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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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THE EFFECT OF VARIATION OF MIXTURE OF IJUK FIBER AND COCONUT FIBER WITH EPOXY MATRIX ON THE MECHANICAL STRENGTH OF COMPOSITE
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
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
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
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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