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Eksergi: Jurnal Teknik Energi
Published by Politeknik Negeri Semarang
ISSN : 02168685     EISSN : 25286889     DOI : http://dx.doi.org/10.32497/eksergi.v18i2.3605
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering
Design of DC Accumulator Charging using Backup Accumulator Based on Inverter and Converter Device Parlindungan Pandapotan Marpaung
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 266 Documents
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Global Trends in Hydropower Research: A Bibliometric Study Bani Septiawan; Rendy Pradityo; Aditya Nugraha; Muhammad Ashbar As-Silmy
Eksergi Vol. 22 No. 02 (2026): MAY 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i02.7533

Abstract

The transformation of the global energy sector, driven by climate change, energy security and sustainability challenges, has increased attention to renewable energy, especially hydropower as a reliable and stable source. This study aims to analyze the development of hydropower research in sustainable energy systems using an integrated bibliometric approach. Descriptive quantitative methods were applied to 2,151 Scopus indexed documents, analyzed using VOSviewer and Bibliometrix, with a focus on publication trends, keyword co-occurrence, scientific collaboration and citation impact. The results show significant growth in hydropower publications, increasing from 246 documents in 2020 to more than 516 in 2025, indicating its increasing relevance in the global energy transition. The keyword “hydropower” was identified as a central node, which is closely related to renewable energy, decarbonization and sustainability. Furthermore, the findings highlight the multidisciplinary nature of hydropower research, encompassing technological, environmental and future energy innovation aspects, along with the predominance of contributions from a few leading countries and researchers. Overall, this study provides a comprehensive mapping of the scientific dynamics of hydropower and offers strategic insights to support future progress in sustainable energy development.
Potential in Indonesia for Sustainable Energy Transition: A Bibliometric Study Misnaini Misnaini; Muhammad Ikhwan; Anugrah Aulia; Bani Septiawan; Erza Arkan Zharif
Eksergi Vol. 22 No. 02 (2026): MAY 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i02.7534

Abstract

Hydropower is a renewable energy source that has great potential in supporting the transition to a sustainable energy system, especially in Indonesia which has abundant water resources. This research aims to analyze the potential use of hydropower through a bibliometric approach with 2,151 Scopus publications analyzed using VOSviewer and RStudio (bibliometrix). The results show an increasing publication trend, indicating high global attention to hydropower. Co-occurrence analysis reveals close links with the energy system, renewable energy integration, and sustainability, confirming its role in maintaining energy stability. The thematic map shows that hydropower has a strategic position as a basic theme and driving force. Meanwhile, analysis of sources and authors shows the dominance of developed countries, especially China, which is correlated with research capacity. In developing national energy, Indonesia has great potential, but its utilization is not yet optimal due to limited research, technology and collaboration. Therefore, it is necessary to strengthen research capacity, international cooperation, and an integrated energy system approach to support national energy security and sustainability.
Modification of a Double Adsorber Series Type with Multiple Stages Installed on Biodigester for Biogas Purification Riski Gunawan Nasution; Rehan Aditya Nugraha; Desniorita Desniorita; Dyah Nirmala; Riski Gunawan Nasution
Eksergi Vol. 22 No. 02 (2026): MAY 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i02.7558

Abstract

Biogas produced from conventional biodigesters typically still contains impurities such as H₂S and CO, which can damage equipment and reduce combustion efficiency. This study aims to modify the adsorber into a series-type double adsorber integrated directly into the biodigester and evaluate its performance in purifying biogas. The study used a 200 L biodigester with 40 kg of cow rumen and 120 L of water. The fermentation process lasted 14 days with feed circulation. Purification was carried out using activated carbon as an adsorbent with a contact time of 60 minutes. Tested parameters included CH₄, H₂S, CO, O₂ levels, flame test, and FTIR characterization. The results showed that the double adsorber increased methane content from 69% to 91% and reduced H₂S to 0.7 ppm and CO to 0 ppm. The tool efficiency averaged above 90% for H₂S and CO absorption. The flame test showed an increased burning duration from 55 seconds to 1 minute 54 seconds. FTIR characterization confirmed the presence of O-H and C=O groups involved in the adsorption process. In conclusion, the series-type double adsorber modification is effective in improving biogas quality according to SNI 8019:2014.
Dual Axis Solar Tracker with Arduino-Based Voltage Monitoring Fatih Zharfa Athara; Faiz Athalla Putra; Marsellinus David Praskadana; Arief Arfriandi
Eksergi Vol. 22 No. 02 (2026): MAY 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i02.7559

Abstract

This research develops an Arduino-based dual-axis solar tracker system with real-time current and voltage monitoring. The system uses an LDR sensor to detect light direction and a servo motor to adjust the panel orientation on two axes, so that the radiation reception angle remains optimal. Electrical parameters are measured using an INA219 sensor and displayed through a display media. The research method includes design, implementation, and testing by comparing the performance of static panels and the tracking system. The results show that the solar tracker system increases the output voltage compared to static panels. The calculation produces a fill factor of 0.79 and an efficiency of 15.31%, indicating improved energy absorption performance. The developed system is effective in optimizing solar panel output and provides monitoring data for performance evaluation.
Effect of HCl-Activated Natural Zeolite Catalyst Loading on Liquid Fuel Production from Waste Engine Oil Pyrolysis Noversi Allolayuk; Alwatan Sofian; Marcopolo Ginting; Sirajuddin Sirajuddin; Muhammad Irwan; Harjanto Harjanto; Ramli Thahir; Abdul Muis; Muhammad Taufik; Abdul Halim
Eksergi Vol. 22 No. 03 (2026): SEPTEMBER 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i03.7673

Abstract

The continuous increase in motor vehicle usage has led to a corresponding rise in lubricant oil consumption, resulting in a greater volume of used lubricating oil waste. Various treatment methods can be applied to process used lubricating oil waste, one of which is pyrolysis to convert the waste into liquid fuel. This study was conducted to determine the effect of activated natural zeolite as a catalyst in the conversion of used lubricating oil into liquid fuel. The used lubricating oil was subjected to pyrolysis for 120 minutes at a temperature of 350°C, using a feed volume of 500 mL. Catalyst weight variations of 0 g, 21.5 g, 43 g, 64.5 g, and 86 g were applied. The catalyst consisted of natural zeolite crushed and sieved to 100 mesh particle size. Prior to use, the zeolite was activated using 3 M HCl. The resulting liquid fuel products were evaluated in terms of yield percentage (%Yield), API gravity (°API), density, viscosity, and GC–MS analysis. The pyrolysis process produced 287 mL, 332 mL, 387 mL, 441 mL, and 415 mL of liquid fuel, respectively. The maximum fuel yield was obtained with a catalyst weight of 64.5 g, producing 441 mL of liquid fuel with a yield of 88.2%, a density of 812.2 kg/m³, a viscosity of 2.48 cSt, and an API gravity of 42.56°. The API gravity value indicates that the liquid fuel product can be classified as kerosene.
Mapping the Digital Landscape of Renewable Energy Policy: A Systematic Literature Review and Bibliometric Analysis of Global Technological Literacy in Energy Transitions Erlita; Abiyyu Arib Mahyiyuddin
Eksergi Vol. 22 No. 03 (2026): SEPTEMBER 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i03.7707

Abstract

The global energy transition, accelerated by carbon neutrality mandates under SDG 7 and the Paris Agreement, demands an integrated approach that harmonizes structural policy design with public and institutional readiness. This study provides a comprehensive overview of how technological and digital literacy intersect with the deployment and social acceptance of clean energy policy. Utilizing a rigorous Systematic Literature Review (SLR) guided by the PRISMA framework combined with a bibliometric analysis using VOSviewer and the Bibliometrix R-package, a final corpus of 152 peer-reviewed articles published between 2020 and 2026 was synthesized. The results reveal that while technical mature systems like solar PV and wind lead global policy integration, serious bottlenecks persist in emerging domains, including green hydrogen deployment, smart grid interoperability, and vehicular electrification due to grid constraints. Furthermore, this study underscores procedural justice, public digital literacy in smart grid demand-side management, and targeted curriculum reform as critical parameters to bridge the gap between regional policy aspirations and ground-level implementation. Moving forward, this study highlights the urgency for standardized metrics for energy literacy and equity-centered, cross-national evaluation frameworks to accelerate an inclusive and digitally integrated energy transition.

Page 27 of 27 | Total Record : 266

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