相变储冷凝胶在管翅式储冷器中传热特性的研究

doi:10.19799/j.cnki.2095-4239.2023.0682

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (12): 3740-3748.doi: 10.19799/j.cnki.2095-4239.2023.0682

相变储冷凝胶在管翅式储冷器中传热特性的研究

谭振炜¹^,²(), 李沐¹^,², 李传常¹^,²()

^1.长沙理工大学能源与动力工程学院
^2.长沙理工大学电网防灾减灾全国重点实验室，湖南长沙 410114

收稿日期:2023-10-07 修回日期:2023-11-16 出版日期:2023-12-05 发布日期:2023-12-09
通讯作者: 李传常 E-mail:zhenweitan2021@163.com;chuanchangli@126.com
作者简介:谭振炜（2000—），男，硕士研究生，研究方向为相变储冷技术及其数值模拟研究，E-mail：zhenweitan2021@163.com；
基金资助:
国家自然科学基金项目(52274252);湖南省重点研发计划(2022GK2048);湖南省湖湘青年英才(2020RC3038);长沙市杰出创新青年培养计划(kq1802007)

Research on the heat transfer characteristics of phase change cold storage gels in tube and fin cold storage equipment

Zhenwei TAN¹^,²(), Mu LI¹^,², Chuanchang LI¹^,²()

^1.School of Energy and Power Engineering, Changsha University of Science and Technology
^2.State Key Laboratory of Disaster Prevention & Reduction for Power Grid, Changsha University of Science & Technology, Changsha 410114, Hunan, China

Received:2023-10-07 Revised:2023-11-16 Online:2023-12-05 Published:2023-12-09
Contact: Chuanchang LI E-mail:zhenweitan2021@163.com;chuanchangli@126.com

摘要/Abstract

摘要：

相变储冷凝胶因其良好的稳定性在冷链运输中具有良好的应用前景，但其高黏度、低流动性的特点抑制了相变过程中的自然对流，影响了储冷器的传热性能，从而降低了冷能利用效率。本工作建立了二维管翅式储冷器的CFD模型，基于FLUENT软件的熔化/凝固模型，研究了相变储冷凝胶的流动性对储冷器传热性能的影响；对比了不同结构储冷器充冷效率，定义了无量纲数e表示结构充冷效率，并探究了不同储冷器结构对充冷过程的影响。结果表明，在-5 ℃冷源充冷下，有自然对流的储冷凝胶相较于无自然对流的储冷凝胶充冷时间缩短12%；在重力场的作用下，不同区域不同时间的储冷凝胶流动性不同，在凝固过程前期以及在储冷器上方的储冷凝胶流速较快且流场范围较大、传热更快；双管结构表现出更高的充冷效率。本研究有助于推动相变储冷器在冷链运输中的应用，并为优化相变储冷器结构提供理论依据。

关键词: 冷链运输, 相变储冷, 自然对流, 数值模拟, 传热分析

Abstract:

Phase change cold storage gels have considerable potential for applications in cold chain transportation owing to their good stability. However, their high viscosity and low fluidity inhibit the natural convection during the phase change process, which affect the heat transfer performance of cold storage equipment, thereby reducing the efficiency of cold energy utilization. Herein, a two-dimensional CFD model for tube-fin-type cold storage equipment was established and the influence of the fluidity of phase change cold storage gel on its heat transfer performance was investigated based on the melting-solidification model of FLUENT software. The study compares the cold charging efficiencies of various structural cold storage equipment, introduces the dimensionless number e to represent structural cold charging efficiency, and explores the effect of various structures of cold storage equipment on the cold charging process. Results reveal that the cooling time for cold storage gel with natural convection is 12% shorter than that without natural convection at -5 ℃. Furthermore, under the effectof gravity field, the mobility of cold storage gel varies across different areas and times. Notably, during the early stage of the solidification process and in the cold storage gel above the cold storage equipment, the flow rate of cold storage gel is faster and flow field range is larger, resulting in faster heat transfer. The double-tube structure exhibits a higher cooling efficiency. This study helps to advance the application of cold storage equipment in cold chain transportation and offers a theoretical basis for optimizing the structure of cold storage equipment.

Key words: cold chain transportation, phase change cold storage, natural convection, numerical simulation, heat transfer analysis

中图分类号:

TK 11

谭振炜, 李沐, 李传常. 相变储冷凝胶在管翅式储冷器中传热特性的研究[J]. 储能科学与技术, 2023, 12(12): 3740-3748.

Zhenwei TAN, Mu LI, Chuanchang LI. Research on the heat transfer characteristics of phase change cold storage gels in tube and fin cold storage equipment[J]. Energy Storage Science and Technology, 2023, 12(12): 3740-3748.

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部件	参数
管道	—
材料	不锈钢
内径	10 mm
厚度	1 mm
水平间距	34 mm
翅片	—
材料	不锈钢
尺寸	34 mm×436 mm
厚度	0.5 mm
翅片数量	48
容器	—
材料	隔热聚乙烯
内部尺寸	1034 mm×398 mm×88 mm
厚度	5 mm

材料	物性	参数值
相变储冷凝胶	相变温度(T_solidus/T_liquidus)/℃	0.8/2.7
	相变潜热/(kJ/kg)	137.7
	显热/[J/(kg·K)]	1340
	导热系数/[W/(m·K)]	0.435
	密度/(g/cm³)	1.47
	黏度/(mPa·s)	82.03
304不锈钢	密度/(g/cm³)	7.85
	显热/[J/(kg·K)]	460
	导热系数/[W/(m·K)]	16

结构	金属质量增加率/%	充冷时间缩短率/%	无量纲e
单管2翅片	1.98	0.44	0.22
单管4翅片	2.97	0.56	0.19
双管0翅片	2.00	0.76	0.38
双管2翅片	2.58	0.83	0.32
双管4翅片	3.16	0.87	0.28

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相变储冷凝胶在管翅式储冷器中传热特性的研究

Research on the heat transfer characteristics of phase change cold storage gels in tube and fin cold storage equipment

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