<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2009000300008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Finite-time thermoeconomic optimization of a non endoreversible heat engine model]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barranco-Jiménez]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Escuela Superior de Cómputo del IPN Departamento de Ciencias Básicas ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2009</year>
</pub-date>
<volume>55</volume>
<numero>3</numero>
<fpage>211</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2009000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2009000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2009000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Within the context of Finite-Time Thermodynamics (FTT), we study the thermoeconomics of a simplified non-endoreversible thermal power plant model (the so-called Novikov engine). In our study, we use different heat transfer laws: the so called Newton's law of cooling, the Stefan-Boltzmann radiation law, the Dulong-Petit's law and another phenomenological heat transfer law. We use two FTT optimization criteria: the maximum power regime (MP) and the so-named modified ecological criterion for performance analysis. This last criterion leads the engine model towards a mode of performance that appreciably diminishes the engine's wasted energy. It is shown that under ecological conditions the plant dramatically reduces the amount of heat rejected to the environment, and a loss of profit is translated into a better usage of fuel such that the heat rejected towards the environment is remarkably reduced compared to that of a maximum power regime. Besides, we analyze the effect on the reduction of power output and the optimal efficiencies in terms of an internal irreversibility parameter that comes from the Clausius inequality which characterizes the degree of internal irreversibility.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Dentro del contexto de la Termodinámica de Tiempos Finitos (TTF) estudiamos la termoeconomia de un modelo simplificado no endor-reversible de planta de potencia. (modelo de Novikov). En nuestro estudio, usamos diferentes leyes de transferencia de calor: Ley de enfriamiento de Newton, ley de radiación de Stefan-Boltzmann, ley de Dulong-Petit y una ley fenómenológica de transferencia de calor. Usamos dos criterios de optimizacion: régimen de operación de Máxima Potencia y el así llamado criterio de operación de máxima Función Ecológica modificada. Este último criterio proporciona un modo de operación que apreciablemente disminuye la energía disipada por la maquina térmica. En este trabajo mostramos bajo condiciones de operación de máxima Función Ecológica que la pérdida en beneficios se ve compensada por un mejor uso en el combustible de modo que la planta de potencia reduce dramaticamente la cantidad de energía disipada al medio ambiente con respecto a la cantidad de energía bajo un regimen de operación de Máxima Potencia. También analizamos el efecto sobre la potencia de salida y la eficiencia del modelo de planta de potencia en términos de un parámetro de irreversibilidad interna que proviene de la desigualdad de Clausius, el cual caracteriza el grado de irreversibilidad interna.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Thermoeconomics]]></kwd>
<kwd lng="en"><![CDATA[endoreversible cycles]]></kwd>
<kwd lng="en"><![CDATA[optimization]]></kwd>
<kwd lng="es"><![CDATA[Termo-economía]]></kwd>
<kwd lng="es"><![CDATA[ciclos térmicos endorreversibles]]></kwd>
<kwd lng="es"><![CDATA[optimización]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Finite&#150;time thermoeconomic optimization of a non endoreversible heat engine model</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M.A. Barranco&#150;Jim&eacute;nez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Departamento de Ciencias B&aacute;sicas, Escuela Superior de C&oacute;mputo del IPN, Av. Juan de Dios Batiz s/n. Esq. Miguel Ot&oacute;n de Mendiz&aacute;bal, Col. Lindavista. M&eacute;xico D.F., 07738, M&eacute;xico, </i>e&#150;mail: <a href="mailto:mbarrancoj@ipn.mx">mbarrancoj@ipn.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 17 de febrero de 2009    <br> Aceptado el 25 de mayo de 2009</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Within the context of Finite&#150;Time Thermodynamics (FTT), we study the thermoeconomics of a simplified non&#150;endoreversible thermal power plant model (the so&#150;called Novikov engine). In our study, we use different heat transfer laws: the so called Newton's law of cooling, the Stefan&#150;Boltzmann radiation law, the Dulong&#150;Petit's law and another phenomenological heat transfer law. We use two FTT optimization criteria: the maximum power regime (MP) and the so&#150;named modified ecological criterion for performance analysis. This last criterion leads the engine model towards a mode of performance that appreciably diminishes the engine's wasted energy. It is shown that under ecological conditions the plant dramatically reduces the amount of heat rejected to the environment, and a loss of profit is translated into a better usage of fuel such that the heat rejected towards the environment is remarkably reduced compared to that of a maximum power regime. Besides, we analyze the effect on the reduction of power output and the optimal efficiencies in terms of an internal irreversibility parameter that comes from the Clausius inequality which characterizes the degree of internal irreversibility.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Thermoeconomics; endoreversible cycles; optimization.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Dentro del contexto de la Termodin&aacute;mica de Tiempos Finitos (TTF) estudiamos la termoeconomia de un modelo simplificado no endor&#150;reversible de planta de potencia. (modelo de Novikov). En nuestro estudio, usamos diferentes leyes de transferencia de calor: Ley de enfriamiento de Newton, ley de radiaci&oacute;n de Stefan&#150;Boltzmann, ley de Dulong&#150;Petit y una ley fen&oacute;menol&oacute;gica de transferencia de calor. Usamos dos criterios de optimizacion: r&eacute;gimen de operaci&oacute;n de M&aacute;xima Potencia y el as&iacute; llamado criterio de operaci&oacute;n de m&aacute;xima Funci&oacute;n Ecol&oacute;gica modificada. Este &uacute;ltimo criterio proporciona un modo de operaci&oacute;n que apreciablemente disminuye la energ&iacute;a disipada por la maquina t&eacute;rmica. En este trabajo mostramos bajo condiciones de operaci&oacute;n de m&aacute;xima Funci&oacute;n Ecol&oacute;gica que la p&eacute;rdida en beneficios se ve compensada por un mejor uso en el combustible de modo que la planta de potencia reduce dramaticamente la cantidad de energ&iacute;a disipada al medio ambiente con respecto a la cantidad de energ&iacute;a bajo un regimen de operaci&oacute;n de M&aacute;xima Potencia. Tambi&eacute;n analizamos el efecto sobre la potencia de salida y la eficiencia del modelo de planta de potencia en t&eacute;rminos de un par&aacute;metro de irreversibilidad interna que proviene de la desigualdad de Clausius, el cual caracteriza el grado de irreversibilidad interna.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Termo&#150;econom&iacute;a; ciclos t&eacute;rmicos endorreversibles; optimizaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 44.60.+K; 44.90.+C</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf//rmf/v55n3/v55n3a8.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">The author wishes to thank Professor F. Angulo&#150;Brown for many useful discussions, Dr. R. Hern&aacute;ndez&#150;P&eacute;rez for manuscript revision and also wishes to thank the anonymous referee for critical comments on the manuscript. This work was supported in part by CONACYT, COFAA and EDI&#150;IPN&#150;M&eacute;xico.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><a href="/img/revistas/rmf/v55n3/a8s1.jpg" target="_blank">A Optimal efficiencies under both maximum power and maximum ecological conditions: Newton and Dulong&#150;Petit cases.</a></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. De Vos, <i>Energy. Convers. 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