Effects of carrier on characteristics of NaNO<sub>3</sub>/diatomite composite phase change materials for thermal energy storage

ZHENG Lifang; LENG Guanghui; NIE Binjian; JIANG Zhu; DING Yulong

doi:10.11949/j.issn.0438-1157.20170733

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Effects of carrier on characteristics of NaNO₃/diatomite composite phase change materials for thermal energy storage

更新时间：2025-12-10

- Effects of carrier on characteristics of NaNO₃/diatomite composite phase change materials for thermal energy storage
- CIESC Journal Issue 11, Pages: 4428-4436(2017)
- 作者机构：
  
  1. 北京科技大学机械工程学院,北京,100083
  2. 英国伯明翰大学储能研究中心, 伯明翰 B12.2TT
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170733
  CLC： Q33TK02
- Online First：05 November 2017，
  
  Published：05 November 2017
- 稿件说明：
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ZHENG Lifang, LENG Guanghui, NIE Binjian, et al. Effects of carrier on characteristics of NaNO₃/diatomite composite phase change materials for thermal energy storage[J]. CIESC Journal, 2017, (11): 4428-4436. DOI: 10.11949/j.issn.0438-1157.20170733.
DOI：

ZHENG Lifang, LENG Guanghui, NIE Binjian, et al. Effects of carrier on characteristics of NaNO₃/diatomite composite phase change materials for thermal energy storage[J]. CIESC Journal, 2017, (11): 4428-4436. DOI: 10.11949/j.issn.0438-1157.20170733. DOI：

摘要

采用混合烧结工艺，通过改变硅藻土载体材料的质量分数制备5种不同参数的NaNO3/硅藻土复合相变储热材料（CPCM）样品，并对其进行抗压强度测试、热物性测试、能谱表征、微观形貌观察及热性能分析。当硅藻土质量分数从30%增加到35%和40%时，样品抗压强度随之增加，表现出脆性材料特征，当达到45%和50%时，则表现出塑性材料特征。硅藻土的加入和混合烧结处理对NaNO3的相变几乎没有影响。样品的热导率随温度升高而降低，在同一温度条件下，样品热导率均随硅藻土质量分数的升高基本呈上升趋势，但从30%增加到35%时，热导率的增幅大于从35%增加到50%时热导率的增幅，前者约为后者的8倍。与NaNO3相比，样品在常温-相变前温度段和相变结束-最高温度段的平均比热容随硅藻土质量分数变化均出现先下降后上升的变化。硅藻土质量分数为35%时，样品内部结构致密，NaNO3充分均匀吸附于硅藻土的分离独立小单元中。硅藻土质量分数为35%时样品具有较好的抗压强度和储热效果。

Abstract

Five NaNO3/diatomite composite phase change materials (CPCM) for thermal energy storage with different mass content of diatomite were prepared using the mixing and sintering method. Diatomite and NaNO3 were employed as carrier material and phase change material respectively. The compressive strength

thermal properties

microscopic morphology

photoelectron spectroscopy and thermal analysis were carried out. The compressive strength of the CPCM was enhanced with the mass fraction of diatomite increasing from 30% to 35% and 40% and showed brittle characteristic. When the mass fraction of diatomite reached 45% and 50%

the NaNO3/diatomite CPCM performed the paddy behavior. The DSC characterization results revealed that diatomite had little effect on the latent heat and phase-change temperature of NaNO3. The obtained results of LFA tests showed that the thermal conductivity of the CPCM decreased with the increase of the temperature. At the given temperature

the thermal conductivity of the NaNO3/diatomite CPCM showed upward trend with the mass fraction of diatomite increases. It was also observed that the enhancing rate of the thermal conductivity was eight times larger when increasing the mass fraction of diatomite increased from 30% to 35% compared with the mass fraction increasing from 35% to 50%. Compared with pure NaNO3

with the diatomite mass fraction increasing from 30% to 50%

the average specific heat capacity of the NaNO3/diatomite CPCM performed the upward and downward trend within the room temperature-phase transition and the end of the phase transition-the highest temperature range. The SEM and EDS results showed that the NaNO3/diatomite CPCM have dense structure with NaNO3 adsorbed uniformly inside the diatomite. The desirable compressive strength and thermal properties of the NaNO3/diatomite CPCM can be achieved by optimizing the mass ratio of diatomite. The NaNO3/diatomite CPCM with 35% (mass) diatomite behaved superior overall performance according to the work in this paper.

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Effects of carrier on characteristics of NaNO3/diatomite composite phase change materials for thermal energy storage

DOI：10.11949/j.issn.0438-1157.20170733

摘要

Abstract

关键词

Keywords

references

Effects of carrier on characteristics of NaNO₃/diatomite composite phase change materials for thermal energy storage