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Journal : Jurnal Dinamis

ANALISA PENGUJIAN PENGARUH PEMAKAIAN ZAT ADITIF TERHADAP PERFORMANSI MESIN OTTO Tulus Burhanuddin Sitorus
Jurnal Dinamis No 4 (2009)
Publisher : Jurnal Dinamis

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Abstract

In this study the addition of additives for gasoline aims to improve engine performance through the quality of fuel combustion with air so that combustion can take place completely and to reduce emissions. This study also expected to benefit the education and research to know the effect of additives on engine performance. Research methods of testing, data collection and processing of test results data. Test data is processed include torque, power, specific fuel consumption, volumetric efficiency, thermal efficiency and emissions. The results showed that the mixture of gasoline additives (C2:40) has a calorific value of the highest compared with other mixtures, this is due to a change in the composition of the fuel. Increased torque at C1:40 and C2:40, but decreased in C3:40. This is because the heating value of fuel in C3: 40 also decreased. While the power produced is influenced by the torque generated by the engine. For the parameters specific fuel consumption (SFC) in each mixture is lower than usual when using the gasoline engine. At engine speed 3000 rpm and load 25 kg obtained by the use of the lowest fuel. Volumetric efficiency increases slightly with the addition of the additive content in the fuel mixture in which the smallest volumetric efficiency occurs when the engine using gasoline fuel. Thermal efficiency for a mixture of fuel consumption is greater than using gasoline. For the parameters emissions, the use of additives mixed with gasoline to make the percentage levels of CO, unburned hydro carbon(UHC) and CO2 decreased.
TINJAUAN TEORITIS PERFORMANSI MESIN BERTEKNOLOGI VVT-i Tulus Burhanuddin Sitorus
Jurnal Dinamis No 5 (2009)
Publisher : Jurnal Dinamis

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Abstract

AbstractTechnology of variable valve timing intelligent (VVT-i) is one of the application of information technology in the automotive industry particularly in terms of engine performance improvements. VVT-i is the valve settings combustion technology. The fundamental difference is owned by VVT-i system is the intake cam rotation need not exactly match the rotation of the engine. In cars without VVT-i system, intake cam has only one valve opening pattern making machines can not maximize engine power when needed and a large force can not minimize the fuel used when the power needed is not large. While in the car with the engine VVT-i technology, when the driver requires a larger force, the valve mechanism will be arranged so that engine torque can be increased. Conversely, when it only takes a little engine power, the valve mechanism will be arranged so that fuel is used much less and of course the resulting exhaust gas cleaner. The results of theoretical studies indicate that the engine with VVT-i technology has torque and the optimal engine power in all conditions and workload with the use of more fuel-efficient.Keywords : VVT-i technolog; Engine performance; Torgue
ANALISA EFISIENSI ELEKTROLISIS AIR DARI HYDROFILL PADA SEL BAHAN BAKAR Otto Sebastian; Tulus Burhanuddin Sitorus
Jurnal Dinamis No 12 (2013)
Publisher : Jurnal Dinamis

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Abstract

ABSTRAKDunia sedang mengalami krisis energi karena bahan bakar minyak dan gas berkurangtajam akibat penggunaan secara besar-besaran oleh manusia.Manusia dihadapkan padasituasi menipisnya cadangan sumber energi fosil dan meningkatnya kerusakan lingkunganakibat penggunaan energi fosil.Sebelum terjadi krisis energi di dunia, harus dicari energialternatif yang dapat diperbaharui.Salah satu bentuk energi alternatif yang saat ini menjadiperhatian besar adalah hidrogen. Dimana suplai energi yang dihasilkan sangat bersih karenahanya menghasilkan air sebagai emisi. Daya hidrogen terutama dalam bentuk sel bahan bakarhidrogen (hydrogen fuel cells) menjanjikan penggunaan bahan bakar yang ramah lingkungan.Fokus kajian ini mengenai Fuel Cell..Jenis Fuel Cell yang dikaji adalah Polymer ElectrolyteMembrane (PEM). Tujuannya adalah Menganalisa Efisiensi Elekrolisis air pada Hydrofill besertaKerugian tegangan Perpindahan Muatan, dan Kesetimbangan Energi pada Fuel Cell. Hasil darikajian untuk efisiensi elektrolisis air adalah 29,83%, Kesetimbangan Energi didapat 2762.1W,dan untuk Aliran Pendinginan Massa didapat 0.035g/s. Kesimpulan dari hasil kajian yaitu agarelektrolit dibuat setipis mungkin dengan bahan konduktivitas yang tinggi agar tidak terjadikehilangan tegangan dan mengoptimalkan transportasi massa di aliran membran.Kata kunci : Hydrogen Fuel Cells,Polymer Electrolyte Membrane, EfisiensiAbstractThe world unrenewable energy such as petroleum and gases have decreasedramatically because of the massive use for humanity using.Humansfaced withdepletionoffossil energy resourcesand increasingenvironmental damageresulting from the useof fossilenergyBefore facing crisis energy, developing another alternative energy such as renewableenergy was needed.One form ofalternative energythat is currentlyof great concernis hydrogen.Where the supply ofenergy producedis verycleanbecause it onlyproduces water asemissions.Hydrogenpoweris mainlyin the form ofhydrogen fuel cellspromisesthe useof environmentallyfriendlyfuels. Focus of this study is about Fuel Cell. Type of Fuel Cell is Polymer ElectrolyteMembrane (PEM.).The goal isanalyzetheefficiency of electrolysis wateron Hydrofill with chargetransfer voltage loss ,and FuelCell Energy Balance.The resultsofthestudyforwaterelectrolysisefficiencyis29.83%, , forEquilibriumEnergy obtained2762.1W ,andforMassFlowCoolingobtained0.035g /s.Conclusions from thestudyisthatthe electrolyteismadeas thin aspossible witha highconductivity materialin order to avoidloss of voltageandoptimizethe flow ofmass transportinthe membraneKeywords :Hydrogen Fuel Cells,Polymer Electrolyte Membrane, Efficiency