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Asrul Aziz
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Mechanical Engineering

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ANALISIS KOMPOSISI GAS BUANG AKIBAT PERUBAHAN MAIN JET NOZZLE PADA SISTEM KARBURATOR MESIN Bernadi Ksatria Putra; Abrar Riza; Asrul Aziz
Jurnal Ilmiah Teknik Mesin POROS Vol 13, No 2 (2015): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (739.263 KB) | DOI: 10.24912/poros.v13i2.820

Abstract

Abstract: Fuel entering through the main jet nozzle, affects engine performance and the composition of the exhaust gas is produced. Research the composition of the exhaust gases in machines otto one cylinder done with experimental method. The purpose of this study was to obtain the characteristics of the engine with exhaust gas analysis method. This research done with varying size main jet nozzle and varying the engine rotation every 400 rpm. Data processing the results of testing includes a comparison of the composition of the exhaust gases is HC, CO2, CO, O2, AFR, and the temperature of the exhaust gases. Then calculate the enthalpy of combustion for each main jet nozzle. The composition of the exhaust gases are best obtained from the main jet nozzle GX 160 which has the highest CO2 value of 20%, with the lowest CO value of 1.26% and the largest combustion enthalpy value with the value of 264.769 kJ. From the analysis can be known that the burning of the main jet nozzle GX 160 approaching the stoichiometric combustion. 
SISTEM KONTROL PADA KENDARAAN RODA DUA BERPENGGERAK HIBRIDA Didi Widya Utama; Kennard Dharmmabakti; Asrul Aziz
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (831.615 KB) | DOI: 10.24912/poros.v12i2.569

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Abstract: This hybrid motorcycle design is to combine 5.65kW gasoline engine and 48V DC 0.5kW electrical brushless motor in serial-parallel type. Master control unit use a microcontroller ATMega16 to control gasoline engine and electrical motor alternately. Speed sensor is placed on the rear wheel to detect the motorcycle’s speed. When the motorcycle’s speed reaches the top threshold at 30km/h, it driven with gasoline engine and when the motorcycle’s speed getting lower to the bottom threshold at 5km/h, it changes with electrical motor. Battery charged with plug-in system to power supply. 
UJI EKSPERIMENTAL MESIN PENDINGIN BERPENDINGIN AIR DENGAN MENGGUNAKAN REFRIGERAN R22 DAN REFRIGERAN R407C Terry Gunawan; Harto Tanujaya; Asrul Aziz
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.95 KB) | DOI: 10.24912/poros.v12i2.570

Abstract

Abstract: The human needs of refrigeration system have created a tool that called a refrigerator. Refrigerator/cooling machine have a component which have a very important role in the refrigeration system that is refrigerant. Refrigerant that still widely used for cooling machine until now is the refrigerant R22. Using R22 refrigerant can cause environmental problems such as damage to the ozone layer and global warming. Therefore, it needs a substitution refrigerant which is more friendly for environment which one of them is R407C refrigerant. In this study, using a cooling machine with water- cooled condenser and the flowrate that use is 20 L/h, 40 L/h, 80 L/h and 120 L/h. The variables that measured in this study is temperature (T1, T2, T3, T4, T10, T11), pressure (P1, P2, P3, P4), and ampere. This study aims to get the test results using refrigerants R22 and R407C. The processing data of the test result include refrigeration capacity, compressor power and COP. The results obtained have that cooling machine which use R22 refrigerants have a better COP than using R407C refrigerant. This is happen because the power needed by the compressor to compress R407C refrigerant to flow in the system is greater than using R22 refrigerant. 
Co-Authors Abrar Riza Bernadi Ksatria Putra Harto Tanujaya Kennard Dharmmabakti Terry Gunawan Utama, Didi Widya