Thermal-physical properties of nanoparticle-seeded nitrate molten salts
Thermal-physical properties of nanoparticle-seeded nitrate molten salts
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DOI：
10.1016/j.renene.2017.12.026
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发表时间：
2018-05-01
期刊：
影响因子：
8.7
通讯作者：
Wen, Dongsheng
中科院分区：
文献类型：
--
作者：
Awad, Afrah;Navarro, Helena;Wen, Dongsheng
熔盐作为储能材料得到了广泛的应用，但其比热容、热导率等热物理性质限制了其应用。在这项研究中，硝酸钾和硝酸钠-钾（NaNO 3：KNO 3，60：40摩尔比）作为碱盐和不同类型的纳米粒子，这是氧化铁（Fe 2 O3），二氧化钛（TiO 2）和氧化铜（CuO），分散形成各种纳米盐。采用激光闪光分析法和动态扫描量热法测量了熔融盐和纳米盐在773 K以下的较宽温度范围内的比热、潜热和熔化温度。向硝酸钾钠盐中添加Fe 2 O3将有效热扩散率提高至50%。对于1wt%的CuO-二元硝酸盐，潜热的最高增加达到14.45%。纳米盐的总热能储存增加高达6%，包括显热和潜热，这是由于纳米颗粒和盐之间的界面层的形成。通过扫描电子显微镜测量的纳米盐的形态显示纳米颗粒的非均质分散体，包括可能导致性能下降的聚集区域。(C)2017由Elsevier Ltd.出版
Molten salts have been used extensively as energy storing materials, however, their thermophysical properties, such as specific heat capacity and thermal conductivity have limited their applications. In this study, potassium nitrate and sodium-potassium nitrate (NaNO3:KNO3 with 60:40 molar ratio) are used as the base salts and different types of nanoparticles, which are iron oxide (Fe2O3), titanium dioxide (TiO2) and copper oxide (CuO), are dispered to form various nanosalts. Laser flash analysis is used to measure thermal diffusivity and dynamic scanning calorimeter for specific heat, latent heat and melting temperature of the molten salts and nanosalts over a wide range of temperature up to 773 K. The addition of Fe203 into sodium potassium nitrate salt increases the effective thermal diffusivity up to 50%. The highest increase in the latent heat reaches 14.45% for 1 wt % CuO-binary nitrate salt. The total thermal energy storage of nanosalt increases up to 6% including both sensible and latent heat, which is due to the formation of the interface layer between nanoparticles and salts. The morphology of nanosalt measured by scanning electron microscopy shows a heterogeneous dispersion of nanoparticles, including agglomerated areas that could be responsible for the degradation of the performance. (C) 2017 Published by Elsevier Ltd.