Odenthal, Christian and Tombrink, Jonas and Klasing, Freerk and Bauer, Thomas (2023) Comparative Study of Models for Packed Bed Molten Salt Storage Systems. Applied Thermal Engineering, 226 (2023). Elsevier. doi: 10.1016/j.applthermaleng.2023.120245. ISSN 1359-4311.
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Abstract
To date various models for packed bed single tank molten salt storage systems have been developed. The question arises in how far certain modeling assumptions can affect the outcome of these models. This can also depend on the applied use case, for example a short validation simulation versus an annual simulation. Thus, a comparative study is performed, considering four one-dimensional models for packed beds: the Schumann model, the continuous-solid-phase model, the single-phase model and a recently developed bidisperse model. Additionally, the impact of heat losses and variable fluid properties are considered as well. The comparison is performed for different use cases and covers the single blow operation, cyclic operation and annual simulations. Common boundary conditions are derived from a 100 MWel concentrating solar thermal power plant with molten salt as heat transfer fluid. A large and a small storage volume, each with a small and a large particle packing are designed to cover a range of practical storage configurations. The aim of this work is to provide guidelines for the selection of a reasonable level of modelling detail depending on the desired accuracy and computational effort. Results indicate that the outcome can significantly differ between the use cases. Effective conductivity has visible impact in stand-by periods and small sized packings with strong thermal gradients. The single-phase model has low computing effort but is applicable only with packings in the range of millimeters. The bidisperse model has significantly improved accuracy when applied to packings with smaller particles in combination with larger particles. Heat losses showed little impact for the considered storage volumes. Temperature dependent fluid properties have an impact within short periods but average out in cyclic and annual simulations, which justifies neglecting them.
Item URL in elib: | https://elib.dlr.de/197290/ | ||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||
Title: | Comparative Study of Models for Packed Bed Molten Salt Storage Systems | ||||||||||||||||||||
Authors: |
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Date: | 21 February 2023 | ||||||||||||||||||||
Journal or Publication Title: | Applied Thermal Engineering | ||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||
Volume: | 226 | ||||||||||||||||||||
DOI: | 10.1016/j.applthermaleng.2023.120245 | ||||||||||||||||||||
Publisher: | Elsevier | ||||||||||||||||||||
ISSN: | 1359-4311 | ||||||||||||||||||||
Status: | Published | ||||||||||||||||||||
Keywords: | Thermal energy storage Model comparison Thermocline Packed bed Solar thermal power | ||||||||||||||||||||
HGF - Research field: | Energy | ||||||||||||||||||||
HGF - Program: | Energy System Design | ||||||||||||||||||||
HGF - Program Themes: | Digitalization and System Technology | ||||||||||||||||||||
DLR - Research area: | Energy | ||||||||||||||||||||
DLR - Program: | E SY - Energy System Technology and Analysis | ||||||||||||||||||||
DLR - Research theme (Project): | E - Energy System Technology | ||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||
Institutes and Institutions: | Institute of Engineering Thermodynamics > Thermal Process Technology | ||||||||||||||||||||
Deposited By: | Odenthal, Dr. Christian | ||||||||||||||||||||
Deposited On: | 27 Oct 2023 14:16 | ||||||||||||||||||||
Last Modified: | 27 Oct 2023 14:16 |
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