Usage of Phase Change Material as Heat Storage in Water Desalination
Leony Serenauli Pandjaitan1, Muhamad Dwi Septiyanto1, Syamsul Hadi1*
1 Department of Mechanical Engineering, Sebelas Maret University, Surakarta, Indonesia
*Corresponding Author’s email address: syamsulhadi@staff.uns.ac.id
Abstract
Phase Change Material (PCM) refers to substances that can absorb or release heat,
making them effective for heat storage applications. PCMs can be categorized based on their chemical composition into three primary types: organic, inorganic, and eutectic. In Indonesia, a nation characterized by extended periods of sun exposure, selecting the most suitable PCM for solar still desalination experiments poses a challenge to reduce inefficient practical implications. This study investigates the properties of various PCMs and analyzes the essential factors to consider when choosing a PCM for heat storage. The research employs a review method that utilizes previously published and selected literature from the Scopus database, which incorporates PCM in solar still desalination. The results highlight five critical parameters for evaluation: physical properties, chemical properties, thermal properties, kinetic properties, and economic cost. For optimal compatibility with tropical environments, paraffin wax and soybean wax are identified as the most appropriate choices, whereas coconut oil and beef tallow, which exhibit faster melting rates than wax varieties, are better suited for subtropical regions.
Keywords: Phase change material, Solar still, Energy, Heat storage
CFD Simulation Study on Airflow Dynamics Around a Cricket Ball: Effects of Velocity and Surface Modifications on Aerodynamic Performance
Catur Harsito1, Raihan Danu Ramanda2, Putra Adil Wicaksana2, Yuki Trisnoaji2, Singgih Dwi Prasetyo2*
1 Department of Mechanical, Computer, Industrial, and Management Engineering, Kangwon National University, Samcheok, South Korea
2 Power Plant Engineering Technology, Faculty of Vocational Studies, State University of Malang, Malang, Indonesia
*Corresponding Author’s email address: singgih.prasetyo.fv@um.ac.id
Abstract
This study investigates the aerodynamic behavior of a cricket ball at various velocities using Computational Fluid Dynamics (CFD) in ANSYS Fluent, with a focus on the effects of speed and surface modification on aerodynamic forces and pressure distribution. The cricket ball geometry was simplified by replacing the seam with a protruding flat surface. Simulations were performed at airflow velocities of 20, 30, and 40 m/s using the realizable k-ε turbulence model, with air properties set to a density of 1.225 kg/m³ and dynamic viscosity of 1.81×10-⁵ Pa-s. At 20 m/s, the inlet and outlet mass flow rates were 50.306891 kg/s and -50.306901 kg/s, with a net imbalance of -9.3×10-⁶ kg/s, generating a drag force of 0.5 N, a lift force of 0.2 N, and a pressure difference of 50 Pa. At 30 m/s, the inlet and outlet rates were 75.460373 kg/s and -75.464958 kg/s, respectively, resulting in a net imbalance of -0.004585 kg/s. The flow was fully turbulent, producing a drag force of 3.5 N, a lift force of 1.5 N, and a pressure difference of 250 Pa. Increasing velocity boosts drag, lift, and pressure differences. At the same time, the flat surface enhances asymmetry, vortices, and swing at higher speeds.
Keywords: Cricket ball, CFD simulation, ANSYS Fluent, Aerodynamic forces, External airflow
