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Solar Salt - Thermal Property Analysis - Extended Version: Report on thermo-physical properties of binary NaNO3-KNO3 mixtures in a range of 55-65 wt% NaNO3

Bonk, Alexander and Bauer, Thomas (2022) Solar Salt - Thermal Property Analysis - Extended Version: Report on thermo-physical properties of binary NaNO3-KNO3 mixtures in a range of 55-65 wt% NaNO3. DLR-Forschungsbericht. DLR-FB-2022-4. doi: 10.57676/3rea-p782.

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Abstract

Thermal Energy Storage (TES) plays a crucial role for the implementation of dispatchable, renewable energy systems world-wide. Molten salt storage has proven advantageous for storage units in modern CSP plants with large power and capacity levels. Solar Salt, a mixture of 60 wt% NaNO3 and 40 wt% KNO3, is the state-of-the-art storage material and heat transfer fluid and is utilized in temperature regimes between 290 °C and 565 °C in a cold- and a hot tank configuration, respectively. Typically, these salts are provided by salt suppliers using big bags (e.g., ~1000 kg) of the single salts. This study considers that SQM offers big bags with pre-mixed Solar Salt, which simplifies the organizational efforts during the TES start-up. The mixing accuracy is however important to ensure that the final mixture exhibits uniform physicochemical properties. This report investigates the impact of these defined compositional changes for binary mixtures containing 55-65 wt% NaNO3. The thermo-physical properties analysed are the heat capacity, viscosity, thermal conductivity and density, as well as the melting properties.

Item URL in elib:https://elib.dlr.de/185795/
Document Type:Monograph (DLR-Forschungsbericht)
Title:Solar Salt - Thermal Property Analysis - Extended Version: Report on thermo-physical properties of binary NaNO3-KNO3 mixtures in a range of 55-65 wt% NaNO3
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:March 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.57676/3rea-p782
ISSN:1434-8454
Status:Published
Keywords:Concentrating Solar Power (CSP), Thermal Energy Storage (TES), Carnot Battery, Molten Salt, Thermo-physical Properties
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 SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:18 Mar 2022 14:57
Last Modified:20 May 2022 13:03

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