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All Journal Jurnal Teknik Mesin Journal of Power, Energy, and Control
Alief Avicenna Luthfie, Alief Avicenna
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Journal : Journal of Power, Energy, and Control

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Melting Process Investigation of KCl Salt as a PCM by Enthalpy-Porosity Simulation Model with Temperature-dependent Physical Properties Hasan, Muhammad Miqdad; Luthfie, Alief Avicenna
Journal of Power, Energy, and Control Vol. 1 No. 2 (2024)
Publisher : MSD Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62777/pec.v1i2.22

Abstract

Salt as a phase change material (PCM) in thermal energy storage (TES) can store solar thermal energy in the form of latent heat by experiencing a process known as the melting process. Recently, the melting process can be observed and investigated using an enthalpy-porosity simulation model. However, the use of enthalpy-porosity simulation model is still focused on constant physical properties, i.e., density and viscosity, of the PCM, and thus, the changes in the physical properties with respect to temperature during the melting process are not included in the simulation process. Therefore, this study aims to use the enthalpy-porosity simulation model with temperature-dependent physical properties of the PCM to investigate the melting process. The salt in this study is Potassium Chloride (KCl), and the computational domain is a concentric tube based on the assumption that the salt is fully contained within the computational domain. The physical properties of the KCl salt (density and viscosity) are set as functions of temperature to include the changes in the physical properties with respect to temperature during the melting process. The simulation results show that the melting process period is 450 s. In addition, the tendency of the melting rate, which is defined as the change in liquid fraction per unit time, is observed to decrease during the melting process. Compared with the constant physical properties of the KCl salt, the melting period of the KCl salt with temperature-dependent physical properties is observed to be shorter, with a deviation of 28.57%.
Solidification Process Investigation of LiCl Salt as PCM with Temperature-Dependent Density and Viscosity by Enthalpy Porosity Simulation Model Ibrahim, Nur Syah; Luthfie, Alief Avicenna
Journal of Power, Energy, and Control Vol. 2 No. 1 (2025)
Publisher : MSD Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62777/pec.v2i1.42

Abstract

An enthalpy porosity simulation model is widely used to simulate the solidification process of a Phase Change Material (PCM) with constant density and viscosity. Consequently, numerical inaccuracy may arise in the investigation of the solidification process. Therefore, this study investigates the solidification of lithium chloride (LiCl) as a PCM, incorporating temperature-dependent density and viscosity in the enthalpy porosity model. Furthermore, the computational domain is represented by a concentric pipe, with the LiCl salt assumed to be fully filled within the annulus. The boundary conditions are adiabatic on the outer radius and constant temperature on the inner radius, representing the temperature of the Heat Transfer Fluid (HTF). The simulation results show that the solidification process with temperature-dependent density and viscosity required a total time of 2360 s to complete the solidification process. In addition, the solidification rate is decreased at the beginning of the solidification process and then increased before being decreased at the end of the solidification process. Furthermore, a comparison is conducted with constant density and viscosity. The comparison result shows that the solidification time of temperature-dependent density and viscosity is shorter than the solidification process time of constant density and viscosity with a deviation of 8.5%, indicating the importance of using the temperature-dependent density and viscosity to investigate the solidification time. Conversely, the solidification rate shows a similar tendency, indicating the insignificant effect of using the temperature-dependent density and viscosity to investigate the solidification rate.
Co-Authors Abdul Hamid Agung Wahyudi Biantoro Desti Dorion, L. B. Fahmi Hidayat Ghufron, Hanif Hasan, Muhammad Miqdad Ibrahim, Nur Syah Murtyas, Solli Dwi Parwitasari, Fadella Binda Raynaldi, Ray Romahadi, Dedik Sayekti, Mega Esti Suci Setyoko, Premadi