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All Journal Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi International Journal of Marine Engineering Innovation and Research
Fahrudin
Universitas Pembangunan Nasional Veteran Jakarta
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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The Influence of Omni-Directional Guide Vane on the Cross - Flow Wind Turbine Performance Yahya; Fahrudin; Budhi Martana
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 4 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i4.4832

Abstract

As cities grow, the demand for energy increases, necessitating a corresponding increase in energy supply. Since urban areas consume the majority of the world’s energy, switching to renewable energy sources is essential. Wind energy is one of the most popular renewable energy sources for generating electricity. Vertical-axis wind turbines (VAWTs) are used in urban areas due to their advantages, with cross-flow wind turbines (CFWTs) being one type. However, the efficiency of CFWTs is relatively low, necessitating the application of augmentation devices. This study aims to find the optimal configuration between CFWTs and Omni-Directional Guide Vanes (ODGV), using 6DOF dynamic mesh methods in ANSYS Fluent with varying the turbine blade counts and the addition of ODGV. The results showed that the 18-blade configuration exhibits the highest improvement with ODGV, demonstrating a remarkable 71 percent increase in the power coefficient. In general, the highest performance is achieved by the 20-blade turbine with a 6-blade ODGV configuration, with a power coefficient of 0.2455, which is 30 percent higher than the baseline 20-blade turbine. These findings indicate that the addition of ODGV significantly improves the performance of cross-flow wind turbines.
Experimental Study on Refuse-Derived Fuel Moisture Content and Gasification Efficiency for Sustainable Energy Putty Fauthyda Zahra Hapidzha; Damora Rhakasywi; Fahrudin; Regina N. Lumbantoruan; Fazli Iqbal Pasha; M. Reza Marista; Firmansyah
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.10087

Abstract

This study investigates the effect of moisture content in Refuse-Derived Fuel on gasification efficiency at a Waste-to-Energy Power Plant in Surakarta. Using a fixed-bed downdraft gasifier, the research experimentally tests two MC levels of 20% and 50%. High moisture content can absorb significant thermal energy during evaporation, potentially lowering reaction temperatures and syngas quality. The primary objective is to determine the optimal moisture content that maximizes Cold Gas Efficiency and syngas heating value. Results indicate that high feedstock moisture content triggers severe thermal damping within the gasifier core. Parasitic energy consumption for water vaporization significantly suppressed internal bed temperatures (Reactor and Belly zones), thereby chemically quenching primary endothermic carbon-cracking pathways. The mean Cold Gas Efficiency plummeted from an optimized peak of 42.86% in April down to a compromised level of 28.30% in June. These findings provide critical quantitative data and demonstrate that enforcing strict mechanical pre-treatment drying to lock the input moisture threshold near 20% is thermodynamically mandatory to avoid reaction quenching and ensure commercial power-generation viability in tropical climates.
Hydraulic Performance Evaluation of Cooling Water Systems in Air Separation Units Using Pressure Drop Muhammad Fadhil Nasrullah; Fahrudin; Nicky Yonkimandalan; Shofia Putri Aulia; Putty Fauthyda Zahra Hapidzha; Regina N. Lumbantoruan
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.10267

Abstract

Cooling water systems are crucial for maintaining the reliability of industrial processes. Excessive pressure losses in the pipeline network increase the system head requirements, resulting in higher pump power consumption and reduced hydraulic performance. This study aims to evaluate the hydraulic performance of the cooling water system through pressure drop analysis and pump operating point evaluation under actual operating conditions. Major losses were calculated using the Darcy–Weisbach equation, while minor losses were determined using the Crane loss coefficient method. The total pressure drop was converted to system head and then used to calculate hydraulic power, pump shaft power, and pump operating point. The results showed a total major loss of 243,459.40 Pa, a total minor loss of 488,497.74 Pa, and a total pressure drop of 731,957.15 Pa, which corresponds to a system head of 74.61 m. The calculated hydraulic power and pump shaft power were 14,233 kW and 21,896 kW, respectively. The operating point evaluation confirmed that excessive hydraulic resistance affected the pressure distribution in the cooling water system. The proposed pump selection meets the calculated hydraulic requirements and provides an engineering basis for improving system reliability, hydraulic efficiency, and pump performance.
Co-Authors Budhi Martana Damora Rhakasywi Fazli Iqbal Pasha Firmansyah M. Reza Marista Muhammad Fadhil Nasrullah Nicky Yonkimandalan Putty Fauthyda Zahra Hapidzha Regina N. Lumbantoruan Shofia Putri Aulia Yahya