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          <element elementId="50">
            <name>Title</name>
            <description>A name given to the resource</description>
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                <text>Agricultura sostenible</text>
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            <name>Description</name>
            <description>An account of the resource</description>
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                <text>Dominio científico: Agricultura sostenible</text>
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    <name>Text</name>
    <description>A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.</description>
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        <element elementId="50">
          <name>Title</name>
          <description>A name given to the resource</description>
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              <text>CO2 como refrigerante: del pasado al futuro CO2 as refrigerant: from the past to future</text>
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          <name>Creator</name>
          <description>An entity primarily responsible for making the resource</description>
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              <text>Juan Manuel Belman Flores, V. Pérez-García</text>
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          <name>Description</name>
          <description>An account of the resource</description>
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              <text>En años recientes y debido a la problemática que ha originado el calentamiento mundial, en el campo de la refrigeración y climatización se ha incrementado el interés por utilizar refrigerantes naturales e hidrocarburos con bajo potencial de calentamiento mundial, este es el caso de la utilización del CO2 como fluido frigorígeno que ha sido visto como una alter­nativa adecuada a los actuales refrigerantes en la comunidad científica. Hoy en día, el CO2 cada vez está retomando presencia en el campo de la refrigeración y climatización a nivel internacional, así pues, el presente trabajo tiene la finalidad de dar a conocer su potencial como refrigerante natural, las causas por las cuales este fluido fue relevado momentánea­mente por refrigerantes clorofluorocarbonados y su renacer en pleno siglo XXI. Además, se plantea su aplicación en la generación de frío en nuestro país mediante la tecnología de compresión de vapor basado en ciclo transcrítico.  In recent years, and due to problems resulting from global warming, interest has grown in the fields of refrigeration and air conditioning, specifically regarding the use of natural refrigerants and hydrocarbons with low potential for global warming. Such is the case of the use of CO2 as a cold fluid, which has been considered in the scientific community as an adequate alternative to common refrigerants. Nowadays, the use of CO2 in the areas of refrigeration and air conditioning has been recognized at international levels. Therefore, this work aims to show its potential as a natural refrigerant, the causes why this fluid was temporarily replaced by chlorofluorocarbon refrigerants, and its reappearance in the XXI century. It also proposes the use of CO2 in air conditioning in our country by using vapor compression technology, based on the transcritical cycle.</text>
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          <name>Date</name>
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              <text>2013</text>
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          <name>Subject</name>
          <description>The topic of the resource</description>
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              <text>Dióxido de carbono, calentamiento global, ciclo transcrítico, refrigeración</text>
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          <name>Source</name>
          <description>A related resource from which the described resource is derived</description>
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            <elementText elementTextId="204832">
              <text>Acta Universitaria</text>
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          <name>Publisher</name>
          <description>An entity responsible for making the resource available</description>
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              <text>Universidad de Guanajuato</text>
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          <name>Coverage</name>
          <description>The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant</description>
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              <text>Social Sciences, Science (General)</text>
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          <name>Relation</name>
          <description>A related resource</description>
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              <text>&lt;a href="http://www.actauniversitaria.ugto.mx/index.php/acta/article/view/426" target="_blank" rel="noreferrer noopener"&gt;http://www.actauniversitaria.ugto.mx/index.php/acta/article/view/426&lt;/a&gt;</text>
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