Numerical study of stable phase change materials based on polymers and renewable resources for thermal energy storage

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dc.contributor.authorABDELLATIF , Houssam Eddine
dc.contributor.authorBELAADI , Ahmed
dc.date.accessioned2025-10-23T09:25:01Z
dc.date.available2025-10-23T09:25:01Z
dc.date.issued2025
dc.description.abstractThis thesis presents a comprehensive study on advanced thermal energy storage (TES) technologies, focusing on Phase Change Materials (PCMs) and their integration into hybrid systems that combine both sensible and latent heat storage, as well as pure latent heat storage systems. The research begins with an extensive exploration of methods to enhance PCM performance, including the use of fins, nanoparticles, porous matrices, multiple PCMs, encapsulation, and shape stabilization. To evaluate and optimize these enhancements, advanced simulation techniques are employed. These techniques are categorized into Numerical Methods such as Finite Difference, Finite Volume, Finite Element, and Lattice Boltzmann method and Thermal Modeling Techniques, including the Enthalpy Method, Enthalpy-Porosity Method, Heat Capacity Method, and Molecular Dynamics. Together, they provide comprehensive insights into PCM behavior and system performance. It is important to note that the numerical investigations presented in this thesis are based on experimental studies previously reported by other authors, which serve as a reference for validation and model development. The thesis also investigates hybrid TES systems by analyzing the impact of varying the length-todiameter (L/D) ratio on thermal stratification in TES tanks and the melting process of PCM, utilizing computational fluid dynamics (CFD) to evaluate system efficiency. Additionally, it explores the influence of baffle designs, particularly those with varying hole diameters, on the thermal performance of PCM-based TES tanks. Furthermore, the thesis examines how different inner tube geometries, including novel horizontal oval, inclined oval (45°), vertical oval shapes, wedge shapes, and the addition of fins, affect the melting and solidification processes within PCM units, contributing to enhanced heat transfer and energy storage efficiency. This thesis demonstrated that enhancing design parameters significantly enhances PCM-based TES systems. Optimal L/D ratios improved stratification and heat transfer; baffles reduced melting time by 21.67% and enhanced economic performance; vertical oval tubes shortened solidification by ~19%; and advanced multi-wedge, parallel shell, and finned designs decreased melting time by 56.75% while boosting storage capacity and cost efficiency
dc.identifier.urihttp://dspace.univ-skikda.dz:4000/handle/123456789/5257
dc.language.isoen
dc.publisheruniversity 20 august 1955 skikDa
dc.subjectThermal energy storage,
dc.subjectPhase Change Materials, Hybrid energy systems,
dc.titleNumerical study of stable phase change materials based on polymers and renewable resources for thermal energy storage
dc.typeThesis
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