A Study on the Heat Storage Characteristics of Cascade Heat Storage Based on Composite Phase Change Material

Guo Shaozhen; Xiao Guangming; Zhang Nan; Du Yanxia; Wang Xian

doi:10.3969/j.issn.0253-4339.2020.03.140

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A Study on the Heat Storage Characteristics of Cascade Heat Storage Based on Composite Phase Change Material

更新时间：2024-07-18

- A Study on the Heat Storage Characteristics of Cascade Heat Storage Based on Composite Phase Change Material
- Journal of Refrigeration Vol. 41, Issue 3, (2020)
- 作者机构：
  
  1. 西安交通大学航天航空学院机械结构强度与振动国家重点实验室陕西省先进飞行器服役环境与控制重点实验室
  2. 中国空气动力研究与发展中心空气动力学国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2020.03.140
  CLC：
- Published：01 January 2020
- 稿件说明：
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Guo Shaozhen, Xiao Guangming, Zhang Nan, et al. A Study on the Heat Storage Characteristics of Cascade Heat Storage Based on Composite Phase Change Material[J]. Journal of refrigeration, 2020, 41(3).
DOI：

Guo Shaozhen, Xiao Guangming, Zhang Nan, et al. A Study on the Heat Storage Characteristics of Cascade Heat Storage Based on Composite Phase Change Material[J]. Journal of refrigeration, 2020, 41(3). DOI： 10.3969/j.issn.0253-4339.2020.03.140.

摘要

针对潜热蓄热装置内部相变材料（PCM）导热系数偏小，蓄热速率过低的问题，对基于复合相变材料的两级串联式梯级蓄热装置的相变过程进行了数值研究。通过对不同热物性PCM工况的对比与分析，得到了装置在不同工况下的蓄热特性。结果表明，存在最佳的热扩散系数，使固定熔点的PCM实现“均匀等速相变”。同时，增大PCM的热扩散系数可以有效降低加热面温度，但随着热扩散系数的增大，加热面温度降低幅度减小。通过分析Stefan数，得到了装置最佳的参数，使工况蓄热效果最佳。最后，通过Stefan数为2.88时的实验工况验证了相关规律的正确性。

Abstract

The thermal conductivity of phase change materials (PCM) within latent heat storage devices is small and the rate of heat storage is low

which is problematic to the widespread utilization of latent heat storage devices. Consequently

the phase change process of a two-stage series cascade heat storage device based on composite phase change materials was numerically studied. By comparing and analyzing the results of different PCM with different thermal properties

the heat storage characteristics of the device were obtained. The results show that there is an optimal thermal diffusivity

so that the PCM with fixed melting point achieves "a uniform constant-velocity phase change". At the same time

increasing the thermal diffusivity of the PCM can effectively reduce the heating surface temperature

but the decline in heating surface temperature was minimized with a continuous increase in thermal diffusivity. By analyzing the Stefan number

the optimal parameters of the device were obtained. Finally

the correctness of the rule was verified by an experimental study when the Stefan number was 2.88.

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