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

doi:10.19799/j.cnki.2095-4239.2024.0593

Abstract

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

CLC Number:

TK 02

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.

Figures/Tables 10

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Table 1

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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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