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An experimental study of a non-eutectic mixture of KNO3 and NaNO3 with a melting range for thermal energy storage

Martin, Claudia and Bauer, Thomas and Müller-Steinhagen, Hans (2013) An experimental study of a non-eutectic mixture of KNO3 and NaNO3 with a melting range for thermal energy storage. Applied Thermal Engineering. Elsevier. DOI: [10.1016/j.applthermaleng.2013.03.008] ISSN 1359-4311 (In Press)

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Official URL: http://www.sciencedirect.com/science/article/pii/S1359431113001646

Abstract

Thermal energy storage is a key technology for reduced cost solar thermal power generation. This high-temperature application requires storage operation above 100 °C. Possible options are sensible, latent and t hermochemical heat storages. A combination of sensible and latent heat storage seems a promising option for thermal energy storage with an increased specific heat capacity. Salt mixtures with a melting range as opposed to a melting point combine the effects of both latent and sensible heat storage. These provide the possibility of utilising not only latent but in addition sensible heat during the melting and solidification process. The present paper focuses on a binary mixture of 30 wt.-% potassium nitrate (KNO3) and 70 wt.-% sodium nitrate (NaNO3). The measurement systems include a differential scanning calorimeter, a melting point apparatus, a custom-built adiabatic calorimeter and a labscale storage unit. The sample masses ranged from about 20 mg to 156 kg. Tests with the lab-scale storage unit indicate that salt mixtures with a melting range may be successfully utilised in large-scale applications.

Item URL in elib:https://elib.dlr.de/82032/
Document Type:Article
Title:An experimental study of a non-eutectic mixture of KNO3 and NaNO3 with a melting range for thermal energy storage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Martin, Claudiaclaudia.martin (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.deUNSPECIFIED
Müller-Steinhagen, Hansrektor (at) tu-dresden.deUNSPECIFIED
Date:2013
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
DOI :[10.1016/j.applthermaleng.2013.03.008]
Publisher:Elsevier
ISSN:1359-4311
Status:In Press
Keywords:thermal energy storage, melting range, binary salt mixture, sodium nitrate, potassium nitrate
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Martin, Claudia
Deposited On:18 Apr 2013 12:40
Last Modified:06 Sep 2019 15:16

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