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All Journal Jurnal Teknik Mesin Indonesia Prosiding SNTTM Scientific Contributions Oil and Gas
Hakim, Imansyah Ibnu
Department Of Mechanical Engineering, Faculty Of Engineering Universitas Indonesia Kampus UI Depok 16424 Jawa Barat
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Performance of solar dish stirling engine for remote area needs Imansyah Ibnu Hakim; Hafizh Bramantya Rizaldi Putra
Jurnal Teknik Mesin Indonesia Vol. 18 No. 1 (2023): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v18i1.427

Abstract

The need for electricity is the main need of the Indonesian people, and everyone. In 2020, there are 433 villages without electricity in Indonesia. Indonesia has great potential as a source of renewable energy. According to the Ministry of Energy and Mineral Resources, Indonesia's total renewable energy potential is 417.8 gigawatts (GW). The greatest potential comes from the sun at 207.8 GW. One way to utilize the potential of solar energy is to use the Solar Dish Stirling Engine. This research uses an alpha stirling engine and uses air as the working fluid. This initial research of the solar dish Stirling engine aims to determine engine performance with parameters such as engine rotation speed, Stirling engine output power, and Stirling engine output power efficiency. The experiment was carried out using four variations of the piston arm length, namely 5 cm – 5 cm (LH-LC), 5 cm – 4.3 cm (LH-LC), 4.3 cm – 5 cm (LH-LC) and 4.3 cm – 4.3 cm (LH-LC), and used a 500 Watt halogen lamp as a substitute for the solar heat source. From the results of the study, the maximum rpm speed was obtained at 852 rpm with an arm length of 5 cm – 5 cm (LH-LC). The results of the study also showed that optimum engine rotation speed was found in the length of the arm 5 cm – 5 cm (LH-LC) with a value of 0.39 W at 839 rpm. Finally, it is known that the largest stirling engine efficiency is 6.5% at arm length 5 cm – 5 cm (LH-LC).
CHARACTERIZATION OF THERMAL PRECIPITATOR IN SMOKE COLLECTOR BY USING PARTICLE COUNTER Imansyah Ibnu Hakim; Bambang Suryawan; I Made Kartika D; Nandy Putra; Cahyo Setyo Wibowo
Scientific Contributions Oil and Gas Vol 35 No 1 (2012)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.35.1.641

Abstract

Air pollution in major cities in many countries has reaching a very concerning level. One of thecause of air pollution is pollution caused by smoke aerosol. Smoke aerosols that has an averageparticle diameter of 0.1 μm – 1 μm can be found in cigarette smoke, diesel vehicle fume, industrialfume and many else. This condition will be worsen by the increase in the number of smokers, motorvehicles and industry. Therefore we need to pursue the control method for that kind of air pollution.In the literature study, it’s found that the cleaning method of air fi ltration for fi ne particle withdimension of 0.01 – 5 μm are by using thermal precipitator. Thermal precipitator is one method ofair fi ltration based on thermophoretic force, which is if there is a temperature difference betweentwo plates, it will cause the force that will push the particles between the two plates toward theplate that has lower temperature. In the effort to help control and reduce the air pollution, for thisstudy we made a thermal precipitator test equipment to deposit the particles in the air with the useof thermophoretic force. That force is the force applied to the particles that suspended in the fl uidfl ow. The temperature difference between two plates is set at ΔT=5, 10, 15, and 20oC. This studyutilized gas sensors to observe the characterization of thermal precipitator. From the experimentand analysis can be concluded that thermal precipitator can be applied as a smoke collector.
Techno-economic analysis of waste heat recovery on the organic Rankine cycle: A case study at Gunungsitoli gas engine power plant Imansyah Ibnu Hakim
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/t6ewq657

Abstract

The organic Rankine cycle (ORC) is a technology that can utilize waste heat potential from various sources, including isolated power plants such as gas turbine power plants (PLTMG).  The Gunungsitoli Nias PLTMG has a significant opportunity to utilize its waste heat, which is at a temperature of 270°C, through the implementation of an ORC system.  A techno-economic analysis is necessary to assess the viability of implementing this concept. In this study, the optimal pressure, mass flow, and temperature parameters for achieving the highest net power were investigated.  The ORC simulations were conducted using the Aspen HYSYS software to evaluate its performance.   There are three variations of test cases: Single ORC (SORC) with R134a, SORC with R245fa, and Dual ORC (DORC) with a dual cycle of R245fa/R134a.  An economic analysis was conducted using three methods to assess the feasibility of implementing ORC technology at the PLTMG. The analysis included the Payback Period (PBP), Internal Rate of Return (IRR), Net Present Value (NPV), and Levelized Cost of Energy (LCOE) metrics. The results of the study indicate that the DORC R245fa/R134a system produces the highest net power output with operating parameters of pressure 14/12 Bar, mass flow 0.6/1.1 kg/s, and temperature 154/49 °C, yielding an ORC-R245fa/R134a result of 5,727 Watts/1.703% for the heat source from one unit PLTMGs and 28,595 Watts/1.70% for the heat source from 5 units PLTMG, which is higher than the SORC configuration for each fluid R245fa and R134a. The configuration becomes economically viable when the isentropic efficiency of the expander and pump is changed to 75% and 80%, respectively, and the mechanical efficiency is changed to 95%. The SORC-R245fa configuration yields the most economically advantageous configuration with an IRR of 10.09%, 355.45 million (NPV), 12 years (PP), and 966.54 Rp/kWh (LCOE) for the flue gas source from one units PLTMG, as well as 15.36% (IRR), 2,839.96 million (NPV), 8 years (PP), and 702.52 Rp/kWh (LCOE) for flue gas sources from five units PLTMG.  
A Compact oxygen concentrator for premature infants: Integrating portability and performance in the third-generation prototype Cornelia Christiani Vianney; Raldi Artono Koestoer; Yudan Whulanza; Imansyah Ibnu Hakim
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/zs2cbg95

Abstract

Oxygen concentrators are vital devices in medical oxygen therapy. It provides supplemental oxygen, extracted from the environmental air, to patients suffering from hypoxemia or other clinical conditions characterized by low blood oxygen saturation. The need for oxygen therapy extends across various patient populations, including adults, children, and neonates, especially premature infants. However, commercially available concentrators are usually designed for adults, making them unsuitable for premature infants whose delicate, underdeveloped organs can be harmed by high oxygen levels. Meanwhile, field observations from the Indonesian Incubator Team indicate frequent demand for supplemental oxygen following hospital discharge. To meet the urgent need for a suitable device, especially for premature infants discharged from hospitals, this study describes the design and development of a compact, portable, and neonatal-specific oxygen concentrator. A reverse engineering approach was adopted through a three-phase prototyping process. The first prototype verified the feasibility of the pressure swing adsorption (PSA) principle as the main process of the oxygen concentrator. The second prototype integrated a complete system to evaluate performance by measuring flow rate and oxygen concentration and adjusting components to achieve optimal results. The final, third prototype refined the design to improve compactness and portability. The device achieved an oxygen concentration of about 40% oxygen purity with a steady flow rate of 2 L/min. This developed oxygen concentrator presents a significant step forward in neonatal care, providing a tailored and accessible solution that can support widespread use in home-based infant healthcare programs.
Co-Authors Bambang Suryawan Bambang Suryawan Bambang Suryawan, Bambang Cahyo Setyo Wibowo Cahyo Setyo Wibowo Cornelia Christiani Vianney Hafizh Bramantya Rizaldi Putra I Made Kartika D I Made Kartika D Kartika D, I Made Nandy Putra Putra, Nandy Setiadi Djaya RA. Koestoer Wibowo, Cahyo Setyo Yudan Whulanza