Three-dimensional numerical study of discharging characteristics of a fin-enhanced cascaded latent heat storage system

doi:10.19799/j.cnki.2095-4239.2022.0248

Abstract

Abstract:

Cascaded latent heat storage technology has been proven as an effective method for solving the poor thermal conductivity of phase change materials (PCMs). Previous numerical studies on cascaded latent heat storage systems were based on one-or two-dimensional mathematical models, and most of them focused on the charging process. In this paper, a fin-enhanced three-tube cascaded latent heat storage system is proposed, and a three-dimensional numerical model is established to study the thermal performance of PCMs at each stage of the discharging process and to explore the effect of the inlet velocity of the heat transfer fluid and initial temperature of PCMs on system thermal performance. The results show that during the discharging process, the phase change of PCMs at each stage do not occur simultaneously, and the PCMs are mainly affected by the phase change temperature and latent heat. The increase of the inlet velocity of the heat transfer fluid increases the discharging rate of the PCMs. With a further increase of the inlet velocity, the enhancement effect of the discharging rate is weakened. The initial temperature of the PCMs has a certain influence on the sensible heat discharging process but limitedly affects the latent heat discharging stage.

Key words: cascaded latent heat storage, fins, heat storage unit, numerical simulation

CLC Number:

TK 11

Yongliang SHEN, Pengwei ZHANG, Shuli LIU. Three-dimensional numerical study of discharging characteristics of a fin-enhanced cascaded latent heat storage system[J]. Energy Storage Science and Technology, 2022, 11(11): 3558-3565.

Figures/Tables 9

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Table 1

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几何参数	数值/mm
相变换热系统储热器总高度	1200
PCM腔体高度	900
PCM填充高度	810
密封盖高度	100
外管内径	200
中管内径	140
内管内径	60
直型肋片厚度×长度×高度	2×30×900

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