EFFECT OF FILLING DEGREE AND POROSITY OF POROUS MEDIA ON HEAT STORAGE CHAMBER CHARACTERISTICS

Jiang Jingzhi; Yang Qi; Zhu Hairong; Cui Haiting; Song Qingsong

doi:10.19912/j.0254-0096.tynxb.2023-1576

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 106-115. DOI: 10.19912/j.0254-0096.tynxb.2023-1576

EFFECT OF FILLING DEGREE AND POROSITY OF POROUS MEDIA ON HEAT STORAGE CHAMBER CHARACTERISTICS

Jiang Jingzhi, Yang Qi, Zhu Hairong, Cui Haiting, Song Qingsong

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Abstract

Taking the porous medium copper foam composite paraffin phase change material as the research object, using the solidification/melting model in ANSYS-Fluent, the density of the phase change material is based on the Boussinesq hypothesis, and the non-equilibrium model is selected in the porous medium area. The heat storage process of the composite phase change material in the three-dimensional rectangular heat storage cavity is numerically simulated, and the effects of the filling degree and porosity of the porous medium on the phase change heat storage characteristics are analyzed.The results show that when the porosity is constant, the higher the filling degree of the porous medium, the larger the liquid phase rate in the heat storage chamber, the faster the heat storage rate, the faster the temperature transfer in the porous medium area, but the smaller the Nu. At the same time, with the increase of the filling degree of the porous medium, the heat storage capacity gradually decreases. When the filling degree is constant, in the early stage of heat storage, the smaller the porosity, the higher the liquid phase rate in the heat storage chamber, the faster the temperature transfer, the greater the heat storage, the faster the heat storage rate, and the smaller the Nu. in the middle and late stages of heat storage, the smaller the porosity, the smaller the liquid phase rate in the

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phase change / porous medium / numerical simulation / degree of filling / porosity

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Jiang Jingzhi, Yang Qi, Zhu Hairong, Cui Haiting, Song Qingsong. EFFECT OF FILLING DEGREE AND POROSITY OF POROUS MEDIA ON HEAT STORAGE CHAMBER CHARACTERISTICS[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 106-115 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1576

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