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  Thermal conductivity measurements of magnesium hydride powder beds under operating conditions for heat storage applications

Albert, R., Urbanczyk, R., & Felderhoff, M. (2019). Thermal conductivity measurements of magnesium hydride powder beds under operating conditions for heat storage applications. International Journal of Hydrogen Energy, 44(55), 29273-29281. doi:10.1016/j.ijhydene.2019.01.218.

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 Creators:
Albert, Rene1, Author           
Urbanczyk, Robert1, 2, Author           
Felderhoff, Michael1, Author           
Affiliations:
1Research Group Felderhoff, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_3027887              
2Institut für Energie- und Umwelttechnik e.V., Bliersheimer Straße 58-60, 47229 Duisburg, Germany, ou_persistent22              

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Free keywords: Effective thermal conductivity measurement; Transient plane source method; Magnesium hydride; Heat storage
 Abstract: One of the major issues of the change in energy politics is the storage of renewable energy in order to facilitate a continuous energy supply to the grid. An efficient way to store energy (heat) is provided by the usage of Thermochemical Energy Storage (TES) in metal hydrides. Energy is stored in dehydrogenated metal hydrides and can be released by hydrogenation for consumption. One prominent candidate for high temperature (400 °C) heat storage is magnesium hydride. It is a well-known and investigated material which shows high cycling stability over hundreds of cycles. It is an abundant material, non-toxic and easy to prepare in bigger scales. One of the major drawbacks for heat storage applications is the low heat transfer capability of packed beds of magnesium hydrides. In this work we present results of effective thermal conductivity (ETC) which were measured under hydrogen pressure up to 25 bar and temperatures up to 410 °C in order to meet the operating conditions of magnesium hydride as a thermochemical heat storage material. We could show that the effective thermal conductivity of a magnesium hydride – hydrogen system at 410 °C and 25 bar hydrogen increases by 10% from 1.0 W m−1 K−1 to 1.1 W m−1 K−1 after 18 discharging and charging cycles. In dehydrogenated magnesium hydride this increase of the thermal conductivity was found to be at 50% from 1.20 W m−1 K−1 to 1.80 W m−1 K−1 at 21 bar hydrogen. These data are very important for the design and construction of heat storage tanks based on high temperature metal hydrides in the future.

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Language(s): eng - English
 Dates: 2018-11-212019-01-242019-02-232019-11-08
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.ijhydene.2019.01.218
 Degree: -

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Title: International Journal of Hydrogen Energy
  Other : Int. J. Hydrog. Energy
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 44 (55) Sequence Number: - Start / End Page: 29273 - 29281 Identifier: ISSN: 0360-3199
CoNE: https://pure.mpg.de/cone/journals/resource/954925521672