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All Journal Mechatronics, Electrical Power, and Vehicular Technology Journal of Engineering and Technological Sciences Mesin Teknologi Indonesia
Ari Darmawan Pasek
Thermodynamics Laboratory, Faculty of Mechanical and Aerospace Engineering – Institute Technology Bandung
Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering

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Feasibility of Recovering Energy from Municipal Solid Waste to Generate Electricity Pasek, Ari Darmawan; Gultom, Kilbergen W.; Suwono, Aryadi
Journal of Engineering and Technological Sciences Vol 45, No 3 (2013)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.272 KB) | DOI: 10.5614/j.eng.technol.sci.2013.45.3.3

Abstract

Population growth and economic development in Indonesia have increased the production of municipal solid waste (MSW) in many big cities, causing sanitary problems. The (MSW) disposal problem can be solved by applying an appropriate technology that can reduce the volume of the waste effectively and efficiently. Waste-to-Energy (WTE), or Energy-from-Waste (EFW), is one of the most effective and efficient technologies for reducing the waste volume. Energy recovered from the waste can be used for thermal or electricity generation. This paper deals with a feasibility study of utilizing MSW for generating electricity. A survey and investigation of waste characteristics, including waste composition, chemical and physical composition, and heating value, were carried out for typical Bandung MSW. An average heating value of 1500 kcal/kg can be expected from pre-treated MSW to be used as a fuel for direct combustion in a WTE plant. A typical design for a small-scale WTE plant is shown in this paper and also an energy analysis is provided. Approximately 800 kW of electric power can be generated from 50 tonnes of MSW per day.
PERBANDINGAN PERSAMAAN KOEFISIEN PERPINDAHAN KALOR KESELURUHAN UNTUK PERANCANGAN PENUKAR KALOR Indartono, Yuli Setyo; Pasek, Ari Darmawan
Mesin Vol 11, No 2 (1996)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (258.967 KB)

Abstract

This paper concerns with comparison of various heat transfer equations which can be used in the design of a shell and tube heat exchanger for combustion gas and air. A computer programme which also includes the thermodynamics properties of the gas and air was made for that purpose. Characteristics of the heat exchangers are then compared with the existing industrial heatexchanger. It was found that the overall heat transfer coefficient equation proposed by Babcock & Wilcock gives the best results .
ANALISIS DINAMIKA STRUKTUR PADA SISTEM FLEKSIBEL DI ANTARIKSA Pasek, Ari Darmawan
Mesin Vol 9, No 1&2 (1990)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (406.9 KB)

Abstract

Berdasarkan data-data penelitian sebelumnya, dalam makalah ini akan dibahas model pendidihan dan mekanisme perpindahan panasnya pada permukaan berpori dalam cairan refrijeran. Ditunjang dengan suatu kajian analitik, diusulkan tiga model pendidihan yang terjadi pada tiga daerah fluks panas yang berbeda. Pada fluks panas rendah terjadi pendidihan pada dasar permukaan berpori dan pada fluks panas tinggi terjadi pendidihan pada permukaan. Sedangkan model pendidihan yang ketiga adalah pendidihan antara yang terjadi pada daerah transisi antara daerah fluks panas rendah dan tinggi. Pada makalah ini akan dibahas pula suatu metoda dan persamaan korelasi untuk memperkirakan koefisien perpindahan panas pada setiap daerah pendidihan.
PENGARUH ETANA PADA REFRIGERAN HIDROKARBON Abidin, Zainal; Pasek, Ari Darmawan; Abdurrachim, Abdurrachim
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Hydrocarbon refrigerant is one kind of refrigerants, which is developed to substitute CFC and HCFC. The substances contained in hydrocarbon refrigerant are etane, propane, normal butane, and iso butane. Ethane is being suspected on reducing the performance of refrigerator. This paper deals with theoretical study of ethane influence in hydrocarbon refrigerant. First of all it is necessary to create software for evaluating thermodynamics properties. This software has many choices for prescribed thermodynamics properties. According to the analysis, it is known that the more ethane content in HCR-12, the more deviation of saturated pressure-temperature curves between HCR-12 and R-12. While in HCR-22 when the pressure is less that 4 bar, it is known that the more ethane content, the more deviation of saturated pressure-temperature curve between HCR-22 and R-22. However, if the pressure is above 4 bars, it is known that the more ethane, the saturated pressure-temperature curve is close to the one of HCR-22 with 4% ethane content. On performance test of standard refrigeration system using the refrigerant, it is known that the more ethane content in HCR-12 and HCR-22, COP of the system decreases gradually. The average temperature in evaporator and condensor also declines.
PENGEMBANGAN PERSAMAAN KORELASI PENDIDHAN KOLAM UNTUK REFRIGERAN HIDROKARBON Pasek, Ari Darmawan; Adriansyah, Willy; Hery, Hery; Leo, Hengky
Mesin Vol 23, No 2 (2008)
Publisher : Mesin

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Abstract

Hydrocarbons (HC) are considered as the alterative substitutes of CFC and HCFC refrigerants. Using it as new refrigerants needs a complete knowledge of its characteristics. One of them is the boiling heat transfer coefficient. Series of experiments were carried out to investigate this characteristics. Experiments had been carried out with R-12 (CFC) and R-22 (HCFC) and their substitutes, HC-12 and HC-22. Tested refrigerant was conditiond at a saturated state and an electric heater immersed in the refrigerant pool of liquid was used as the boiling surface. Boiling heat transfer coefficient is determined as the ratio between the heat flux and the excess temperature on the boiling surface. The experimental results were compared between R-12 and R-22 with their substitutes. The experimental results were compared with the correlation equations proposed by researchers. Based on the analysis results, modified correlation equations are proposed for the tested refrigerants.
KARAKTERISTIK PERPINDAHAN PANAS PADA PENDINGINAN MODEL SUNGKUP REAKTOR AP1000 DENGAN UDARA YANG BERSIRKULASI ALAMIAH Hermawan, Nanang Triagung Edi; Pasek, Ari Darmawan; Umar, Efrizon
Teknologi Indonesia Vol 34 (2011)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v34iKhusus.40

Abstract

Electric energy demand always grows up. Nuclear energy is one of energies alternative in the future. AP1000 is III+ generation reactor that will possibly built in Indonesia. One of the safety AP1000s features is containment cooling system by natural circulation of air. Experimental study on heat transfer characteristic in containment surface of AP1000 model was done in laboratory scale. From these research, it knows that critical heat fl ux happened at power 2010 watt or 553,47 watt per meter square heat fl ux. Empirical correlation from these research is Nux = 7,086. Rax*0,1906; 2,09 x 106 < Rax* < 1,24 x 1012 for cylindrical concentric part and Nux = 1,308. Rax*0,2527; 7,51 x 105 < Rax* < 7,08 x 1010 for ellipse sector.
Geometry Analysis and Effect of Turbulence Model on the Radial Rotor Turbo-Expander Design for Small Organic Rankine Cycle System Arifin, Maulana; Pasek, Ari Darmawan; Eddy, Zaidan
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 6, No 1 (2015)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2799.709 KB) | DOI: 10.14203/j.mev.2015.v6.39-48

Abstract

Organic Rankine Cycle (ORC) is one of the most promising technology for small electric power generations. The geometry analysis and the effect of turbulence model on the radial turbo-expanders design for small ORC power generation systems were discussed in this paper. The rotor blades and performance were calculated using several working fluids such as R134a, R143a, R245fa, n-Pentane, and R123. Subsequently, a numerical study was carried out in the fluid flow area with R134a and R123 as the working fluids. Analyses were performed using Computational Fluid Dynamics (CFD) ANSYS Multiphysics on two real gas models, with the k-epsilon and SST (shear stress transport) turbulence models. The result shows the distribution of Mach number, pressure, velocity and temperature along the rotor blade of the radial turbo-expanders and estimation of performance at various operating conditions. The operating conditions are as follow: 250,000 grid mesh flow area, real gas model SST at steady state condition, 0.4 kg/s of mass flow rate, 15,000 rpm rotor speed, 5 bar inlet pressure, and 373K inlet temperature. By using those conditions, CFD analysis shows that the turbo-expander able to produce 6.7 kW and 5.5 kW of power when using R134a and R123, respectively.
Co-Authors Abdurrachim Abdurrachim Adriansyah, Willy Aryadi Suwono Efrizon Umar Hery Hery Indartono, Yuli Setyo Kilbergen W. Gultom Leo, Hengky Maulana Arifin Nanang Triagung Edi Hermawan, Nanang Triagung Edi Zaidan Eddy Zainal Abidin