<?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>2304-0106</journal-id>
<journal-title><![CDATA[Anales de la Academia de Ciencias de Cuba]]></journal-title>
<abbrev-journal-title><![CDATA[Anales de la ACC]]></abbrev-journal-title>
<issn>2304-0106</issn>
<publisher>
<publisher-name><![CDATA[Academia de Ciencias de Cuba]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2304-01062023000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinación de los coeficientes de transferencia de calor en aerocondensadores que operan en centrales eléctricas de biomasa]]></article-title>
<article-title xml:lang="en"><![CDATA[Determination of the heat transfer coefficient in air cooled condenser used at biomass power plants]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camaraza Medina]]></surname>
<given-names><![CDATA[Yanán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz Fonticiella &#8224;]]></surname>
<given-names><![CDATA[Oscar M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Morales]]></surname>
<given-names><![CDATA[Osvaldo F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio González]]></surname>
<given-names><![CDATA[Ángel M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Matanzas  ]]></institution>
<addr-line><![CDATA[ Matanzas]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central Marta Abreu de Las Villas  ]]></institution>
<addr-line><![CDATA[ Santa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2304-01062023000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2304-01062023000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2304-01062023000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: El proyecto de centrales eléctricas (CE) de biomasa en Cuba enfrenta una limitante en la disponibilidad de agua para condensación. El aerocondensador (ACC) es la solución más difundida para reducir los índices de consumo de aguapara condensación y flexibilizar la ubicación de la CE. En el ACC la presión de agente de trabajo depende de variables ambientales, generando pérdidas de rendimiento y potencia. En la actualidad no se dispone de un método para estimar la relación entre la presión y el coeficiente de traspaso de calor. El objetivo de la investigación fue determinar cuál sería el rango de operación más adecuado de presiones y determinar analíticamente la causa de esta problemática.  Métodos: Se hace uso de métodos matemáticos de superposición de variables cruzadas (Breshnetzov), para crear una correlación que sea capaz de predecir la influencia de la presión sobre el coeficiente de transferencia de calor en un ACC.  Resultados y discusión: Mediante la superposición cruzada se establece la dependencia entre la presión, el coeficiente medio de transferencia de calor y las variables ambientales. La combinación de estas variables generadas expresiones no homogéneas, que permiten predecir con una precisión adecuada esta relación. Como conclusiones, se concluye que en el ACC la presión es inversamente proporcional al coeficiente de transferencia de calor en una potencia 0,176; reduciéndose este último en un 0,95 % por cada kPa incrementado en la presión de salida de turbina. El modelo propuesto fue correlacionado con 714 datos de instalaciones reales, obteniéndose una desviación media de ± 35,2 % en el 92,4 % de los datos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: The project of biomass power plants (EC) in Cuba has as limitation the access to water required by the condensation facilities. Air Cooled Condenser (ACC) is the most widely used solution worldwide to reduce the high rates of water consumption in condensation systems and make the location of the power plant more flexible. In the ACC the working agent pressure is affected by environmental conditions, which produces losses of performance and power. There is currently no method available to estimate the influence of pressure on the heat transfer coefficient in ACC. The objective of the research was to determine which would be the range of operation more adequate regarding pressures and to determine analytically the cause of this problem.  Methods: A thematic method of superposition of crossed variables (Breshnetzov) is used to establish a correlation that is capable of predicting the influence of pressure on the heat transfer coefficient in ACC.  Results and discussion: By means of crossed superposition is defined the dependence between pressure, heat transfer coefficient and environmental conditions. The combinations of these variables generate two non-homogeneous expressions, which allow us to predict this relationship with adequate fit. As some conclusions, the ACC pressure is inversely proportional to heat transfer coefficient in potency 0,176; decreasing this in 0,95 % for each kPa of increment in the back pressure of steam turbine. The proposal model was correlated with data of 714 ACC facilities, was verified that the mean deviation is ± 35,2 % in 92,4 % of available data.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[método de Breshnetzov]]></kwd>
<kwd lng="es"><![CDATA[coeficiente de transferencia de calor]]></kwd>
<kwd lng="es"><![CDATA[variables independientes]]></kwd>
<kwd lng="en"><![CDATA[Breshnetzov&#8217;s method]]></kwd>
<kwd lng="en"><![CDATA[heat transfer coefficient]]></kwd>
<kwd lng="en"><![CDATA[independent variables]]></kwd>
</kwd-group>
</article-meta>
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