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All Journal Jurnal Edukasi Elektro Jurnal Pendidikan Teknologi dan Kejuruan ELKHA : Jurnal Teknik Elektro Jurnal Pengembangan Energi Nuklir TELKOMNIKA (Telecommunication Computing Electronics and Control) Prosiding Semnastek Jurnal IPTEK ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Syntax Literate: Jurnal Ilmiah Indonesia Energi & Kelistrikan Jurnal Ilmiah Sutet Jurnal Teknik Jurnal Teknik Elektro dan Komputasi (ELKOM) Indonesian Journal of Electrical Engineering and Computer Science International Journal of Computer and Information System (IJCIS) Automotive Experiences CITIZEN: Jurnal Ilmiah Mulitidisiplin Indonesia Andalas Journal of Electrical and Electronic Engineering Technology Journal of Social Science Journal of Advanced Technology and Multidiscipline (JATM) International Journal of Engineering Continuity Journal of Business, Social and Technology Eduvest - Journal of Universal Studies Jurnal Ekonomi, Teknologi dan Bisnis Leuser Journal of Environmental Studies International Journal of Electrical, Computer, and Biomedical Engineering (IJECBE) International Journal of Renewable Energy Development
Iwa Garniwa
Department Of Electrical Engineering, Faculty Of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Social Sciences Other

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Engineering and economic analysis of sawdust biomass processing as a co-firing fuel in coal-fired power plant boiler pulverized coal type Efendi, Juwani; Garniwa, Iwa
Jurnal Pendidikan Teknologi Kejuruan Vol 5 No 3 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v5i3.27723

Abstract

One type of alternative fuel that has the potential to be developed and can contribute significantly to the NRE mix is biomass. The significance of the energy mix is obtained from the use of the co-firing system at the Coal-Fired Power Plant (CFPP) by mixing coal fuel with biomass such as sawdust. Sawdust biomass as cofiring material for CFPP is very efficient because it has energy content and availability that is easy to manage. The aim of this research is to make technical and economic analysis of sawdust biomass as solid fuel for pulverized coal CFPP Co-firing type boiler. The research stages are mapping the potential of sawdust biomass to determine the availability of potential biomass around the location of the co-firing, analyze the technical side and specifications contained in sawdust biomass raw materials to determine the suitability or feasibility of pulverized coal type CFPP specifications, and analyze the economic feasibility of developing sawdust biomass processing technology to determine the cost of production of sawdust biomass so that later it will not have a technical and financial impact. The results of the economic analysis show that the sawdust biomass production business is feasible with NPV parameters > IDR 5,252,097,371, IRR=11.1% and payback period=7.7 years. Provided that if the PLTU Rembang buys biomass at a price of Rp. 862,730/Ton. Sensitivity analysis is used to determine the steps to optimize the adjustment of the ability to purchase biomass from CFPP Rembang where the reference limit for the highest reference price for biomass is IDR 782,006. Efforts that can be made to adjust the ability to purchase biomass from the CFPP Rembang include increasing the yield by 20% or reducing the price of wood by 20%.
Analysis of ICONNET fiber optic network improvement in cluster rayon panam at strategic business unit central sumatra PT PLN ICON PLUS Aulia, Hilmi Zaky; Garniwa, Iwa
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 2 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i2.33723

Abstract

Optical fiber is a telecommunications transmission medium that has a large bandwidth and bit rate so that it can meet the needs of today's data services with great reliability and efficiency. Optical fiber applications continue to be broad and have included seabed networks, terrestrial networks, metropolitan and regional scope networks, and small-scale networks. Optical fiber communication systems have 2 factors that affect the quality of network performance, namely internal aspects and external aspects. These internal and external aspects can degrade the performance quality of the optical fiber used and can cause attenuation and other transmission losses. As an effort to prevent sudden and significant deterioration in the quality of a network, it is necessary to try regular maintenance activities such as scheduled fiber optic cable network service quality measurements. These maintenance activities can help ensure network capacity increase decisions. One of the quality of service parameters that is often measured is transmission attenuation and received signal energy (received power). This research examines increasing the bandwidth capacity of PT PLN ICON PLUS in the Central Sumatra region during a network anomaly, namely a slow internet connection in the Rayon Panam Cluster. The sample taken from one of the customers shows the results of measuring the internet speed of 4-5 Mbps only, while the service taken is 10 Mbps. The results of checking on the up-link side to OLT Rayon Panam found that the data output was close to its capacity, which was 940,919,000 bits/sec or 0.9 Gb/sec. Increasing bandwidth capacity is done by moving the OLT port on the up-link side from the gigabit ethernet port to the tengigabit ethernet port, then replacing the SR type SFP with SFP ER and adding fiber optic attenuators so that the speed test results on the customer side have returned to their original appearance., 10 Mbps.
ROSES are Read, STEEP are Green: Mapping Sustainability Indicators Across Lifecycle Stages in EV Battery Production Through a Systematic Review Nimas Ayu Arumbinang; Iwa Garniwa; Raldi Hendrotoro Seputro Koestoer; Wendy Aritenang
Automotive Experiences Vol. 7 No. 3 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11648

Abstract

The rapid expansion of the electric vehicle (EV) market presents a paradox: while increasing production and lowering costs are essential for widespread adoption, these efforts also intensify the environmental and social impacts, particularly in lithium-ion (Li-ion) battery production. Comprehensive sustainability assessments are needed across all stages of battery production. This review employed the ROSES framework to analyze 40 Scopus-indexed research papers systematically. Extracted indicators are categorized by the STEEP (Sociocultural, Technological, Economic, Environmental, and Political-Legal) dimensions. The dual approach identifies critical sustainability gaps and examines the interplay between these dimensions. By mapping each indicator to a specific lifecycle stage—ranging from raw material extraction to end-of-life disposal—the review highlights critical stages for improving sustainability in EV battery production. The study uncovers complex relationships between sustainability factors and establishes a comprehensive framework to address these challenges. As a result, it provides policymakers, industry leaders, and researchers with a solid foundation for developing informed strategies to enhance the sustainability of EV battery production.
Evaluation of Lightning Protection and Grounding System in a Hazardous Zone 2 Oil and Gas Facility Based Based on Field Testing and WinIGS Modeling Erwin Elysar; Iwa Garniwa
Journal of Business, Social and Technology Vol. 7 No. 3 (2026): Journal of Business, Social and Technology
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jbt.v7i3.693

Abstract

Background: Oil and gas facilities operating in Hazardous Zone 2 require reliable lightning protection, grounding, bonding, and surge protection systems to ensure electrical safety, protect personnel and equipment, and maintain operational continuity under potential flammable conditions. Objective: This study aims to evaluate the overall performance of the lightning protection and grounding systems in a Hazardous Zone 2 oil and gas facility based on field testing, technical assessment, and grounding system modeling. Methods: The research methods consisted of soil resistivity measurement using the Wenner four-point method, grounding resistance testing using the fall-of-potential method, continuity testing of grounding and bonding connections using the four-wire Kelvin method, lightning risk assessment based on IEC 62305-2024, evaluation of the existing lightning protection layout using the rolling sphere method, and grounding system verification using WinIGS software based on IEEE Std 80. Field testing was conducted on grounding rods, grounding rings, busbars, air terminals, down conductors, grounding cables, control panels, and other bonding components within the oil and gas facility. Results: The measurement results showed that the average combined soil resistivity value was 4.98 Ω·m with a two-layer soil model. The results of the grounding resistance test showed that most of the grounding points still met the ideal limits with a value range of 0.410 Ω to 1.580 Ω. However, one grounding point was found to be in a rejected condition and required repair. Conclusion: This study demonstrates that evaluating grounding and lightning protection systems in hazardous areas requires an integrated approach, considering grounding resistance, soil resistivity, bonding continuity, physical grounding conditions, lightning protection, and grounding system simulations.
Machine Learning-Based Model Predictive Control for Energy Efficiency Optimization in Vertical Roller Mill Cement Grinding Elman Rudolf Pakpahan; Iwa Garniwa
Journal of Business, Social and Technology Vol. 7 No. 3 (2026): Journal of Business, Social and Technology
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jbt.v7i3.704

Abstract

Background: Vertical Roller Mill (VRM) is the newest type of equipment in the cement milling process, which consists of grinding, drying and separation processes that have high energy efficiency. Objective: This research was conducted to create and develop a Model Predictive Control (MPC) Random Forest Regressor (RFR) in a process system that aims to improve the performance of the cement grinding process, where currently process control is still carried out using a conventional control system by humans/operators. Methods: Model creation is carried out by preparing input variable data, manipulated and output variables, data conditioning, statistical analysis, model development, validation, testing, and evaluation. Results: The MPC-RFR model achieved R²=0.99936, MAE=2.488, MSE=122.354, with SEC reduced from 35.47 to 29.46 kWh/ton (16.94% reduction) using MPC-RFR, and further to 27.47 kWh/ton (22.55% reduction) with SLSQP optimization, yielding potential annual savings of IDR 8.6–11.5 billion. Conclusion: The MPC-RFR-SLSQP approach achieved 22.55% SEC reduction in VRM cement grinding, demonstrating significant potential for industrial energy efficiency and production cost optimization in the cement sector.
Analysis Of Improvements To The Automatic Generation Control (AGC) Frequency Regulation System In The Java Madura Bali System For Intermittent New And Renewable Energy (EBT) Interconnection Bilkis Mukhlisoti; Iwa Garniwa
Jurnal Ekonomi, Teknologi dan Bisnis Vol. 2 No. 7 (2023): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v2i7.49

Abstract

Meningkatnya penetrasi Energi Baru Terbarukan Intermittent akan berpotensi mengganggu kestabilan sistem, terutama pengaturan frekuensi sistem. Hal tersebut dikarenakan sifat karakteristik unik yaitu intermittency daya, variability output, dan reduksi inersia. Sistem pengaturan frekuensi sekunder, Automatic Generator Control, yang terinstall pada sistem kelistrikan Jawa Madura Bali membutuhkan sebuah pengembangan design sebagai langkah mitigasi respon frekuensi terhadap fenomena EBT Intermittent. Penelitian ini mengusulkan AGC menggunakan design kontrol Proportional Integral Derivative dengan mentambahkan faktor EBT Intermittent. Hal tersebut memberikan hasil Peningkatan kinerja dinamis AGC sehingga diperoleh peningkatan kecepatan respon sistem menuju frekuensi nominal. Hal tersebut sangat penting untuk mendapatkan manajemen energi sistem Kelistrikan JAMALI yang sesuai dengan kriteria operasi, yaitu andal, mutu dan ekonomis
Analysis of the Effect of an IoT Monitoring System on the Rate of Voltage Decline in 18650 Li-Ion Batteries Using Deep-Sleep and Non-Deep-Sleep Strategies Fathur Dwipa Syaveyenda; Iwa Garniwa
Eduvest - Journal of Universal Studies Vol. 6 No. 6 (2026): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v6i6.53251

Abstract

IoT-based monitoring systems often rely on batteries as their main power source; however, continuous data acquisition and transmission can accelerate battery voltage drop, thereby reducing operational lifespan. This research analyzes the effect of an Internet of Things (IoT)-based monitoring system on the voltage drop rate of 18650 Li-ion batteries, and compares the characteristics of voltage drop in deep-sleep and non-deep-sleep operating modes using a comparative quantitative experimental approach. The ESP32-based monitoring system was tested under three operating conditions: baseline (without a monitoring system), deep-sleep, and non-deep-sleep. Battery voltage measurements were carried out periodically over a predetermined observation duration. The results show that the IoT monitoring system affects the characteristics of battery voltage drop, and that different device operating modes result in different voltage drop rates. The non-deep-sleep condition exhibits the fastest voltage drop, while the deep-sleep strategy is able to reduce the rate of voltage drop more effectively than continuous operation. These findings indicate that the deep-sleep strategy contributes to improved energy efficiency in battery-based monitoring systems and may represent a more appropriate approach to slowing the rate of battery discharge, supporting the development of more energy-efficient and reliable IoT systems.
Low-cost environmental chamber for battery calendar aging under tropical conditions: design and validation Uvi Desi Fatmawati; Iwa Garniwa; Faiz Husnayain; Danang Lelono; Kuwat Triyana; Amelia Chandra Pratiwi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 24, No 3: June 2026
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v24i3.27666

Abstract

This study presents a low-cost environmental chamber designed to replicate tropical temperature and humidity conditions for calendar-aging studies of LiFePO₄ lithium iron phosphate (LFP) cells. The system integrates passive insulation with an Arduino-based active control system for real-time monitoring. The design’s novelty lies in its cost-effective ability to maintain tropical-specific profiles, validated against Meteorology, Climatology, and Geophysics Agency (BMKG) meteorological data to ensure correlation with diurnal cycles. Experimental results demonstrate stable operation for 13 consecutive days, with an average temperature of 29.47 °C and a stability metric of ±0.61 °C, keeping 100% of data within the 25–35 °C target. Although relative humidity (RH) showed an average of 76.52%, its stability was quantified by a 96.98% success rate in maintaining the 70–80% target range. The chamber’s suitability for long-term degradation studies was confirmed via a one-month calendar-aging test on a 15 Ah LFP cell, where tha battery capacity decreased from 100% to 99.58%. These results demonstrate that the proposed chamber reliably maintains tropical environmental conditions and is suitable for long-term, low-cost battery aging studies.
Environmental impact on electric vehicle: A cradle-to-cradle approach for various vehicle technologies toward sustainable transportation Muhammad Idris; Iwa Garniwa; Tri Edhi Budhi Soesilo; Suyud Warno Utomo
International Journal of Renewable Energy Development Vol 15, No 2 (2026): March 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61174

Abstract

The transition to sustainable transportation is critical to global efforts to mitigate climate change and reduce environmental degradation. Life cycle assessment (LCA) provides a comprehensive framework for evaluating the environmental impacts of various vehicle technologies throughout their entire life cycle. Numerous studies have applied cradle-to-gate, cradle-to-wheel, and cradle-to-grave approaches. However, increasing material waste from vehicles and batteries is expected to become a significant environmental challenge due to intensive mining and resource extraction activities. To address this issue, the cradle-to-cradle approach is proposed to mitigate environmental impacts during the end-of-life phase through material recycling and recovery. This study examines manufacturing, operational, and end-of-life phases across various vehicle technologies. Unlike traditional cradle-to-grave assessments, the cradle-to-cradle approach promotes resource circularity by integrating material reuse and recycling into the evaluation process, thereby minimizing waste and optimizing resource efficiency. The analysis identifies critical indicators, including energy consumption, air quality, and greenhouse gas (GHG) emissions. Although electric vehicles (EVs) significantly reduce operational emissions, they present challenges related to battery material extraction and end-of-life management. By incorporating cradle-to-cradle principles, this study highlights strategies to enhance material recovery and reusability, particularly for battery components and lightweight materials. Furthermore, this research underscores the importance of adopting renewable energy sources and circular economy principles in the transportation sector to achieve sustainability goals. Policy recommendations include strengthening recycling infrastructure, incentivizing eco-friendly vehicle design, and fostering cross-sector collaboration. The findings contribute to a deeper understanding of sustainable vehicle technology pathways and provide a framework for reducing environmental impacts while meeting growing transportation demands.
Optimization of Mechanical Performance Polymer Insulators SiR Using CFA Waste as Filler Miftahul Fikri; Iwa Garniwa Mulyana K; Christiono Christiono; Andi Amar Thahara
Jurnal IPTEK Vol 29, No 1 (2025): May
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2025.v29i1.4923

Abstract

This study investigates the use of coal fly ash as a filler in Room Temperature Vulcanization (RTV) silicone rubber to enhance its mechanical properties. Fly ash, which contains silica, has the potential to improve the strength of the polymer. The research aims to optimize the composition of fly ash in RTV silicone rubber composites using the quadratic regression method, focusing on tensile strength and elongation performance. Tests were conducted according to ASTM D 412 standards for tensile strength and elongation. The results showed that the optimal fly ash composition for tensile strength was 38.11%, resulting in a tensile strength of 0.19 and a Mean Absolute Percentage Error (MAPE) of 13.64%. For elongation, the optimal composition was 14.95%, with an elongation value of 192.094 and a MAPE of 24.75%. This study provides valuable insights into how fly ash can be used to enhance the mechanical properties of RTV silicone rubber composites.
Co-Authors Abdul Multi Abdul Multi Abdul-Malek, Zulkurnain Adinda Prawitasari Agus Sugiyono Ahmudi, Ali Amelia Chandra Pratiwi Andi Amar Thahara Andi Amar Thahara Aulia, Hilmi Zaky Azhar, Fakhrudin Bilkis Mukhlisoti Budi Sudiarto CHRISTIONO CHRISTIONO Christiono, Christiono Citra Candranurani Damar Ravie Cahyadi Daulay, Andini Dwi Khairunnisa Efendi, Juwani Eka Nurdiana Eko Supriyanto Elman Rudolf Pakpahan Erwin Elysar Fatah, Martin Choirul Fathur Dwipa Syaveyenda Fauzan Hanif Jufri Femy Sanana Sanvia Fikri, Miftahul Fikri, Miftahul Frederick Sakaja Ginting Hanafi Anis Alamri Harahap, Saskia Saraswati Hudaya, Chairul Husnayain, Faiz Ifanda, Ifanda Jan, Pidanic Jarot M Semedi, Jarot M Kartika Tresya Mauriraya Kartika Tresya Mauriraya Kholid Akhmad, Kholid Krishananto, Thomas Puri Kuwat Triyana M Ahsin Sidqi M. Aldrin Julianto Miftahul Fikri Mohd Esa, Mona Riza Monika, Ratih Muhammad Fahri, Muhammad Muhammad Idris Muhammad Pinandhito Adi Dharma Nainggolan, J M Nimas Ayu Arumbinang Novi Indriani Nurliyanti, Vetri Oh, Seongmun Pasra, Nurmiati Prasetyo Aji Prawitasari, Adinda Purba, Kevin Pangestu Putra, Kharisma Darmawan Putranugraha, Derry Putri Utami, Dannya Maharani Rahardjo, Imam Arif Raharjo, A Raldi Hendrotoro Seputro Koestoer ROMADHONI, MUHAMMAD LUTHFIANSYAH Samsurizal Samsurizal Samual, Muhammad Gillfran SAPUTRA, DWI CAHYA AGUNG Sikumbang, Supriyanto Suci Rositawati Suwargono, Son Suyud Warno Utomo Syafei, Suhraeni Syamsir Abduh THAHARA, ANDI AMAR TIO, CHRISTIONO Tri Edhi Budhi Soesilo Uno Sudibyo Utami, Ananda Rizky Uvi Desi Fatmawati Wendy Aritenang Widya Astriyani Widya Faisal Wahyudi Widyantara, Dwitiya Bagus Yumnaristya, Syefiara Hania Z Day, Faizatul Hasanah