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Title
Evaluation of thermophysical properties for thermal energy storage materials - determining factors, prospects and limitations / by Daniel Lager
AuthorLager, Daniel
CensorWerner, Andreas
Thesis advisorWeinberger, Peter
PublishedWien, 2017
Descriptionxii, 149, 3 Seiten : Illustrationen, Diagramme
Institutional NoteTechnische Universität Wien, Dissertation, 2017
LanguageEnglish
Bibl. ReferenceOeBB
Document typeDissertation (PhD)
Keywords (EN)thermophysical properties / thermal energy storage
Keywords (GND)Energiespeicher / Thermophysikalische Eigenschaft / Wärmespeicher / Thermophysikalische Eigenschaft
URNurn:nbn:at:at-ubtuw:1-106841 Persistent Identifier (URN)
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 The work is publicly available
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Evaluation of thermophysical properties for thermal energy storage materials - determining factors, prospects and limitations [17.15 mb]
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Abstract (English)

Thermal Energy Storage (TES) is representing a promising technology for energy conservation and utilizing fluctuating renewable energy sources and waste heat. While Sensible Thermal Energy Storage (STES) systems make use of the enthalpy change due to heat capacity and temperature gradient, Latent Thermal Energy Storage (LTES) systems utilize phase change enthalpies of different phase transitions and Thermochemical Energy Storage (TCES) systems use the heat of chemical reactions or sorption of the storage material. LTES and TCES promise higher energy densities based on higher enthalpy changes during phase transitions or chemical reactions at different temperature levels compared to STES. Due to that, a detailed knowledge of the thermophysical properties is needed, in order to identify the actual energy density but also thermal transport and thermal expansion of the observed storage material. In this work, a literature review on already published TES materials and their thermophysical properties is done. Furthermore the state-of-the art in measurement methodologies for thermophysical properties is shown and applied to different Phase Change Material (PCM) and Thermochemical Material (TCM). Focusing on specific heat capacity, phase transition enthalpy, reaction enthalpy, thermal expansion, density, thermal diffusivity and thermal conductivity, different already standardized but also new measurement methodologies were conducted, compared and evaluated.

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