<?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>1683-0789</journal-id>
<journal-title><![CDATA[Acta Nova]]></journal-title>
<abbrev-journal-title><![CDATA[RevActaNova.]]></abbrev-journal-title>
<issn>1683-0789</issn>
<publisher>
<publisher-name><![CDATA[Universidad Católica Boliviana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1683-07892024000100304</article-id>
<article-id pub-id-type="doi">10.35319/acta-nova.202421</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Analysis of exergetic efficiency in the storage of solar thermal energy in phase change materials (PCMs)]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de eficiencia exergética en el almacenamiento de energía solar térmica en materiales de cambio de fase (PCMs)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luján Pérez]]></surname>
<given-names><![CDATA[Marcos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Católica Boliviana "San Pablo" Departamento de Ciencias Exactas e Ingeniería Centro de Investigación de Ciencias Exactas e Ingeniería (CICEI)]]></institution>
<addr-line><![CDATA[Cochabamba ]]></addr-line>
<country>Bolivia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>304</fpage>
<lpage>317</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S1683-07892024000100304&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S1683-07892024000100304&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S1683-07892024000100304&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Renewable energy generation systems in most cases require exergy storage systems to reconcile the differences between renewable energy supply and energy demand. For this it is necessary to have exergy storage systems (not just energy), the efficiency of these systems is very important for the competitiveness of renewable energies. This work analyzes the efficiency of thermal exergy storage systems applied to solar energy use systems through CSP (Concentrated Solar Power) systems. The theoretical analysis shows that the efficiency of exergy storage depends essentially on the temperatures and the temperature differences between the source of thermal energy loading and the source of thermal energy discharge. It is also evident that the closer the system is of the ambient temperature, the lower its efficiency will be until it is practically zero, around ambient temperature. The basic strategy to reduce losses in heat transfer processes for exergy storage is to reduce the temperature difference between the elements that exchange heat. With this criterion, a heat storage system is proposed with PCM at high temperature, the maximum possible, and a combined Bryton and Rankine cycle system that would improve the efficiency of solar exergy capture in a CSP system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los sistemas de generación de energías renovables requieren en la mayoría de los casos sistemas de almacenamiento de exergía para conciliar las diferencias entre la oferta de energía renovable y la demanda de energía. Para ello es necesario contar con sistemas de almacenamiento de exergía (no solamente energía), la eficiencia de estos sistemas es muy importante para la competividad de las energías renovables. En este trabajo se analiza en particular la eficiencia de los sistemas de almacenamiento de exergía térmica aplicada a sistemas de aprovechamiento de energía solar mediante sistemas CSP (Concentrated Solar Power). El análisis teórico muestra que la eficiencia del almacenamiento de exergía depende esencialmente de las temperaturas y las diferencias de temperatura entre la fuente de carga de energía térmica y la fuente de descarga de la energía térmica, también se evidencia que mientras más cerca se encuentra el sistema de la temperatura ambiente, menor será su eficiencia hasta ser prácticamente cero, cerca de la temperatura ambiente. La estrategia básica para reducir las pérdidas en los procesos de transferencia de calor para el almacenamiento de exergía es reducir la diferencia de temperatura entre los elementos que intercambiar calor. Con este criterio se propone un sistema de almacenamiento de calor con PCM a alta temperatura, la máxima posible, y un sistema de ciclos de Bryton y Rankine combinados que permitiría mejorar la eficiencia de la captura de la exergía solar en un sistema CSP.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[exergy analysis]]></kwd>
<kwd lng="en"><![CDATA[phase change materials]]></kwd>
<kwd lng="en"><![CDATA[solar energy]]></kwd>
<kwd lng="es"><![CDATA[análisis de exergía]]></kwd>
<kwd lng="es"><![CDATA[materiales de cambio de fase]]></kwd>
<kwd lng="es"><![CDATA[energía solar]]></kwd>
</kwd-group>
</article-meta>
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