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Research Papers: Heat Transfer Enhancement

Nanoparticle Dispersions on Ternary Nitrate Salts for Heat Transfer Fluid Applications in Solar Thermal Power

[+] Author and Article Information
Ramaprasath Devaradjane

Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019-0023

Donghyun Shin

Department of Mechanical and
Aerospace Engineering,
The University of Texas at Arlington,
Arlington, TX 76019-0023
e-mail: shin@uta.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 22, 2014; final manuscript received May 11, 2015; published online February 3, 2016. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 138(5), 051901 (Feb 03, 2016) (5 pages) Paper No: HT-14-1231; doi: 10.1115/1.4030903 History: Received April 22, 2014

In this study, we report enhancement in heat capacity of SiO2 nanoparticle dispersions in a molten ternary nitrate salt (NaNO3, KNO3, and Ca(NO3)2) to obtain an effective heat transfer fluid (HTF)/thermal energy storage (TES) for concentrated solar power (CSP) application. The enhanced heat capacity of the molten salt mixture is expected to greatly increase thermal storage density of HTF/TES, and thus the cost of electricity produced by CSP plant can be significantly reduced. A custom two-step method was used to synthesize SiO2 nanoparticle/ternary salt mixture. The nanoparticle concentration of the mixture was fixed at 1% by weight for comparison with the previous studies. A modulated differential scanning calorimeter (MDSC) was employed to measure heat capacity of the mixture, and it was found to be enhanced by ∼19% compared to the pure ternary salt.

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Figures

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Fig. 1

Nanofluid synthesis process

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Fig. 2

Variation of heat capacity with temperature for ternary salt and nanofluids

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Fig. 3

SEM image of pure ternary nitrate salt

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Fig. 4

SEM image of ternary nitrate salt doped with nanoparticles (nanofluid) showing weblike structures at nanoscale

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