A simulation analysis on the effect of encapsulation mode on the heat storage and release performance of phase change water tank

doi:10.19799/j.cnki.2095-4239.2021.0682

Abstract

Abstract:

This paper was written under the premise of ensuring the same water tank structure size, phase change material type and dosage, and water temperature and flow rate at the tank's inlet to investigate the impact of different shape encapsulation units on the heat storage and release performance of phase change energy storage tanks. Fluent software is applied to simulate the phase change energy storage tank with plate type, cylinder type, spherical type encapsulation unit, and the traditional water tank without phase change material. The research next examines the variations in each water tank's heat storage duration, heat release time, temperature distribution, and heat storage and release capacity. The simulation results show that the shape change of the encapsulation unit will have some influence on the heat storage and release performance of the water tank. The spherical unit water tank is the first to complete heat storage and release during the heat storage and release process. The heat storage and release times are both reduced by 10% and 2.3%, respectively, when compared with the plate and cylinder unit water tanks. It takes the longest time for the plate unit water tank to complete heat storage and release, compared with the traditional water tank, the heat storage time is extended by 54.8% and the heat release time is extended by 38.7%. The cylindrical unit water tank has the highest heat storage capacity, at 41.612 MJ, which is 16.1% more than a typical water tank. Plate unit water tank releases the most heat, the heat release capacity is 41.634 MJ, compared with the traditional water tank increased by 16.2%. The temperature distribution in the spherical unit water tank shows a trend of increasing or decreasing along the height direction, which is quite different from the other two-phase change energy storage tanks, and there is an inadequate heat transfer zone due to the different shape and arrangement of encapsulation units.

Key words: phase change storage tank, encapsulation unit shape, heat storage and release time, heat storage and release capacity, numerical simulation

CLC Number:

TK 02

Guohui FENG, Tianyu WANG, Gang WANG. A simulation analysis on the effect of encapsulation mode on the heat storage and release performance of phase change water tank[J]. Energy Storage Science and Technology, 2022, 11(7): 2161-2176.

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参数	数据
密度/(kg/m³)	978
比热容/[kJ/(kg·K)]	3.22(固态)、3.15(液态)
导热系数/[W/(kg·K)]	0.49(固态)、0.28(液态)
动力黏度/[kg/(m·s)]	0.011
相变潜热/(kJ/kg)	200
相变温度/K	323(熔化)、325(凝固)

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