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Numerical analysis of natural convection in a latent heat thermal energy storage system containing rectangular enclosures

Vogel, Julian und Johnson, Maike und Eck, Markus und Laing, Dörte (2014) Numerical analysis of natural convection in a latent heat thermal energy storage system containing rectangular enclosures. In: Conference proceedings Eurotherm Seminar #99. Eurotherm Seminar #99 - Advances in Thermal Energy Storage, 2014-05-28 - 2014-05-30, Lleida, Spanien. ISBN 978-84-697-0467-7. (nicht veröffentlicht)

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Kurzfassung

Natural convection in the liquid phase of a phase change material (PCM) is often neglected in the analysis and design of latent heat thermal energy storage (LHTES) systems. However, depending on geometry and material properties, the influence of natural convection can be significant. This is also the case in an experimental LHTES lab-scale storage unit for high temperature PCMs that was designed, built and operated at DLR. The unit is a storage adaptation of a flat plate heat exchanger. The space between the heated flat plates forms rectangular enclosures, which are filled with PCM. The behavior of such a system is to be described by numerical methods. First, a method that accounts only for heat conduction was used. In some cases, simulated results diverged considerably from experimental data. This divergence was expected to be mostly caused by natural convection. In this work, improved simulation methods are applied that include the modeling of natural convection. For a detailed reference solution, a sophisticated CFD-Method that solves the Navier-Stokes-Equations is used. The results are validated with data from the above mentioned DLR storage test unit filled with the eutectic mixture of potassium nitrate (KNO3) and sodium nitrate (NaNO3). Although differences between simulation results and experimental data still remain, the agreement has improved greatly in comparison to previous heat conduction simulations. Possible causes for divergences and suggestions for further improvement are given. Moreover, the detailed flow and temperature fields driven by natural convection are presented and discussed. Finally, the influence of natural convection on the thermal power characteristic is analyzed. A strong influence is observed for the charging process, where the power input is considerably enhanced. The discharging process is only slightly affected.

elib-URL des Eintrags:https://elib.dlr.de/113475/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Numerical analysis of natural convection in a latent heat thermal energy storage system containing rectangular enclosures
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Vogel, Julianjulian.vogel (at) dlr.dehttps://orcid.org/0000-0001-9792-2332NICHT SPEZIFIZIERT
Johnson, Maikemaike.johnson (at) dlr.dehttps://orcid.org/0000-0002-1903-9955NICHT SPEZIFIZIERT
Eck, MarkusNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Laing, DörteNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2014
Erschienen in:Conference proceedings Eurotherm Seminar #99
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
ISBN:978-84-697-0467-7
Status:nicht veröffentlicht
Stichwörter:Latent heat thermal energy storage; phase change material (PCM); solidification and melting; natural convection; rectangular enclosures; numerical simulation (CFD)
Veranstaltungstitel:Eurotherm Seminar #99 - Advances in Thermal Energy Storage
Veranstaltungsort:Lleida, Spanien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:28 Mai 2014
Veranstaltungsende:30 Mai 2014
Veranstalter :Universitat de Lleida
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Thermische Energiespeicher
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse (Speicher) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Vogel, Julian
Hinterlegt am:27 Jul 2017 10:48
Letzte Änderung:24 Apr 2024 20:18

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