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Title: Degradation of fatty acid phase‐change materials (PCM): new approach for its characterization
Author: Majó, Marc
Sánchez, Ricard
Barcelona Pons, Pol
García Gómez, Jordi
Fernández Renna, Ana Inés
Barreneche, Camila
Keywords: Emmagatzematge d'energia tèrmica
Àcids grassos
Ciència dels materials
Heat storage
Fatty acids
Materials science
Issue Date: 12-Feb-2021
Publisher: MDPI
Abstract: The use of adequate thermal energy storage (TES) systems is an efficient way to achieve thermal comfort in buildings reducing the cooling and heating demand. Besides, deploy phase change materials (PCM) to meet and enhance the TES needs is highly effective and widely studied. In this paper, a study of the degradation of two fatty acids is presented, capric and myristic acids, in order to evaluate whether their thermo‐physical properties are affected throughout time during service. This was carried out by means of two different types of thermal treatments: degradation at constant temperature (thermal stability test), 60 °C during 100 h and 500 h, and degradation with heating and cooling cycling (thermal cycling stability), between a temperature range from 15 °C to 70 °C with 0.5 °C/min ramp during 500 and 1000 cycles. Despite no significant changes were meas‐ ured for myristic acid, experimental results revealed a decrease of melting enthalpy of 6.6% in capric acid thermally treated for 500 h. Evidences of chemical degradation were found that might explain the decrease in thermophysical properties during use.
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It is part of: Molecules, 2021, vol. 26, num. 4, p. 982
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ISSN: 1420-3049
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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