Use of polyethylene glycol for the improvement of the cycling stability of bischofite as thermal energy storage material

Andrea Gutierrez, Svetlana Ushak, Hector Galleguillos, Angel Fernandez, Luisa F. Cabeza and Mario Grágeda

Applied Energy, 2015, vol. 154, issue C, 616-621

Abstract: Bischofite is a by-product of the non-metallic mining industry. It has been evaluated as phase change material in thermal energy storage, but it shows little cycling stability, therefore in this paper the mixture of bischofite with an additive was studied. Since polyethylene glycol (PEG) is a PCM itself, in this paper PEG (with different molecular weights) is used as additive in a PCM (bischofite) to improve its thermal behaviour. Results show that adding 5% PEG 2000 to bischofite gives a more cycling stable PCM without affecting its melting temperature neither decreasing significantly its heat of fusion. This research shows that mixing an inorganic PCM with an organic additive can be a good option to improve the thermal performance of the PCM.

Keywords: Bischofite; Phase change material (PCM); Latent heat; Thermal energy storage (TES); Polyethylene glycol (PEG); Cycling stability (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2015.05.040

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