<?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>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222016000300075</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis termo-hidráulico de captadores solares cilindroparabólicos para generación directa de vapor con RELAP5]]></article-title>
<article-title xml:lang="en"><![CDATA[Thermo-Hydraulic Analysis of Parabolic trough Collectors for Direct Steam Generation with Relap5]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[Loreto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saynes]]></surname>
<given-names><![CDATA[Jacobo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moya]]></surname>
<given-names><![CDATA[Sara L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Investigaciones Eléctricas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Nacional de Investigación y Desarrollo Tecnológico  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>3</numero>
<fpage>75</fpage>
<lpage>91</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222016000300075&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222016000300075&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222016000300075&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este trabajo presenta un estudio termo-hidráulico numérico de una fila tipo de captadores solares cilindroparabólicos (CCP) para generación directa de vapor (GDV), que opera en la configuración "un solo paso" (once-through). El estudio se realizó mediante el simulador RELAP5/MOD3. La fila de CCP considerada consta de 10 unidades, con una longitud total de 1 000 m. El estudio de la fila incluye un análisis del comportamiento del sistema bajo condiciones nominales (70 bar y 723 K), y un análisis de sensibilidad a variables de funcionamiento y parámetros de diseño, como temperatura del agua de alimentación, distribución perimetral de radiación solar concentrada en la pared exterior del tubo absorbedor, y diámetro interior y material del tubo absorbedor. Se encontró una relación directa entre el incremento de la temperatura de alimentación y el desplazamiento de las regiones de evaporación y sobrecalentamiento; este desplazamiento es de 22 m para los saltos de temperatura considerados, permaneciendo constante la longitud de la región de evaporación, puesto que ni el caudal de agua de alimentación ni la radiación solar directa se modificaron para este tipo de análisis. El perfil perimetral de radiación solar concentrada en el tubo absorbedor afecta de manera importante tanto en los coeficientes de transferencia de calor convectivos como en la ubicación de las zonas de transición precalentamiento/ evaporación y evaporación/sobrecalentamiento, en especial para la segunda de ellas, con un desfasamiento de hasta 18 m. En cuanto al efecto del diámetro interno del tubo absorbedor, se determinó que el número de patrones de flujo es menor cuando el diámetro interior es mayor, con independencia del espesor de pared o material del tubo. El material del tubo absorberdor, acero inoxidable 316Ti y acero ferrítico A355 P22 afecta en particular el comportamiento transitorio del flujo y las diferencias máximas de temperatura en la sección transversal de la pared del tubo absorbedor, siendo dichas diferencias más altas cuando el absorbedor está fabricado en acero inoxidable.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper presents a numerical thermo-hydraulic study of a standard row of parabolic-trough solar collector (PTC) for direct steam generation (GDV) working in the configuration oncethrough. The research was carried out with the simulator RELAP5/ MOD3. The considered PTC row has 10 units with a total length of 1000 m. The study of the row includes a performance analysis of the system under nominal conditions (70 bar and 723 K), and a sensitivity analysis to functioning variables and design parameters, such as: feed water temperature; perimeter distribution of the concentrated solar radiation in the wall of the absorber tube; and inner diameter and material of the absorber tube. It was found direct relation between the increase of the inlet temperature and the shift of the evaporation and superheating regions; this shift is 22m for the different temperature considered, remaining constant the length of the evaporation region, because neither the feed water flow nor the direct solar radiation were modified for this type of analysis. The perimeter profile of the concentrated solar radiation on the absorber tube seriously affects the convective heat transfer coefficients as well as the transition position in the preheating/evaporation and evaporation/superheating, especially for the second one with a difference of 18 m. With regard to the absorber tube inner diameter it was determined that the number of flux patterns is smaller when the inner diameter is bigger, regardless to the wall thickness or tube material. The material of the absorber tube, stainless steel 316Ti and ferritic steel A355 P22, affects mainly the flow transient behavior and the maximum differences in temperature in the transversal section of the absorber tube wall, being these differences higher when the absorber is made of stainless steel.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[captadores solares cilindroparabólicos]]></kwd>
<kwd lng="es"><![CDATA[generación directa de vapor]]></kwd>
<kwd lng="es"><![CDATA[estudio termo-hidráulico]]></kwd>
<kwd lng="en"><![CDATA[Parabolic-Trough Collectors]]></kwd>
<kwd lng="en"><![CDATA[Direct Steam Generation]]></kwd>
<kwd lng="en"><![CDATA[Thermo-Hydraulic Model]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Receiver Behavior in Direct Steam Generation with Parabolic Troughs]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Almanza]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Lentz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Solar Energy]]></source>
<year>1997</year>
<volume>61</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>275-8</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Status and First Results of the DUKE Project - Component Qualification of New Receivers and Collectors]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Feldhoff]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Eickhoff]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[León]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[MeyerGrünefeldt]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pernpeintner]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hirsch]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<source><![CDATA[Energy Procedia]]></source>
<year>2014</year>
<volume>49</volume>
<page-range>1766-76</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Parabolic-Trough Solar Collectors and their Applications]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernández-García]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Renewable &amp; Sustainable Energy Reviews]]></source>
<year>2010</year>
<volume>14</volume>
<page-range>1695-721</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ishii]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Thermo-Fluid Dynamic Theory of Two-Phase Flow]]></source>
<year>1975</year>
<publisher-loc><![CDATA[Paris ]]></publisher-loc>
<publisher-name><![CDATA[Eyrolles]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ishii]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Takashi]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Thermo-Fluid Dynamics of TwoPhase Flow]]></source>
<year>2006</year>
<publisher-loc><![CDATA[Berlin ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Flow Boiling in Horizontal Tubes: Part I - Development of Adiabatic Two-Phase Flow Pattern Map]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kattan]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Thome]]></surname>
<given-names><![CDATA[J. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Favrat]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Trans. ASME, J. Heat Transfer]]></source>
<year>1998</year>
<volume>120</volume>
<page-range>140-7</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The Three Dimensional Time and Volume Averaged Conservations Equations of Two Phases Flow]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lahey]]></surname>
<given-names><![CDATA[R. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Drew]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Adv. Nucl. Sci. Technol.]]></source>
<year>1989</year>
<volume>20</volume>
<page-range>1-69</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Modeling the Dynamics of the Multiphase Fluid in Parabolic-Trough Solar Steam Generating Systems]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lobón]]></surname>
<given-names><![CDATA[D. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Baglietto]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Energy Conversion and Management]]></source>
<year>2014</year>
<volume>78</volume>
<page-range>393-404</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moya]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Numerical Study of the Thermal Hydraulic Behaviour of WaterSteam Flow in the Absorber Tube of the DISS System Using RELAP]]></source>
<year>2011</year>
<conf-name><![CDATA[ International Symposium Solar PACES 2011]]></conf-name>
<conf-date>21-24 septiembre, 2011</conf-date>
<conf-loc>Granada, España </conf-loc>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Modelling of Parabolic-Through Direct Generation Solar Collectors]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Odeh]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Behnia]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Morrison]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Solar Energy]]></source>
<year>1998</year>
<volume>62</volume>
<page-range>395-406</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Thermal 3D Model for Direct Solar Steam Generation under Superheated Conditions]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Serrano-Aguilera]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Parras]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Applied Energy]]></source>
<year>2014</year>
<volume>132</volume>
<page-range>370-38</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hohorst]]></surname>
<given-names><![CDATA[J. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnsen]]></surname>
<given-names><![CDATA[E. C.]]></given-names>
</name>
</person-group>
<source><![CDATA[SCDAP/RELAP5/ MOD 3.1 Code Manual. NUREG/CR-6150]]></source>
<year>1995</year>
<publisher-loc><![CDATA[Idaho Falls ]]></publisher-loc>
<publisher-name><![CDATA[Idaho National Engineering Laboratory]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Thermal Analysis of Solar Receiver Pipes with Superheated Steam]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Roldan]]></surname>
<given-names><![CDATA[M. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Applied Energy]]></source>
<year>2013</year>
<volume>103</volume>
<page-range>73-84</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A Model for Predicting Flow Regime Transitions in Horizontal and Near Horizontal Gas-liquid Flow]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Taitel]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Dukler]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[AIChe Journal]]></source>
<year>1976</year>
<volume>22</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>47-55</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Investigation of Flow Boiling in Horizontal Tubes: Part I. A New Diabatic Two-Phase Flow Pattern Map]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wojtan]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Ursenbacher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Thome]]></surname>
<given-names><![CDATA[J. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[International Journal of Heat and Mass Transfer]]></source>
<year>2005</year>
<month>a</month>
<volume>48</volume>
<page-range>2955-69</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Investigation of Flow Boiling in Horizontal Tubes: Part IIDevelopment of a New Heat Transfer Model for Stratified-wavy, Dryout and Mist Flow Regimes]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wojtan]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Ursenbacher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Thome]]></surname>
<given-names><![CDATA[J. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[International Journal of Heat and Mass Transfer]]></source>
<year>2005</year>
<month>b</month>
<volume>48</volume>
<page-range>2970-85</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Generación directa de vapor con colectores solares cilindro parabólicos, Proyecto Direct Solar Steam (DISS)]]></source>
<year>2004</year>
<publisher-loc><![CDATA[Madrid ]]></publisher-loc>
<publisher-name><![CDATA[Ciemat]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Direct Steam Generation in Parabolic Troughs: Final Results and Conclusions of the DISS Project]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Valenzuela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[León]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hennecke]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Eck]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Weyers]]></surname>
<given-names><![CDATA[H.-D.]]></given-names>
</name>
<name>
<surname><![CDATA[Eickhoff]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Energy]]></source>
<year>2004</year>
<volume>29</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>635-44</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[INDITEP: The First Pre-Commercial DSG Solar Power Plant]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zarza]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[M. E.]]></given-names>
</name>
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Caballero]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Rueda]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Solar Energy]]></source>
<year>2006</year>
<volume>80</volume>
<page-range>1270-6</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[History, Current State, and Future of Linear Fresnel Concentrating Solar Collectors]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Wendelin]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Wagner]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kutscher]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Solar Energy]]></source>
<year>2014</year>
<volume>103</volume>
<page-range>639-52</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
