双翅片矩形相变储能单元蓄热性能实验研究

doi:10.19799/j.cnki.2095-4239.2023.0627

储能科学与技术 ›› 2024, Vol. 13 ›› Issue (2): 405-415.doi: 10.19799/j.cnki.2095-4239.2023.0627

双翅片矩形相变储能单元蓄热性能实验研究

罗意彬¹(), 段文超¹, 严景好¹, 李杰¹(), 孙小琴¹(), 廖曙光²

^1.长沙理工大学能源与动力工程学院，湖南长沙 410114
^2.长沙麦融高科股份有限公司，湖南长沙 410000

收稿日期:2023-09-13 修回日期:2023-09-29 出版日期:2024-02-28 发布日期:2024-03-01
通讯作者: 李杰,孙小琴 E-mail:yibinluo1206@163.com;lijie@csust.edu.cn;xiaoqinsun@csust.edu.com
作者简介:罗意彬（1999—），女，硕士研究生，主要研究方向为相变材料传热性能强化，E-mail：yibinluo1206@163.com；
基金资助:
国家级纳米复合型固液相变材料热调控机理及传热特性研究(52078053);湖南省湖水源空调系统关键技术研究及其在低碳建筑中的应用示范(2022sfq27);湖南省科技创新领军人才(2023RC1057)

Experimental study on heat storage performance of a double-fin rectangular phase change energy storage unit

Yibin LUO¹(), Wenchao DUAN¹, Jinghao YAN¹, Jie LI¹(), Xiaoqin SUN¹(), Shuguang LIAO²

^1.School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China
^2.Changsha Maxxom Technology Co. , Ltd, Changsha 410000, Hunan, China

Received:2023-09-13 Revised:2023-09-29 Online:2024-02-28 Published:2024-03-01
Contact: Jie LI, Xiaoqin SUN E-mail:yibinluo1206@163.com;lijie@csust.edu.cn;xiaoqinsun@csust.edu.com

摘要/Abstract

摘要：

以双翅片矩形相变储能单元为研究对象，开展不同边界温度下（50 ℃、55 ℃、64 ℃、69 ℃、73 ℃）相变材料熔化过程的可视化实验，通过观察相变材料固液相变界面、温度和液相率变化分析储能单元内相变材料的熔化行为和传热规律，探究不同边界温度对储能单元蓄热性能的影响。研究表明：熔化后期储能单元内出现的熔化死角极大延长了蓄热时间，熔化死角用时比均大于30%；边界温度增加，固液相界面形状无明显变化，相变材料内温度分布及变化趋势相似，但固液相界面演化进程加快，自然对流加强，相变材料内温度分布不均匀性最大增加60%，相变温度最大增加2.9 ℃；边界温度从50 ℃提高至73 ℃时，完全熔化时间缩短510 min，且边界温度越低时 $F o S t e$ 越大，表明在边界温度较低时，增加边界温度对相变材料的强化传热效果更明显。

关键词: 双翅片, 矩形相变储能单元, 边界温度, 熔化过程, 自然对流

Abstract:

This study aims to investigate the influence of different boundary temperatures on the heat storage performance of the phase change energy storage unit (PCESU) by conducting visual experiments on the melting process of phase change material (PCM) in a double-fin rectangular PCESU at different boundary temperatures. The analysis involves examining the melting behavior and heat transfer process based on the observation of the solid–liquid interface, PCM temperature, and liquid fraction. The results show that during the late melting stage, solid PCM accumulated at the right-bottom of the PCESU, extending the heat storage time, with the melting time ratio of the PCM at this stage exceeding 30%. With the increase of boundary temperature, the shape of the solid-liquid interface remains considerably constant, with temperature distribution variation being similar. However, the evolution process of the solid-liquid interface accelerates, and natural convection is enhanced, leading to a 60% increase in the nonuniformity of the temperature distribution in the PCM. Moreover, the phase transition temperature increases by a maximum of 2.9 ℃. The results demonstrate that when the boundary temperature increases from 50 ℃ to 73 ℃, the complete melting time is shortened by 510 min. Lower the boundary temperature, greater the $F o S t e$ , indicating that increasing the boundary temperature has a pronounced effect on heat transfer enhancement of the PCM at a lower boundary temperature.

Key words: double-fin, rectangular phase change energy storage unit, boundary temperature, melting process, natural convection

中图分类号:

TK 02

罗意彬, 段文超, 严景好, 李杰, 孙小琴, 廖曙光. 双翅片矩形相变储能单元蓄热性能实验研究[J]. 储能科学与技术, 2024, 13(2): 405-415.

Yibin LUO, Wenchao DUAN, Jinghao YAN, Jie LI, Xiaoqin SUN, Shuguang LIAO. Experimental study on heat storage performance of a double-fin rectangular phase change energy storage unit[J]. Energy Storage Science and Technology, 2024, 13(2): 405-415.

图/表 22

图1

图2

表1

实验材料热物性参数表"

(a) 石蜡热物性参数表
热物性	参数
相变温度区间/℃	37~45
密度/(k $/$ m³)	961(s)/893(l)
导热系数/[W/(m $·$ ℃)]	0.31(s)/0.21(l)
比热容/[kJ/(kg $·$ ℃)]	2.12(s)/1.98(l)
相变潜热/(kJ/kg)	220.5
动力黏度/(Pa $·$ s)	0.00787
体积热膨胀系数/℃^-1	0.0008

表1

表2

图3

表3

图4

表4

主要参数的不确定性分析"

实验参数	温度	长度	图像分辨率	液相率	换热量
不确定度	$±$ 1 ℃	$±$ 1mm	$±$ 1.0%	4.2%	7.5%

表4

图5

图6

图7

表5

不同边界温度下的熔化死角用时比?"

参数	M1(T_w=50 ℃)	M2(T_w=55 ℃)	M3(T_w=64 ℃)	M4(T_w=69 ℃)	M5(T_w=73 ℃)
熔化死角完全熔化用时 $t d e a d$	280 min	190 min	130 min	100 min	90 min
石蜡完全熔化用时 $t t o t a l$	720 min	460 min	310 min	250 min	210 min
熔化死角用时比 $ε$	38.89%	39.13%	32.26%	40.00%	42.86%

表5

图8

图9

表6

M5(Tw=73 ℃)中垂面上各行/列之间的温差平均值"

温差平均值	对应测点	M5(T_w=73 ℃)
$T 1 j ¯$ / $T 2 j ¯$	(T11、T12、T13)/(T21、T22、T23)	1.96 ℃
$T 2 j ¯$ / $T 3 j ¯$	(T21、T22、T23)/(T31、T32、T33)	3.23 ℃
$T i 1 ¯$ / $T i 2 ¯$	(T11、T21、T31)/(T12、T22、T32)	1.50 ℃
$T i 2 ¯$ / $T i 3 ¯$	(T12、T22、T32)/(T13、T23、T33)	1.54 ℃

表6

图10

图11

表7

图12

表8

图13

图14

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(a)硅胶加热片主要参数
尺寸/mm×mm	输入电压/V	电阻/Ω	可承受温度范围/℃	测量精度
120 x 120	220	10	-50～250	±1%
(b)温控器主要参数
电源规格	温度探头	控温温度范围/℃	工作环境温度/℃	测量精度
110~240 VAC 50/60 Hz	K型热电偶	-20～300	-10～60	±1%

温差平均值	M1(T_w=73 ℃)	M2(T_w=69 ℃)	M3(T_w=64 ℃)	M4(T_w=55 ℃)	M5(T_w=50 ℃)
T1j/T2j	1.96 ℃	1.68 ℃	1.21 ℃	0.66 ℃	0.28 ℃
T2j/T3j	3.23 ℃	2.60 ℃	2.16 ℃	1.84 ℃	1.17 ℃
Ti1/Ti3	3.04 ℃	3.03 ℃	2.84 ℃	2.46 ℃	1.90 ℃

实验	相变温度
M1(T_w=73 ℃)	44.1~44.7 ℃
M2(T_w=69 ℃)	43.2~44.0 ℃
M3(T_w=64 ℃)	42.9~43.6 ℃
M4(T_w=55 ℃)	41.9~42.8 ℃
M5(T_w=50 ℃)	41.0~42.0 ℃

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双翅片矩形相变储能单元蓄热性能实验研究

Experimental study on heat storage performance of a double-fin rectangular phase change energy storage unit

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温度	M1	M2	M3	M4	M5
设定边界温度T_S/℃	50	55	60	65	70
实际边界温度T_W/℃	50	55	64	69	73