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Experimental and Numerical Investigation of a 4 MWh High Temperature Molten Salt Thermocline Storage System with Filler

Odenthal, Christian and Klasing, Freerk and Knödler, Philipp and Zunft, Stefan and Bauer, Thomas (2019) Experimental and Numerical Investigation of a 4 MWh High Temperature Molten Salt Thermocline Storage System with Filler. SolarPaces 2019, 1.-4. Oktober, Daegu, South Korea.

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Abstract

Molten salt thermocline storage is a novel concept for storing large amounts of thermal energy at high temperatures of up to 560°C. Instead of storing molten salt in two separate tanks, as in the state-of-art systems, the density difference of hot and cold molten salt is used to maintain stratification inside a single-tank [1]. Advantages are cost savings due to the absence of the second tank, smaller ground coverage, no limitations in tank height due to short shafted pumps, also avoiding unused space at the bottom of the tanks and simplification of the gas handling. However, the greatest cost reduction potential arises from the application of a low cost filler material, substituting a large fraction of the costly molten salt. The total costs for the storage system can therefore be reduced significantly, Pacheco et al. [2] reported a cost reduction potential of 34% that can be increased to more than 50% if the entire storage volume could be utilized. For large scale applications, one challenge is to understand the scalability of this concept. Impacting factors are thermal strain in the tank walls and thermal ratcheting especially for large tank diameters and high temperature differences [2]. The dynamic temperature distribution in the storage is key to assess these issues. Therefore this study aims to investigate the thermocline filler concept both experimentally and numerically. [1] Gil A, Medrano M, Martorell I, Lázaro A, Dolado P, Zalba B, et al. State of the art on high temperature thermal energy storage for power generation. Part 1--Concepts, materials and modellization. Renewable and Sustainable Energy Reviews 2010;14:31–55. doi:10.1016/j.rser.2009.07.035. [2] Knödler, Philipp. Thermal Ratcheting in Thermocline Energy Storage Tanks: Parametrization and Application of a Continuum Model, Casablanca, Marokko: 2018.

Item URL in elib:https://elib.dlr.de/131379/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental and Numerical Investigation of a 4 MWh High Temperature Molten Salt Thermocline Storage System with Filler
Authors:
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
Knödler, PhilippPhilipp.Knoedler (at) dlr.deUNSPECIFIED
Zunft, StefanStefan.Zunft (at) dlr.dehttps://orcid.org/0000-0002-8499-3067
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:16 December 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:molten salt; thermocline; thermal energy storage; TESIS;
Event Title:SolarPaces 2019
Event Location:Daegu, South Korea
Event Type:international Conference
Event Dates:1.-4. Oktober
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 14:47
Last Modified:16 Dec 2019 14:47

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