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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:1e66a4aaf6aa5b1578af922356299d8af3b4aded7460ea4a450b6cc816355a1b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 06:Second Law of Thermodynamics"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.1:pg-138"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "T1 = 800 # Source temperature in degree Celsius\n",
+ "\n",
+ "T2 = 30 # Sink temperature in degree Celsius\n",
+ "\n",
+ "e_max = 1-((T2+273)/(T1+273)) # maximum possible efficiency \n",
+ "\n",
+ "Wnet = 1 # in kW\n",
+ "\n",
+ "Q1 = Wnet/e_max # Least rate of heat required in kJ/s\n",
+ "\n",
+ "Q2 = Q1-Wnet # Least rate of heat rejection kJ/s\n",
+ "\n",
+ "\n",
+ "\n",
+ "print \"\\n Example 6.1\"\n",
+ "\n",
+ "print \"\\n Least rate of heat rejection is \",Q2,\" kW\"\n",
+ "\n",
+ "#The answers vary due to round off error\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.1\n",
+ "\n",
+ " Least rate of heat rejection is 0 kW\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.2:pg-139"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "T1 = -15 # Source temperature in degree Celsius\n",
+ "\n",
+ "T2 = 30 # Sink temperature in degree Celsius\n",
+ "\n",
+ "Q2 = 1.75 # in kJ/sec\n",
+ "\n",
+ "print \"\\n Example 6.2\"\n",
+ "\n",
+ "W= Q2*((T2+273)-(T1+273))/(T1+273) # Least Power necessary to pump the heat out\n",
+ "\n",
+ "print \"\\n Least Power necessary to pump the heat out is \",round(W,2),\"kW\"\n",
+ " \n",
+ " #The answers vary due to round off error\n",
+ " \n",
+ " "
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.2\n",
+ "\n",
+ " Least Power necessary to pump the heat out is 0.31 kW\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.3:pg-140"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Given \n",
+ "\n",
+ "T1 = 600 # Source temperature of heat engine in degree Celsius\n",
+ "\n",
+ "T2 = 40 # Sink temperature of heat engine in degree Celsius \n",
+ "\n",
+ "T3 = -20 # Source temperature of refrigerator in degree Celsius\n",
+ "\n",
+ "Q1 = 2000 # Heat transfer to heat engine in kJ\n",
+ "\n",
+ "W = 360 # Net work output of plant in kJ\n",
+ "\n",
+ "# Part (a)\n",
+ "\n",
+ "e_max = 1.0-((T2+273)/(T1+273)) # maximum efficiency \n",
+ "\n",
+ "W1 = e_max*Q1 # maximum work output \n",
+ "\n",
+ "COP = (T3+273)/((T2-273)-(T3-273)) # coefficient of performance of refrigerator\n",
+ "\n",
+ "W2 = W1-W # work done to drive refrigerator \n",
+ "\n",
+ "Q4 = COP*W2 # Heat extracted by refrigerator\n",
+ "\n",
+ "Q3 = Q4+W2 # Heat rejected by refrigerator\n",
+ "\n",
+ "Q2 = Q1-W1 # Heat rejected by heat engine\n",
+ "\n",
+ "Qt = Q2+Q3 # combined heat rejection by heat engine and refrigerator \n",
+ "\n",
+ "print \"\\n Example 6.3\"\n",
+ "\n",
+ "print \"\\n\\n Part A:\"\n",
+ "\n",
+ "print \"\\n The heat transfer to refrigerant is \",round(Q2,3) ,\" kJ\"\n",
+ "\n",
+ "print \"\\n The heat rejection to the 40 degree reservoir is \",round(Qt,3) ,\" kJ\"\n",
+ "\n",
+ "\n",
+ "\n",
+ "# Part (b)\n",
+ "\n",
+ "print \"\\n\\n Part B:\"\n",
+ "\n",
+ "e_max_ = 0.4*e_max # maximum efficiency\n",
+ "\n",
+ "W1_ = e_max_*Q1 # maximum work output \n",
+ "\n",
+ "W2_ = W1_-W # work done to drive refrigerator \n",
+ "\n",
+ "COP_ = 0.4*COP # coefficient of performance of refrigerator\n",
+ "\n",
+ "Q4_ = COP_*W2_ # Heat extracted by refrigerator\n",
+ "\n",
+ "Q3_ = Q4_+W2_ # Heat rejected by refrigerator\n",
+ "\n",
+ "Q2_ = Q1-W1_ # Heat rejected by heat engine\n",
+ "\n",
+ "QT = Q2_+Q3_# combined heat rejection by heat engine and refrigerator \n",
+ "\n",
+ "print \"\\n The heat transfer to refrigerant is \",round(Q2_,3) ,\" kJ\"\n",
+ "\n",
+ "print \"\\n The heat rejection to the 40 degree reservoir is \",round(QT,3) ,\" kJ\"\n",
+ "\n",
+ "#The answers vary due to round off error\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.3\n",
+ "\n",
+ "\n",
+ " Part A:\n",
+ "\n",
+ " The heat transfer to refrigerant is 0.0 kJ\n",
+ "\n",
+ " The heat rejection to the 40 degree reservoir is 8200.0 kJ\n",
+ "\n",
+ "\n",
+ " Part B:\n",
+ "\n",
+ " The heat transfer to refrigerant is 1200.0 kJ\n",
+ "\n",
+ " The heat rejection to the 40 degree reservoir is 2344.0 kJ\n"
+ ]
+ }
+ ],
+ "prompt_number": 14
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.5:pg-142"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "T1 = 473 # Boiler temperature in K\n",
+ "\n",
+ "T2 = 293 # Home temperature in K\n",
+ "\n",
+ "T3 = 273 # Outside temperature in K\n",
+ "\n",
+ "print \"\\n Example 6.5\"\n",
+ "\n",
+ "MF = (T2*(T1-T3))/(T1*(T2-T3)) \n",
+ "\n",
+ "print \"\\n The multiplication factor is \",MF \n",
+ "\n",
+ "#The answers vary due to round off error\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.5\n",
+ "\n",
+ " The multiplication factor is 6\n"
+ ]
+ }
+ ],
+ "prompt_number": 15
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.6:pg-144"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "T1 = 90.0 # Operating temperature of power plant in degree Celsius \n",
+ "\n",
+ "T2 = 20.0 # Atmospheric temperature in degree Celsius\n",
+ "\n",
+ "W = 1.0 # Power production from power plant in kW\n",
+ "\n",
+ "E = 1880 # Capability of energy collection in kJ/m**2 h\n",
+ "\n",
+ "\n",
+ "\n",
+ "print \"\\n Example 6.6\"\n",
+ "\n",
+ "e_max = 1.0-((T2+273.0)/(T1+273.0)) # maximum efficiency\n",
+ "\n",
+ "Qmin = W/e_max # Minimum heat requirement per second\n",
+ "\n",
+ "Qmin_ = Qmin*3600.0 # Minimum heat requirement per hour\n",
+ "\n",
+ "Amin = Qmin_/E # Minimum area requirement\n",
+ "\n",
+ "print \"\\n Minimum area required for the collector plate is \",math. ceil(Amin) ,\" m**2\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.6\n",
+ "\n",
+ " Minimum area required for the collector plate is 10.0 m**2\n"
+ ]
+ }
+ ],
+ "prompt_number": 21
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Ex6.7:pg-144"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "T1 = 1000 # Temperature of hot reservoir in K\n",
+ "\n",
+ "W = 1000 # Power requirement in kW\n",
+ "\n",
+ "K = 5.67e-08 # constant \n",
+ "\n",
+ "print \"\\n Example 6.7\"\n",
+ "\n",
+ "Amin = (256*W)/(27*K*T1**4) # minimum area required\n",
+ "\n",
+ "print \"\\n Area of the panel \",Amin ,\" m**2\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ " Example 6.7\n",
+ "\n",
+ " Area of the panel 0.167221895617 m**2\n"
+ ]
+ }
+ ],
+ "prompt_number": 23
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
generated by cgit (git 2.34.1) at 2025-04-01 03:49:29 +0000