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International Journal of Renewable Energy Development
Published by Center of Biomass and Renewable Energy
ISSN : 22524940     EISSN : 27164519     DOI : https://doi.org/10.61435/ijred.xxx.xxx
Core Subject : Science, Engineering,
Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
The International Journal of Renewable Energy Development - (Int. J. Renew. Energy Dev.; p-ISSN: 2252-4940; e-ISSN:2716-4519) is an open access and peer-reviewed journal co-published by Center of Biomass and Renewable Energy (CBIORE) that aims to promote renewable energy researches and developments, and it provides a link between scientists, engineers, economist, societies and other practitioners. International Journal of Renewable Energy Development is currently being indexed in Scopus database and has a listing and ranking in the SJR (SCImago Journal and Country Rank), ESCI (Clarivate Analytics), CNKI Scholar as well as accredited in SINTA 1 (First grade category journal) by The Directorate General of Higher Education, The Ministry of Education, Culture, Research and Technology, The Republic of Indonesia under a decree No 200/M/KPT/2020. The scope of journal encompasses: Photovoltaic technology, Solar thermal applications, Biomass and Bioenergy, Wind energy technology, Material science and technology, Low energy architecture, Geothermal energy, Wave and tidal energy, Hydro power, Hydrogen production technology, Energy policy, Socio-economic on energy, Energy efficiency, planning and management, Life cycle assessment. The journal also welcomes papers on other related topics provided that such topics are within the context of the broader multi-disciplinary scope of developments of renewable energy.
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 5 Documents
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Search results for , issue "accepted articles" : 5 Documents clear
Towards the Sustainability of an Oil Refinery: A Synergy between ISO 50001 and ISO 14001 Management Systems Chaves Almanza, Fabio Daniel
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.61162

Abstract

The most implemented standards worldwide for Energy Management Systems (EnMS) and Environmental Management Systems (EMS), ISO 50001 and ISO 14001 respectively, maintain a close correspondence due to the Harmonized Structure (HS) recently established by the International Organization for Standardization (ISO). However, achieving greater energy efficiency does not always align adequately with environmental issues, which is most evident in fossil fuel-based industries. Therefore, this work aims to explore a synergy between these standards and use it to evaluate a technological change in an oil refinery, for better energy performance and especially environmental sustainability. The results show that the change in technology increases electric efficiency from 14% to 45% and the rate of atmospheric emissions per unit of energy generated decreases by 15% on average. However, as fuel consumption doubles, the total emission rises by about 100%. This conflict between energy and environmental performance leads to an analysis of sustainable resource management to better understand the relevance of the change in technology as an appropriate solution for the refinery in the gradual transition to clean energy. The findings of this work shed light on how to deal with oil refineries in the global landscape of urgent sustainable development.
Optimization of Biodiesel Production from Candlenut Oil via Simultaneous Reaction Using a Bifunctional CeO2.CaO Catalyst Widayat, Widayat
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.61065

Abstract

The biodiesel synthesis process with a high free fatty acid content can be accomplished in a single stage using solid catalysts that function simultaneously as both base and acid catalysts. In this study, CeO₂.CaO was used as a bifunctional catalyst for biodiesel synthesis from candlenut seed oil. Catalyst characterization includes FTIR, BET, SEM-EDX, and TPD analysis. Process optimization was carried out using the central composite design method on Design Expert software. To determine the effect of each process variable on the simultaneous reaction, the effect of methanol-to-oil molar ratio, catalyst loading, and reaction temperature on FAME yield was also analyzed. The optimum operating conditions to achieve high FAME yield were found at methanol-to-oil molar ratio of 10.3:1, 5.39% w/w catalyst loading, and a reaction temperature of 60°C.
Economic Environmental Optimization in Multiple Renewable Energy Sources with Demand Response based on Multi-Objective Optimization Algorithm Li, Zhifeng; Zhang, Shuang
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61951

Abstract

The use of renewable energy sources in distribution networks results in considerable environmental and economic benefits, but it introduces challenges related to uncertainty, intermittency, and system stability. A complete multi-objective optimization model is developed that integrates renewable energy units, battery energy storage systems, electric vehicles, demand response programs, and hydro turbine units to solve these problems. The proposed methodology achieves cost savings and reduces carbon footprint while maintaining operational stability in the system. The optimization model includes full mathematical representations of all components including photovoltaic and wind generation systems and battery energy storage system state-of-charge dynamics and electric vehicle charging and discharging schedules and controllable hydro generation. A time-of-use demand response scheme is adopted to model demand flexibility which allows for load shifting and increased renewable utilization. The model is employed in a case study of 150 customers; the framework shows its efficiency through comparative simulations that evaluate performance under scenarios with demand response and without demand response. The results show that demand response reduces peak demand, improves storage coordination, and increases renewable integration. The demand response lowered costs to $6,300-$11,150 and emissions to 12,825-12,860 kg. The configuration of electrical vehicle and battery energy storage systems are combined to achieve peak shaving allowing customers to support the grid and the hydro turbine can provide effective back up power when the renewables are unavailable. The results indicate that coordinated optimization of renewables with storage and demand flexibility leads to improvements in cost-emission performance while enhancing sustainability and system resiliency.
Mathematical model to evaluate the effect of key operating conditions on proton exchange membrane fuel cell performance Do, Tan-Thich; Vi, Trung-Kien; Pham, Cong-Son
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62184

Abstract

Nowadays, proton exchange membrane fuel cells (PEMFCs) are regarded as a promising energy source for future applications due to their high power density, high efficiency, relatively low operating temperature, fast start-up capability, and zero emissions. During PEMFC operation, performance is influenced by numerous factors. Therefore, developing a mathematical model to evaluate the effects of key operating conditions on PEMFC performance and energy efficiency is both necessary and significant in the field of fuel cells. In this study, a mathematical model was developed using MATLAB/Simulink and subsequently validated through a series of experiments to assess its accuracy. The results demonstrate that PEMFC performance is strongly affected by operating conditions, including operating temperature, operating pressure, membrane thickness, cathode gas type, cell active area, and the number of cells in the stack. In addition, water, heat generation, energy efficiency, and gas consumption were also considered in the model. The findings indicate that operating temperature and pressure are the most influential parameters affecting PEMFC performance and energy efficiency. When the operating temperature increased, the cell performance improved due to enhanced electrochemical reaction kinetics and improved electrical conductivity. However, when the PEMFC operates at temperatures above 70 oC, a deterioration in performance is observed. This behavior can be attributed to membrane dehydration at elevated temperatures, which reduces proton conductivity and, consequently, lowers the output cell voltage. Increasing pressure reduces membrane resistance and interface contact resistance, leading to a decrease in voltage losses and an improvement in cell voltage. At a current density of 0.5 A cm−2, the cell voltages are 0.550, 0.559, 0.564, 0.568, 0.571, and 0.574 V for anode operating pressures of 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 atm, respectively. Overall, this study provides a reliable and precise tool for predicting PEMFC performance under varying operating conditions.
Single-Layer Graphene Modified TiO₂ Photoanode for Enhanced Efficiency of Chlorophyll-Based Dye-Sensitized Solar Cells Uzfi Helmi Zamzami; Prihanto Trihutomo; Aminnudin Aminnudin; Tuan Amran Tuan Abdullah
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62328

Abstract

The escalating need for renewable energy resources has promoted research and development in dye-sensitized solar cells (DSSCs) with improved performance using sustainable and environmentally friendly materials. This study aims to synthesize and characterize TiO₂–graphene composites as photoanodes to enhance electron transport and electrical conductivity in DSSCs sensitized with chlorophyll dye. TiO₂–graphene composites were prepared with graphene concentrations of 0.5%, 1.0%, and 1.5% v/v, while pure TiO₂ was used as a control sample. The resulting materials were deposited as photoanode films and Morphological, structural, chemical, and optical properties were examined through SEM, XRD, FTIR, and UV–Vis spectroscopy. The photovoltaic performance of the assembled DSSCs was evaluated through current–voltage (I–V) measurements. The results indicate that graphene incorporation significantly improves surface morphology and promotes stronger interfacial interaction between TiO₂ and graphene, as evidenced by the formation of Ti–O–C functional bonds. The presence of graphene also leads to a slight reduction in TiO₂ crystallinity, which is favorable for charge transport. UV–Vis analysis reveals a redshift in the absorption edge and A decrease in the optical band gap was observed, indicating enhanced responsiveness to visible-light irradiation. Among the investigated compositions, the TiO₂–graphene photoanode with 1.0% v/v graphene exhibits the best photovoltaic performance, achieving an energy conversion efficiency close to 1% and a fill factor of approximately 62%. Higher graphene content (1.5% v/v) results in particle agglomeration and reduced film uniformity, which negatively affects device performance. Overall, this study demonstrates that moderate graphene addition effectively enhances conductivity, charge transfer, and photoanode stability, highlighting TiO₂–graphene composites as promising eco-friendly materials for efficient and sustainable DSSC applications

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