A comparison of radial-flow and axial-flow packed beds for thermal energy storage
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McTigue, J., & White, A. (2017). A comparison of radial-flow and axial-flow packed beds for thermal energy storage. Applied Energy https://doi.org/10.1016/j.apenergy.2017.08.179
Packed-bed thermal reservoirs are an integral component in a number of electrical energy storage technologies. The present paper concentrates on packed beds where the heat transfer fluid travels along the radial co-ordinate. The governing energy equations and various mechanisms that cause exergetic losses are discussed. The radial-flow packed bed is compared to a dimensionally similar axial-flow packed bed. This approach provides a fair assessment of the underlying behaviour of the two designs. Multi-objective optimisation allows a wide range of design variables to be considered, and is employed to compare optimal radial-flow and axial-flow stores. Axial-flow stores that have been segmented into layers are also considered. The results indicate that radial-flow stores have a comparable thermodynamic performance, but that the additional volume required for by-pass flows leads to higher capital costs.
thermal energy storage, packed beds, heat transfer, exergetic loss, optimisation
The work described in this paper was undertaken as part of a project funded by the UK Engineering and Physical Sciences Research Council (EPSRC Grant No. EP/J006246/1). The first author was supported by an EPSRC-funded studentship. All authors gratefully acknowledge this support.
External DOI: https://doi.org/10.1016/j.apenergy.2017.08.179
This record's URL: https://www.repository.cam.ac.uk/handle/1810/268181
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