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Research on thermal properties of novel silica nanoparticle/binary nitrate/expanded graphite composite heat storage blocks

Yu, Q. ; Lu, Yuanwei ; Zhang, Cancan ; Wu, Yuting and Sunden, B. LU (2019) In Solar Energy Materials and Solar Cells 201(Oct.).
Abstract

In order to study the effects of EG (expanded graphite) content and SiO2 nanoparticles on the specific heat and thermal conductivity of nano-SiO2/NaNO3–KNO3/EG composite heat storage materials, a series of nano-SiO2/NaNO3–KNO3/EG composites are prepared by the aqueous solution-ultrasound oscillation method. The nano-SiO2/NaNO3–KNO3 and EG with different mass fractions (5%, 10%, 15% and 20%) are used as heat storage material and matrix material, respectively. The specific heat and thermal conductivity of the composite are measured by STA (Simultaneous Thermal Analysis) and LFA (Laser Flash Apparatus), respectively. The results... (More)

In order to study the effects of EG (expanded graphite) content and SiO2 nanoparticles on the specific heat and thermal conductivity of nano-SiO2/NaNO3–KNO3/EG composite heat storage materials, a series of nano-SiO2/NaNO3–KNO3/EG composites are prepared by the aqueous solution-ultrasound oscillation method. The nano-SiO2/NaNO3–KNO3 and EG with different mass fractions (5%, 10%, 15% and 20%) are used as heat storage material and matrix material, respectively. The specific heat and thermal conductivity of the composite are measured by STA (Simultaneous Thermal Analysis) and LFA (Laser Flash Apparatus), respectively. The results show that nano-SiO2/NaNO3–KNO3/EG composite exhibits obvious better performance than pure binary nitrate NaNO3–KNO3. With 15 wt% EG, the average specific heat (from 250 °C to 430 °C) and thermal conductivity of the composite are 2.574 J/(g·K) and 6.05 W/(m·K), respectively, which are 1.69 times and 9 times higher than that of pure binary nitrate. After adding 1 wt% nano-SiO2 to NaNO3–KNO3/EG (15 wt%) composite, the average specific heat and thermal conductivity increase by 44% and 60.9%, respectively. From the above results, the composite heat storage materials prepared by adding EG and nano-SiO2 into binary nitrate are considered as promising candidate materials for high heat transfer performance.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Binary nitrate, Expanded graphite, Nanoparticles, Specific heat, Thermal conductivity
in
Solar Energy Materials and Solar Cells
volume
201
issue
Oct.
article number
110055
publisher
Elsevier
external identifiers
  • scopus:85069677878
ISSN
0927-0248
DOI
10.1016/j.solmat.2019.110055
language
English
LU publication?
yes
id
4b2e64d4-a1b3-4844-be44-e5510871402f
date added to LUP
2019-08-30 09:47:59
date last changed
2023-11-19 13:13:32
@article{4b2e64d4-a1b3-4844-be44-e5510871402f,
  abstract     = {{<p>In order to study the effects of EG (expanded graphite) content and SiO<sub>2</sub> nanoparticles on the specific heat and thermal conductivity of nano-SiO<sub>2</sub>/NaNO<sub>3</sub>–KNO<sub>3</sub>/EG composite heat storage materials, a series of nano-SiO<sub>2</sub>/NaNO<sub>3</sub>–KNO<sub>3</sub>/EG composites are prepared by the aqueous solution-ultrasound oscillation method. The nano-SiO<sub>2</sub>/NaNO<sub>3</sub>–KNO<sub>3</sub> and EG with different mass fractions (5%, 10%, 15% and 20%) are used as heat storage material and matrix material, respectively. The specific heat and thermal conductivity of the composite are measured by STA (Simultaneous Thermal Analysis) and LFA (Laser Flash Apparatus), respectively. The results show that nano-SiO<sub>2</sub>/NaNO<sub>3</sub>–KNO<sub>3</sub>/EG composite exhibits obvious better performance than pure binary nitrate NaNO<sub>3</sub>–KNO<sub>3</sub>. With 15 wt% EG, the average specific heat (from 250 °C to 430 °C) and thermal conductivity of the composite are 2.574 J/(g·K) and 6.05 W/(m·K), respectively, which are 1.69 times and 9 times higher than that of pure binary nitrate. After adding 1 wt% nano-SiO<sub>2</sub> to NaNO<sub>3</sub>–KNO<sub>3</sub>/EG (15 wt%) composite, the average specific heat and thermal conductivity increase by 44% and 60.9%, respectively. From the above results, the composite heat storage materials prepared by adding EG and nano-SiO<sub>2</sub> into binary nitrate are considered as promising candidate materials for high heat transfer performance.</p>}},
  author       = {{Yu, Q. and Lu, Yuanwei and Zhang, Cancan and Wu, Yuting and Sunden, B.}},
  issn         = {{0927-0248}},
  keywords     = {{Binary nitrate; Expanded graphite; Nanoparticles; Specific heat; Thermal conductivity}},
  language     = {{eng}},
  number       = {{Oct.}},
  publisher    = {{Elsevier}},
  series       = {{Solar Energy Materials and Solar Cells}},
  title        = {{Research on thermal properties of novel silica nanoparticle/binary nitrate/expanded graphite composite heat storage blocks}},
  url          = {{http://dx.doi.org/10.1016/j.solmat.2019.110055}},
  doi          = {{10.1016/j.solmat.2019.110055}},
  volume       = {{201}},
  year         = {{2019}},
}