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      Thermophysical Characterization of MgCl 2·6H 2O, Xylitol and Erythritol as Phase Change Materials (PCM) for Latent Heat Thermal Energy Storage (LHTES)

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          Abstract

          The application range of existing real scale mobile thermal storage units with phase change materials (PCM) is restricted by the low phase change temperature of 58 C for sodium acetate trihydrate, which is a commonly used storage material. Therefore, only low temperature heat sinks like swimming pools or greenhouses can be supplied. With increasing phase change temperatures, more applications like domestic heating or industrial process heat could be operated. The aim of this study is to find alternative PCM with phase change temperatures between 90 and 150 C . Temperature dependent thermophysical properties like phase change temperatures and enthalpies, densities and thermal diffusivities are measured for the technical grade purity materials xylitol (C 5 H 12 O 5 ), erythritol (C 4 H 10 O 4 ) and magnesiumchloride hexahydrate (MCHH, MgCl 2 · 6H 2 O). The sugar alcohols xylitol and erythritol indicate a large supercooling and different melting regimes. The salt hydrate MgCl 2 · 6H 2 O seems to be a suitable candidate for practical applications. It has a melting temperature of 115.1 ± 0.1 C and a phase change enthalpy of 166.9 ± 1.2 J / g with only 2.8 K supercooling at sample sizes of 100 g . The PCM is stable over 500 repeated melting and solidification cycles at differential scanning calorimeter (DSC) scale with only small changes of the melting enthalpy and temperature.

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          Most cited references38

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          Review on sustainable thermal energy storage technologies, Part I: heat storage materials and techniques

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            Differential Scanning Calorimetry

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              Thermal energy storage (TES) for industrial waste heat (IWH) recovery: A review

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                24 April 2017
                April 2017
                : 10
                : 4
                Affiliations
                Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany; Andreas.Koenig-Haagen@ 123456uni-bayreuth.de (A.K.-H.); brueggemann@ 123456uni-bayreuth.de (D.B.)
                Author notes
                [* ]Correspondence: Stephan.Hoehlein@ 123456uni-bayreuth.de ; Tel.: +49-921-55-7520
                Article
                materials-10-00444
                10.3390/ma10040444
                5506912
                70bfdb4a-8e5e-4803-b7af-154ef9c85862
                © 2017 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                Categories
                Article

                phase change material,thermal energy storage,latent heat storage,salt hydrate,sugar alcohol,properties,waste heat,dsc,thermal diffusivity,density

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