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Thermoanalytical investigation of some alkaline earth hydroxide hydrates on application as latent heat storage materials

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Abstract

Owing to their high specific melting enthalpy and the range of the melting temperatures the alkaline-earth hydroxide hydrates Ba(OH)2·8H2O and Sr(OH)2·8H2O are promising latent heat storage materials.

The investigations of the melting and solidification behaviour of Sr(OH)2·8H2O and its mixtures with Ba(OH)2·8H2O, which had been performed by means of DTA and DSC methods in the closed system with a constant gross composition lead to statements on the melting temperature and specific melting enthalpyvs. concentration. Theoretical storage densities of 532 MJ/m3 are obtained for the mixture of Ba(OH)2·8H2O and Sr(OH)2·8H2O (80/20) and a value of 655 MJ/m3 can be achieved for Sr(OH)2·8H2O. The kinetics of rehydration to the octahydrates has a great influence on the storage temperature and storage density.

Zusammenfassung

Entsprechend ihrer hohen spezifischen Schmelzenthalpie und dem Bereich der Schmelztemperaturen sind die Hydrate der Alkalierdmetallhydroxide Ba(OH)2·8H2O und Sr(OH)2·8H2O potentielle Umwandlungswärme-Speichersubstanzen.

Die mittels DTA- und DSC-Methoden durchgeführten Untersuchungen des Schmelz- und Erstarrungsverhaltens von Sr(OH)2·8H2O und seinen Gemischen mit Ba(OH)2·8H2O in einem geschlossenen System und mit einer konstanten Makrozusammensetzung führen zu Feststellungen über die Schmelztemperatur und die spezifische Schmelzwärme in Abhängigkeit von der Konzentration. Eine theoretische Speicherdichte von 532 MJ/m3 konnte für das Gemische aus 80% Ba(OH)2·8H2O und 20% Sr(OH)2·8H2O und ein Wert von 655 MJ/m3 für Sr(OH)2·8H2O ermittelt werden. Die Kinetik der Rehydratation zu den Oktahydraten besitzt einen großen Einfluß auf die Speichertemperatur und die Speicherdichte.

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Authors and Affiliations

  1. Setaram SA, Mendelejewstr. 5, 0-9200, Freiberg, FRG

    R. Naumann

  2. Schatz Thermo Engineering, Zugspitzstr. 64, W-8035, Gauting-München, FRG

    O. Schatz

Authors
  1. R. Naumann
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  2. O. Schatz
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Additional information

The authors would like to thank Dr. K. Köhnke, Bergakademie Freiberg, Fachbereich Chemie, for the performance of X-ray investigations.

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Naumann, R., Schatz, O. Thermoanalytical investigation of some alkaline earth hydroxide hydrates on application as latent heat storage materials. Journal of Thermal Analysis 38, 665–671 (1992). https://doi.org/10.1007/BF01979395

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