Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/
Title (Primary) Non-equilibrium thermochemical heat storage in porous media: Part 1 – Conceptual model
Author Nagel, T.; Shao, H. ORCID logo ; Singh, A.K.; Watanabe, N.; Roßkopf, C.; Linder, M.; Wörner, A.; Kolditz, O. ORCID logo
Journal Energy
Year 2013
Department ENVINF
Volume 60
Page From 254
Page To 270
Language englisch
Keywords Thermochemical heat storage; concentrated solar power; porous media; reactive transport; thermal non-equilibrium; finite element
UFZ wide themes RU5;
Abstract Thermochemical energy storage can play an important role in the establishment of a reliable renewable
energy supply and can increase the efficiency of industrial processes. The application of
directly permeated reactive beds leads to strongly coupled mass and heat transport processes that
also determine reaction kinetics. To advance this technology beyond the laboratory stage requires
a thorough theoretical understanding of the multiphysics phenomena and their quantification on a
scale relevant to engineering analyses. Here, the theoretical derivation of a macroscopic model for
multicomponent compressible gas flow through a porous solid is presented along with its finite element
implementation where solid-gas reactions occur and both phases have individual temperature
fields. The model is embedded in the Theory of Porous Media and the derivation is based on the
evaluation of the Clausius-Duhem inequality. Special emphasis is placed on the interphase coupling
via mass, momentum and energy interaction terms and their effects are partially illustrated using
numerical examples. Novel features of the implementation of the described model are verified via
comparisons to analytical solutions. The specification, validation and application of the full model
to a calcium hydroxide/calcium oxide based thermochemical storage system is the subject of part
2 of this study.
Persistent UFZ Identifier
Nagel, T., Shao, H., Singh, A.K., Watanabe, N., Roßkopf, C., Linder, M., Wörner, A., Kolditz, O. (2013):
Non-equilibrium thermochemical heat storage in porous media: Part 1 – Conceptual model
Energy 60 , 254 - 270