Accelerated testing methods to analyse long term stability of a Phase Change Material under the combined effect of shear stress and thermal cycling
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The authors gratefully acknowledge to European Regional Development Fund and Ministerio de Ciencia e Innovación - Agencia Estatal de Investigación for the financial support of the project ALTES: “Active Latent Thermal Energy Storage”, Ref. PGC2018-100864-B-C21.Realizado en/con
Universidad Politécnica de Cartagena; Universidad Politécnica de CartagenaFecha de publicación
2022-10-25Editorial
ELSEVIERCita bibliográfica
A. Egea, A. García, R. Herrero-Martín, J. Pérez-García, Accelerated testing methods to analyse long term stability of a Phase Change Material under the combined effect of shear stress and thermal cycling, Journal of Energy Storage, Volume 56, Part A, 2022, 105867, ISSN 2352-152X, https://doi.org/10.1016/j.est.2022.105867.Revisión por pares
SIPalabras clave
Phase change materialScraped surface heat exchanger
Shear stress
Accelerated thermal and scraping cycling
Long-term stability
Resumen
The long-term stability of a Phase Change Material (PCM) is a key point for its selection in energy storage devices. This work studies the suitability of a commercial paraffin wax in an active scraped surface heat exchanger for solar energy storage purposes. In these devices, the continuous scraping of inner walls during solidification removes PCM and increases the released heat. Hence, the PCM is affected by a high level of shear stress. In order to study a potential degradation of the paraffin, a novel accelerated procedure has been designed for obtaining samples with a different number of thermal and scraping cycles. The procedure allows to evaluate the effect of shear stresses, thermal cycles and their combined effects separately. Up to 3000 cycles have been generated, which accounts for around 8 years of continuous daily work in the heat exchanger. The measurements through Differential Scanning Calorimetry, rheometry and thermal conductivity analysis have shown that neither the ...
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