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Jaka Fajar Fatriansyah
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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
Core Subject :
JMEF publishes publications that report on R&D discoveries and fundamental understanding of phenomena with potential significance, as well as those that explore solutions to current engineering challenges in materials and mechanical engineering or related fields. JMEF includes original research, review and short communication articles. JMEF welcomes original articles on all aspects of materials science/engineering and mechanical engineering, including: 1. Materials synthesis, processing and manufacturing; 2. Advanced Materials; 3. Extraction metallurgy; 4. Physics of Materials; 5. Computational studies on Materials and Mechanical Engineering; 6. Fluid Dynamics and Heat Transfer; 7. Management Integrity and Reliability Engineering; 8. Mechanical systems; and related fields.
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Articles 6 Documents
 1 
Search results for , issue "vol. 5, no. 1" : 6 Documents clear
Techno-Economic Analysis of Hybrid Systems as a Solution for Electricity Supply during the Dry Season at the Bakaru Run-of-River Hydropower Plant Febri, Zamharir Aditya; Indianto, Mohammad Akita; Tobing, Sheila
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

Within the South Sulawesi power system (Sulbagsel), the Bakaru Hydro Power Plant serves as a key facility expected to provide consistent and reliable electricity supply. However, since the Bakaru plant operates under a Run of River scheme, its energy output is highly dependent on river discharge rates. In 2024, a significant decrease in water flow was recorded between August and October, which led to a drastic reduction in power generation. To address this challenge, a hybrid energy system is proposed to ensure continuous load coverage, particularly during the dry season. The optimal configuration of this hybrid system was modeled and simulated using HOMER Pro software. The simulation results indicate that a combination of the existing Bakaru Hydro Power Plant 126 MW, Solar PV 100 MWp, BESS of 24 MWh, and a steam-gas power plant 80 MW can effectively fulfill the annual electricity demand. The proposed hybrid system yields a total annual energy output of 862,719.29 MWh, which exceeds the actual load demand by 33.6% (equivalent to 290,164.45 MWh). This energy surplus can be strategically allocated to accommodate seasonal loads or projected demand growth. From an economic standpoint, the configuration demonstrates a Net Present Cost (NPC) of USD 934 million, with Levelized Cost of Electrictricity (LCOE) of USD 0.0583 per kWh. Furthermore, the project displays promising investment viability, achieving an Internal Rate of Return (IRR) of 31.57% and a payback period of four years and a projected Net Present Value (NPV) of USD 715,487,322.
Techno-Enviro-Economic Analysis of Precipitated Calcium Carbonate Production from Carbon Dioxide in Cement Industry Flue Gas and Calcium Hydroxide Panggabean, Natalia Debora; Purwanto, Widodo Wahyu
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

CCUS is a technological solution to reduce emissions from the cement industry, which is the second largest CO2-intensive industry. This study aims to analyze technical, economic, and environmental performance of Precipitated Calcium Carbonate (PCC) synthesis in cement industry flue gas. The process simulation includes the CO2 capture system from cement plant, CO2 captured used as feedstock for PCC synthesis process through its reaction with calcium hydroxide. The simulation was carried out using ASPEN Plus software. Technical analysis was performed to determine the CO2 capture efficiency and PCC synthesis efficiency. Economic analysis was conducted to calculate CO2 capture cost and production cost of PCC based on Levelized Cost of Chemical (LCOC)). Environmental analysis was carried out with gate- to-gate scope to quantify the amount of CO2 converted per unit of PCC produced and to assess the CO2 abatement potential. The study shows that a cement plant with a production capacity of 3,000 tons of clinker per day can capture 4,542 kg/h of CO2 with a purity of 98.3% and a capture efficiency of 99.5%. Estimated CO2 capture cost was USD 65 per ton of CO2. PCC produced amounted to 8,196 kg/h with a carbonation efficiency of 80.01%, and the LCOC was USD 254 per ton of CaCO3. Overall, the process was able to reduce emissions by 0.435 tons of CO2 per ton of CaCO3 produced, with a CO2 avoidance cost of USD 92.85 per ton of CO2.
Assessing Passenger Electric Vehicle Growth Strategies and Their Impacts on Electricity Demand Load and CO2 Emissions in Aceh Province to Achieve Net Zero Emission Target by 2060 Hidayat, Taufik; Purwanto, Widodo Wahyu
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

The electrification of the transport sector is a crucial pathway for achieving Indonesia’s Net Zero Emissions (NZE) target by 2060. This study assesses the potential impact of passenger electric vehicle (EV) penetration on electricity demand and CO2 emissions in Aceh Province through a scenario-based modelling approach. Two policy-aligned scenarios are assessed: a low-penetration (LP) scenario and a high-penetration (HP) scenario. Using the Gompertz model and the ASIF framework, total CO2 emissions were projected from 2020 to 2060. Results show that although higher EV penetration reduces direct emissions from internal combustion engine (ICE) vehicles, total CO2 emissions increase more significantly under LP scenario, reaching over 8.1 million tons by 2060, compared to 4.7 million tons in HP scenario. The increase in electricity demand resulting from EV adoption, if met by fossil-based power, can offset the environmental benefits. Thus, EV deployment must be aligned with power sector decarbonization through the adoption of renewable energy sources, grid upgrades, and clean charging infrastructure. Integrated transport-energy planning is vital to ensure that EVs support Indonesia’s NZE targets, particularly in regions like Aceh, which has untapped renewable potential.
Feasibility Analysis of Thermal Oxidizer to Determine Remaining Life Using Fitness- for-Service Level 3 Method Yudistirawan, Yudhi; Dhaneswara, Donanta; Putra, Wahyuaji Narottama; Widyaputra, Gama; Suci, Dewi Kurnia; Mahardhika, Agung Putra
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

An aged thermal oxidizer (TOX) in the oil and gas industry necessitates a comprehensive evaluation to ensure its continued safe operation. This study presents a Remaining Life Assessment (RLA) and a Fitness for Service (FFS) evaluation for the four main components of the TOX, in accordance with API 510, API 579/ASME FFS-1, and ASME BPVC Section VIII Div-1 standards. The investigation includes the determination of maximum stress and maximum temperature required to assess the operational viability of the reactor. The four components are radiant, convection, transition, and stack sections—were modeled using the finite element method (FEM). Following the geometric modeling, an FFS evaluation was conducted based on two criteria: stress and temperature, to ascertain whether the TOX remains safe and operational until the end of its service life. Based on the FFS assessment, the TOX structure has been deemed fit to operate and acceptable for use throughout its remaining service life. Subsequently, a remaining life assessment performed on these components indicated an estimated service life of 20 years. According to the analyses carried out, the maximum stress observed is 160 MPa in the radiant section, while the highest temperature, recorded at 392 °C, occurs in the convection and transition sections. These results indicate that the radiant area particularly the upper radiant component, poses the highest risk due to the stress concentrations at its peak levels. In conclusion, although the TOX system is currently operating safely, periodic inspections are essential to ensure its continued secure operation until the end of its remaining service life.
Risk Identification of Green Hydrogen Supply Chain in Ammonia Industry in Indonesia using Delphi and TOPSIS Methods Priatama, Ananda; Tobing, Sheila
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

The development of green hydrogen in Indonesia, while promising for supporting industrial decarbonization, remains in its early stages and faces various challenges across technical, economic, and regulatory domains. This study aims to identify and prioritize the risks linked to green hydrogen supply chain in Indonesia, particularly for applications in the ammonia industry. A set of 49 potential risk factors was initially compiled through literature review and prior studies. The Delphi method was employed with a panel of experts to validate these risks, ultimately refining the list to 27 critical risk factors. Subsequently, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method was used to quantify and rank these risks based on expert assessments of likelihood and impact. The results indicate that the most significant risks include improper location of facilities, policy and regulation development, access to funding and financial constraints, climate change and renewable energy availability, and political instability. Compared to previous studies in developed countries where technological and infrastructure risks dominate, this study highlights the prominence of policy and governance-related risks in Indonesia. The findings provide critical insights for stakeholders to design targeted mitigation strategies and prioritize actions that will foster a more resilient and investable green hydrogen ecosystem for ammonia industry in the country.
A Sustainable Approach to Tensile Property Enhancement in Sand Casting Via Metal Chip–Sand Composite Molds Isyaku, Maaruf; Yawas, Danjuma Saleh; Afolayan, Mathew Olatunde; Ause, Terva
Journal of Materials Exploration and Findings Vol. 5, No. 1
Publisher : UI Scholars Hub

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Abstract

The present work focuses on the study of the effect of adding different weight percentages and particle sizes of various metal chips to foundry sand on the tensile strength of aluminum alloy castings, utilizing Taguchi's optimization methodology and regression analysis. Characterization techniques such as X-ray fluorescence (XRF), thermogravimetry, and SEM were also used. The XRF analysis identified aluminum (76.61%), silicon (17.49%), and magnesium (1.28%) as the major elements in the aluminum alloy engine block. For the foundry sand, silicon (89.51%), phosphorus (7.41%), and potassium (1.7%) were found. In contrast, the major constituents in cast iron included iron (88.3%), carbon (3.7%), and silicon (2.3%), while brass comprised primarily copper (64%), zinc (23%), and iron (3.2%). Altered composition of the molding sand improved the tensile strength by 61.05%. The optimization results show an improvement of 64.21% in the tensile strength. Thermogravimetric examination also revealed a 14.59% improvement in the thermal stability.The developed regression model for predicting tensile strength demonstrated a robust fit, with R-square values of 95.57% (R2), 93.35% (adjusted R2), and 87.64% (predicted R2). Testing of foundry attributes also showed that using brass chips with foundry sand made a significant impact, increasing the green and dry compressive strengths by 16% and 18%, respectively, and the compactability by 7% compared to the control sample. In general, the results support the idea that improving the composition of metal chips has a favourable effect on the strength, thermal, and structural properties, which in turn makes aluminum alloy castings work more effectively.

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