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All Journal Jurnal Forum Nuklir Mesin Jurnal Konversi Energi dan Manufaktur Makara Journal of Technology
Engkos Achmad Kosasih
Departement Of Mechanical Engineering, Faculty Of Engineering, University Of Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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SIMULASI PEMBANGKIT LISTRIK TENAGA GAS DAN UAP TANJUNG PRIUK Kosasih, Engkos Achmad; Suwono, Aryad
Mesin Vol 12, No 1 (1997)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (555.781 KB)

Abstract

Pencocokan setiap komponen PLTGU bisa dilakukan dengan sualu program simulasi. Pada penelitian ini, simulasi keadaan tunak dibuat untuk PLTGU Tanjung Priuk dengan beberapa penyederhanaan. Tiap blok PLTGU tersebut terdiri dari 3 buah siklus gas dan 1 buah siklus uap dengan 3 buah HRSG. Data yang diambil dari ruang kontrol diolah untuk mendapatkan persamaan karakteristik garis operasi dari setiap komponen. Selanjutnya program simulasi dibuat berdasarkan persamaan-persamaan tersebut bersama-sama dengan persamaan persamaan ?sik lainnya sehingga terbentuk sistem persamaan simultan 47 persamaan dengan 47 variabel. Program simulasi ternyata bisa mencapai nilai konvergen untuk berbagai input beban (daya total) serta menunjukkan kecenderungan yang sama dengan data ruang kontrol, khususnya dalam hal e?siensi siklus kotor (bruto).
ANALYSIS OF HEAT AND MASS TRANSFER ON COOLING TOWER FILL Abdul Aziz Rohman Hakim; Engkos Achmad Kosasih
Jurnal Forum Nuklir JURNAL FORUM NUKLIR VOL 14 NO 1 MEI 2020
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.918 KB) | DOI: 10.17146/jfn.2020.14.1.5812

Abstract

This paper discusses heat and mass transfer in cooling tower fill. In this research, dry bulb temperature at the bottom fill, ambient relative humidity, air stream velocity entering fill, dry bulb temperature leaving the fill, relative humidity of air leaving the fill, inlet and outlet water temperature of cooling tower were measured. Those data used in heat and mass transfer calculation in cooling tower fill. Then, do the heat and mass transfer calculation based on proposed approch. The results are compared with design data. The design and analogy method showed different  result. The parameter which influence the heat transfer at cooling tower are represented by coefficient of heat transfer hl and coefficient of mass transfer k­l. The differencies result between design and analogy method shows that there is important parameter which different. Deeply study needed for it.
SIMULASI PEMBANGKIT LISTRIK TENAGA GAS DAN UAP TANJUNG PRIUK Engkos Achmad Kosasih; Aryad Suwono
Mesin Vol. 12 No. 1 (1997)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pencocokan setiap komponen PLTGU bisa dilakukan dengan sualu program simulasi. Pada penelitian ini, simulasi keadaan tunak dibuat untuk PLTGU Tanjung Priuk dengan beberapa penyederhanaan. Tiap blok PLTGU tersebut terdiri dari 3 buah siklus gas dan 1 buah siklus uap dengan 3 buah HRSG. Data yang diambil dari ruang kontrol diolah untuk mendapatkan persamaan karakteristik garis operasi dari setiap komponen. Selanjutnya program simulasi dibuat berdasarkan persamaan-persamaan tersebut bersama-sama dengan persamaan persamaan fisik lainnya sehingga terbentuk sistem persamaan simultan 47 persamaan dengan 47 variabel. Program simulasi ternyata bisa mencapai nilai konvergen untuk berbagai input beban (daya total) serta menunjukkan kecenderungan yang sama dengan data ruang kontrol, khususnya dalam hal efisiensi siklus kotor (bruto).
Modification of Flow Structure Over a Van Model By Suction Flow Control to Reduce Aerodynamics Drag Harinaldi, Harinaldi; Budiarso, Budiarso; Warjito, Warjito; Kosasih, Engkos Achmad; Tarakka, Rustan; Simanungkalit, Sabar Pangihutan; Lay Teryanto, I Gusti Made Fredy
Makara Journal of Technology Vol. 16, No. 1
Publisher : UI Scholars Hub

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Abstract

Automobile aerodynamic studies are typically undertaken to improve safety and increase fuel efficiency as well as to find new innovation in automobile technology to deal with the problem of energy crisis and global warming. Some car companies have the objective to develop control solutions that enable to reduce the aerodynamic drag of vehicle and significant modification progress is still possible by reducing the mass, rolling friction or aerodynamic drag. Some flow control method provides the possibility to modify the flow separation to reduce the development of the swirling structures around the vehicle. In this study, a family van is modeled with a modified form of Ahmed's body by changing the orientation of the flow from its original form (modified/reversed Ahmed body). This model is equipped with a suction on the rear side to comprehensively examine the pressure field modifications that occur. The investigation combines computational and experimental work. Computational approach used a commercial software with standard kepsilon flow turbulence model, and the objectives was to determine the characteristics of the flow field and aerodynamic drag reduction that occurred in the test model. Experimental approach used load cell in order to validate the aerodynamic drag reduction obtained by computational approach. The results show that the application of a suction in the rear part of the van model give the effect of reducing the wake and the vortex formation. Futhermore, aerodynamic drag reduction close to 13.86% for the computational approach and 16.32% for the experimental have been obtained.
Heat Pump Drying of Arabica Coffee Beans: Influence of Inlet Air Conditions on Drying Rate Constant Hanifah, Muhamad Abu; Kosasih, Engkos Achmad; Fauzi, Muhammad Burhanuddin
Jurnal Konversi Energi dan Manufaktur Vol. 10 No. 2 (2025)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.10.2.5

Abstract

Drying is a crucial step in agricultural processing as it reduces moisture content, extends shelf life, and preserves product quality. For heat-sensitive Arabica coffee beans, heat pump drying (HPD) is an efficient and energy-saving method. This study investigates the drying characteristics of wet Arabica coffee beans using an HPD system, focusing on determining the drying rate constant (k) at various inlet air temperatures and humidity conditions. The drying process was conducted for 30 minutes at a constant air mass flux rate of 0.69 kg/m²-s at temperatures of 45, 50, 55, 60, and 65°C. Inlet air conditions were controlled with a cooling system at 10, 15, and 20°C, compared to ambient air without cooling. The results showed that increasing drying temperature and decreasing inlet air humidity significantly enhanced the drying rate. Additionally, the study explored the relationship between the constant air mass flux and variable parameters, including air temperature and humidity, which directly affected the drying rate constant (k). The highest k value (17.66 × 10⁻⁵ s⁻¹) was observed at 65°C with air from the cooling system at 10°C, indicating that combining high temperature and dry air improves drying efficiency.
Co-Authors Abdul Aziz Rohman Hakim Aryad Suwono Budiarso Budiarso, Budiarso Fauzi, Muhammad Burhanuddin Hanifah, Muhamad Abu Harinaldi . Lay Teryanto, I Gusti Made Fredy Rustan Tarakka Sabar Pangihutan Simanungkalit Suwono, Aryad Warjito Warjito, Warjito