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Preliminary study on a solar water heater using supercritical carbon dioxide as working fluid / H. Yamaguchi in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 1 (Janvier 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 1 (Janvier 2010) . - pp. [011010 /1-6] Titre : Preliminary study on a solar water heater using supercritical carbon dioxide as working fluid Type de document : texte imprimé Auteurs : H. Yamaguchi, Auteur ; N. Sawada, Auteur ; H. Suzuki, Auteur Année de publication : 2010 Article en page(s) : pp. [011010 /1-6] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Solar  water  heater  Carbon  diaxide  Supercritical  fluid  Natural  convection  Heat  transfer Index. décimale : 621.47 Résumé : In this paper, a solar water heater using supercritical carbon dioxide as working fluid is proposed and experimentally studied. For supercritical carbon dioxide, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. Thus, natural convective flow of the supercritical carbon dioxide can be easily induced by solar heating or water cooling. Such convective flow absorbs and transports heat to water in solar collector tubes. Motivated by the above idea, an experimental setup was designed, and a solar water heater was tested. The obtained results show that natural convective flow is well induced, and a flow of 1900 Reynolds number can be achieved even in winter, when the lowest level of solar radiation condition occurs. Furthermore, the measured collector and heat recovery efficiencies are 66.0% and 65.0%, respectively. More details of its mechanism are to be studied, and a complete performance analysis is needed. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Preliminary study on a solar water heater using supercritical carbon dioxide as working fluid [texte imprimé] / H. Yamaguchi, Auteur ; N. Sawada, Auteur ; H. Suzuki, Auteur . - 2010 . - pp. [011010 /1-6]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 1 (Janvier 2010) . - pp. [011010 /1-6] Mots-clés : Solar  water  heater  Carbon  diaxide  Supercritical  fluid  Natural  convection  Heat  transfer Index. décimale : 621.47 Résumé : In this paper, a solar water heater using supercritical carbon dioxide as working fluid is proposed and experimentally studied. For supercritical carbon dioxide, a small change in temperature or pressure can result in large change in density, especially in the state close to the critical point. Thus, natural convective flow of the supercritical carbon dioxide can be easily induced by solar heating or water cooling. Such convective flow absorbs and transports heat to water in solar collector tubes. Motivated by the above idea, an experimental setup was designed, and a solar water heater was tested. The obtained results show that natural convective flow is well induced, and a flow of 1900 Reynolds number can be achieved even in winter, when the lowest level of solar radiation condition occurs. Furthermore, the measured collector and heat recovery efficiencies are 66.0% and 65.0%, respectively. More details of its mechanism are to be studied, and a complete performance analysis is needed. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]