Author(s)

Wang Xianglei ¹, Shi Yanfang ², Wang Kun ¹, Li Bin ¹, Li Yu ¹, Zhu Xiaomei ¹, Wang Yunfei ¹

Affiliation(s)

¹ Department of Chemical Engineering, Ordos Institute of Technology, Ordos, China
² Yijinhuoluo Campus of Ordos No.1 High School, Ordos, China

Corresponding Author

Wang Xianglei

ABSTRACT

Thermal energy storage (TES) units are used to accumulate thermal energy from solar, geothermal, or waste heat sources. The thermal capacity of these tanks can be further increased by including latent heat, which gives rise to latent heat storage (LHS) units. Typically, LHS tanks contain spherical capsules filled with paraffin as phase change material. This study deals with the numerical evaluation of thermal performance of a packed bed latent heat TES unit integrated with solar flat plate collector. The apparent heat capacity formulation provides an implicit capturing of the phase change interface, by solving for both phases a single heat transfer equation with effective material properties. Local thermal nonequilibrium approach is considered in packed LHS units. The nonisothermal flow multiphysics feature is added to model containing a free and porous media flow and heat transfer in porous media. Paraffin solid wax phase fraction and temperature evolutions are studied. This paper reveals influence of inlet velocity, solar collector power, melting temperature interval, latent heat of fusion, thermal conductivity amplification factor. The time required for heat storage completion is negatively correlated with inlet velocity, solar collector power and thermal conductivity amplification factor. The time required for heat storage completion is positively correlated with latent heat of fusion. The time required for heat storage completion is independent of melting temperature interval.

KEYWORDS

Packed bed latent heat storage, local thermal nonequilibrium, nonisothermal flow multiphysics, heat storage time, porous media

CITE THIS PAPER

Wang Xianglei, Shi Yanfang, Wang Kun, Li Bin, Li Yu, Zhu Xiaomei, Wang Yunfei, Numerical Study on Performance of Packed Bed Latent Heat Storage Integrated with Solar Water Heating System. Frontiers in Power and Energy Systems (2024) Vol. 3: 109-117. DOI: http://dx.doi.org/10.23977/fpes.2024.030114.

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