/etac\n",
- "hbd=ha-dwabs\n",
- "dwcds=dhcd*eta\n",
- "dqa=hc-hbd\n",
- "etat=(dwcds+dwabs)/dqa*100.\n",
- "eta=etat*etaf\n",
- "#results\n",
- "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\" percent\")\n",
- "print '%s %.1f %s' %(\"\\n Overall efficiency = \",eta,\" percent\")\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Thermal efficiency = 22.8 percent\n",
- "\n",
- " Overall efficiency = 17.1 percent\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 3 - Pg 277"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate the Thermal and Overall efficiency\n",
- "#Initialization of variables\n",
- "t=60 #F\n",
- "J=778.16\n",
- "p1=600 #psia\n",
- "p2=0.2563 #psia\n",
- "etaf=0.85 \n",
- "#calculations\n",
- "print '%s' %(\"From steam tables,\")\n",
- "vf=0.01604 #ft^3/lbm\n",
- "dw=-vf*(p1-p2)*144/J\n",
- "ha=28.06 #Btu/lbm\n",
- "hb=29.84 #Btu/lbm\n",
- "hd=1203.2 #Btu/lbm\n",
- "he=750.5 #Btu/lbm\n",
- "dqa=hd-hb\n",
- "dqr=ha-he\n",
- "dw=dqa+dqr\n",
- "dwturb=hd-he\n",
- "dwpump=ha-hb\n",
- "etat=dw/dqa*100.\n",
- "eta=etat*etaf\n",
- "#results\n",
- "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\" percent\")\n",
- "print '%s %.1f %s' %(\"\\n Overall efficiency =\",eta,\"percent\")\n",
- " \n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "From steam tables,\n",
- "Thermal efficiency = 38.4 percent\n",
- "\n",
- " Overall efficiency = 32.7 percent\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 4 - Pg 278"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate the Thermal and Overall efficiency\n",
- "#Initialization of variables\n",
- "dhab=-1.78\n",
- "etac=0.5\n",
- "ha=28.06\n",
- "eta=0.85\n",
- "hf=471.6\n",
- "hfg=731.6\n",
- "hd=1203.2\n",
- "dhcd=452.7\n",
- "#calculations\n",
- "dwabs=dhab/etac\n",
- "hbd=ha-dwabs\n",
- "dwcds=dhcd*eta\n",
- "dqa=hd-hbd\n",
- "etat=(dwcds+dwabs)/dqa*100.\n",
- "eta=etat*eta\n",
- "#results\n",
- "print '%s %.1f %s' %(\"Thermal efficiency =\",etat,\"percent\")\n",
- "print '%s %.1f %s' %(\"\\n Overall efficiency =\",eta,\"percent\")\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Thermal efficiency = 32.5 percent\n",
- "\n",
- " Overall efficiency = 27.7 percent\n"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example 5 - Pg 287"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate the thermal efficiency\n",
- "#Initialization of variables\n",
- "p2=600 #psia\n",
- "p1=44 #psia\n",
- "te=486.21 #F\n",
- "tb=273.1 #F\n",
- "J=778.16\n",
- "p3=0.25 #psia\n",
- "#calculations\n",
- "hc=241.9\n",
- "hj=834.6\n",
- "y=1-0.805\n",
- "v1=0.0172\n",
- "v2=0.016\n",
- "ha=28.06\n",
- "hd=hc+v1*(p2-p1)*144/J\n",
- "hb=ha+v2*(p1-p3)*144/J\n",
- "hh=1374\n",
- "Qa=hh-hd\n",
- "Qr=(ha-hj)*(1-y)\n",
- "etat=(Qa+Qr)/Qa*100.\n",
- "#results\n",
- "print '%s %.1f %s' %(\"thermal efficiency =\",etat,\"percent\")\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "thermal efficiency = 42.6 percent\n"
- ]
- }
- ],
- "prompt_number": 5
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file