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Advanced two phase flow model for transient molten salt receiver system simulation

Schwager, Christian and Flesch, Robert and Schwarzbözl, Peter and Herrmann, Ulf and Boura, Cristiano (2022) Advanced two phase flow model for transient molten salt receiver system simulation. Solar Energy, pp. 362-375. Elsevier. doi: 10.1016/j.solener.2021.12.065. ISSN 0038-092X.

[img] PDF - Only accessible within DLR bis 11 January 2023 - Postprint version (accepted manuscript)
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Abstract

In order to realistically predict and optimize the actual performance of a concentrating solar power (CSP) plant sophisticated simulation models and methods are required. This paper presents a detailed dynamic simulation model for a Molten Salt Solar Tower (MST) system, which is capable of simulating transient operation including detailed startup and shutdown procedures including drainage and refill. For appropriate representation of the transient behavior of the receiver as well as replication of local bulk and surface temperatures a discretized receiver model based on a novel homogeneous two-phase (2P) flow modelling approach is implemented in Modelica Dymola®. This allows for reasonable representation of the very different hydraulic and thermal properties of molten salt versus air as well as the transition between both. This dynamic 2P receiver model is embedded in a comprehensive one-dimensional model of a commercial scale MST system and coupled with a transient receiver flux density distribution from raytracing based heliostat field simulation. This enables for detailed process prediction with reasonable computational effort, while providing data such as local salt film and wall temperatures, realistic control behavior as well as net performance of the overall system. Besides a model description, this paper presents some results of a validation as well as the simulation of a complete startup procedure. Finally, a study on numerical simulation performance and grid dependencies is presented and discussed.

Item URL in elib:https://elib.dlr.de/148252/
Document Type:Article
Title:Advanced two phase flow model for transient molten salt receiver system simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schwager, ChristianAachen University of Applied Sciences Solar-Institute Jülich, Heinrich-Mußmann Str. 5, 52428 Jülich, GermanyUNSPECIFIED
Flesch, RobertRobert.Flesch (at) dlr.dehttps://orcid.org/0000-0003-2725-8039
Schwarzbözl, PeterPeter.Schwarzboezl (at) dlr.dehttps://orcid.org/0000-0001-9339-7884
Herrmann, UlfSolar-Institut JülichUNSPECIFIED
Boura, CristianoSolar Institut Jülich (SIJ)UNSPECIFIED
Date:11 January 2022
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2021.12.065
Page Range:pp. 362-375
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:solar thermal power, concentrated solar power, molten salt receiver, dynamic process model
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Smart Operation
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Schwarzbözl, Peter
Deposited On:24 Jan 2022 09:11
Last Modified:24 Jan 2022 09:11

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