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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 6 Documents
 1 
Search results for , issue "accepted articles" : 6 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.
Light intensity enhances fatty acid and biomass composition of an acidophilic Euglena sp. isolated from Dieng Peatland, Central Java for biofuel production David Aritonang; Shela Delfia Ramadhana; Renata Adaranyssa Egistha Putri; Angga Puja Asiandu; Tia Erfianti; Kartina Kartina; Brilian Ryan Sadewo; Eko Agus Suyono
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.2026.61637

Abstract

Optimizing environmental factors in cultivating microalgae is essential to obtain a high biomass yield for biodiesel and other biomass related products production, which is a green renewable energy source to overcome the scarcity of fossil fuel energy in the future. Biodiesel can be produced using microalgal lipids in the form of Fatty Acid Methyl Esters (FAMEs). One of the promising strains is Euglena sp., an acidophilic microalga that produces various valuable bioproducts, including lipids, as biodiesel feedstocks. Here, we studied light intensity combined with 15% CO2 to enhance the production of FAMEs and other metabolites in a local strain of Euglena sp. under 500 lux, 2,100 lux, 4,500 lux, 6,000 lux, and 8,500 lux. We also evaluated its effect on the growth, biomass, and accumulation of primary and secondary metabolites, such as lipids, carbohydrates, proteins, FAME, and pigment contents. Based on this study, the maximum saturated, monounsaturated, and polyunsaturated acids were found in the 8,500 lux (42.345%), 500 lux (59.01%), and 4,500 lux (23.705%), respectively. The highest percentage of FAMEs was C16:1 or methyl palmitoleate (32.46%) found at 500 lux. However, the total FAMEs in 500 lux (13 FAMEs) were lower than those in the other treatments (24 FAMEs). Meanwhile, the highest biomass accumulation, specific growth rate, lipids, carbohydrates, and pigment contents such chlorophyll a, b, carotenoid were found in 6,000 lux. The results indicated that variations in light intensity with 15% CO2 injection resulted in specific differences in growth rate, productivity of primary and secondary metabolites, and fatty acid production in Euglena sp.
Experimental analysis of a novel aerofoil-savonius type vertical axis wind turbine with an aerodynamic augmentation shell Mohamad Hussein Farhat; Ahmad Sedaghat; Nader Ghareeb; Mohamed El Badawy; Mohammad Nazififard; Ali Mostafaeipour
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.2026.62935

Abstract

Savonius vertical axis wind turbines (SVAWTs) are attractive for urban and distributed energy applications because of their simple construction, omnidirectional wind acceptance, and self-starting capability, but their performance is limited by relatively low aerodynamic efficiency and high cut-in wind speeds. This study experimentally investigates a modified SVAWT that combines NACA0024 aerofoil sections at the blade extremities with an adjustable half-cylinder aerodynamic augmentation shell. The integrated configuration is evaluated as a proof-of-concept under controlled wind-tunnel conditions using both no-load and electrical-load measurements. The turbine was positioned at the exit of an open wind tunnel and tested over tunnel speeds of 9–18 m/s. The shell-assisted configuration reduced the cut-in tunnel speed from 12 to 9 m/s, increased rotational speed by up to 30%, and improved no-load voltage output by approximately 10–27%. Under resistive loading, the maximum power coefficient increased from 0.0086 to 0.0172 at 15 m/s, while peak electrical power increased by approximately 140% at 12 m/s, 100% at 15 m/s, and 68% at 18 m/s. The shell-assisted configuration also reduced the outlet-to-inlet velocity ratio and broadened the operating range over which higher torque coefficients were maintained. However, the tip-speed ratio remained below unity under all test conditions, and the absolute power coefficients were low because of the small prototype scale, low Reynolds number, absence of endplates, and rotor-generator constraints. The results demonstrate that the combined aerofoil-tip and shell configuration can provide measurable relative performance improvements compared with the same rotor operated without the shell. Further work is required to optimize the shell and aerofoil parameters, validate the flow mechanism directly, and assess performance at higher Reynolds numbers and under realistic urban wind conditions. 
Enhance EV Station Charge and Discharge Based on Deep Learning Forecasting Method Incorporating Renewable Energy Sources and Multi-Objective Optimization Algorithm Delu Li
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.2026.61916

Abstract

Electric vehicle charging stations must be efficient and sustainable to meet increasing demand. This exploration recommends the incorporation of RESs, energy storage systems (ESS), and vehicle-to-grid (V2G) technology to boost charging and discharging operations using DL-based forecasting. The framework predicts energy generation, electric vehicle (EV) demand, and storage dynamics using an RNN to capture non-linear relationships and temporal dependencies. The model optimizes charge and discharge cycles in real time to reduce grid reliance, operational costs, and emissions, while accounting for energy pricing and grid stress. The system incorporates solar and wind energy generation along with fuel cells and battery storage to create a coordinated configuration that adapts to fluctuations in renewable energy availability. Battery storage retains excess energy during periods of low demand and high renewable availability, while V2G technology enables EVs to supply energy back to the grid during peak demand, improving grid stability and operational efficiency. This hybrid setup reduces dependency on the grid, particularly during periods of high costs and emissions. A comprehensive simulation is conducted using data that includes solar, wind, and load profiles, in addition to real-time pricing and grid conditions. Outcomes showcase a 6.7% drop in operational costs and a 4.4% decrease in emissions compared to the baseline scenario. Utilizing battery energy storage systems (BESS) and V2G technology enables better grid load balancing, especially during peak demand periods. This article presents a novel methodology for optimizing EV charging and discharging, offering a sustainable, economical, and scalable solution for future energy infrastructures.
Effect of Hydrogen Co-firing on Combustion Efficiency, Steam Production, and Emissions of a B7 Diesel Water-tube Boiler: An Experimental and Semi-empirical Combustion Modeling Study Pongsakorn Kachapongkun
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.2026.62817

Abstract

Hydrogen co-firing is a near-term decarbonization option for industrial steam boilers in Southeast Asia, where B7 diesel (a 7% palm-oil FAME blend) is the mandated fuel, yet experimental evidence in this class of equipment remains limited. We report a controlled experimental campaign on a 1,000 kg/hr water-tube boiler (Kawasaki 15750) at H₂/diesel energy ratios from 0 to 30%, with four steady-state replicates per condition. We interpret these measurements with a calibrated PSR/PFR combustion model with extended Zeldovich NOₓ kinetics and a 2D axisymmetric CFD simulation. At 30% H₂, steam output rose 24.3% (323.8 → 402.4 kg/hr) with diesel feed held constant; combustion air was trimmed by supplemental O₂ to hold stoichiometry roughly constant as the H₂ ratio climbed (contributing ~10–15% of the NOₓ rise). CO₂ intensity per kg steam fell 20.1% (202.5 → 161.9 g/kg), CO dropped 73.2% (106.5 → 28.5 ppmv), and estimated NOₓ rose ~64% (NO₂-derived; see §2.3), consistent with thermal-NOₓ amplification. System efficiency (ASME PTC 4.1 Direct Method) peaked at 93.42% near 5% H₂ and declined to 87.45% at 30% H₂. Second-order polynomial correlations (Eqs. 6–9, R² ≈ 0.96–0.99) give compact screening rules, and the CFD model reproduced the measured trends. A fuel-cost-only sensitivity at 2026 Thai market prices (excluding capital, storage, and safety costs) puts the fuel-cost-favourable window at about 12% H₂; under the IRENA Green Hydrogen trajectory, this window expands to the full 0–30% range by 2030. At low-fire operation, H₂ co-firing is a practical retrofit option for B7 diesel water-tube boilers, with NOₓ as the principal trade-off.

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