The aim of this study is to identify key factors limiting efficiency of pumped heat energy storage systems and determine some general features of transient behavior of solid state, sensible heat storages. Moreover, it aimed at establishing a feasible approach to transient conjugate heat transfer (CHT) analyses for such applications.
A zero-dimensional analytical model is used to determine the system efficiency sensitivity to efficiency of its components. Analysis of argon gas flow in an exemplary configuration of layered bed thermal energy storage is presented. The analysis incorporates a unsteady reynolds averaged navier stokes model with conjugate heat transfer between gas and solid storage core.
It is established that exergetic efficiency of the heat storage is one of the key factors for the system’s overall performance. Three full cycles of storage charging and discharging having 17 h physical time in total are simulated, with calculation of exergetic efficiency for each of the cycles. From standpoint of the system efficiency, it is concluded that the presented heat storage kind has limited exergetic efficiency because of severe temperature drop at the solid–fluid interface in comparison to granular kind of heat storage devices. From the methodological standpoint, it is concluded that calculating the exergetic efficiency of the heat storage by direct computational fluid dynamics (CFD) analysis requires significant amount of walltime and computational resources.
The paper presents unconventional approach to using standard CFD tools by exploiting numerical diffusion to numerically suppress high-frequency solution oscillations. This strategy grants that the analysis, otherwise requiring impractically long computation walltime, is completed within a practical time.
This research was supported in part by PLGrid Infrastructure.
Corrigendum: It has come to the attention of the publisher that the article Ziegler, B., Mosiężny, J. and Czyżewski, P. (2019), “Unsteady CHT analysis of a solid state, sensible heat storage for PHES system”, published in the International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print, has omitted a reference to a previous source that is drawn upon in the work.
The source is: Bartosz Ziegler, Jędrzej Mosiężny and Paweł Czyżewski, ‘Numerical study of heat and mass flow in layered heat storage’, MATEC Web Conf., 240 (2018) 01041, DOI: https://doi.org/10.1051/matecconf/201824001041
The author guidelines for the International Journal of Numerical Methods for Heat & Fluid Flow state that articles must be fully referenced. The authors sincerely apologise for this.
Ziegler, B., Mosiężny, J. and Czyżewski, P. (2020), "Unsteady CHT analysis of a solid state, sensible heat storage for PHES system", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 6, pp. 3199-3209. https://doi.org/10.1108/HFF-11-2018-0701
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