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-{
- "metadata": {
- "name": "",
- "signature": "sha256:2af45763cdabb4c15384bcd3c0f85ef0384f4698a0a51376cf62b1a662fc76dc"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 1,
- "metadata": {},
- "source": [
- "Chapter10-Availbility,exergy and irreversibilitiy"
- ]
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example1-pg 180"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "import math\n",
- "#calculate work of the water and heat interaction of the water and aximum work done\n",
- "##initialisation of variables\n",
- "m= 2 ##kg\n",
- "p= 200 ##kPa\n",
- "v2= 0.9596 ##m^3/kg\n",
- "v1= 0.001 ##m^3/kg\n",
- "u2= 2768.8 ##kJ/kg\n",
- "u1= 83.96 ##kJ/kg\n",
- "T= 20 ##C\n",
- "u3= 2576.9 ##kJ/kg\n",
- "s2= 7.2795 ##kJ/kg K\n",
- "s1= 0.2966 ##kJ/kg K\n",
- "Tr= 150 ##C\n",
- "##CALCULATIONS\n",
- "W= m*p*(v2-v1)\n",
- "Q= m*(u2-u1)\n",
- "A= m*((u3-u1)-(273.15+T)*(s2-s1))\n",
- "Ar= -Q*(1-((273.15+T)/(273.15+Tr)))\n",
- "Wrep= -(A+Ar)\n",
- "##RESULTS\n",
- "print'%s %.1f %s'%('work of the water =',W,'kJ')\n",
- "print'%s %.1f %s'% ('Heat interaction of the water =',Q,'kJ')\n",
- "print'%s %.1f %s'%('maximum work done =',Wrep,'kJ')\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "work of the water = 383.4 kJ\n",
- "Heat interaction of the water = 5369.7 kJ\n",
- "maximum work done = 757.9 kJ\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example2-pg 182"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "import math\n",
- "#calculate irreversibility of the processes\n",
- "##initialisation of variables\n",
- "Wrev= 757.8 ##kJ\n",
- "W= 383.4 ##kJ\n",
- "m= 2 ##kg\n",
- "s2= 7.2795 ##kJ/kg K\n",
- "s1= 0.2966 ##kJ/kg K\n",
- "Qr= 5369.7 ##kJ\n",
- "T= 150 ##C\n",
- "T0= 20 ##C\n",
- "##CALCULATIONS\n",
- "I= Wrev-W\n",
- "dS= m*(s2-s1)\n",
- "Sr= -Qr/(273.15+T)\n",
- "I1= (273.15+T0)*(dS+Sr)\n",
- "##RESULTS\n",
- "print'%s %.1f %s'%('Irreversibility of the process=',I1,'kJ')\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Irreversibility of the process= 374.1 kJ\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Example7-pg192"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "#calculate mass flow rates and wmax and irreversibility\n",
- "import math\n",
- "##initialisation of variables\n",
- "h3= 2793.2 ##kJ/kg\n",
- "h2= 1342.3 ##kJ/kg\n",
- "h1= 2993.5 ##kJ/kg\n",
- "m3= 2.5 ##kg/s\n",
- "b1= 1043.9 ##kJ/kg\n",
- "b2= 374.24 ##kJ/kg\n",
- "b3= 875.41 ##kJ/kg\n",
- "##CALCULATIONS\n",
- "m1= m3*((h3-h2)/(h1-h2))\n",
- "m2= m3*((h3-h1)/(h2-h1))\n",
- "Bin= (m1*b1+m2*b2)\n",
- "Bout= m3*b3\n",
- "B= Bin-Bout\n",
- "Wmax= B\n",
- "I= B\n",
- "##RESULTS\n",
- "print'%s %.3f %s'%('mass flow rate=',m1,'kg/s')\n",
- "print'%s %.3f %s'%('mass flow rate=',m2,'kg/s')\n",
- "print'%s %.3f %s'%('Wmax=',Wmax,'kg/s')\n",
- "print'%s %.1f %s'%('Irreversibility=',Wmax,'kW')\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "mass flow rate= 2.197 kg/s\n",
- "mass flow rate= 0.303 kg/s\n",
- "Wmax= 218.141 kg/s\n",
- "Irreversibility= 218.1 kW\n"
- ]
- }
- ],
- "prompt_number": 7
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file