基于修正显热容法对相变储热系统蓄热行为的仿真分析

doi:10.19799/j.cnki.2095-4239.2024.0593

储能科学与技术 ›› 2024, Vol. 13 ›› Issue (11): 3939-3948.doi: 10.19799/j.cnki.2095-4239.2024.0593

基于修正显热容法对相变储热系统蓄热行为的仿真分析

李龙¹(), 杨玺庆², 陶玲³

^1.重庆化工职业学院智能制造与汽车学院，重庆 401220
^2.兰州石化职业技术大学机械工程学院，甘肃兰州 730060
^3.重庆化工职业学院大数据与自动化学院，重庆 401220

收稿日期:2024-06-05 修回日期:2024-07-24 出版日期:2024-11-28 发布日期:2024-11-27
通讯作者: 李龙 E-mail:f5bacon@163.com
作者简介:李龙（1988—），男，硕士，讲师，研究方向为能源与动力设备、多相流，E-mail：f5bacon@163.com；
基金资助:
重庆市教育委员会科学技术研究计划青年项目资助项目(KJQN202304514)

Simulation analysis of heat storage behavior of phase change thermal storage system based on modified sensible heat capacity method

Long LI¹(), Xiqing YANG², Ling TAO³

^1.School of Intelligent Manufacturing and Automotive, Chongqing Chemical Industry Vocational College, Chongqing 401220, China
^2.School of Mechanical Engineering, Lanzhou Petrochemical University of Vocational Technology, Lanzhou 730060, Gansu, China
^3.School of Data and Automation, Chongqing Chemical Industry Vocational College, Chongqing 401220, China

Received:2024-06-05 Revised:2024-07-24 Online:2024-11-28 Published:2024-11-27
Contact: Long LI E-mail:f5bacon@163.com

摘要/Abstract

摘要：

相变换热储能技术因其储热密度大、温度稳定等优点被作为调节能源供需强度、提高能源利用率的主要技术手段。本文以石蜡作为相变材料，以脲醛树脂作为囊壁材料设计了三种不同直径相变胶囊等距布置的板囊结合的相变蓄热单元物理模型。为考虑相变材料物性参数变化的影响，采用函数近似对显热容法进行修正，对相变储热系统在内部自然对流和换热流体流动双重影响下的相变蓄热过程进行了模拟计算，在此基础上分析了相变胶囊直径对储热系统蓄热过程的影响，讨论了相变胶囊内液相率、平均温度、储热系统热通量随时间的变化规律。结果表明：相变胶囊直径是储热系统蓄热性能的关键影响因素，相变胶囊内自然对流作用对储热系统蓄热过程的促进效应随着胶囊直径的增加而提升，储热系统的相变时间和蓄热时间均随相变胶囊直径的增加而延长；熔化过程中，直径较大的相变胶囊具有更高的有效导热系数并随熔化时间逐渐降低至定值，相变材料热通量随时间波动变化后降低至定值。

关键词: 修正显热容法, 相变储热, 数值模拟

Abstract:

Phase conversion thermal energy storage technology serves as a primary technical approach to regulate energy supply and demand while enhancing energy utilization due to its high heat storage density and stable temperature. This study presents a physical model of a combined phase change thermal storage unit, consisting of plate-capsule arrangements with three different diameters of phase change capsules equidistantly spaced, using paraffin as the phase change material and urea-formaldehyde resin as the capsule wall material. To account for the variation in physical parameters of the phase change material during the phase change process, the apparent heat capacity method is modified using a functional approximation. The simulation calculates the phase change thermal storage system considering the effects of internal natural convection and heat transfer fluid flow. The analysis focuses on the impact of capsule diameter on the heat storage process, examining variables such as the liquid phase rate within the capsules, average temperature, and heat flux variation over time. The findings indicate that the diameter of the phase change capsules significantly influences the thermal storage performance of the system. The enhancement of natural convection within the capsules increases with larger diameters, leading to extended phase change and heat storage durations. Capsules with larger diameters exhibit higher effective thermal conductivity during the melting phase, which gradually stabilizes to a constant value. In addition, the PCM (phase change material) heat flux initially fluctuates with time before settling to a constant value.

Key words: modified sensible heat capacity method, phase change thermal storage, numerical simulation

中图分类号:

TK 02

李龙, 杨玺庆, 陶玲. 基于修正显热容法对相变储热系统蓄热行为的仿真分析[J]. 储能科学与技术, 2024, 13(11): 3939-3948.

Long LI, Xiqing YANG, Ling TAO. Simulation analysis of heat storage behavior of phase change thermal storage system based on modified sensible heat capacity method[J]. Energy Storage Science and Technology, 2024, 13(11): 3939-3948.

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物性参数	PCM	脲醛树脂	HTF
密度ρ/(kg/m)	916(s)/776(l)	1420	978
比热容C_p /[J/(kg·K)]	1700(s)/2500 (l)	1672	4190
导热系数λ/[W/(m·K)]	0.27(s)/0.11(l)	0.56	0.66
相变潜热L/(kJ/kg)	141.91
动力黏度μ/(Pa·s)	1.798×10^-3		0.006
熔化温度T_m /K	319.15
膨胀系数β/K^-1	0.0011

t=25 s
t=55 s
t=85 s
	(a) 无自然对流	(b) 自然对流

d=4 mm
d=6 mm
d=8 mm
	(a) t=10 s	(b) t=20 s	(c) t=30 s

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基于修正显热容法对相变储热系统蓄热行为的仿真分析

Simulation analysis of heat storage behavior of phase change thermal storage system based on modified sensible heat capacity method

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