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All Journal METAL : Jurnal Sistem Mekanik dan Termal TEKNOSIA
Agus Suandi
Universitas Bengkulu
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Optimalisasi Dimensi Tabung Roasting Kopi Kapasitas 2 kg dengan Pendekatan Model Elemen Hingga Dedi Suryadi; Bowo Anugrah; Ahmad Fauzan Suryono; Agus Suandi; Novalio Daratha
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (718.232 KB) | DOI: 10.25077/metal.6.1.1-7.2022

Abstract

Coffee roasting is an important process in the coffee industry that determines the quality of the coffee beverage obtained. The roasting process is carried out in a cylindrical tube having high temperature. Therefore, thermal stress on the cylindrical tube (drum) should be focused. In this paper, both appropriate materials selection and optimal dimension of the roaster drum are considered. Drum is given both thermal load of 200oC and a coffee load of 2 kg. Here, Aluminum Alloy 5083 and Stainless Steel 304 are analyzed as drum materials because these materials are recommended for foods. Finite element method is used for drum analysis with axisymmetric model. Moreover, optimal dimension of drum can be obtained by varying the length, diameter and thickness. The results show that Stainless Steel 304 is suitable material for drum under both thermal load and both thermal load of 200oC and a coffee load of 2 kg. While, dimensions of drum are length of 450 mm and diameter of 180 mm with thickness of drum larger than 1 mm.
PENGARUH AIR FUEL RATIO (AFR) TERHADAP EFISIENSI TURBIN GAS PADA PLTGU UNIT 2 PT. PLN (PERSERO) KERAMASAN PALEMBANG-PROVINSI SUMATERA SELATAN Angky Puspawan; Rifki Sulthan; Agus Suandi; Yovan Witanto
Teknosia Vol. 17 No. 1 (2023): Juni 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/teknosia.v17i1.28754

Abstract

Gas turbine efficiency is an indicator to determine the performance of a generator. The greater the efficiency value of the gas turbine in a generator, the better the performance of the generator. One of the things that affect the value of the efficiency of a gas turbine is the air fuel ratio. Air Fuel Ratio (AFR) is the ratio of the amount of air and fuel in the combustion process in units of mass or volume. Air fuel ratio is a factor that affects the perfection of the combustion process in the combustion chamber. In the graphic image it can be seen that the lowest AFR values ​​are on July 3 and 4 2022, when the gas turbine produces a loading of 20900 kW and 20100 kW with an AFR value of 39.76 unitless each. Whereas the highest AFR value is on June 28 2022 when the gas turbine produces a loading of 20780 kW with an AFR value of 40.68 unitless. The highest gas turbine efficiency value is on June 30, 2022, at a loading of 20,650 kW with a gas turbine efficiency of 83.3%. The lowest efficiency value is on July 2, 2022, at a load of 20,800 kW with a gas turbine efficiency of 81.05%. From the results of existing data processing and graphs, it can be seen that the value of the air fuel ratio and the efficiency of the gas turbine are inversely proportional, which means that when the value of the air fuel ratio decreases, the value of the efficiency of the gas turbine tends to increase. However, there are some deviations when the value of the air fuel ratio decreases, the efficiency of the gas turbine also decreases. Therefore it can be concluded that the value of the air fuel ratio affects the value of the efficiency of the gas turbine, however, the value of the air fuel ratio is not the only factor that affects the value of the efficiency of the gas turbine.
Co-Authors Ahmad Fauzan Suryono Angky Puspawan Bowo Anugrah Dedi Suryadi Novalio Daratha Rifki Sulthan Yovan Witanto