Thermal energy storage of molten salt –based nanofluid containing nano-encapsulated metal alloy phase change materials

Nuria Navarrete, Rosa Mondragón*, Dongsheng Wen, Maria Elena Navarro, Yulong Ding, J. Enrique Juliá

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)
185 Downloads (Pure)


The availability of Thermal Energy Storage systems in Concentrated Solar Power plants makes them suitable to handle the gap between energy supply and power demand. Increasing the total thermal energy storage capacity of the Thermal Energy Storage materials used is of interest to improve their efficiency. In this work the thermal energy storage of the so called solar salt (60% NaNO3 - 40% KNO3) was improved by adding a phase change material composed of Al-Cu alloy nanoencapsulated with an aluminium oxide layer naturally formed when exposed to oxygen. The resistance of the oxide shell to thermal cycling up to 570 °C and its compatibility with the molten salt were proved. The specific heat and the total thermal energy storage were evaluated at different solid mass loads. Although the specific heat and thus the sensible heat storage decreases with solid content, the contribution of the phase change enthalpy and the latent heat storage can increase the total thermal energy storage up to a 17.8% at constant volume basis comparison. Besides, the thermal conductivity of the nanofluid was increased when adding the nanoparticles improving its heat transfer performance under some particular conditions.

Original languageEnglish
Pages (from-to)912-920
Number of pages9
Early online date12 Nov 2018
Publication statusPublished - 15 Jan 2019

Bibliographical note

Funding Information:
This work has been partially funded by Ministerio de Economía y Competitividad (MINECO) though the project ENE2016-77694-R and Universitat Jaume I through the project UJI-B2016-47. Nuria Navarrete thanks Universitat Jaume I for a pre-doctoral fellowship (FPI-UJI program) Ref. PREDOC/2016/28 . Authors thank Servicios Centrales de Instrumentacion Científica (SCIC) of Universitat Jaume I for the use of DSC (Cristina Zahonero), TEM (Maria del Carmen Peiro) and SEM (Javier Gómez). This work has been developed by participants of the COST Action CA15119 Overcoming Barriers to Nanofluids Market Uptake (NANOUPTAKE).

Publisher Copyright:
© 2018 Elsevier Ltd


  • Nanofluids
  • Phase change enthalpy
  • Specific heat
  • Thermal conductivity
  • Thermal storage

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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