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-{

- "metadata": {

-  "name": "",

-  "signature": "sha256:eaab49a206212133280afcf75d94d2c8dc077f30ee178c5c537c49bf39ade08a"

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "Chapter7:THE SECOND LAW OF THERMODYNAMICS"

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Ex7.1:pg-241"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#example 1\n",

-      "#rate of fuel consumption\n",

-      "\n",

-      "W=136*0.7355 #output of automobile engine in kW\n",

-      "neng=0.3 #thermal efficiency of automobile engine\n",

-      "Qh=W/neng #energy output of fuel in kW\n",

-      "Q1=Qh-W #total rate of energy rejected to the ambient\n",

-      "qh=35000.0 #energy output of fuel in kJ/kg\n",

-      "m=Qh/qh #rate of fuel consumption in kg/s\n",

-      "print\"\\n hence,total rate of energy rejected is\",round(Q1),\"kW\" \n",

-      "print\"\\n and rate of fuel consumption is\",round(m,4),\"kg/s\""

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "\n",

-        " hence,total rate of energy rejected is 233.0 kW\n",

-        "\n",

-        " and rate of fuel consumption is 0.0095 kg/s\n"

-       ]

-      }

-     ],

-     "prompt_number": 12

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Ex7.2:pg-243"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#example 2\n",

-      "#coefficient of performance of refrigerator\n",

-      "\n",

-      "Qh=400 #heat rejected to kitchen air in W\n",

-      "W=150.0 #electrical input power in W\n",

-      "Q1=Qh-W #rate of energy taken out to cold space in W\n",

-      "B=Ql/W #coefficicent of performnace of refrigerator\n",

-      "print\"\\n hence,rate of energy taken out of the cold space is\",round(Q1),\"W\"\n",

-      "print\"\\n and coefficient of performance of the refrigerator is\",round(B,2),"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "\n",

-        " hence,rate of energy taken out of the cold space is 250.0 W\n",

-        "\n",

-        " and coefficient of performance of the refrigerator is 1.67\n"

-       ]

-      }

-     ],

-     "prompt_number": 22

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Ex7.4:pg-260"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#example 4\n",

-      "#comparison of ideal carnot heat engine with actual heat engine\n",

-      "\n",

-      "Qh=1000.0 #rate of heat transfer to heat engine in kW\n",

-      "W=450.0 #rate of production of work in kW\n",

-      "Ql=Qh-W #rate of heat rejected by heat engine in kW\n",

-      "nthermal=W/Qh #efficiency from the definition of efficiency\n",

-      "Tl=300 #temperature of surroundings in K\n",

-      "Th=550.0 #temperature of heat source in Celsius\n",

-      "ncarnot=1-Tl/(Th+273.15) #efficiency if heat engine is considered to be ideal carnot heat engine\n",

-      "W2=ncarnot*Qh #rate of work production if heat engine is assumed to be ideal carnot heat engine in kW\n",

-      "Q12=Qh-W2 #rate of heat rejected by heat engine in kW if heat engine is assumed to be ideal carnot heat engine\n",

-      "print\"\\n hence,energy discarded to the ambient surroundings iS\",round(Q12,4),\"kw\"\n",

-      "print\"\\n and the engine efficiency is\",round(ncarnot,4),"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "\n",

-        " hence,energy discarded to the ambient surroundings iS 364.4536 kw\n",

-        "\n",

-        " and the engine efficiency is 0.6355\n"

-       ]

-      }

-     ],

-     "prompt_number": 53

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Ex7.5:pg-261"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#example 5\n",

-      "#calculating required work\n",

-      "\n",

-      "Tl=24+273.15 #room temperature in Kelvins\n",

-      "Th=35+273.15 #atmospheric temperature in Kelvins\n",

-      "Ql=4 #rate of heat rejection from room\n",

-      "B=Tl/(Th-Tl) #coefficient of performance of air conditioner\n",

-      "W=Ql/B #required work in kW\n",

-      "print\"\\n hence,the magnitude of reqiured work is\",round(W,2),\"kw\""

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "\n",

-        " hence,the magnitude of reqiured work is 0.15 kw\n"

-       ]

-      }

-     ],

-     "prompt_number": 40

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [],

-     "language": "python",

-     "metadata": {},

-     "outputs": []

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
\ No newline at end of file