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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 188 Documents
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PICO-HYDRO POWER GENERATION USING A SMALL WATER TURBINE FOR THE TERTIARY CANAL APPLICATION QUIPO, JUNE; QUIPO, RHEALYN
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 Farisan Robbani
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 Katkov, Valerii
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 Thakur, Neha; Singh, Bikram; Kumar, Dr. Pankaj
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.
THE EFFECT OF VARIATION OF MIXTURE OF IJUK FIBER AND COCONUT FIBER WITH EPOXY MATRIX ON THE MECHANICAL STRENGTH OF COMPOSITE Li, Elia Fransisco Manalu; Yulianto, Dody; Kurniadi, Shandy; Prasetyo, Ari; Saragih, Sehat Abdi; Lazrisyah, Sutan; Rahman, Jhonni; Hastuti, Kurnia; Elfiano, Eddy
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

Fibre-based composites continue to be investigated and developed as alternative materials to replace metals, primarily due to their advantageous properties of high strength and lower weight compared to metals. This study aims to fabricate fibre composites using ijuk fibres and coconut coir fibres as a matrix with epoxy resin. In this research, mixtures of ijuk fibres, coconut coir fibres, and epoxy resin were prepared in proportions of 20%:30%:50%, 25%:25%:50%, and 30%:20%:50%. The highest bending strength test results were obtained in specimen 3, which consisted of a mixture of 30% palm fibre, 20% coconut fibre, and 50% epoxy resin.  This specimen had a tensile strength value of 18.93 MPa and an impact value of 0.387 Joules/mm². This result can be attributed to the increasing proportion of ijuk fibres and the decreasing proportion of coconut coir fibres within the epoxy resin matrix, which influences the elastic strain of the fibre core (cellulose). The higher cellulose content of ijuk fibres enhances bending strength and impact resistance. This is supported by the impact (Charpy) test results, where specimen 3 (30%: 20%:50%) exhibited the highest bending and impact strength. Conversely, increasing the proportion of coconut coir fibres reduced the impact strength. The fracture morphology revealed that specimen 1 exhibited a brittle fracture, whereas specimens 2 and 3 exhibited a fibrous brittle fracture.
ANALYSIS OF PENSTOCK DESIGN AND LOSSES USING DARCY-WEISBACH EQUATION IN A MICRO HYDRO POWER PLANT AT WISATA TELAGA RIVER, MALANG Muhammad Syafiudin; Rahman Arifuddin; Resi Dwi Jayanti Kartika Sari
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 presents the design analysis and energy loss calculation of a penstock system for a micro hydro power plant at the Wisata Telaga River. The analysis includes the determination of pipe length using geometric estimation, selection of pipe diameter based on hydraulic parameters, and evaluation of energy losses using the Darcy-Weisbach equation. A 0.45 m HDPE pipe was selected, and a gross head of 9.35 m was considered. The calculated flow velocity was 2.67 m/s, yielding a major head loss of 0.19 m and a minor loss of 0.18 m. The effective head was 8.98 m, resulting in an estimated net power output of 31.22 kW with an efficiency of 96%. These findings demonstrate the technical feasibility and efficiency of the proposed penstock design for rural micro-hydro applications.
DESIGN OF ORGANIC WASTE PROCESSING EQUIPMENT FOR LIQUID SMOKE PRODUCTION Ma'a, Mustaza; Zulfa, Hafiz; Novison, Roni; Akbar Irdam, Fortinov
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 presents the design of an organic waste processing device to produce liquid smoke through combustion, particle separation, and condensation processes. The system consists of a combustion chamber, a cyclone separator, and a condensation tube, which were designed and analyzed numerically with software. Dry organic waste such as coconut shells, rice husks, and leaves was used as raw material with a capacity of 15 kg per cycle. Simulation results show that the combustion chamber reached a maximum temperature of approximately 333°C, the cyclone separator achieved flow velocities of 4.72–7.48 m/s with effective particle separation, and the condensation tube reduced the smoke temperature to around 27°C, enabling liquid smoke formation. This device offers potential as a solution for organic waste management while producing valuable by-products such as natural pesticides and organic preservatives.
IMPACT OF LOAD DISTRIBUTION ON ENERGY GENERATION IN A PIEZOELECTRIC FLOOR PROTOTYPE Tirta, Bram
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 increasing global demand for energy has intensified the search for sustainable and environmentally friendly alternatives, one of which involves harvesting mechanical energy from human activities using piezoelectric materials. This study designed and evaluated a piezoelectric floor prototype consisting of 128 parallel-connected PZT elements supported by spring columns as force transmission media, employing a Research and Development (R&D) approach. Experimental tests were conducted under two loading patterns (walking across and jumping) with mass variations of 69kg and 98kg, each repeated ten times. The output signals were recorded using an oscilloscope in a closed-circuit configuration with a 1 Ω resistor as the load. Results indicate that the jumping pattern produced higher voltage and current compared to walking, while increased body mass significantly enhanced system performance. Overall, the generated voltage ranged from 1.5 to 8.9V with an average current up to 11.7mA, where jumping with the heavier mass yielded the highest output. These findings confirm that both mass variation and loading pattern directly affect energy performance and highlight the potential of piezoelectric technology to contribute to sustainable energy development. Further studies are required to improve signal stability and to integrate the system with energy storage devices, thereby supporting practical large-scale applications.

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