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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY
Burhan hafid
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Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Kaji Eksperimental Torsi Statik Dan Torsi Dinamik Turbin Hidrokinetik Savonius Type Bach Tiga Sudu Burhan hafid; Iwan Kurniawan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The potential of hydropower energy in Indonesia is very large, the country of Indonesia has small rivers that continous to flow in the irrigation canal. Hydrokinetic energy can be used in savonius turbines, with the density of water greater than the density of air, the Savonius hydrokinetic turbine can extract sufficient kinetic energy even at low water flow rates.The purpose of this study was to determine the static torque and dynamic torque produced from savonius turbine type of bach three- blades.The hydrokinetic turbines studied were savonius turbine type of bach three- blades with aspect ratio of 1.1, overlap ratio 0.2, rotor height (H) 0.3m, rotor diameter (D) 0.33m, turbine diameter (d) 0, 3m, and with variations in the velocity of water flow (V) 0.3 m / s and 0.65 m / s the test is carried out in a water tunnel. Both of these torsions are obtained in stationary conditions (static torque) for the azimuth each angle and moving conditions (dynamic torque) of no load and until it stops rotating. By utilizing the braking force on pulley with variations in loading. Based on the data obtained, the results of savonius turbine type of bach three- blades. research result in dynamic torque of 0.456 Nm and 0.816 Nm, for the average static torque produced is 0.427 Nm and 0.788 Nm at each azimuth angle.Keywords : Savonius Turbine, Static Torque, Dynamic Torque
Analysis of Heat Transfer in Shell and Tube Type Condensers Rifaldo, Zulpikar; Burhan Hafid; Zakir Husin; Etanto Heiliano Wijayanto; Idris, Muhammad
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 8 No. 1 (2024): June 2024 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v8i1.6238

Abstract

A heat exchanger is a device used to exchange or change the temperature of a fluid by exchanging heat with another fluid. One of the heat exchangers is a surface type condenser where the steam is separated from the cooling water, the steam is outside the pipes while the cooling water is in the pipes at PT. SOCIMAS. At PT. SOCIMAS, the condenser is part of the main cooling system which functions to condense steam into water and maintain the efficiency and work cycle of the turbine high. For this reason, this final project report focuses on condenser analysis. The results obtained from this final project are the value of the inner convection coefficient of 4056.6827 W/(m2.K) and the outer convection coefficient of 97414.18W/(m2.K) . value of heat transfer rate and effectiveness (ε) on the condenser PT. SOCIMAS obtained a heat transfer rate of 153.6001264 MW. While the effectiveness (ε), obtained 0.99571 % This shows that the condition of the condenser is quite good, because the steam can go to the condenser, so that the rate of heat transfer and the effectiveness of the condenser are able to condense the steam into liquid.
Performance Analysis of TiAlN/TiN PVD Coated Carbide Tools in High-Speed and Dry Machining of AISI 1070 Alloy Steel Sumawijaya, Sumawijaya; Albert Hendi Yanto Larosa; Yakmuri Lubis; Burhan Hafid
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 8 No. 2 (2024): December 2024 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v8i2.12592

Abstract

This study investigates the performance of TiAlN/TiN PVD-coated carbide tools in high-speed, dry machining of AISI 1070 alloy steel. AISI 1070 is a high-carbon steel known for its exceptional hardness, making tool wear a significant challenge. The research focuses on evaluating tool wear, wear mechanisms, and optimal cutting parameters. Quantitative assessments of flank wear (VB) were conducted, alongside detailed Scanning Electron Microscopy (SEM) analyses to identify the primary wear mechanisms, such as abrasion and adhesion. The study determined that the optimal cutting conditions for minimal tool wear include a cutting speed of 231 m/min, a feed rate of 0.1 mm/rev, and a depth of cut of 1 mm. The TiAlN/TiN coatings significantly enhanced the tools' wear resistance and longevity, maintaining their cutting-edge sharpness under strenuous conditions. Additionally, the coatings effectively minimized the formation of white layers on the machined surface, preserving the mechanical properties and surface integrity of the alloy. These findings demonstrate the coatings' superiority in reducing friction and heat generation during high-speed machining. The study provides valuable insights for industrial applications, highlighting the potential of TiAlN/TiN-coated carbide tools to improve tool performance, operational efficiency, and overall productivity in high-speed machining environments.
Exergy Analysis in the Application of Exhaust Heat Utilization Through Diesel Engine Cooling Unit for Organic Rankine Cycle Burhan Hafid; Ibnu Hajar; Reinaldi Teguh Setyawan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 9 No. 2 (2025): December 2025 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v9i2.15647

Abstract

A Very rapid population growth has resulted in fossil energy being gradually depleted and environmental pollution getting worse. So far, burning fossil fuels has produced about 40% of global carbon dioxide (CO2) emissions, which are considered a major source of greenhouse gases. The Internal Combustion Engine (ICE) has become the main power source for cars, trucks, locomotives, and ships. In ordinary diesel engines, less than 45% of the fuel energy can be converted into useful work output from the crankshaft, and the remaining energy is largely lost through exhaust gases and jacket water. One way that can be done is to utilize the waste from the internal combustion engine (ICE). This method uses the Organic Rankine Cycle (ORC) system by utilizing the wasted heat generated by the Diesel engine when operating, through the engine coolant coming out of the engine gap (water jacket) to the radiator. In this study, the study focused on the exergy analysis of each component in the ORC system integrated in the diesel engine cooling unit which was simulated using Aspen Plus software. The analytical method used in this study is the exergy method with variations in ambient temperature of 20oC, 21oC, 22oC, 23oC, 24oC, 25oC, 26oC, 27 oC, and 28 oC using the working fluid R141B. The results showed that the greatest exergy destruction was found in the components of the pump, evaporator, and turbine.
Co-Authors Albert Hendi Yanto Larosa Anak Agung Gede Sugianthara Etanto Heiliano Wijayanto Ibnu Hajar Muhammad Idris Reinaldi Teguh Setyawan Rifaldo, Zulpikar Sumawijaya, Sumawijaya Yakmuri Lubis Zakir Husin