Dynamic heat release characteristics of a helical coil-type supercooled phase change thermal storage unit

NONG Xinlu; YUAN Binbin; LI Minhua; ZHANG Fengshuo; LIAO Zhirong; LUO Yimo; WANG Gang; XU Chao

doi:10.19799/j.cnki.2095-4239.2026.0106

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Dynamic heat release characteristics of a helical coil-type supercooled phase change thermal storage unit

Special Issue on Multi\-Scenario Applications of Thermal and Cold Energy Storage | 更新时间：2026-07-01

- Dynamic heat release characteristics of a helical coil-type supercooled phase change thermal storage unit
- Energy Storage Science and Technology Vol. 15, Issue 3, Pages: 906-919(2026)
- 作者机构：
  
  1.华北电力大学新型储能技术北京实验室，北京 102206
  2.湖南大学土木工程学院，湖南长沙 410082
  3.新疆工程学院能源工程学院，新疆乌鲁木齐 830023
- 作者简介：
- 基金信息：
- DOI：10.19799/j.cnki.2095-4239.2026.0106
  CLC： TK 02
- Received：31 January 2026，
  
  Revised：2026-02-10，
  
  Published：28 March 2026
- 稿件说明：
移动端阅览
农欣露, 袁彬斌, 李闽华, 等. 螺旋盘管式过冷相变储热器动态释热特性研究[J]. 储能科学与技术, 2026, 15(3): 906-919.

NONG Xinlu, YUAN Binbin, LI Minhua, et al. Dynamic heat release characteristics of a helical coil-type supercooled phase change thermal storage unit[J]. Energy Storage Science and Technology, 2026, 15(3): 906-919.
农欣露, 袁彬斌, 李闽华, 等. 螺旋盘管式过冷相变储热器动态释热特性研究[J]. 储能科学与技术, 2026, 15(3): 906-919. DOI： 10.19799/j.cnki.2095-4239.2026.0106.

NONG Xinlu, YUAN Binbin, LI Minhua, et al. Dynamic heat release characteristics of a helical coil-type supercooled phase change thermal storage unit[J]. Energy Storage Science and Technology, 2026, 15(3): 906-919. DOI： 10.19799/j.cnki.2095-4239.2026.0106.

摘要

利用相变材料的过冷特性实现热能长时稳定存储，是克服跨季节储热中传统潜热储存热损失显著这一瓶颈问题的有效技术途径。目前，关于螺旋盘管式过冷相变储热器非稳态释热特性的系统研究较少，特别是过冷结晶触发后的再辉效应与潜热释放响应机制亟待深入揭示。为此，本研究以螺旋盘管式储热器为对象，构建了耦合结晶动力学准则的非稳态数值模型，并通过编写用户自定义函数实现了对过冷相变再辉过程的准确描述。在实验验证的基础上，系统研究了释热过程中内部温度场、液相率及释热功率的变化规律，并进一步探索了材料热导率及传热流体入口流速对动态释热特性的影响机制。研究结果表明，螺旋盘管式过冷相变储热器的释热过程呈现出显著的阶段性演化特征，可依次划分为液相显热降温、再辉诱发的潜热释放和固相显热冷却3个阶段。再辉效应诱导的温度回升使液相率瞬间降至0.82，潜热主导阶段具有良好长效性。提升材料热导率可加快凝固进程，当热导率提升至1.2 W/(m·K)时，再辉阶段出口温度和释热功率峰值分别提升17.8%和35.7%。入口流速对释热功率与传热流体出口温度的影响呈现出相反趋势：高流速增强了释热功率，但过冷触发时间与温度平台期时长分别缩短26.9%和30%。

Abstract

Harnessing the supercooling behavior of phase change materials to achieve long-term stable thermal energy storage represents an effective approach to overcoming the significant heat loss inherent in conventional latent heat storage during seasonal thermal energy storage (TES). At present

systematic investigations into the dynamic heat release characteristics of helical coil-type supercooled phase change thermal storage units remain scarce

particularly concerning the recalescence effect and the latent heat release response mechanisms triggered by supercooled crystallization. To address this gap

this study investigates a helical coil-type thermal storage unit by establishing a dynamic numerical model coupled with crystallization kinetics criteria. It accurately simulates the supercooled phase change recalescence process through User-Defined Functions. Based on experimental validation

this study systematically examines the evolution of the internal temperature field

liquid fraction

and heat release power during the heat release process. Furthermore

it explores the influence mechanisms of phase change material thermal conductivity and heat transfer fluid inlet velocity on the dynamic heat release characteristics. The results demonstrate that the heat release process of the helical coil-type supercooled phase change thermal storage unit exhibits pronounced stage-wise evolution

which can be divided into three successive stages: liquid sensible heat cooling

recalescence-induced latent heat release

and solid sensible heat cooling. The temperature rise induced by recalescence instantaneously reduces the liquid fraction to 0.82

and the latent heat-dominated stage exhibits favorable long-duration performance. Increasing the material's thermal conductivity accelerates the solidification process. When the thermal conductivity reaches 1.2 W/(m·K)

the peak outlet temperature and peak heat release power during recalescence increase by 17.8% and 35.7%

respectively. The inlet flow velocity produces contrasting effects on heat release power and outlet temperature: higher velocities enhance heat release power but shorten the supercooling trigger time and the duration of the temperature plateau by 26.9% and 30%

respectively.

关键词

Keywords

references

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