基于圆台波浪形换热管的潜热储热单元性能分析

doi:10.16085/j.issn.1000-6613.2023-0394

摘要/Abstract

摘要：

为提高潜热储热单元（latent heat storage unit，LHSU）的储热性能，提出了三种优化换热管结构的新型LHSU，分别为圆台形换热管潜热储热单元、波浪形换热管潜热储热单元和圆台波浪形换热管潜热储热单元（frustum wavy heat transfer tube latent heat storage unit, FW-LHSU）。基于数值模拟方法，比较了传统圆柱形换热管潜热储热单元（cylindrical heat transfer tube latent heat storage unit, C-LHSU）和三种新型LHSU的储热性能。此外，针对FW-LHSU研究了换热管壁面倾斜角度对储热性能的影响。结果发现，所提出的三种新型换热管结构均能增强储热性能，其中FW-LHSU储热效果最好，与C-LHSU相比，FW-LHSU的熔化时间缩短了32.64%，储热速率密度提高了48.1%。当增加FW-LHSU的换热管壁面倾斜角度时，其储热性能可进一步提高。当换热管倾斜角度从2°增加到8°时，FW-LHSU的储热时间可缩短37.00%、储热速率密度可提高48.44%。

关键词: 圆台波浪形换热管, 相变材料, 潜热存储单元, 熔化时间, 储热速率密度

Abstract:

In order to improve the heat storage performance of latent heat storage unit (LHSU), three novel heat transfer tubes of the LHSUs were proposed, including frustum, wavy, and frustum wavy heat transfer tube LHSUs. Based on the numerical simulation, the heat storage performance of the cylindrical heat transfer tube latent heat storage unit (C-LHSU) and the above three novel LHSUs were compared. In addition, the influence of the tilt angle of the heat transfer tube on heat storage performance was studied for the LHSU with the frustum wavy tube (FW-LHSU). The results showed that the three novel tube structures could enhance heat storage performance, and the FW-LHSU had the optimal heat storage performance. Compared with C-LHSU, FW-LHSU had a 32.64% reduction in melting time and a 48.1% enhancement in heat storage density. The heat storage performance of FW-LHSU could be further improved by increasing the tilt angle of the heat transfer tube. When the tilt angle of the heat transfer tube increased from 2° to 8°, the heat storage time of FW-LHSU decreased by 37.00%, and the heat storage density increased by 48.44%, respectively.

Key words: frustum wavy heat transfer tube, phase change material, latent heat storage unit, melting time, heat storage density

中图分类号:

TK512⁺.4

丁丽华, 徐洪涛, 张晨宇. 基于圆台波浪形换热管的潜热储热单元性能分析[J]. 化工进展, 2024, 43(3): 1214-1223.

DING Lihua, XU Hongtao, ZHANG Chenyu. Analysis of the heat storage performance of the latent heat storage unit combined with frustum wavy tube[J]. Chemical Industry and Engineering Progress, 2024, 43(3): 1214-1223.

图/表 11

图1 带有不同形状换热管的LHSU几何结构示意图

表1 PCM、水和铜管的热物性参数[17]

项目	密度/kg·m^-3	比热/J·kg^-1·K^-1	导热系数/w·m^-1·K^-1	熔化潜热/J·kg^-1	黏度/kg·m^-1·s^-1	热膨胀系数/K^-1	凝固/熔化温度/℃
RT 35	815	2000	0.2	160000	0.023	0.0006	29/32
铜管	8960	385	400	—	—	—	—
水	998.2	4182	0.60	—	0.001003	—	—

表2 所有模型具体尺寸

案例	L₀/mm	r/mm	r₀/mm	r₁/mm	r₂/mm	θ/(°)	有无波浪
C-LHSU	300	61	30	—	—	—	无
F-LSHU	300	61	—	25.61	36.05	2	无
W-LHAU	300	61	30	—	—	—	有
FW-LHSU-2°	300	61	—	25.61	36.05	2	有
FW-LHSU-4°	300	61	—	18.62	39.89	4	有
FW-LHSU-6°	300	61	—	12.81	44.40	6	有
FW-LHSU-8°	300	61	—	6.43	48.59	8	有

图2 LHTES 单元计算区域

图3 无关性验证和数值模型验证

图4 不同形状换热管LHSU中PCM液化率及温度分布云图

图5 不同形状换热管LHSU中PCM的液化率、速度变化

图6 不同形状换热管LHSU储热速率密度

图7 不同换热管壁面倾斜角度下FW-LHSU中PCM温度及液化率分布

图8 不同换热管壁面倾斜角度下FW-LHSU中PCM的液化率和速度变化

图9 不同换热管壁面倾斜角度下FW-LHSU储热速率密度

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