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INDONESIA
Journal of Renewable Energy and Mechanics
Published by Universitas Islam Riau
ISSN : 27146219     EISSN : 26148315     DOI : 10.25299
Core Subject : Social, Engineering,
Automotive Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences
REM is a peer-reviewed and open access journal that publishes significant and important research from area of Mechanical and Material Science and Development of Technology related with Mechanical Engineering. We accept submission from all over the world on English language. Our Editorial Board members are prominent and active researchers in renewable energy and mechanical engineering fields who ensure efficient, fair, and constructive peer-review process. All accepted articles will be published freely and available to all readers with worldwide visibility and coverage. REM (Journal of Renewable Energy and Mechanics) published periodically two times annually by Department of Mechanical Engineering, Faculty of Engineering, Universitas Islam Riau.
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Articles 94 Documents
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A Review Of The Potential Of Calliandra As A Biomass Power Plant
Journal of Renewable Energy and Mechanics Vol. 8 No. 01 (2025): REM VOL 8 NO 01 2025
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2025.14910

Abstract

Massively the use of fossil energy makes the earth poisoned by pollution, and the environment is damaged due to the resulting waste. The existence of renewable energy such as biomass can be an existing solution. One example is the calliandra plant which can be useful in many ways. This paper uses the literature review method to show that Calliandra is not only used as livestock feed but could also be used as co-firing fuel as an electric source. Producing a heat of 4,200 kcal/kg so that the ideal calliandra for firewood or charcoal. Calliandra can be used as the co-firing material in the form of biochar with a pyrolysis process.
REVIEW OF GEOTHERMAL POTENTIAL IN INDONESIA AND THE IMPACT ON CLIMATE CHANGE IN THE FUTURE
Journal of Renewable Energy and Mechanics Vol. 8 No. 02 (2025): REM VOL 8 No 02 2025
Publisher : UIR PRESS

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Abstract

Electricity is crucial at this time, but the challenge lies in reducing and replacing the use of fossil fuels, as continuous use will exacerbate climate change and harm the world. The best solution is to replace it with new renewable energy sources, such as geothermal energy, which has significant potential in Indonesia. The most considerable geothermal potential in the world is 29.038 MW. This paper uses the literature review method. The criteria for articles used as sources are research-type articles. The purpose of this article is to review the geothermal potential in Indonesia, which can be utilised and developed to reduce the use of fossil energy, which has negative impacts in the future, so that this potential can be used optimally.
A Review Of Sustainable Development Of Geothermal Energy
Journal of Renewable Energy and Mechanics Vol. 8 No. 01 (2025): REM VOL 8 NO 01 2025
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2025.15253

Abstract

Renewable energy is certainly more environmentally friendly because it can reduce air pollution and environmental damage due to exploration. The costs incurred to produce energy are cheaper because the energy source is free. Electricity is important now, but the obstacle faced is how to reduce and replace fossil energy because if it is continuously used, it will hurt the world. The best solution is to replace it with new renewable energy, such as geothermal energy, which has great potential in Indonesia. This research was conducted using a qualitative descriptive research method. The data used in this study were taken through in-depth interviews with an expert and a literature study from various relevant sources. The data was collected through in-depth interviews based on the IAEA's Sustainable Development Energy Indicator framework, which Prof. Thierry Lefèvre simplified. The results of the in-depth interviews are then combined with relevant data and literature.
A Study Of Bio-Oil Derived From Rice Husk Using Pyrolysis As A Potential Gasoline Additive
Journal of Renewable Energy and Mechanics Vol. 8 No. 01 (2025): REM VOL 8 NO 01 2025
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2025.20239

Abstract

Biomass energy is an alternative solution for reducing emissions compared to traditional energy sources because biomass is a carbon-neutral resource. In this study, rice husk biomass was processed using pyrolysis technology at temperatures of 250°C, 300°C, and 350°C, with retention times of 60 and 90 minutes. The crude pyrolytic oil was then refined through a distillation process to improve its quality, followed by chemical and physical composition tests. The results showed that the highest yield of crude pyrolytic oil was obtained at a temperature of 300°C with a retention time of 90 minutes. The distillation process produced oil with more than 90% of its carbon chains in the gasoline range (C7-C11). Additionally, a high concentration of phenolic compounds was detected in the bio-oil, making it a viable option as a fuel additive. The bio-oil derived from rice husk waste had a calorific value of 1777.24 cal/gram, indicating its potential as a gasoline blend alternative fuel
Green Nanocatalysts From Biomass For Sustainable Biodiesel Production From Used Cooking Oil
Journal of Renewable Energy and Mechanics Vol. 8 No. 01 (2025): REM VOL 8 NO 01 2025
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2025.20647

Abstract

This study presents the development of an in-house sustainable nanocatalyst derived from rice husk and sugarcane bagasse for biodiesel production from used cooking oil. The esterification and transesterification processes were carried out to convert triglycerides in the used cooking oil into fatty acid methyl ester (FAME). The biocomposite nanocatalyst produced had a particle size of 2.5 nm. The results showed that the highest biodiesel conversion yield achieved was 97.7%, under optimal operating parameters: a methanol-to-oil ratio (MTOR) of 12:1, a catalyst dosage of 6%, a temperature of 65°C, and a reaction time of 75 minutes. This catalyst demonstrated a higher conversion yield compared to similar green catalysts. Furthermore, the quality of the biodiesel produced conformed to the Indonesian National Standard SNI 7182:2005
Analysis of Rooftop Solar Power Plant Development Potential in Magelang City: A Case Study of Office Buildings, Universities, And Hotels
Journal of Renewable Energy and Mechanics Vol. 8 No. 01 (2025): REM VOL 8 NO 01 2025
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/rem.2025.20775

Abstract

The utilization of solar energy as a renewable energy source has become a priority in supporting sustainable energy transitions in Indonesia. This study analyzes the potential for installing rooftop solar power plants (PLTS) in office buildings, universities, and hotels in Magelang City. The research method involves measuring roof areas using Google Maps imagery and simulating energy production through the Global Solar Atlas. The analysis indicates that with a 20% utilization rate of potential roof areas, the corresponding installed capacity can reach 230.720–333.560 kWp. Energy production estimates show outputs of up to 11,000 kWh/month for an 80 kWp capacity. These findings underscore Magelang City's potential to support renewable energy transitions through multi-faceted collaboration. This study provides a foundation for developing sustainable energy policies in urban areas.
PICO-HYDRO POWER GENERATION USING A SMALL WATER TURBINE FOR THE TERTIARY CANAL APPLICATION
Journal of Renewable Energy and Mechanics Vol. 8 No. 02 (2025): REM VOL 8 No 02 2025
Publisher : UIR PRESS

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Abstract

This study aimed to develop a pico-hydro water turbine capable of generating electricity from a tertiary irrigation canal, harnessing water flow as a sustainable power source for rural communities. Various blade types and water barrier heights were tested, with data analysed using a factorial arrangement in a Completely Randomised Design. Results showed that the water barrier height significantly influenced power output, with a maximum theoretical power of 613 W at a barrier height of 0.4 m. The turbine achieved a rotational speed of 43 rpm and generated 63 W of actual power, corresponding to an efficiency of 13% at a barrier height of 0.3 m. Financial analysis indicated that the system could reduce a household’s annual electricity bill by 11%, confirming its technical feasibility and economic viability as a small-scale renewable energy solution.
EFFECTIVE ENERGY PLANNING REQUIRES THE ESTIMATION OF CLEAN ELECTRICITY IN NTB
Journal of Renewable Energy and Mechanics Vol. 8 No. 02 (2025): REM VOL 8 No 02 2025
Publisher : UIR PRESS

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Abstract

Nusa Tenggara Barat (NTB) is an Indonesian province with a Regional Energy General Plan (RUED) and the Mandalika Special Economic Zone (KEK), both of which have contributed to rising electricity demand across households, businesses, industries, and public services. Despite its vast renewable energy potential, NTB’s electricity supply remains largely dependent on fossil fuels. This study employs the Low Emission Analysis Platform (LEAP) to project energy demand and supply under three scenarios: Business as Usual (BAU), RUED, and Renewable Energy (RE), with projections extending to 2050. The analysis shows that under BAU, fossil fuel dependence continues, whereas the RUED pathway accelerates renewable energy adoption and reduces emissions substantially. The RE scenario demonstrates the feasibility of eliminating fossil fuel use, achieving near-total decarbonization, and significantly enhancing energy security. These findings underscore the crucial role of renewable energy in facilitating a sustainable and resilient energy transition in NTB.
DEVELOPMENT OF A VERTICAL-AXIS WIND TURBINE DESIGN
Journal of Renewable Energy and Mechanics Vol. 8 No. 02 (2025): REM VOL 8 No 02 2025
Publisher : UIR PRESS

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Abstract

The article presents the development of a modernized vertical-axis wind turbine design aimed at improving energy efficiency by eliminating turbulent losses and optimizing aerodynamic characteristics. Key innovations include the implementation of a nozzle grid with a cosine-shaped profile to stabilize airflow, the use of rotor blades with confuser-diffuser geometry, and upgraded guide vanes. Results from computational modeling and wind tunnel tests confirmed a 57% increase in airflow velocity, reduced turbulence, a 5.3% improvement in efficiency, and enhanced structural stability. The system demonstrates potential for application in standalone power supply systems at low wind speeds (from 3 m/s).
ADVANCEMENTS IN RENEWABLE ENERGY: A SUSTAINABLE SOLUTION FOR GLOBAL ENERGY DEMANDS
Journal of Renewable Energy and Mechanics Vol. 8 No. 02 (2025): REM VOL 8 No 02 2025
Publisher : UIR PRESS

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Abstract

Energy is the ability to perform work, and in today's world, the need for sustainable energy solutions is more crucial than ever. Renewable energy sources, such as solar, wind, and hydro, offer an eco-friendly alternative to conventional fossil fuels. These sources not only help conserve energy but also contribute to a cleaner environment by reducing dependence on non-renewable resources. Over the past few decades, environmental challenges have intensified, making the adoption of renewable energy technologies more necessary than ever. With the global population rising, energy consumption continues to increase, highlighting the urgent need for alternative energy solutions. This study explores the role of different renewable energy sources and how their adoption evolves with a country's economic growth, measured by real GDP per capita. India, in particular, has emerged as the fourth most attractive renewable energy market globally. The Indian government has been actively promoting sustainable energy initiatives, launching large-scale projects to accelerate the shift toward cleaner energy. The relationship between renewable energy and sustainable development, along with future opportunities in this field, is discussed in detail. The findings suggest that factors such as renewable energy production, energy efficiency, economic growth, and carbon emissions significantly influence renewable energy consumption. To further promote clean energy adoption, the study recommends increased investment in renewable energy production, improvements in energy efficiency, and advancements in green technologies.

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