Parameter analysis and fast prediction of the optimum eccentricity for a latent heat thermal energy storage unit with phase change material enhanced by porous medium
TL;DR: In this article, the melting performance of porous-medium-enhanced phase change material (PCM) in a horizontal shell-and-tube latent-heat thermal energy storage unit (LHTESU) with eccentric structure is studied through a fixed-grid numerical method.
About: This article is published in Applied Thermal Engineering.The article was published on 2021-03-05. It has received 27 citations till now. The article focuses on the topics: Eccentricity (behavior) & Porous medium.
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TL;DR: In this paper, the authors proposed a structure with fins and graded metal foam to further enhance thermal performance, and the porosity of the metal foam increases gradually from the inner tube to the outer shell to reduce thermal resistance and improve thermal conduction globally.
26 citations
TL;DR: In this paper , the integration of phase change materials (PCMs) with thermal energy storage systems has been reviewed and evaluated comprehensively to provide insights into thermal conductivity enhancement techniques.
20 citations
TL;DR: In this paper, the combined full-fins and nanoparticles in gradient-concentration was proposed to overcome the low melting rate of phase change materials (PCMs) due to their low conductivity and local natural convection.
16 citations
TL;DR: In this paper , the authors investigated the effects of different eccentric positions of the inner heat transfer fluid (HTF) tube on the thermal performance of a horizontal shell-and-tube LHTES system during the melting and solidification processes.
16 citations
TL;DR: In this article, the authors suggest that areas above and below inner tube may be the core factor, based on this, "eccentric space ratio" is proposed to explore the thermal behavior of phase change material in different radius ratio models.
16 citations
References
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TL;DR: In this article, the melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change.
Abstract: The melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change. The major advantage of this technique is that it allows a fixed-grid solution of the coupled momentum and energy equations to be undertaken without resorting to variable transformations. In this work, a two-dimensional dynamic model is used and the influence of laminar natural-convection flow on the melting process is considered. Excellent agreement exists between the numerical predictions and experimental results available in the literature. The enthalpy-porosity approach has been found to converge rapidly, and is capable of producing accurate results for both the position and morphology of the melt front at different times with relatively modest computational requirements. These results may be taken to be a sound validation of this technique for modeling isothermal phase changes in metallurgical systems.
1,377 citations
TL;DR: In this article, a review of thermal energy storage system design methodologies and the factors to be considered at different hierarchical levels for concentrating solar power (CSP) plants is presented.
1,031 citations
TL;DR: In this paper, an experimental and numerical study of forced convection in high porosity (e∼0.89-0.97) metal foams was conducted using air as the fluid medium.
Abstract: We report an experimental and numerical study of forced convection in high porosity (e∼0.89-0.97) metal foams. Experiments have been conducted with aluminum metal foams in a variety of porosities and pore densities using air as the fluid medium. Nusselt number data has been obtained as a function of the pore Reynolds number. In the numerical study, a semi-empirical volume-averaged form of the governing equations is used. The velocity profile is obtained by adapting an exact solution to the momentum equation. The energy transport is modeled without invoking the assumption of local thermal equilibrium. Models for the thermal dispersion conductivity, k d , and the interstitial heat transfer coefficient, h sf , are postulated based on physical arguments. The empirical constants in these models are determined by matching the numerical results with the experimental data obtained in this study as well as those in the open literature. Excellent agreement is achieved in the entire range of the parameters studied, indicating that the proposed treatment is sufficient to model forced convection in metal foams for most practical applications
911 citations
TL;DR: In this paper, the effect of metal foams on solid/liquid phase change heat transfer is investigated, and the results show that the use of metal foam can make the sample solidified much faster than pure PCM samples, evidenced by the solidification time being reduced by more than half.
620 citations
TL;DR: In this article, the impregnation ratios which reflect the actual mass fraction of pure paraffin impregnated were studied comparatively for the impregnations with and without vacuum assistance, and the surface porosity was obtained by employing the image processing approach.
459 citations