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All Journal FLYWHEEL : Jurnal Teknik Mesin Untirta Teknika: Jurnal Sains dan Teknologi
Listijorini, Erny
Universitas Sultan Ageng Tirtayasa
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Designing Size and Stack Number of Fuel Cell Urban Vehicle Nazwa, Intan; Satria, Dhimas; Jannah, Miftahul; Listijorini, Erny; Setiawan, Ipick; Pinem, Mekro Permana; Suprayogi, Dedy Triawan; Kanani, Nufus; Demustila, Harly
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 10, No 1 (2024): April
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v10i1.25506

Abstract

A fuel cell converts the energy in the chemical reaction of a continuously supplied fuel and its oxidizing agent into electrical energy. Fuel cells are used in various industries, including the automotive industry. In this context, fuel cell electric vehicles (FCEVs) have emerged as a promising alternative that offers zero emissions and competitive performance. This work was conducted to obtain a fuel cell design and determine the fuel cell modeling that suits the needs of FCEVs. The Pahl and Beitz method with QFD is used. It was found that the type of fuel cell used is PEMFC (Proton Exchange Membrane Fuel Cell) with platinum electrode material, and the fuel used is hydrogen on a small scale. Overall, fuel cell dimensions were 175 x 259 x 175 mm, and the number of fuel cell stacks that can be arranged is 35. With this geometry, the factor of safety value obtained at the stack fuel cell is 26, and at the end plate fuel cell 2.4, this value indicates that the PEMFC design is safe. Then, the output voltage is 50.55 V, and the output current is 25.27 A, so the power generated is 1.277 kW.
Preliminary study-design of a piezoelectric floor energy harvester Susilo, Sidik; Listijorini, Erny; Ahendyarti, Ceri; Febrianto, Ilham; Adhiwindoro, Akhmad
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.23034

Abstract

A piezoelectric-based electrical energy harvesting device has been designed using a cantilever method that originates from mechanical pressure from humans climbing stairs. The method in this research uses an experimental method where there are variations in the load given by humans of 55 Kg, 65 Kg, and 75 Kg to provide force on an energy harvester that has 4 piezoelectric circuits installed, 38 of which are installed in series and parallel. piezoelectric, where the four circuits have a number of piezoelectrics of 10, 8, 10 and 8 piezoelectrics on each side. The resulting voltage will later be rectified using a rectifier bridge until it will be temporarily stored in the capacitor. The voltage is rectified using a rectifier bridge and stored in capacitors. The test was carried out in conditions where the respondent was walking leisurely and running. The results obtained without a rectifier circuit is 0.87 V, 1.06 V, 1.08 V. For a parallel circuit it is 0.78 V, 0.87 V, 0.96 V. In the rectifier circuit, it is obtained for a series circuit of 0.53 V, 0.66 V, 0.75 V. Electric current 0.01 mA, 0.03, 0.06 mA for parallel circuits 0.46 V, 0.78 V, 1.07 V and electric current 0.05 mA, 0.06 mA, 0.019 mA.
Microstructure Features and Degradation Mechanisms of Low-Pressure Evaporator Tube Steels in Combined Cycle Power Plants Nugraha, YangYang Gilang; Erwin, Erwin; Listijorini, Erny; Dwinanto, Dwinanto; Alhamidi, Ahmad Ali; Satria, Dhimas; Saefuloh, Iman; Yusuf, Yusvardi; Sunardi, Sunardi
FLYWHEEL : Jurnal Teknik Mesin Untirta Vol 10, No 2 (2024): October
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/fwl.v10i2.39002

Abstract

A leakage failure occurred in a low-pressure evaporator tube of a Heat Recovery Steam Generator (HRSG) in a combined cycle power plant. The failed tube, manufactured from ST 37.8 CL1 steel, was investigated to determine the root cause of failure. The analysis included visual inspection, metallographic examination, and hardness testing. Visual observation revealed localized leakage regions associated with material degradation. Metallographic analysis showed a ferrite–pearlite microstructure with pronounced pearlite growth and the presence of micro-cavities concentrated along grain boundaries. Hardness measurements indicated that the failed tube exhibited higher hardness values (average 83.3 HRB) compared to unused material (average 76.6 HRB), reflecting microstructural evolution during service. The tube operated at approximately 143.8 °C under continuous internal pressure. Long-term exposure to these conditions promoted creep damage, characterized by the nucleation of micro-cavities at ferrite–pearlite interfaces. Progressive cavity growth and coalescence reduced ductility and facilitated crack initiation, ultimately leading to leakage. The findings demonstrate that creep-induced cavity formation associated with pearlite growth was the primary failure mechanism of the low-pressure evaporator tube.
Co-Authors Adhiwindoro, Akhmad Alhamidi, Ahmad Ali Ceri Ahendyarti Dhimas Satria Dwinanto, Dwinanto Erwin, Erwin Febrianto, Ilham Harly Demustila Jannah, Miftahul Kanani, Nufus Nazwa, Intan Nugraha, YangYang Gilang Pinem, Mekro Permana Saefuloh, Iman Setiawan, Ipick Sunardi, Sunardi Suprayogi, Dedy Triawan Susilo, Sidik Yusuf, Yusvardi