Experimental investigation of the specific heat of a nitrate-alumina nanofluid for solar thermal energy storage systems

Michael Schuller, Qian Shao, Thomas Lalk

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We measured the change in specific heat of nitrate salt-alumina nanoparticle nanofluids at low nanoparticle concentration (less than 2% by mass) to understand how adding small amounts of nanoparticles affected this property. Alumina nanoparticles were dispersed in a eutectic of sodium nitrate and potassium nitrate (60:40 mole fraction) to create nanofluids using a two-step method. Neutron activation analysis was used to measure the actual mass fraction of the alumina nanoparticles in the nanofluids. The nominal mass fraction was always larger than the actual mass fraction, with differences up to 41%. The specific heat was measured using a modulated differential scanning calorimeter (MDSC). The results showed that there exists a parabolic relation between specific heat and mass fraction of alumina nanoparticles (maximum 30.6% enhancement at 0.78% actual mass fraction of alumina nanoparticles). The measurement uncertainty for the specific heat values was less than 4%. The stability of the specific heat values of the nanofluids was also examined; we found the nanoparticle concentration with the highest specific heat value shifted from 0.78% to 0.3% when the same samples were tested after one and two months.

Original languageEnglish
Pages (from-to)142-145
Number of pages4
JournalInternational Journal of Thermal Sciences
Volume91
DOIs
Publication statusPublished - 2015
Externally publishedYes

Fingerprint

heat storage
Thermal energy
Energy storage
Specific heat
nitrates
Nitrates
Alumina
aluminum oxides
specific heat
Nanoparticles
nanoparticles
potassium nitrates
sodium nitrates
neutron activation analysis
Neutron activation analysis
Calorimeters
eutectics
Eutectics
calorimeters
Potassium

Keywords

  • Nanofluid
  • Specific heat
  • Thermal energy storage

ASJC Scopus subject areas

  • Engineering(all)
  • Condensed Matter Physics

Cite this

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abstract = "We measured the change in specific heat of nitrate salt-alumina nanoparticle nanofluids at low nanoparticle concentration (less than 2{\%} by mass) to understand how adding small amounts of nanoparticles affected this property. Alumina nanoparticles were dispersed in a eutectic of sodium nitrate and potassium nitrate (60:40 mole fraction) to create nanofluids using a two-step method. Neutron activation analysis was used to measure the actual mass fraction of the alumina nanoparticles in the nanofluids. The nominal mass fraction was always larger than the actual mass fraction, with differences up to 41{\%}. The specific heat was measured using a modulated differential scanning calorimeter (MDSC). The results showed that there exists a parabolic relation between specific heat and mass fraction of alumina nanoparticles (maximum 30.6{\%} enhancement at 0.78{\%} actual mass fraction of alumina nanoparticles). The measurement uncertainty for the specific heat values was less than 4{\%}. The stability of the specific heat values of the nanofluids was also examined; we found the nanoparticle concentration with the highest specific heat value shifted from 0.78{\%} to 0.3{\%} when the same samples were tested after one and two months.",
keywords = "Nanofluid, Specific heat, Thermal energy storage",
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AU - Shao, Qian

AU - Lalk, Thomas

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N2 - We measured the change in specific heat of nitrate salt-alumina nanoparticle nanofluids at low nanoparticle concentration (less than 2% by mass) to understand how adding small amounts of nanoparticles affected this property. Alumina nanoparticles were dispersed in a eutectic of sodium nitrate and potassium nitrate (60:40 mole fraction) to create nanofluids using a two-step method. Neutron activation analysis was used to measure the actual mass fraction of the alumina nanoparticles in the nanofluids. The nominal mass fraction was always larger than the actual mass fraction, with differences up to 41%. The specific heat was measured using a modulated differential scanning calorimeter (MDSC). The results showed that there exists a parabolic relation between specific heat and mass fraction of alumina nanoparticles (maximum 30.6% enhancement at 0.78% actual mass fraction of alumina nanoparticles). The measurement uncertainty for the specific heat values was less than 4%. The stability of the specific heat values of the nanofluids was also examined; we found the nanoparticle concentration with the highest specific heat value shifted from 0.78% to 0.3% when the same samples were tested after one and two months.

AB - We measured the change in specific heat of nitrate salt-alumina nanoparticle nanofluids at low nanoparticle concentration (less than 2% by mass) to understand how adding small amounts of nanoparticles affected this property. Alumina nanoparticles were dispersed in a eutectic of sodium nitrate and potassium nitrate (60:40 mole fraction) to create nanofluids using a two-step method. Neutron activation analysis was used to measure the actual mass fraction of the alumina nanoparticles in the nanofluids. The nominal mass fraction was always larger than the actual mass fraction, with differences up to 41%. The specific heat was measured using a modulated differential scanning calorimeter (MDSC). The results showed that there exists a parabolic relation between specific heat and mass fraction of alumina nanoparticles (maximum 30.6% enhancement at 0.78% actual mass fraction of alumina nanoparticles). The measurement uncertainty for the specific heat values was less than 4%. The stability of the specific heat values of the nanofluids was also examined; we found the nanoparticle concentration with the highest specific heat value shifted from 0.78% to 0.3% when the same samples were tested after one and two months.

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