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All Journal Scientific Journal of Mechanical Engineering Kinematika Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Fauzun
Universitas Gadjah Mada
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Pengaruh Perbedaan Mesh Terstruktur dan Mesh Tidak Terstruktur Pada Simulasi Sistem Pendinginan Mold Injeksi Produk Plastik Angger Bagus Prasetiyo; Fauzun; Azhim Asyratul Azmi; Didit Setyo Pamuji; Rizqi Ilmal Yaqin
Retii Prosiding Seminar Nasional ReTII Ke-14 2019
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Determination of the type of mesh and mesh manufacturing density plays a very important role in a simulation, this is due to minimize the time and computational costs. This study presents a comparison of the influence of mesh on CFD analysis. Mesh is the most important part in doing a simulation. Mesh is good, affects the calculation results of a simulation. To simulate internal flow in injection molding cooling channels to make it more accurate. There are three types of mesh that are applied in a simulation of this study, namely: hexahedral, polyhedral, and tetrahedral mesh are applied to simulate the internal flow of cooling channel injection molding using the k-epsilon turbulence model. Simulation results show that the simulation method using the polyhedral mesh is proposed to be able to speed up calculations and accelerate the convergence of the simulation as evidenced by an iteration graph. The use of polyhedral mesh in CFD simulations is more effective than using tetrahedral or hexahedral mesh. However, the use of hexahedral mesh simulation results is closer to the experiment and requires a long iteration time. In addition, the result is polyhedral mesh requires less computational time than hexahedral mesh and tetrahedral mesh. Using polyhedral mesh in CFD was found to be more effective than using tetrahedral elements.
PENGARUH THREE QUARTER BAFFLE TERHADAP LAJU PERPINDAHAN KALOR DAN DAYA POMPA PADA KONDENSOR VERTIKAL Cahyo Wibi Yogiswara; Fauzun; Muhammad Salim Taufiqurrahman
Scientific Journal of Mechanical Engineering Kinematika Vol 10 No 2 (2025): SJME Kinematika Desember 2025
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v10i2.730

Abstract

A condenser is a heat exchanger that functions to convert vapor into liquid. One of the most commonly used of condensers is the shell and tube. This study was conducted on a laboratory-scale vertical condenser to determine the heat transfer coefficient, pressure drop, and the ratio of heat transfer rate to the required pump power. In this study, variations were made in four types of baffles and three mass flow rate ratios. The baffle types used include segmental, disc and doughnut, and three-quarter with 90° and 180° configurations. Meanwhile, the mass flow rate ratio was varied based on theoretical values, namely 90%, 100%, and 110% of the theoretical value. The condenser used is a shell and tube, where the hot fluid flows through the tube, and the cold fluid flows through the shell. Experimental results show that variations in baffle type and mass flow rate ratio significantly affect the heat transfer coefficient and the ratio of heat transfer rate to pump power. The three-quarter baffle with a 90° configuration demonstrated the best performance, with a heat transfer coefficient of 83.27 W/m²°C and a heat transfer rate-to-pump power ratio of 1.64 at a water flow rate of 2.2 GPM.
PENINGKATAN EFISIENSI PHOTOVOLTAIC MENGGUNAKAN LIQUID COOLING SERPENTINE DENGAN VARIASI LAJU ALIRAN PADA IKLIM TROPIS Bintang Arif Prasetya; Indro Pranoto; Fauzun
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 2 (2026): SJME Kinematika December 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i2.909

Abstract

Global growth in electricity demand and the environmental impact of fossil fuels have accelerated the adoption of photovoltaic (PV) technology. However, PV efficiency significantly degrades under high outdoor thermal loads, where every 1°C rise in temperature reduces efficiency by approximately 0.3-0.5%. This study evaluates an active thermal management system (TMS) based on a serpentine liquid channel integrated with a dual-axis solar tracker on a 100 Wp monocrystalline PV module. Outdoor experimental research was conducted at Universitas Gadjah Mada in April 2026. Water flow rates of 1.5 LPM and 2.5 LPM were analyzed to determine their impact on performance. To ensure a fair comparative evaluation under dynamic weather conditions, cooling performance was evaluated against an analytical non-cooled baseline calculated using standard STC coefficients driven by real-time environmental data. The results demonstrate that the TMS significantly lowered cell temperatures. At 1.5 LPM, the average temperature reduction was 12.43°C, while 2.5 LPM achieved a better reduction of 14.58°C. The heat transfer coefficient increased by 43.1%, rising from 322.77 W/m²K at 1.5 LPM to 461.89 W/m²K at 2.5 LPM. Consequently, average gross electrical efficiency improved from a non-cooled of 14.69% to 15.63% at 2.5 LPM, representing a 6.4% relative increase. While the 2.5 LPM flow rate achieved the better gross electrical efficiency, the 1.5 LPM configuration yielded slightly better net efficiency after accounting for the pump load. These findings confirm that increasing water flow rates within serpentine channels effectively maintains the PV temperature and improves its gross efficiency.
Co-Authors Angger Bagus Prasetiyo Azhim Asyratul Azmi Bintang Arif Prasetya Cahyo Wibi Yogiswara Didit Setyo Pamuji Indro Pranoto Muhammad Salim Taufiqurrahman Rizqi Ilmal Yaqin