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Comparison of Numeric Models for the Simulation of Molten Salt Thermocline Thermal Energy Storage with Filler under Different Applications

Odenthal, Christian and Klasing, Freerk and Bauer, Thomas (2019) Comparison of Numeric Models for the Simulation of Molten Salt Thermocline Thermal Energy Storage with Filler under Different Applications. In: Proceedings of the 4th Thermal and Fluids Engineering Conference (TFEC), 33 (2019), pp. 1741-1750. 4th Thermal and Fluids Engineering Conference (TFEC), 14.-17. April, Las Vegas, NV, USA. DOI: 10.1615/TFEC2019.tes.027998 ISSN 2379-1748

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Official URL: http://dl.astfe.org/conferences/tfec2019


To date, two-tank molten salt systems mark the current state-of-the-art for large scale high-temperature thermal energy storage applications. Single-tank thermocline systems with filler (TCF) promise significant cost reductions, but are still under development. Available publications have utilized various models with different simplifications or assumptions. Most of these models have been developed for gas through-flow regenerator storage systems, such as Cowper stoves. The applications range from simple sizing calculations up to annual simulations. So far, only a few publications deal with the different outcome of those models. Particularly for molten salt applications, there has been no comparative work. To resolve this shortcoming, a comparative study of four one-dimensional models suitable for packed bed molten salt storage systems is presented. The investigated models are the single phase model, the Schumann model, the continuous solid phase model and a recently developed bidisperse model by the own group. Based on practical considerations, different representative outer boundary conditions are defined for the comparison In the first case, the storage volume is charged beginning from uniform temperature (single blow) followed by a standby period (hold). This scenario is often used for model validations since it causes harsh gradients. In the second case, the storage volume is charged and discharged for 14 consecutive cycles, to unveil slowly developing inaccuracies during operation. The outcome of the simulations shows significant differences depending on those outer boundary conditions. It is shown that the single blow operation must be evaluated carefully as it might lead to a false validation of a model. Furthermore, it is shown that the investigated models differ by up to 14 % from the chosen reference model. The outcome of this work provides an overall contribution to a better understanding of single tank molten salt storage simulation with filler.

Item URL in elib:https://elib.dlr.de/131374/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Numeric Models for the Simulation of Molten Salt Thermocline Thermal Energy Storage with Filler under Different Applications
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Odenthal, Christianchristian.odenthal (at) dlr.dehttps://orcid.org/0000-0003-0041-5751
Klasing, FreerkFreerk.Klasing (at) dlr.dehttps://orcid.org/0000-0002-7079-9220
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:16 December 2019
Journal or Publication Title:Proceedings of the 4th Thermal and Fluids Engineering Conference (TFEC)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1615/TFEC2019.tes.027998
Page Range:pp. 1741-1750
Keywords:Molten Salt, Thermal Energy Storage, Model Comparison
Event Title:4th Thermal and Fluids Engineering Conference (TFEC)
Event Location:Las Vegas, NV, USA
Event Type:international Conference
Event Dates:14.-17. April
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr
Location: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Odenthal, Christian
Deposited On:16 Dec 2019 14:46
Last Modified:16 Dec 2019 14:46

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