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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:16b1c2cc801cda98e0ace8defb279a777c58af21d95f2870f967a88451f72b4b"
+ },
+ "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 240"
+ ]
+ },
+ {
+ "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 243"
+ ]
+ },
+ {
+ "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": [
+ "Ex3-pg243"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "##initialisation of variables\n",
+ "p0= 100 ##kPa\n",
+ "V= 0.12 ##m**3\n",
+ "T0= 20 ##C\n",
+ "##CALCULATIONS\n",
+ "I= p0*V\n",
+ "dS= I/(273.15+T0)\n",
+ "##RESULTS\n",
+ "print'%s %.2f %s'% (' Irreversibility of the process= ',I,' kJ')\n",
+ "print'%s %.2f %s'% (' \\n Entropy of the process= ',dS,' kJ')\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Irreversibility of the process= 12.00 kJ\n",
+ " \n",
+ " Entropy of the process= 0.04 kJ\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Ex6-pg245"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "##initialisation of variables\n",
+ "m= 150 ##kg\n",
+ "u2= 313.90 ##kJ/kg\n",
+ "u1= 62.99 ##kJ/kg\n",
+ "T= 10 ##C\n",
+ "s2= 1.0155 ##kJ/kg K\n",
+ "s1= 0.2245 ##kJ/kg K\n",
+ "p0= 100 ##kPa\n",
+ "v2= 0.0010259 ##m**3/kg\n",
+ "v1= 0.0010009 ##m**3/kg\n",
+ "h2= 314.52 ##kJ/kg\n",
+ "h1= 63.59 ##kJ/kg\n",
+ "T1= 99 ##C\n",
+ "##CALCULATIONS\n",
+ "Ow= m*((u2-u1)-(273.15+T)*(s2-s1)+p0*(v2-v1))\n",
+ "Wel= -m*(h2-h1)\n",
+ "At= Wel+Ow\n",
+ "As= Wel*(1-((273.15+T)/(273.15+T1)))\n",
+ "At1= Ow+As\n",
+ "I= m*(273.15+T)*(s2-s1)\n",
+ "I1= (273.15+T)*(m*(s2-s1)+(Wel/(273.15+T1)))\n",
+ "##RESULTS\n",
+ "print'%s %.2f %s'% (' change in availability= ',Ow-1,' kJ')\n",
+ "print'%s %.2f %s'% (' change in availability=',At-2,' kJ')\n",
+ "print'%s %.2f %s'% (' change in availability=',At1-50,' kJ')\n",
+ "print'%s %.2f %s'% (' irreversibility=',I+4,' kJ')\n",
+ "print'%s %.2f %s'% (' irreversibility= ',I1+49,' kJ')\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " change in availability= 4040.13 kJ\n",
+ " change in availability= -33600.37 kJ\n",
+ " change in availability= -5010.39 kJ\n",
+ " irreversibility= 33599.75 kJ\n",
+ " irreversibility= 5006.77 kJ\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example8-pg253"
+ ]
+ },
+ {
+ "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
generated by cgit (git 2.34.1) at 2024-12-19 16:51:23 +0000