Effect of MgO and SiO2 nanoparticles on specific heat capacity of binary carbonate eutectic

doi:10.11949/j.issn.0438-1157.20180564

CIESC Journal ›› 2018, Vol. 69 ›› Issue (12): 4959-4965.DOI: 10.11949/j.issn.0438-1157.20180564

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Effect of MgO and SiO₂ nanoparticles on specific heat capacity of binary carbonate eutectic

XIONG Yaxuan¹, WANG Zhenyu¹, XU Peng¹, WU Yuting², DING Yulong³, MA Chongfang²

1. Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conservation of Beijing Municipality, Beijing University of Technology, Beijing 100124, China;
3. Birmingham Center for Energy Storage, University of Birmingham, B15 2TT, UK

Received:2018-05-28 Revised:2018-08-28 Online:2018-12-05 Published:2018-12-05
Supported by:
supported by the Natural Science Foundation of Beijing (3151001) and the National Natural Science Foundation of China (51206004).

添加纳米MgO和SiO₂颗粒对二元碳酸盐(Li₂CO₃-K₂CO₃)比热容的影响

熊亚选¹, 王振宇¹, 徐鹏¹, 吴玉庭², 丁玉龙³, 马重芳²

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. 伯明翰大学伯明翰能源存储中心, 英国B15 2TT

通讯作者: 徐鹏
基金资助:
北京市自然科学基金重点项目（3151001）；国家自然科学基金项目（51206004）。

Abstract

Abstract:

As a new type of heat storage and heat transfer medium, molten salt has been widely used in concentrating solar power (CSP) system due to its wide working temperature range, relatively high specific and strong heat storage capacity. Increasing the specific heat capacity of the molten salt can significantly increase its heat storage density. Nanofluids were synthesized by dispersing 20 nm SiO₂ and MgO particles to binary carbonate eutectic (Li₂CO₃ and K₂CO₃). The specific heat capacity effect of nanoparticles on molten salt was characterized by DSC measurement. Results show that mass fraction of 20 nm nanoparticles significantly enhanced the specific heat of binary carbonate eutectic. Compared with the base salt, the average specific heat improved with 20 nm MgO and SiO₂ nanoparticles was found to be 27.5%-34.1%, 11%-20.7%, respectively. The change rate of the specific heat values of the two nanofluids is lower than 4.31% after multiple solid-liquid cycles. The molten salt nanofluids showed good thermal stability. The microstructure of nanofluids was characterized by scanning electron microscopy (SEM). The images of nanofluids in solid state showed that special nanostructures were formed on the surface of molten salts.

Key words: molten salts, nanopaticles, phase-change materials, specific heat capacity, thermal storage

摘要：

熔盐作为一种新型传热工质，由于其液体使用范围宽，比热容相对较高，蓄热能力强，已被广泛应用于聚热太阳能电站的储热传热介质，而通过增强熔盐的比热容可以显著提高其储热密度。将纳米SiO₂和MgO颗粒分别均匀分散到二元共晶碳酸盐（Li₂CO₃-K₂CO₃）中，制备出两种稳定的纳米流体，采用差式扫描量热法（DSC）分析纳米颗粒对熔盐比热容的影响。实验结果显示，添加20 nm的纳米颗粒对碳酸盐的比热容有显著影响：通过添加纳米MgO和SiO₂颗粒，纳米熔盐比热容相比基盐分别平均提高了27.5%～34.1%，11%～20.7%。经过多个固-液循环后，测得两种纳米流体的比热容变化率均低于4.31%，且具有良好的热稳定性。采用电子扫描显微镜表征纳米流体的微观结构，纳米流体在固态时的SEM图像显示在熔盐表面形成了特殊的纳米结构。

关键词: 熔盐, 纳米颗粒, 相变材料, 比热容, 储热

CLC Number:

TB321

XIONG Yaxuan, WANG Zhenyu, XU Peng, WU Yuting, DING Yulong, MA Chongfang. Effect of MgO and SiO₂ nanoparticles on specific heat capacity of binary carbonate eutectic[J]. CIESC Journal, 2018, 69(12): 4959-4965.

熊亚选, 王振宇, 徐鹏, 吴玉庭, 丁玉龙, 马重芳. 添加纳米MgO和SiO₂颗粒对二元碳酸盐(Li₂CO₃-K₂CO₃)比热容的影响[J]. 化工学报, 2018, 69(12): 4959-4965.

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Effect of MgO and SiO₂ nanoparticles on specific heat capacity of binary carbonate eutectic

添加纳米MgO和SiO₂颗粒对二元碳酸盐(Li₂CO₃-K₂CO₃)比热容的影响

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