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All Journal Indonesian Physical Review Makara Journal of Technology
Fachredzy, Amdy
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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ENHANCED THERMAL PERFORMANCE OF POLYETHYLENE GLYCOL-BASED PHASE CHANGE MATERIALS USING ZnO Fachredzy, Amdy; Manalu, Emmy S.; Sihotang, M. Sontang; Juwono, Ariadne L.; Tetuko, Anggito P.; Fauzi, Muhammad; Nabawi, Muhammad A. H.; Sebayang, Achmad Maulana S.; Setiadi, Eko A.
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.485

Abstract

Polyethylene Glycol (PEG), an organic Phase Change Material (PCM) known for its high latent heat capacity and biocompatibility, suffers from poor thermal conductivity. This research explored the addition of ZnO (at 8 and 12 wt.%) as an enhancer and SDBS as a surfactant, utilizing a two-step homogenization process at 80°C for 4 h. X-ray Diffraction (XRD) analysis confirmed that no chemical interactions or new phases occurred. Differential Scanning Calorimetry (DSC) findings revealed an enhancement in PEG's latent heat of PEG from 214 J/g to 238.3 J/g (with 8 wt.% ZnO) and 257.7 J/g (with 12 wt.% ZnO). The thermal conductivity improved by 28.2% and 30.3%, respectively, while Thermogravimetric Analysis (TGA) demonstrated increased thermal stability.  The addition of ZnO can improve the conductivity and thermal stability, while the role of SDBS is significant in increasing the latent heat, making this composite a potential candidate for Thermal Energy Storage system (TES) applications.
EFFECT OF SILICON RUBBER (SIR) IN FABRICATION OF NdFeB/BaFe12O19-BASED HYBRID MAGNET Ramlan, Ramlan; Soerya, Balada; Fachredzy, Amdy; Naibaho, Marzuki; Ginting, Masno
Indonesian Physical Review Vol. 7 No. 1 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i1.258

Abstract

The purpose of this study was to determine the effect of physical properties (density), magnetic properties (magnetic flux), and mechanical properties (tensile strength) of NdFeB- BaFe12O19 hybrid magnets with silicon rubber adhesive. NdFeB - BaFe12O19 permanent magnet has been made with a silicon rubber (SIR) adhesive mixture. The percentage variations of magnetic powder materials used are NdFeB: BaFe12O19 (95%: 5%) and NdFeB: BaFe12O19 (90%: 10%) mixed with a weight percentage of silicone rubber with variations of 20%, 40%, 60% and 80%. Characterization includes physical properties in the form of density where the sample with 20% SIR variation has the largest bulk density value of 3.28 g/cm3 for NdFeB: BaFe12O19 (95%: 5%) and 3.24 g/cm3 for NdFeB: BaFe12O19 (90%: 10%), and mechanical properties in the form of tensile strength where the most optimum elasticity value is at 80% silicone rubber. Meanwhile, the most optimum magnetic properties of materials are owned by material samples with variations of SIR at a concentration of 20% for sample variations of 95% NdFeB and 5% BaFe12O19, which is 602.8 Gauss.
Effect of Audio–Sonic Waves on Heat Transfer Enhancement in a Distilled Water-Based Heat Exchanger Tetuko, Agggito Pringgo; Sari, Ayu Yuswati; Simbolon, Silviana; Sebayang, Achmad M.S.; Effendi, Nur H; Ernando, Riko; Fachredzy, Amdy; Asri, Nining S; Setiadi, Eko A; Sebayang, Perdamean
Makara Journal of Technology Vol. 29, No. 1
Publisher : UI Scholars Hub

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Abstract

In this research, the influence of audio–sonic waves on distilled water used as the working fluid in a shell-and-tube heat exchanger was examined. The audio–sonic wave frequencies and flow rates of the cold and hot liquids were varied as follows: 4.85, 6.78, and 13.43 kHz for the audio–sonic waves; 0.3, 0.4, and 0.5 l/min for the cold liquid; and 0.76, 1.0, and 1.5 l/min for the hot liquid. An increase in the audio–sonic wave frequency enhanced both the overall heat transfer coefficient (U) and the enhancement factor (EF). The optimum values of U and EF, measured at 300 W/m3 ·°C and 1.05, respectively, were achieved at the highest frequency of 13.43 kHz. Additionally, the flow rates of the hot and cold liquids in the heat exchanger significantly influenced the optimal values of U and EF.
Co-Authors Anggito P. Tetuko, Anggito P. Ariadne L. Juwono Asri, Nining S Effendi, Nur H Ernando, Riko Manalu, Emmy S. Masno Ginting Muhammad Fauzi Nabawi, Muhammad A. H. Naibaho, Marzuki Perdamean Sebayang Ramlan, H. Sari, Ayu Yuswati Sebayang, Achmad M.S. Sebayang, Achmad Maulana S. Setiadi, Eko A Setiadi, Eko A. Sihotang, M. Sontang Simbolon, Silviana Soerya, Balada Tetuko, Agggito Pringgo