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Titre :
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An air-based cavity-receiver for solar trough concentrators (2011)
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Auteurs :
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Bartelt, Roman, Auteur ;
Maurizio Barbato, Auteur ;
Andrea Pedretti, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Transactions of the ASME. Journal of solar energy engineering (Vol. 132 N° 3, Août 2010)
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Article en page(s) :
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pp. [031017/1-7]
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Note générale :
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Energie Solaire
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Langues :
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Anglais
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Index. décimale :
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621.47
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Tags :
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Cavity resonators Convection Heat conduction transfer Monte Carlo methods Solar absorber-convertors radiation
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Résumé :
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A cylindrical cavity-receiver containing a tubular absorber that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design. A numerical heat transfer model is developed to determine the receiver's absorption efficiency and pumping power requirement. The 2D steady-state energy conservation equation coupling radiation, convection, and conduction heat transfer is formulated and solved numerically by finite volume techniques. The Monte Carlo ray-tracing and radiosity methods are applied to establish the solar radiation distribution and radiative exchange within the receiver. Simulations were conducted for a 50 m-long and 9.5 m-wide collector section with 120°C air inlet temperature, and air mass flows in the range 0.1–1.2 kg/s. Outlet air temperatures ranged from 260°C to 601°C, and corresponding absorption efficiencies varied between 60% and 18%. Main heat losses integrated over the receiver length were due to reflection and spillage at the receiver's windowed aperture, amounting to 13% and 9% of the solar power input, respectively. The pressure drop along the 50 m module was in the range 0.23–11.84 mbars, resulting in isentropic pumping power requirements of 6.45×10−4−0.395% of the solar power input.
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DEWEY :
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621.47
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ISSN :
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0199-6231
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En ligne :
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http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000132000003031017000001&idtype=cvips&gifs=Yes&ref=no
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