Eenhancing thermal properties of mono and binary nitrates by adding SiO<sub>2</sub> nanoparticles

XIONG Yaxuan; WANG Zhenyu; XU Peng; WU Yuting; DING Yulong; MA Chongfang

doi:10.11949/j.issn.0438-1157.20180267

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Eenhancing thermal properties of mono and binary nitrates by adding SiO₂ nanoparticles

更新时间：2025-12-10

- Eenhancing thermal properties of mono and binary nitrates by adding SiO₂ nanoparticles
- CIESC Journal Issue 10, Pages: 4418-4426(2018)
- 作者机构：
  
  1. 北京建筑大学供热供燃气通风及空调工程北京市重点实验室,北京,100044
  2. 北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京,100124
  3. 伯明翰大学能源存储中心, 英国B13.2TT
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180267
  CLC： B321
- Online First：05 October 2018，
  
  Published：05 October 2018
- 稿件说明：
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XIONG Yaxuan, WANG Zhenyu, XU Peng, et al. Eenhancing thermal properties of mono and binary nitrates by adding SiO₂ nanoparticles[J]. CIESC Journal, 2018, (10): 4418-4426. DOI: 10.11949/j.issn.0438-1157.20180267.
DOI：

XIONG Yaxuan, WANG Zhenyu, XU Peng, et al. Eenhancing thermal properties of mono and binary nitrates by adding SiO₂ nanoparticles[J]. CIESC Journal, 2018, (10): 4418-4426. DOI: 10.11949/j.issn.0438-1157.20180267. DOI：

摘要

熔盐作为相变材料，可以用作聚热太阳能电站中的储热介质，通过向基盐中添加不同比例的纳米材料可以显著增强熔盐的热物性。将20 nm的SiO2纳米颗粒分别分散到硝酸钾、硝酸钠和solar salt （60% NaNO3，40% KNO3，均为质量分数）中制备成稳定的纳米流体，制备的每一种纳米流体都经过溶解、超生、干燥蒸发等过程。采用差式扫描量热法测量熔盐的比热容、熔化潜热、熔点等热物理性质，并采用激光闪射法对基盐和纳米熔盐的热扩散系数进行测量和分析。结果表明，SiO2颗粒的添加对硝酸钠、硝酸钾和solar salt的熔化潜热、比热容和热导率等热物理性质有显著的影响。与基盐相比，solar salt、硝酸钾和硝酸钠在液态的比热容值分别增加了4.7%～15.89%、3.9%～33.5%、1.9%～11.86%；测得的热导率分别最大增加了17.16%、39.7%、9.5%。

Abstract

Molten salt as phase change materials can be used as thermal storage medium in concentrating solar power (CSP) system. It is possible to significantly improve the thermal properties of molten salt by adding nanoparticles to molten salt. Nanofluids were synthesized by dispersing 20 nm SiO2 particles to potassium nitrate

sodium nitrate

and solar salt (60% NaNO3 and 40% KNO3

mass fraction) respectively. Nanofluids were prepared by water-solution

sonication

and evaporation. The thermo-physical properties (latent heat

specific heat and molting point) of nonofluids were characterized by DSC method

and the thermal diffusivity was analyzed by laser flash apparatus (LFA). Results show that mass fraction of 20 nm SiO2 particles significantly enhanced latent heat

specific heat and thermal conductivities of potassium nitrate

sodium nitrate

and solar salt. Compared with base salt

the average specific heat improved of solar salt

potassium nitrate

sodium nitrate with 20 nm SiO2 nanoparticles was found to be 4.7%-15.89%

3.9%-33.5%

1.9%-11.86% in liquid

and the maximum thermal conductivity increased by a maximum of 17.16%

39.7%

and 9.5%

respectively.

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Eenhancing thermal properties of mono and binary nitrates by adding SiO2 nanoparticles

DOI：10.11949/j.issn.0438-1157.20180267

摘要

Abstract

关键词

Keywords

references

Eenhancing thermal properties of mono and binary nitrates by adding SiO₂ nanoparticles