Experimental and dimensional study of the draining process in drainback solar thermal systems
| Autor: | P. Carbajo Jiménez, Etienne Wurtz, Klaus Vajen, Y. Louvet, A. Leconte, O. Ouvrier Bonnaz, Gilles Fraisse |
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| Přispěvatelé: | Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Universität Kassel [Kassel], Laboratoire Optimisation de la Conception et Ingénierie de l'Environnement (LOCIE), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Rok vydání: | 2018 |
| Předmět: |
Work (thermodynamics)
Piping Renewable Energy Sustainability and the Environment 020209 energy Flow (psychology) Fluid mechanics 02 engineering and technology Mechanics [SPI]Engineering Sciences [physics] Thermal 0202 electrical engineering electronic engineering information engineering General Materials Science Point (geometry) Siphon ComputingMilieux_MISCELLANEOUS Geology Dimensionless quantity |
| Zdroj: | Solar Energy Solar Energy, 2018, 174, pp.855-865. ⟨10.1016/j.solener.2018.07.075⟩ Solar Energy, Elsevier, 2018, 174, pp.855-865. ⟨10.1016/j.solener.2018.07.075⟩ |
| ISSN: | 0038-092X 1471-1257 |
| Popis: | This study aims at analyzing the phenomenon of siphon draining occurring in drainback solar thermal systems. Although several experimental studies have been previously carried out, there is a lack of theoretical work in the literature. Since describing the draining process from a theoretical point of view should include complex phenomena as two-phase flow and stochastic events, a simpler representation is sought through dimensional analysis. The main physical parameters impacting the draining are at first identified with the equations of fluid mechanics before being individually assessed with experiments. The piping diameter, the type of fluid, the piping length, the drained volume of the circuit as well as the singular pressure losses are for this purpose varied throughout the experiments. A methodology for obtaining an empirical equation using dimensionless variables is finally developed, showing that the impact of all the studied parameters on the draining time could be accurately described for piping with an inner diameter of 10 and 16 mm. |
| Databáze: | OpenAIRE |
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