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All Journal Mechatronics, Electrical Power, and Vehicular Technology Rekayasa Mesin Journal of Engineering and Technological Sciences Indonesian Journal of Science and Technology Journal of Mechanical Engineering Science and Technology Mesin Jurnal Teknik Industri Terintegrasi (JUTIN)
Firman Bagja Juangsa
Faculty Of Mechanical And Aerospace Engineering, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Prediction of the remaining service lifetime of inflatable rubber dam with deep hole damage Budiman, Bentang Arief; Sambegoro, Poetro Lebdo; Rahardian, Samuel; Ilhamsyah, Rizky; Firmansyah, Ridha; Juangsa, Firman Bagja; Aziz, Muhammad
Indonesian Journal of Science and Technology Vol 5, No 3 (2020): IJOST: VOLUME 5, ISSUE 3, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i3.24936

Abstract

This paper exhibits a method to predict the remaining service lifetime of inflatable rubber dam by considering the appearance of deep hole damage. The material used for the rubber dam is a composite comprising three layers of woven fabric as fiber and EPDM/SBR 64 474 rubber as a matrix. The service lifetime is predicted by calculating the degradation of rubber dam’s material properties. Simple Rate Law model and Time-Temperature Superposition model are employed to calculate the rubber properties degradation. A finite element analysis is then conducted to investigate stress and strain distributions which occur in the rubber dam membrane during operational loading. Furthermore, the effect of deep hole damage in the rubber dam, which is caused by improper maintenance, is modeled as well. The results show that a 7 mm depth of the hole can accelerate rubber degradation, which causes catastrophic failure. This can happen because two layers of the woven fabric in the rubber dam have been broken. Suggestion to hold up the degradation is also discussed.
New Method of Materials Flow Calculation for Double-String SLCI Type Cement Plant (Part 1: The Whole Clinker Plant) Prihadi Setyo Darmanto; Izzan Hakim Muzakki; I Made Astina; Firman Bagja Juangsa; Alfi Amalia; Arief Syahlan
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (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.2021.53.5.6

Abstract

Materials flow values are instrumental in many industries for controlling and simulating processes, designing new equipment as well as modifying existing plants. They are sometimes impossible to determine by direct measurement in an operating plant due to the very high temperatures. This study attempted to overcome the difficulties associated with this measurement by proposing a new method to calculate materials flow of a double-string suspension preheater type of cement plant with separate line and in-line calciners (SLC-I), with heat balance error less than 1%. This study was divided into two sequential parts, with the first part presented in this paper. The methodology of the first part was to solve the conservation law of the main clinker plant equipment, supported by Bogue’s equation, the heat of calcination, and the thermodynamic properties of the related materials. The least-square method was employed for solving the overdetermined system equations obtained in the second part. The results of the first part were: the ratio of heat formation to specific heat consumption was 52.13% (> 50%), and the gas exhausted from the plant yielded more than 117 MW heat equivalent, which can potentially be recovered for electricity production.
New Method of Materials Flow Calculation for Double-String SLCI Type Cement Plant (Part 2: Suspension Preheater and Calciners) Prihadi Setyo Darmanto; Izzan Hakim Muzakki; I Made Astina; Firman Bagja Juangsa; Alfi Amalia; Arief Syahlan
Journal of Engineering and Technological Sciences Vol. 53 No. 6 (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.2021.53.6.1

Abstract

In many industries, energy auditing is important as the basis for controlling processes and designing additional equipment or modifying an existing plant. However, it requires detailed data of the materials flow, which often cannot be determined easily by direct measurement due to high-temperature limitations. This paper presents the second part of an integrated study to perform energy auditing in a separate line and in-line calciners (SLC-I) type cement plant. The second part of this study, as presented in this paper, focused on the materials flow calculation for eight separate cyclones and two calciners. The least square method was employed for solving the obtained overdetermined system equations. Using the operation data from Part 1 of the study, calculation of the detailed materials flow in each cyclone was executed. The results showed that the separation efficiency of cyclones 1A, 2A, 3A, 4A and 1B, 2B, 3B, 4B was 93.86%, 89.80%, 84.41%, 81.98% and 93.96%, 88.70%, 88.53%, 80.72% respectively and the estimated calcination percentage of kiln feed coming out of the ILC and the SLC was 85.3% and 56.3%, respectively. These values are impossible to be measured directly in the cyclones and calciners during plant operation.
Thermodynamic Study on Decarbonization of Combined Cycle Power Plant Azaria Haykal Ahmad; Prihadi Setyo Darmanto; Firman Bagja Juangsa
Journal of Engineering and Technological Sciences Vol. 55 No. 5 (2023)
Publisher : Directorate 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.2023.55.5.10

Abstract

Integrating hydrogen firing and a carbon capture plant (CCP) into a natural gas combined cycle (NGCC) power plant is a promising strategy for reducing CO2. In this study, process simulation in Aspen PLUS of hydrogen co-firing in a 40 MW turbine gas combined cycle power plant was done at an identical gas turbine inlet temperature from 0%.cal to 30%.cal. The evaluated cases were hydrogen co-firing with CCP (H2 Co-firing + CCP) and hydrogen co-firing without CCP (H2 Co-firing). The results showed a 6% CO2 emission reduction per 5% increase in hydrogen, albeit with increased NOx emissions. H2 Co-firing experienced a decrease in net power with rising hydrogen co-firing, while H2 Co-firing + CCP saw an increase but remained below Case 2 due to the energy penalty from the carbon capture plant. The capital cost of H2 Co-firing + CCP exceeds that of H2 Co-firing due to CCP usage, impacting gross revenue. The sensitivity analysis indicated that the cost of hydrogen has higher sensitivity compared to the cost of CCP. Lowering hydrogen prices is recommended to effectively reduce CO2 emissions in NGCC.
Estimating the dimensions of integrated calciner and carbonator for calcium looping process in a 7500 TPD capacity of cement plant Aulia, Tia; Prahmana, Rico Aditia; Darmanto, Prihadi Setyo; Juangsa, Firman Bagja; Ghita Ghaida Permatasari, Raden Dewi; Walad, Khoeril
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 15, No 2 (2024)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/j.mev.2024.1003

Abstract

The calciner in cement factories plays a crucial role, particularly in the decomposition of calcium carbonate (CaCO3) as primary raw materials into calcium oxide (CaO) and carbon dioxide (CO2), a significant contributor to greenhouse gas (GHG) emissions. Hence, an integrated system has been proposed, combining conventional cement plants with calcium looping (CaL) cycles to reduce CO2 emissions. CaL facilitates the capture of CO2 by CaO, forming CaCO3 as raw material for cement production. Given that CaL effectively reduces CO2 emissions, the integration process with conventional cement plants requires careful consideration, particularly regarding raw materials, calciners, and carbonators. Integration parameters for CaL in raw materials include average diameter and logarithmic temperature difference. At the same time, calciners and carbonators encompass heat transfer coefficient (U), calciner dimensions, carbonation factor, and mass balance post-integration with CaL. These parameters will be calculated to facilitate the integration of the CaL cycle with conventional cement plants. In this study, based on raw materials with an average diameter of 3.28 µm and the mean heat transfer coefficient between hot gas and raw materials of 4 W/m2 K, the calculated dimensions for the calciner are 9.6 m in diameter and 25 m in height. Since the plant studied has two preheater strings, two carbonator units are also required. The size of each carbonator is 4.75 m in diameter with a length of about 40 m, so it has a total volume approximately equal to the volume of the calciner to provide a longer residence time for particles.
Steam Supply Evaluation for Carbon Capture and Storage in a Subcritical Coal-Fired Power Plant Hendrayawan, Veri; Raksajati, Anggit; Adisasmito, Sanggono; Juangsa, Firman Bagja
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p291

Abstract

The aim of this study is to analyze the implementation of carbon capture and storage (CCS) in coal-fired power plants (CFPP) in Indonesia by determining the reboiler energy demand through steam source analysis. The study uses a representative 3×330 MW subcritical coal-fired power plant (CFPP), with an emission intensity of 1.02 tCO₂/MWh and flue gas CO₂ concentration of 13.8%. CCS modeling shows the reboiler requires about 2.9×10⁹ kJ/h energy, supplied by steam extracted from the plant’s steam cycle. A steam cycle model was developed to evaluate the impact of steam extraction. Potential tapping points analyzed include main steam, cold reheat, intermediate-pressure (IP) extraction, low-pressure to intermediate-pressure LP-IP crossover, and low-pressure (LP) extraction. Main steam extraction with the highest energy content needs the lowest steam mass flow of 355 t/h but causes the highest energy penalty of 57% because of lost electricity production in HP and IP extraction. Cold reheat extraction requires moderate steam flow of 399 t/h and a penalty of 52% but risks overheating reheater tubes. The LP-IP crossover point needs the highest steam flow 414 t/h, yet achieves the lowest net energy penalty at 33.8% with minimal operational risk, making it the most favorable option for CCS integration.
PURE PALM OIL SPRAY CHARACTERISTICS OF DIESEL FUEL INJECTOR Mamola, Randi; Nurcholik, Samsu Dlukha; Prahmana, Rico Aditia; Juangsa, Firman Bagja; Pratama, Raditya Hendra; Prihasto, Bima; Suardi, Suardi; Sa’adiyah, Devy Setiorini
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1981

Abstract

Diesel engines are widely used in many sectors due to their advantages of high energy density. To reduce emissions in diesel engines, a step that can be taken is to use renewable biofuel such as pure palm oil, which has a high viscosity and is difficult to get a fine atomization process in fuel spraying. However, a detailed analysis of the spray characteristics using pure palm oil fuel on conventional diesel engines has yet to be available. In this research, high-speed imaging was conducted to investigate the spray characteristics of pure palm oil compared to diesel fuel. The result shows that (1) at the start of the injection stage, both pure palm oil and diesel fuel have similar shapes, (2) the spray angle of pure palm oil is smaller due to orifice wall cavitation not occurring in the orifice, (3) and at the end of the injection stage, pure palm oil has larger droplets, which is also more difficult to atomize.
Analisis tekno ekonomi sistem hidrogen hijau dengan model matlab simulink di Lombok Indonesia Parman, Parman; Hendrasakti, Jooned; Juangsa, Firman Bagja
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 4 (2024): October
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i4.33553

Abstract

This research conducts a techno-economic analysis of a green hydrogen system in Lombok, Indonesia, using a MATLAB Simulink-based simulation model. The primary objective of this study is to evaluate the long-term economic feasibility of a green hydrogen project through the analysis of key financial parameters such as Net Present Value (NPV), Internal Rate of Return (IRR), and the break-even point. The model simulation results show that the production output of green hydrogen is 121,391 kg, and the project generates a Net Present Value (NPV) of $1,205,031.1 over a 25-year operational period. The Internal Rate of Return (IRR) of the project reaches 11.9%, indicating that the project has a promising profit potential. Additionally, the break-even point is achieved in the 8th year, meaning that the initial investment can be recouped by that time. These findings provide an initial overview of the economic prospects of green hydrogen development in Lombok and demonstrate the potential of green energy in supporting the energy transition in Indonesia. This study also offers guidance for policymakers and investors in making strategic decisions related to investments in renewable energy technology.
Multi-Objective Finned-Tube Heat Exchanger Optimization Using a Genetic Algorithm Suyatna, Nadiyah Rizki; Juangsa, Firman Bagja; Darmanto, Prihadi Setyo
Mesin Vol 29 No 2 (2023)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2023.29.2.4

Abstract

Heat exchangers are a significant component in many industries, particularly in energy conversion systems. The design of heat exchangers itself is a complex process because it involves experience-based decisions, numerous variables and parameters, and some of them are competing with each other. Genetic Algorithms (GAs) are one of the first evolutionary algorithms which remains one of the most extensively used non-linear optimization methods today. This study explores the implementation of Non-Dominated Sorting Genetic Algorithm II (NSGA-II) for thermal design and optimization of a finned-tube heat exchanger. The chosen objective functions were minimizing the heat exchanger volume and minimizing the air side pressure drop. The decision variables for the design were tube outer diameter, number of tube rows, fin pitch, unit height, and unit width. The calculated parameters and estimated cost of both preliminary design and optimized design were also compared. The optimized design offered a bigger alternative design while meeting all the constraints according to standards and industrial needs. The optimization reduced annualized operational and maintenance costs by 228% and lowered air pressure drop by 413% with bigger heat exchanger volume of 12% compared to the preliminary design.
Co-Authors Adisasmito, Sanggono Alfi Amalia Alfi Amalia Arief Syahlan Arief Syahlan Aulia, Tia Azaria Haykal Ahmad Bentang Arief Budiman Darmanto, Prihadi Setyo Devy Setiorini Sa’adiyah Firmansyah, Ridha Ghita Ghaida Permatasari, Raden Dewi Hendrasakti, Jooned Hendrayawan, Veri I Made Astina I Made Astina Ilhamsyah, Rizky Izzan Hakim Muzakki Izzan Hakim Muzakki Mamola, Randi Muhammad Aziz parman parman Prahmana, Rico Aditia Pratama, Raditya Hendra Prihadi Setyo Darmanto Prihadi Setyo Darmanto Prihadi Setyo Darmanto Prihasto, Bima Rahardian, Samuel Raksajati, Anggit Sambegoro, Poetro Lebdo Samsu Dlukha N Suardi Suardi Suyatna, Nadiyah Rizki Walad, Khoeril