CFD STUDY OF THERMOCLINE FORMATION IN STRATIFIED WATER STORAGE: CONSIDERATION OF A SECOND-ORDER BOUSSINESQ APPROXIMATION TO MODEL BUOYANCY EFFECTS AND ITS APPLICATION TO ASSESS THE IMPACT OF OPERATING CONDITIONS
| Autor: | Ferre, Alexis, Pouvreau, Jérôme, Serra, Sylvain, Manceau, Rémi, Bruch, Arnaud |
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| Přispěvatelé: | Institut Pluridisciplinaire de recherche appliquée en génie pétrolier (IPRA), Université de Pau et des Pays de l'Adour (UPPA), Commissariat Energie Atomique (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA LITEN Grenoble, Laboratoire de Génie Thermique Énergétique et Procédés (EA1932) (LATEP), Laboratoire de Mathématiques et de leurs Applications [Pau] (LMAP), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Computational AGility for internal flows sImulations and compaRisons with Experiments (CAGIRE), Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Pau et des Pays de l'Adour (UPPA) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | IHTC-17 | ID: 435 Proceedings of the 17th International Heat Transfer Conference, IHTC-17 14 – 18 August 2023, Cape Town, South Africa Proceedings of the 17th International Heat Transfer Conference, IHTC-17 14 – 18 August 2023, Cape Town, South Africa, Aug 2023, Cape Town, South Africa |
| Popis: | International audience; Thermal storages are components used in energy systems, such as district heating networks or thermal power plants, in order to decouple the supply of heat from its use. Usage rate of monophasic thermocline storages is highly dependent on the thermal gradient zone inside the fluid, also named thermocline. While thermal stratification results of a formation phase followed by a degradation phase, the early stages of thermocline establishment is primarily responsible for its thickness. CFD allow to consider the multiple physical phenomena involved during the thermocline formation, in particular the buoyancy effects. These effects are usually considered by selecting either a variable density with respect to the temperature or a constant one by using the commonly used (first-order) Boussinesq approximation. However, the former approach implies an increased computational cost, and the latter is only valid for an unclear validity range of temperature difference. Hence, this article suggests the use of a second-order Boussinesq approximation, coupled with a RANS turbulence approach, to better account for buoyancy effects in a turbulent water flow submitted to a large temperature differences. CFD results obtained with a quadratic Boussinesq approximation are similar to the one obtained with a variable density but with a computation time reduced by half. This approach is applied to the issue of reducing the thermocline thickness during its creation and the impact of linear flow rate ramps is assessed on both a uniform and initially stratified storage. On an initially cold tank, results show that the longer the ramp time, the thinner the thermocline. In contrast, on the initially stratified tank tested, a gradual injection shows no significant reduction of the thermocline thickness. This can be relevant when performing storage management enhancement. |
| Databáze: | OpenAIRE |
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