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Yunita Djamalu
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INDONESIA
Journal Of Renewable Energy Engineering
Published by Universitas Negeri Gorontalo
ISSN : 29861063     EISSN : 2988554X     DOI : 10.56190
Core Subject : Science, Engineering,
Energy Engineering
Journal Of Renewable Energy Engineering (JREE) is a peer-reviewed journal published twice a year (April and October) by the Vocational Program of the State University of Gorontalo. The Vocational Journal of Science and Technology provides direct open access to its content. The aim of this journal is to provide the expression of ideas, as well as places for knowledge fields that can understand applied science and technology issues and knowledge, with a new space of journals covering the fields of science and technology. applied science and technology research including Mathematics, Physics, Technology, and Informatics
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 35 Documents
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PROSES PERANCANGAN ALAT SIMULATOR PNEUMATIC DOUBLE ACTING CYLINDER DENGAN DUA BATANG PISTON MASUK DAN KELUAR Andi, Andi Ariansyah
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.51

Abstract

A pneumatic system uses compressed air to produce pressure and provide motion. This system was invented in 1889 by Macron Matic. The pneumatic system simulator tool employs a double-acting cylinder. This research employs engineering design methods to design, manufacture, and test a simulator featuring a double-acting cylinder and two piston rods, enabling manual simulation of piston movement. Results show that among four pressure levels tested, higher air pressure decreases the time required for the piston to retract. However, as pressure increases, the time-saving efficiency lessens. Therefore, choosing an optimal pressure is essential to achieve performance without risking damage to system components. The decrease in time between 3 and 4 bars is smaller than between 1 and 2 bars, indicating that higher pressure yields diminishing returns in piston movement speed. Friction, airflow resistance, and discharge valve efficiency affect the piston's reverse stroke at elevated pressures.  
Perbandingan Kinerja dan Inovasi Material Isolator Listrik: Tinjauan Komprehensif terhadap Faktor Lingkungan, Komposisi Material, dan Metodologi Evaluatif septiyusi, Natia nursuci; Tobuhu, Gilang; Astika putra, I Nengah dwi; Abdullah, Rafli S; Abbas, zulkarnain; Ilham, Jumiati; Hidayat, Ikhsan
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.54

Abstract

Electrical insulators are vital components in power transmission and distribution systems. The performance of insulators is significantly influenced by environmental conditions, including humidity, pollution, and temperature, as well as their material composition. This study reviews several recent scientific publications related to the performance of ceramic, polymer, and composite insulators under various environmental conditions. The analysis indicates that environmental contamination significantly reduces insulator performance, whereas industrial and agricultural waste-based materials, such as rice husk ash (RHA) and fly ash, offer considerable potential as innovative, environmentally friendly solutions. Experimental and simulation methods play a crucial role in understanding the electrical characteristics of insulators.
ANALISIS KEANDALAN SISTEM JARINGAN DISTRIBUSI 20 KV PENYULANG BP1 DI PT.PLN (PERSERO) UP3 GORONTALO DENGAN METODE SECTION TECHNIQUE Polingala, Reynaldi; Harun, Ervan Hasan; Yusuf, Taufik Ismail
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.59

Abstract

One of the important factors and main indicators of the quality of electricity supply services from the system to customers is the reliability of the distribution network. Frequent disruptions to the distribution network can reduce the reliability of electricity distribution. Based on data obtained from PLN UP3 Gorontalo, the BP1 feeder is a vulnerable area that experiences the most frequent service disruptions, with a total of 96 disruptions during 2023. This study aims to determine the reliability index value of the 20 kV distribution system for the BP1 feeder using the section technique, and to determine the undistributed energy and the losses incurred due to blackouts in the BP1 feeder. The method used in this study is the section technique, which evaluates a distribution system by assessing how the failure of a piece of equipment affects its operation. The results of the study show that the reliability index for the BP1 feeder in 2023 is SAIFI of 15.43 times/customer/year, SAIDI of 3.61 hours/customer/year, and CAIDI of 0.23 hours/customer. From these results, it can be concluded that the SAIFI value for the BP1 feeder is not yet reliable, as it does not meet the SPLN 68-2:1986 standard of 3.2 times/year. Meanwhile, the SAIDI value of the BP1 feeder is reliable because it meets the SPLN 68-2:1986 standard value of 21.09 hours/year. The unsupplied energy (ENS) is 18,809.81 kWh, so the loss value for the BP1 feeder in 2023 is Rp. 30,933,106.55.
ANALISIS PENGARUH SUDUT DATANG CAHAYA MATAHAHARI TERHADAP DAYA KELUARAN PANEL SURYA Kadir, Moh. Fitran; Harun, Ervan Hasan; Ilham, Jumiati
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.60

Abstract

Indonesia's rising energy needs push the adoption of solar energy to reduce fossil fuel use. This study analyzes how sunlight's incident angle affects the output power of polycrystalline solar panels. It also determines the optimal angle for efficiency. A quantitative experiment used two panel setups: a mobile panel set at 90° and a fixed panel that tracked natural angle changes (07:00–17:00 WITA). Over seven days in Gorontalo, voltage, current, power, light intensity, panel temperature, air temperature, and humidity were measured. Results showed that the incident angle greatly influenced output power. The mobile panel produced a maximum power of 8.13 W at an intensity of 8.7846 W/m2 (09:30). The fixed panel peaked at 6.76 W at a 69° angle (12:00). For the fixed panel, the optimal angle ranged from 50° to 70°. Efficiency dropped when panel temperature exceeded 50 °C. In general, mobile panels provided higher and more stable performance. This highlights the value of a solar tracking system or determining the optimal angle to boost efficiency and support national energy security.
THERMAL MANAGEMENT AT THE ENERGY WATER ENVIRONMENT NEXUS: FROM PHOTOTHERMAL MATERIALS AND BUILDING ENVELOPES TO GRIDRESPONSIVE ENERGY SYSTEMS Djamalu, Yunita; Djafar, Romi; Fauziah, Siti; Pakaya, Roys
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.61

Abstract

Thermal phenomena sit at the heart of today’s most important sustainability challenges, producing clean water, maintaining healthy indoor climates, valorizing biomass, and balancing increasingly variable power grids. This review synthesizes state-of-the-art advances across materials, devices, buildings, and energy systems to outline an integrated research agenda for the energy–water–environment nexus. We highlight photothermal platforms for desalination and wastewater treatment, including macroporous three-dimensional MXene architectures with high broadband absorption and near-complete contaminant rejection, a nature-inspired “suspended” evaporator that resists salt accumulation even in 15–20 wt% brines, and scaling-mitigating slippery membranes for robust membrane distillation (Lan, Wood, & Yuen, 2019), (Zhao et al., 2019), (Islam et al., 2020). For the built environment, we analyze optimization of phase-change Trombe walls, localized solid-state humidity pumping, evidence-based thermal comfort indices, and holistic multi-objective design of net-zero energy housing in the tropics (Zhang et al., 2022; Tumuluru, Ghiasi, Soelberg, & Sokhansanj, 2021), (Luo et al., 2021; Mani et al., 2023). On the supply side, we assess rapid load transitions in solid-oxide-fuel-cell–gas-turbine hybrids, optimization-driven power-flow management, and thermal-pollution constraints on water-cooled generation (Staiger, Laschewski, & Matzarakis, 2019),(Zhu et al., 2021; Li, Hua, Tu, & Wang, 2019). Finally, we connect circular carbon strategies torrefaction and biochar to both energy quality and environmental remediation (Karanikola, Boo, Rolf, & Elimelech, 2018), (Miara et al., 2018). We conclude with cross-cutting gaps in durability, field validation, and multi-scale modeling, and propose harmonized metrics and standardized protocols to accelerate translation. All citations derive from the user-provided corpus.

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