Thermal storage of nitrate salts as Phase Change Materials (PCMs)
Autores
Orozco, Marco A.; Acurio, Karen; Martínez Gómez, Javier; Vásquez Aza, Francis; Chico Proano, AndrésIdentificadores
Enlace permanente (URI): http://hdl.handle.net/10017/50619DOI: 10.3390/ma14237223
ISSN: 1996-1944
Editor
MDPI
Fecha de publicación
2021-11-26Cita bibliográfica
Orozco, M.A., Acurio, K., Vásquez-Aza, F., Martínez-Gómez, J. & Chico-Proano, A. 2021, "Thermal storage of nitrate salts as Phase Change Materials (PCMs)", Materials, vol. 14, no. 23, art. no. 7223.
Palabras clave
Inorganic PCMs
Thermal storage
Nitrate salt mixtures
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Versión del editor
https://doi.org/10.3390/ma14237223Derechos
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
This study presents the energy storage potential of nitrate salts for specific applications in energy systems that use renewable resources. For this, the thermal, chemical, and morphological characterization of 11 samples of nitrate salts as phase change materials (PCM) was conducted. Specifically, sodium nitrate (NaNO3), sodium nitrite (NaNO2), and potassium nitrate (KNO3) were considered as base materials; and various binary and ternary mixtures were evaluated. For the evaluation of the materials, differential Fourier transform infrared spectroscopy (FTIR), scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) to identify the temperature and enthalpy of phase change, thermal stability, microstructure, and the identification of functional groups were applied. Among the relevant results, sodium nitrite presented the highest phase change enthalpy of 220.7 J/g, and the mixture of 50% NaNO3 and 50% NaNO2 presented an enthalpy of 185.6 J/g with a phase change start and end temperature of 228.4 and 238.6 °C, respectively. This result indicates that sodium nitrite mixtures allow the thermal storage capacity of PCMs to increase. In conclusion, these materials are suitable for medium and high-temperature thermal energy storage systems due to their thermal and chemical stability, and high thermal storage capacity.
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