<?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>2594-1925</journal-id>
<journal-title><![CDATA[Revista de ciencias tecnológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. cienc. tecnol.]]></abbrev-journal-title>
<issn>2594-1925</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Baja California]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2594-19252023000300107</article-id>
<article-id pub-id-type="doi">10.37636/recit.v6n3e260</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio numérico de un colector solar utilizando agua y nanofluido de dióxido de titanio base agua como fluidos de trabajo mediante la dinámica de fluidos computacional]]></article-title>
<article-title xml:lang="en"><![CDATA[Numerical study of a solar collector using water and titanium dioxide water-based nanofluid as working fluids by means of computational fluid dynamics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Núñez]]></surname>
<given-names><![CDATA[Oscar Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara Chávez]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas Robles]]></surname>
<given-names><![CDATA[Arilí]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Ángeles]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Mexicali Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2023</year>
</pub-date>
<volume>6</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2594-19252023000300107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2594-19252023000300107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2594-19252023000300107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen. El presente trabajo se centra en el estudio numérico comparativo del desempeño térmico, hidráulico y de generación de entropía de un colector solar de tubos evacuados utilizando agua y nanofluido de dióxido de titanio (TiO  2 ) de base agua como fluidos de trabajo por medio de la Dinámica de Fluidos Computacional. El estudio consideró una geometría completa en 3D bajo las condiciones meteorológicas de la ciudad de Mexicali, México, en una operación de 9 horas. De acuerdo con los resultados, en todo el periodo de operación, el colector solar de tubos evacuados tuvo un mejor rendimiento en términos de su temperatura de salida, así como en la velocidad dentro de éste al utilizar el nanofluido en lugar de usar solo agua como fluido de trabajo. Además, para la formulación de la generación de entropía se tomaron en cuenta las irreversibilidades generadas por los fenómenos de efectos viscosos, transferencia de calor y pérdida de calor, tanto de manera global como de manera local. La formulación de la generación de entropía local permite mostrar la localización exacta de las diferentes irreversibilidades. Así mismo, se encontró que al utilizar el nanofluido, se obtiene una reducción significativa de la generación de entropía en todo el colector solar. Finalmente, la obtención de la generación de entropía por medio de este tipo de análisis puede ayudar a mejorar el rendimiento de los colectores solares a través de la minimización de entropía.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract. A thermo-hydraulic performance and entropy generation comparison of an evacuated tube solar collector using water and titanium dioxide (TiO  2 ) water-based nanofluid as working fluids is carried out by means of Computational Fluid Dynamics. It is considered a complete 3D geometry under meteorological conditions of the city of Mexicali, Mexico under an operation time of 9 hours. It was found that, throughout the operation time, the evacuated tube solar collector had a better performance in terms of outlet temperature and velocity inside the solar collector using the nanofluid than using only water as working fluid. The phenomena of viscous effects, heat transfer and heat loss in a global and local form are considered in the formulation of the entropy generation. The local entropy generation formulation also allows to illustrate the exact location of the irreversibilities. It was found that, using TiO  2 water-based nanofluid as working fluid leads to a reduction of the entropy generation in all the evacuated tube solar collector. Finally, this type of analysis by obtaining the global and local entropy generation can be helpful to improve their performance through the entropy minimization.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Colector Solar]]></kwd>
<kwd lng="es"><![CDATA[Nanofluido]]></kwd>
<kwd lng="es"><![CDATA[Dinámica de Fluidos Computacional]]></kwd>
<kwd lng="es"><![CDATA[Generación de Entropía]]></kwd>
<kwd lng="en"><![CDATA[Solar Collector]]></kwd>
<kwd lng="en"><![CDATA[Nanofluid]]></kwd>
<kwd lng="en"><![CDATA[Computational Fluid Dynamics]]></kwd>
<kwd lng="en"><![CDATA[Entropy Generation]]></kwd>
</kwd-group>
</article-meta>
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