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All Journal G-Tech : Jurnal Teknologi Terapan
Pither Palamba
Universitas Cenderawasih, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Perbandingan Kinerja Toyota Kijang Model Innova G Produksi Tahun 2005 dan 2007 dengan Sistem Electrical Fuel Injection (EFI) Joni; Pither Palamba
G-Tech: Jurnal Teknologi Terapan Vol 7 No 4 (2023): G-Tech, Vol. 7 No. 4 Oktober 2023
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33379/gtech.v7i4.3140

Abstract

The increasing use of four-wheeled vehicles in land transportation now provides comfort in mobilization. The side effect of increasing exhaust emissions produced by vehicles is also increasing. Each make and model of four-wheeled vehicle has its own characteristics. One example is the Innova EFI, a model manufactured by Toyota and using an electronic fuel injection system. This car can reduce fuel consumption and reduce the impact of pollution at the combustion stage. The aim of this research is to determine the relationship between motor load variations and the composition of the exhaust gas produced. The measurements involve the use of a gas analyzer and a torque meter. The results showed that thermal efficiency reached its peak at 4000 rpm, for the 2005 Innova model the efficiency reached 29.49%, and the 2007 Innova reached 28.93%. The 2007 Toyota Innova vehicle has the lowest emission levels, with CO levels of 1.38% and HC 136 ppm.
Simulation Modeling of 140 MW CCGT Quality Indicators Based on DIN-VDI 4661 Standard Using Ebsilon® Professional Software Mickael Ruben Kaiway; Agustinus Giai; Nourish Christin Griapon; Yohanis Tangke Tosuli; Obet Takke Ranteallo; Samuel Parlindungan Siregar; Yohanis Yulius Wanane; Allo Sarira Pongsapan; Anastasia Sri Werdhani; Pither Palamba; Johni Jonatan Numberi
G-Tech: Jurnal Teknologi Terapan Vol 9 No 2 (2025): G-Tech, Vol. 9 No. 2 April 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i2.6614

Abstract

The operational efficiency of mid-capacity (140 MW) Combined Cycle Gas and Steam Power Plants (CCGT) remains underexplored concerning the DIN-VDI 4661 standard, which defines key quality metrics for energy systems. Addressing this gap is crucial for establishing standardized benchmarks to optimize performance and reduce energy losses. Existing studies mainly focus on Combined Cycle Gas Turbine (CCGT) units outside the 100–180 MW range and often do not explicitly follow DIN-VDI 4661, limiting efficiency comparisons and hindering targeted optimizations. This study simulates a 140 MW CCGT using Ebsilon® Professional software, incorporating DIN-VDI 4661 guidelines to assess eight quality indicators, including thermal efficiency, fuel utilization, and power-to-heat ratio. The model integrates gas and steam turbines, heat recovery, and auxiliary components, with input parameters validated against industry data. Energy balance analysis and sensitivity tests identified loss points. Results show a gas turbine thermal efficiency of 31.39%, steam turbine efficiency of 39.59%, and total system efficiency of 48.42%. However, significant energy losses (52% of input energy) were observed, mainly in gas turbines (87,000 kW) and steam turbines (56,000 kW). These findings highlight the need for design optimizations, such as improving heat recovery and turbine efficiency, to meet DIN-VDI 4661 benchmarks.
Co-Authors Agustinus Giai Allo Sarira Pongsapan Anastasia Sri Werdhani Johni J Numberi Joni Mickael Ruben Kaiway Nourish Christin Griapon Ranteallo, Obet Samuel Parlindungan Siregar Yohanis Tangke Tosuli Yohanis Yulius Wanane