<?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>S1683-07892025000100029</article-id>
<article-id pub-id-type="doi">10.35319/acta-nova.202529</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Experimental evaluation of thermal behavior of Mg(NO3)2 based PCMs after addition of nanoparticles for their enhancement]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación experimental del comportamiento térmico de los PCM basados en Mg(NO 3 ) 2 después de la adición de nanopartículas para su mejora]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Franklin R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zsembinszki]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vérez]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ushak]]></surname>
<given-names><![CDATA[Svetlana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabeza]]></surname>
<given-names><![CDATA[Luisa F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universitat de Lleida GREiA Research Group ]]></institution>
<addr-line><![CDATA[Lleida ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Antofagasta Center for Advanced Research in Lithium and Industrial Mineral ]]></institution>
<addr-line><![CDATA[Antofagasta ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>39</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S1683-07892025000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S1683-07892025000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S1683-07892025000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The use of phase change materials (PCMs) for thermal energy storage (TES) is attractive due to their high-energy storage density within a narrow temperature range. Inorganic PCMs such as salt hydrates and eutectic mixtures are attractive options, although they do have drawbacks like subcooling. This study investigates the addition of commercial nanoparticles in inorganic PCMs to improve the subcooling issue. Specifically, two binary eutectic mixture of Mg(NO3)2·6H2O - NH4NO3 (61.2-38.8wt.%), and Mg(NO3)2·6H2O - MgCl2·6H2O (used as natural bischofite) (50.7-49.3wt.%), and an inorganic commercial SP58 PCM were experimentally tested in a lab-scale shell-and-tube finned thermal energy storage unit. The two eutectic mixtures were doped with 3% of a mixture of nanoparticles of &#947;-Al2O3 and Mg(OH)2 (50-50wt.%) as additives. All resulting PCMs underwent melting and solidification cycles in a temperature range between 30 °C and 70 °C. Results show that the use of additives reduced the subcooling from 3.5 °C to 2 °C and from 2 °C to 0°C in the case of the Mg(NO3)2·6H2O - NH4NO3 and Mg(NO3) 6H2O - MgCl2·6H2O mixtures, respectively. The commercial PCM exhibited a sub-cooling of 6 °C. Moreover, no clear effect of the additives was observed on the heat transfer rate during melting and crystallization processes, as discrepancies in the results were obtained.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El uso de materiales de cambio de fase (PCM) para el almacenamiento de energía térmica (TES) resulta atractivo debido a su alta densidad de almacenamiento energético en un rango de temperatura estrecho. Los PCM inorgánicos, como las sales hidratadas y sus mezclas eutécticas, son opciones atractivas, aunque presentan inconvenientes como el subenfriamiento. Este estudio investiga la adición de nanopartículas comerciales en PCM inorgánicos para mejorar el problema del subenfriamiento. Específicamente, se probaron experimentalmente dos mezclas eutécticas binarias de Mg(NO3)2·6H2O - NH4NO3 (61,2-38,8 % en masa), y Mg(NO3)2·6H2O - MgCl2·6H2O (utilizado como bischofita natural) (50,7-49,3 % en masa) y un PCM inorgánico comercial SP58, en un estanque de almacenamiento de energía térmica tipo carcasa - tubos a escala de laboratorio. Las dos mezclas eutécticas se doparon con un 3% de una mezcla de nanopartículas de &#947;-Al2O3 y Mg(OH)2 (50-50% en masa) como aditivos. Todos los PCM resultantes se sometieron a ciclos de fusión y solidificación en un rango de temperatura de entre 30 °C y 70 °C. Los resultados muestran que el uso de aditivos redujo el subenfriamiento de 3,5 °C a 2 °C y de 2 °C a 0 °C en el caso de las mezclas Mg(NO3)2·6H2O - NH4NO3 y Mg(NO3)2·6H2O - MgCl2·6H2O, respectivamente. El PCM comercial presentó un subenfriamiento de 6 °C. Además, no se observó un efecto claro de los aditivos sobre la velocidad de transferencia de calor durante los procesos de fusión y cristalización, ya que se obtuvieron discrepancias en los resultados.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Phase change materials]]></kwd>
<kwd lng="en"><![CDATA[salt hydrates]]></kwd>
<kwd lng="en"><![CDATA[eutectic mixtures]]></kwd>
<kwd lng="en"><![CDATA[nanoparticles additives]]></kwd>
<kwd lng="en"><![CDATA[subcooling]]></kwd>
<kwd lng="en"><![CDATA[thermal conductivity]]></kwd>
<kwd lng="es"><![CDATA[Materiales de cambio de fase]]></kwd>
<kwd lng="es"><![CDATA[sales hidratadas]]></kwd>
<kwd lng="es"><![CDATA[mezclas eutécticas]]></kwd>
<kwd lng="es"><![CDATA[nanopartículas]]></kwd>
<kwd lng="es"><![CDATA[subenfriamiento]]></kwd>
<kwd lng="es"><![CDATA[conductividad térmica]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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