<?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>S0035-001X2008000400004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[On the optimum operation conditions of an endoreversible heat engine with different heat transfer laws in the thermal couplings]]></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 contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Salas]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Brown]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Cómputo Departamento de Ciencias Básicas]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas Departamento de Física]]></institution>
<addr-line><![CDATA[ D.F]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>4</numero>
<fpage>284</fpage>
<lpage>292</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000400004&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 optimum operating conditions of an endoreversible engine model. In this model we consider different heat transfer modes from the hot reservoir to the working fluid, while the mode of heat transfer from the working fluid to the cold reservoir is governed by a Newtonian heat transfer law. In our analysis we use two modes of performance, the maximum power regimen and the so-called ecological function. We calculate the optimum temperatures of the working fluid and the optimum efficiency in terms of the relevant system parameters. We show how the efficiency under a maximum ecological function is greater than the maximum efficiency under maximum power conditions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Dentro del contexto de la Termodinámica de Tiempos Finitos (TTF) se estudian las condiciones de operación óptima de un modelo de máquina térmica endorreversible. En el modelo se consideran diferentes modos de transferencia de calor del almacén caliente a la sustancia de trabajo, mientras que la transferencia de energía de la sustancia de trabajo al almacén frío está dominada principalmente por una ley de enfriamiento tipo Newton. En nuestro estudio consideramos dos regímenes de operación, el de máxima potencia y el de máxima función ecológica. Calculamos las temperaturas óptimas de la sustancia de trabajo, así como la eficiencia óptima de la máquina térmica en función de parámetros representativos del modelo. Se muestra que la eficiencia óptima bajo un régimen de operación ecológica es siempre mayor que la correspondiente eficiencia bajo un régimen de operación de máxima potencia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Finite time-thermodynamics]]></kwd>
<kwd lng="en"><![CDATA[endoreversible engine]]></kwd>
<kwd lng="en"><![CDATA[optimization]]></kwd>
<kwd lng="es"><![CDATA[Termodinámica de tiempos finitos]]></kwd>
<kwd lng="es"><![CDATA[máquina endorreversible]]></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>On the optimum operation conditions of an endoreversible heat engine with different heat transfer laws in the thermal couplings</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M.A. Barranco&#150;Jim&eacute;nez&ordf;, N. S&aacute;nchez&#150;Salas<sup>b</sup> and F. Angulo&#150;Brown<sup>b</sup></b></font></p>     <p align="center"><strong><font face="verdana" size="2">&nbsp;</font></strong></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Departamento de Ciencias B&aacute;sicas, Escuela Superior de C&oacute;mputo, Instituto Polit&eacute;cnico Nacional, Av. Juan de Dios Batiz s/n. Esq. M. Othon de Mendizabal, UP Adolfo L&oacute;pez Mateos, 07738, M&eacute;xico D.F., </i>e&#150;mail: <a href="mailto:mbarrancoj@ipn.mx">mbarrancoj@ipn.mx</a></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de F&iacute;sica, Escuela Superior de F&iacute;sica y Matem&aacute;ticas, Instituto Polit&eacute;cnico Nacional, UP Zacatenco, 07738 M&eacute;xico D.F, </i>e&#150;mail: <a href="mailto:norma@esfm.ipn.mx">norma@esfm.ipn.mx</a>, <a href="mailto:angulo@esfm.ipn.mx">angulo@esfm.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 septiembre de 2007    ]]></body>
<body><![CDATA[<br> Aceptado el 3 de junio de 2008</font></p>     <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 optimum operating conditions of an endoreversible engine model. In this model we consider different heat transfer modes from the hot reservoir to the working fluid, while the mode of heat transfer from the working fluid to the cold reservoir is governed by a Newtonian heat transfer law. In our analysis we use two modes of performance, the maximum power regimen and the so&#150;called ecological function. We calculate the optimum temperatures of the working fluid and the optimum efficiency in terms of the relevant system parameters. We show how the efficiency under a maximum ecological function is greater than the maximum efficiency under maximum power conditions.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Finite time&#150;thermodynamics; endoreversible engine; 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) se estudian las condiciones de operaci&oacute;n &oacute;ptima de un modelo de m&aacute;quina t&eacute;rmica endorreversible. En el modelo se consideran diferentes modos de transferencia de calor del almac&eacute;n caliente a la sustancia de trabajo, mientras que la transferencia de energ&iacute;a de la sustancia de trabajo al almac&eacute;n fr&iacute;o est&aacute; dominada principalmente por una ley de enfriamiento tipo Newton. En nuestro estudio consideramos dos reg&iacute;menes de operaci&oacute;n, el de m&aacute;xima potencia y el de m&aacute;xima funci&oacute;n ecol&oacute;gica. Calculamos las temperaturas &oacute;ptimas de la sustancia de trabajo, as&iacute; como la eficiencia &oacute;ptima de la m&aacute;quina t&eacute;rmica en funci&oacute;n de par&aacute;metros representativos del modelo. Se muestra que la eficiencia &oacute;ptima bajo un r&eacute;gimen de operaci&oacute;n ecol&oacute;gica es siempre mayor que la correspondiente eficiencia bajo un r&eacute;gimen de operaci&oacute;n de m&aacute;xima potencia.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Termodin&aacute;mica de tiempos finitos; m&aacute;quina endorreversible; optimizaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 44.90,+c</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v54n4/v54n4a4.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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was supported in part by 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>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. F. Curzon and B. Ahlborn, <i>Am J. 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