| Titre : | Optimization model for solar thermochemical reactor: efficiency increase by a nonuniform heat sink distribution (2012) |
| Auteurs : | S. Tescari, Auteur ; N. Mazet, Auteur ; P. Neveu, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME. Journal of solar energy engineering (Vol. 133 N° 3 (N° Spécial), Août 2011) |
| Article en page(s) : | 06 p. |
| Note générale : | Solar energy |
| Langues : | Anglais |
| Index. décimale : | 621.47 |
| Tags : | Chemical energy conversion reactions reactors Computational fluid dynamics Heat sinks Optimisation Power consumption Solar concentrators power Temperature distribution |
| Résumé : | This study focuses on thermochemical cavity-type reactor, with a reactive material directly irradiated by concentrated solar energy. General tendencies of reactor performance are analyzed as a function of the reactor geometry. The objective is to define a simplified model that can be adapted easily to different reactor designs or different operating conditions. For this reason, the chemical reaction is not precisely fixed but rather characterized by a reaction temperature and a useful power consumed by the endothermic reaction, inside the reactive material. In order to increase the efficiency, two new reactor designs are proposed. These designs allow obtaining a nonuniform distribution of the useful power consumed by the reaction with the depth in a circular cylindrical cavity (z-axis). This is done in two ways: by varying the reactive material thickness along the axis or by varying its density at a constant thickness. The results show that these reactor concepts lead to a more uniform temperature distribution along the z-axis and a diminution of the heat losses. Thus, the reactor efficiency can increase significantly. The results of the simplified model can be used as a system predesign. A more accurate CFD model could be used afterward to refine the optimal shape. |
| DEWEY : | 621.47 |
| ISSN : | 0199-6231 |
| En ligne : | http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003031011000001&idtype=cvips&gifs=Yes&ref=no |
