{
"cells": [
 {
		   "cell_type": "markdown",
	   "metadata": {},
	   "source": [
       "# Chapter 8: Second and Third law topics"
	   ]
	},
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 8.1: PvsS_calculatio.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"clc\n",
"clear\n",
"//Initialization of variables\n",
"P=500 //psia\n",
"T=700 //F\n",
"J=778\n",
"//calculations\n",
"dpds=1490 *144/J\n",
"//results\n",
"printf('dp by ds at constant volume = %d F/ft^3/lbm',dpds)\n",
"disp('The answer is a bit different due to rounding off error in textbook')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 8.2: Thermal_efficiency_calculation.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"clc\n",
"clear\n",
"//Initialization of variables\n",
"cp=0.25 //Btu/lbm R\n",
"T0=520 //R\n",
"T1=3460 //R\n",
"//calculations\n",
"dq=cp*(T0-T1)\n",
"ds=cp*log(T0/T1)\n",
"dE=dq-T0*ds\n",
"eta=dE/dq\n",
"//results\n",
"printf('Thermal efficiency = %.1f percent',eta*100)"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 8.3: Loss_of_available_energy_calculation.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"clc\n",
"clear\n",
"//Initialization of variables\n",
"cp=0.25 //Btu/lbm R\n",
"T0=520 //R\n",
"T1=3460 //R\n",
"dG=21069 //Btu/lbm\n",
"dH=21502 //Btu/lbm\n",
"//calculations\n",
"dq=cp*(T0-T1)\n",
"ds=cp*log(T0/T1)\n",
"dE=dq-T0*ds\n",
"eta=dE/dq\n",
"dw=eta*dH\n",
"de=-dG+dw\n",
"//results\n",
"printf('Loss of available energy = %d Btu/lbm',de)\n",
"disp('The answer is a bit different due to rounding off error in textbook')"
   ]
   }
],
"metadata": {
		  "kernelspec": {
		   "display_name": "Scilab",
		   "language": "scilab",
		   "name": "scilab"
		  },
		  "language_info": {
		   "file_extension": ".sce",
		   "help_links": [
			{
			 "text": "MetaKernel Magics",
			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
			}
		   ],
		   "mimetype": "text/x-octave",
		   "name": "scilab",
		   "version": "0.7.1"
		  }
		 },
		 "nbformat": 4,
		 "nbformat_minor": 0
}