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All Journal Jurnal Teknik ITS Journal of Engineering and Technological Sciences JMES The International Journal of Mechanical Engineering and Sciences
Prabowo Prabowo
Institut Teknologi Sepuluh Nopember
Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Studi Eksperimen Pengaruh Kecepatan Udara Pengering Inlet Chamber Pada Swirling Fluidized Bed Dryer Terhadap Karakteristik Pengeringan Batubara Dicky Permana; Prabowo Prabowo
Jurnal Teknik ITS Vol 5, No 2 (2016)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1037.047 KB) | DOI: 10.12962/j23373539.v5i2.20803

Abstract

Energi listrik merupakan energi yang dominan dibutuhkan untuk kehidupan manusia. Salah satu sumber penghasil listrik yaitu Pembangkit Listrik Tenaga Uap (PLTU). Bahan bakar utama PLTU pada umumnya  adalah batubara. Ketika digunakan batubara kalori rendah maka dibutuhkan suplai batubara yang lebih banyak sehingga pulverizer akan bekerja ekstra. Masalah akan timbul ketika pulverizer rusak, dimana suplai batubara ke boiler akan berkurang yang menyebabkan kapasitas produksi listrik menurun. Untuk menghidari hal tersebut dilakukan proses pengeringan. Fluidized bed dryer merupakan salah satu teknologi dari proses proses pengeringan yang bisa digunakan untuk meningkatkan kalori batubara dengan mengurangi moisture content yang ada dalam batubara. Penelitian ini dilakukan dengan studi eksperimen menggunakan alat percobaan yaitu swirling fluidized bed coal dryer. Udara panas dengan temperatur 45oC dihembuskan oleh blower ke dalam chamber yang divariasikan pada kecepatan 2 m/s, 2,5 m/s dan 3 m/s melewati distributor blade sudut 20o sehingga kontur udara menjadi swirl. Pengambilan data dilakukan dengan menimbang massa sampel batubara basah setiap 1 menit sebanyak 15 kali dan 2 menit sebanyak 8 kali sehingga total waktu pengeringan 31 menit. Percobaan dilakukan dengan beban pengeringan 600 gram dan ukuran partikel 6 mm, dilanjutkan dengan pengovenan temperatur 1050 C selama 180 menit untuk mencari berat kering berdasarkan standar ASTM D 3173. Dari hasil eksperimen diketahui bahwa pada kecepatan 2 m/s, 2,5 m/s dan 3 m/s didapat drying rate batubara berturut-turut sebesar 1,9806 % per menit, 2,638 % per menit dan 3,1182 % per menit. Untuk koefisien perpindahan massa berturut-turut sebesar 0,065203 m/s, 0,072052 m/s dan 0,078264 m/s.
Study of the Evaporation Process in the Spray Zone of a Mechanical Draft Wet Cooling Tower Dany Iman Santoso; Bambang Antoko; Prabowo Prabowo; Djatmiko Ichsani
Journal of Engineering and Technological Sciences Vol. 53 No. 2 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.2.4

Abstract

The evaporation process in the nozzle spray system of a cooling tower was the main object of study in order to determine its performance. This process involves liquid water in small size, usually at the droplet level. At this level, parameters that affect the droplet size, such as capacity, air velocity in the chamber, water pressure at the nozzle, atmospheric temperature, etc., influence the process of heat and mass transfer. In this study, capacity and fan rotation were varied to obtain a graph showing the evaporation. Radius, velocity, mass and temperature graphs and rate graphs were obtained from mathematical modeling of the governing equations. From the results it appears that evaporation occurs at a capacity of 6 liter per minute and above, but this requires further proof of the evaporation process along with the height of the tower, which will be the subject of a future study.
Numerical Study of Flow and Heat Transfer Characteristics on Flat Fin with Staggered Tube Arrangement in Transitional Turbulent Flow Mahadika Favian Alfandaviska; Prabowo Prabowo
JMES: The International Journal of Mechanical Engineering and Sciences Vol 4 No 2 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i2.7835

Abstract

Three-dimensional computational fluid dynamic simulations were conducted for flow and heat transfer characteristics around flat fin with staggered tube arrangement to fulfill the cooling performance of the tube fin heat exchanger. Fins are generally used to increase the heat transfer area, so the fin material has a high impact on the heat transfer rate. The material wall fin and tube were changed in three steps: aluminum, steel, copper with two different velocities of 8 and 15 m/s flowing between fins. The geometry of the flat fin and tube used staggered tube arrangement using transversal spacing, ST, of 11.8 mm, longitudinal spacing, SL, of 22.2 mm, and flow depth 66.6 mm. GAMBIT 2.6 software was used to meshing the geometry, and FLUENT 18.0 was implemented to simulate flow and heat transfer. The results show that the fin with copper material has a more uniform temperature distribution along the fin than the other materials. This indicates that the copper material has a higher heat transfer rate compared to aluminum and steel. Furthermore, increasing velocity will make the separation point formation farther behind the tube and decrease the recirculation zone. Moreover, 8 m/s has a lower outlet temperature than 15 m/s. As a result, 8 m/s and copper material have the highest effectiveness of 16.47 and efficiency of 88.35 %. The use of copper and aluminum as fin material will also have the relatively same performance in the heat exchanger.
Numerical Study of Temperature and Air Velocity Distribution In Oil Filling Factory Hernawan Novianto; Prabowo Prabowo
JMES: The International Journal of Mechanical Engineering and Sciences Vol 1 No 2 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i2.2796

Abstract

This paper describes the use of CFD modeling to analyze the thermal comfort in the oil filling factory which has an area of 3000 m2. The need for this analysis comes from an uncomfortable condition that is felt by the workers of the factory. A 3D simulation using FLUENT software 6.3.26 conducted to analyze the temperature and velocity distribution in the plant room. The water is assumed as an incompressible ideal gas, steady flow, turbulence models used k−" standard, the SIMPLE algorithm and second order upwind discretisation. Analysis was conducted on existing models and propose models, whereby on a model propose, the diffuser is installed above the workers with a height of 4,2 m above the floor, the velocity of supply air diffuser is varied from 1,5 m/s, 2 m/s, and 2,5 m/s. The simulation results show that the temperature distribution in the existing conditions in the range of about 34-36 C, this value exceeds the thermal comfort standards specified by ASHRAE. The simulation results show that the proposed model better temperature distribution, where the temperature is generated in the range of ASHRAE thermal comfort criteria, ranging from 24-26 C, and the supply air velocity at the diffuser inlet of 1,5 m/s recommended for use in AHU system. For the 20 units of the diffuser with inlet velocity of 1,5 m/s, the mass flow rate that should be handled by a cooling device is 9 kg/s and require a cooling capacity of 0,128 MW. This is 58% more efficient than cooling the entire room factory.
Co-Authors Bambang Antoko Dany Iman Santoso Dicky Permana Djatmiko Ichsani Hernawan Novianto Mahadika Favian Alfandaviska