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Yunita Djamalu
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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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PEMANFAATAN LIMBAH ORGANIK SEBAGAI ENERGI ALTERNATIF MENGGUNAKAN REAKTOR GASIFIKASI DOWNDRAFT Hasan Harun, Ervan; Ilham, Jumiati; Djafar, Romi; Djamalu, Yunita
Journal Of Renewable Energy Engineering Vol. 2 No. 2 (2024): 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.v2i2.43

Abstract

Organic waste from coconut shells, corn cobs, candlenut shells, and lamtoro wood is often found in the Gorontalo region. The gasification of organic waste has the potential to reduce organic waste and produce gas for various applications, including heating, power generation, and industrial raw materials. The research aims to determine the gas composition of the downdraft gasification process from organic waste from coconut shells, candlenut shells, corn cobs, and lamtoro wood, to determine the rate of fuel consumption, and to determine the calorific value. The method used is an experimental method. Test results using a downdraft gasifier reactor with 5 kg of fuel. The average H2 value obtained from the test results for coconut shells was 12.46%, candlenut shells 13.01%, corn cobs 9.3%, and lamtoro wood 15.95%, the highest H2 value from several of these samples was obtained from lamtoro wood with the highest percentage was 15.95%, the average O2 value obtained was coconut shell 8.86%, candlenut shell 6.37%, corn cob 2.61%, lamtoro wood 5.22%, the average CH4 value was shell coconut 7.88%, candlenut shell 4.05%, corn cob 8.03%, lamtoro wood 7.32%, average CO value for coconut shell 0.56%, candlenut shell 0.05%, corn cob 10 .71%, lamtoro wood 0.05% while the average N2 value obtained was 70.21% coconut shell, 76.49% candlenut shell, 69.25% corn cob, and 71.44% lamtoro wood. The findings compare four organic wastes as alternative energy using a downdraft gasification reactor. The conclusion from this research is that the best gas composition is from corncob organic waste with H₂, CH₄, and CO of 28.05%, the longest burning rate on corncob samples is 23.11 grams/minute and the highest calorific value test is on lamtoro wood samples with results reaching 4,340 cal/gram.
PERBANDINGAN DESAIN PENGERING BERBASIS EFEK RUMAH KACA VARIASI CEROBONG PENGHAWAAN: IMPLEMENTASI PADA MASYARAKAT LOKAL Djamalu, Yunita
Journal Of Renewable Energy Engineering Vol. 2 No. 2 (2024): 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.v2i2.45

Abstract

Greenhouse effect-based dryers are an efficient and environmentally friendly technological solution to improve the quality and added value of agricultural and fishery products. This research aims to analyze the comparative technical and economic performance of three variations of ventilation chimney designs, namely conventional, thermal, and multidirectional, in their implementation in local communities. Research methods include field experiments to measure technical parameters, such as temperature, humidity, drying time, and airflow speed, and economic analysis to calculate investment costs, payback period, and net profits. The results showed that the thermal chimney provided the best performance with an average temperature of 50°C, drying time of 21 hours, and high airflow efficiency, suitable for rural areas. Multidirectional chimneys are more flexible against unstable wind conditions, making them ideal for coastal areas. This technology is environmentally friendly with a reduction in carbon emissions of up to 1.2 tonnes of CO₂ per year per unit. The novelty of this research lies in the combination of innovative design, in-depth economic analysis, and the application of technology that is adaptive to local needs and challenges, making it relevant and beneficial to society and the environment. In conclusion, a greenhouse effect-based dryer with a ventilation chimney design is a technology that is feasible to apply to increase productivity, environmental sustainability, and the welfare of local communities.
STUDI NILAI RESITENSI ELEKTRODA PENTANAHAN MENGGUNAKAN METODE TIGA KUTUB PADA KONDISI TANAH BERBEDA Kamil Amali, Lanto Mohamad; Mento, Isnain Sarjan; Salim, Sardi; Tolago, Ade Irawati; Ntobuo, Nova Elysia; Utama, Komang Arya
Journal Of Renewable Energy Engineering Vol. 2 No. 2 (2024): 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.v2i2.47

Abstract

The grounding system serves as a safe path for electrical current to flow to the ground, which is important in preventing the risk of equipment damage and safety hazards. One of the critical parameters in this system is the resistance of the ground electrode, which can be measured using the three-point method. Based on PUIL 2000, the recommended grounding resistance value for electrical installations must be less than 5 ohms so that the system can work optimally and safely. The three-pole method is known to be accurate because it minimizes the influence of the environment around the electrode. However, factors such as soil type, humidity, and mineral content greatly influence the resistance of the ground electrode. Therefore, this study aims to evaluate the resistance of grounding electrodes in various types of soil, such as clay, swamp soil, damp sandy soil, dry soil, and rocky soil. Research results: The best grounding electrode resistance values ​​were obtained in clay and moist sandy soil (coastal). Meanwhile, the resistance value of the ground electrode for dry soil, rocky soil, and swamp soil does not meet the standard of ≤ 5 ohms. The factors that cause the resistance value of the ground electrode not to meet the standard are because in swampy soil the soil is dominated by insulating organic material and low content of conductive minerals. Also, moisture imbalance, electrode corrosion, and less-than-optimal electrode installation contribute. At the same time, dry soil and rocky soil are characterized by having a high level of resistivity due to low water and mineral content and a texture that does not support optimal electrical conductivity where field measurement results are not yet available. Meets the standard ≤ 5 Ω
STUDI RESISTANSI ELEKTRODA PENTANAHAN MENGGUNAKAN METODE TIGA KUTUP: STUDI PENGARUH BENTONIT nain, isnain sarjan mento; Amali, Lanto Mohamad Kamil; Salim, Sardi
Journal Of Renewable Energy Engineering Vol. 3 No. 1 (2025): Journal Of Renewable Energy Engineering
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i1.44

Abstract

Berdasarkan penelitian pengukuran resistansi elektroda pentanahan pada kondisi tanah berbeda dengan pengukuran normal (metode tiga kutub) dengan panjang batang elektroda tembaga dan besi 90 cm, diameter 10 mm dan kedalaman 0,4 meter dan 0,7 meter maka dapat disimpulkan: Tahanan jenis tanah berpengaruh pada nilai pentanahan. Nilai tahanan pentanahan terbaik diperoleh pada jenis tanah liat dan tanah lembab berpasir (pantai). Sedangkan nilai tahanan tanah kering dan berbatu dibutuhkan panjang dan kedalaman pada saat penelitian pengukuran tahanan pentanahan. Kedalaman penanaman batang elektroda berpengaruh pada nilai tahanan pentanahan, semakin dalam penanaman semakin kecil nilai tahanan pentanahan. Hasil pengukuran pada jenis tanah liat dan tanah lembab berpasir (pantai) mendapatkan hasil yang telah memenuhi standar ( PUIL 2000) yang menerapkan besar nilai tahanan sebesar ≤ 5 Ω. Hal ini terjadi karena pada lapisan tanah liat dan tanah berpasir (pantai) memiliki konduktivitas baik yang mampu mengalirkan arus listrik kedalam tanah dengan baik.
DESAIN DAN IMPLEMENTASI PEMBANGKIT LISTRIK SKALA PICOHIDRO BERBASIS POTENSI ALIRAN SUNGAI DI DUSUN BONTULA: PEMBANGKIT LISTRIK SKALA PICOHIDRO Amali, Kamil
Journal Of Renewable Energy Engineering Vol. 3 No. 1 (2025): Journal Of Renewable Energy Engineering
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i1.48

Abstract

Pemenuhan kebutuhan energi listrik di daerah terpencil masih menjadi tantangan besar, khususnya di wilayah dengan akses jaringan listrik yang terbatas seperti Dusun Bontula. Penelitian ini bertujuan untuk merancang dan mengimplementasikan sistem pembangkit listrik tenaga air skala kecil (Pikohidro) yang memanfaatkan potensi aliran sungai lokal sebagai sumber energi terbarukan. Metode yang digunakan meliputi survei lokasi untuk mengukur debit dan tinggi jatuh air (head), perancangan sistem mekanik dan elektrik (turbin, pipa penstock, generator, dan sistem distribusi), serta uji kinerja sistem secara langsung di lapangan. Hasil penelitian menunjukkan bahwa sistem pikohidro yang dirancang mampu menghasilkan daya listrik sebesar 750 Watt, cukup untuk memenuhi kebutuhan penerangan dasar sejumlah rumah di dusun tersebut. Implementasi sistem ini menunjukkan bahwa teknologi pikohidro dapat menjadi solusi alternatif yang berkelanjutan, ramah lingkungan, dan sesuai dengan kondisi geografis serta sosial ekonomi masyarakat pedesaan
EVALUASI KINERJA SILIKON DAN PEROVSKITE SEBAGAI BAHAN SEMIKONDUKTOR DALAM TEKNOLOGI SEL SURYA FOTOVOLTAIK Lihawa, Norman; Ahmad, Agil; ilham, Jumiati; Hidayat, Ikhsan
Journal Of Renewable Energy Engineering Vol. 3 No. 1 (2025): Journal Of Renewable Energy Engineering
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i1.53

Abstract

This study examines the performance comparison of silicon and perovskite as semiconductor materials in photovoltaic solar cell technology. Silicon is known for its long-term stability, consistent power conversion efficiency, and well-established manufacturing infrastructure. However, its high-temperature, energy-intensive production process raises concerns about cost and environmental impact. In contrast, perovskite offers high power conversion efficiency, tunable material structure, and low-temperature fabrication, but faces major challenges in environmental stability and lead-related toxicity. A literature-based approach was applied, analyzing experimental and simulation data to evaluate key parameters such as energy bandgap, efficiency, carrier mobility, and thermal durability. The analysis indicates that combining both materials in tandem configurations presents a promising strategy for developing more efficient, flexible, and environmentally friendly photovoltaic systems
Tegangan Tembus STUDI TEGANGAN TEMBUS MATERIAL ELEKTRODA DALAM MEDAN LISTRIK SERAGAM PADA MEDIUM ISOLASI UDARA: STUDI TEGANGAN TEMBUS MATERIAL ELEKTRODA DALAM MEDAN LISTRIK SERAGAM PADA MEDIUM ISOLASI UDARA Karim, Aco; Amali, Lanto Mohamad Kamil; Yasin Mohamad; Ilham, Jumiati; Ntobuo, Nova Elysia
Journal Of Renewable Energy Engineering Vol. 3 No. 1 (2025): Journal Of Renewable Energy Engineering
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i1.55

Abstract

Tegangan tembus merupakan salah satu parameter penting dalam sistem isolasi listrik yang menentukan batas kemampuan suatu medium dalam menahan medan listrik sebelum terjadi pelepasan muatan listrik (breakdown). Material elektroda yang digunakan dalam sistem bertegangan tinggi sangat mempengaruhi distribusi medan listrik dan nilai tegangan tembus yang dihasilkan. Oleh karena itu, penelitian ini dilakukan untuk mengkaji karakteristik tegangan tembus dari berbagai jenis material elektroda dalam medan listrik seragam. Studi ini secara khusus membandingkan empat jenis logam, yaitu stainless steel, aluminium, tembaga, dan kuningan, yang umum digunakan dalam aplikasi kelistrikan. Pengujian dilakukan secara eksperimental di Laboratorium Tegangan Tinggi dengan menggunakan konfigurasi elektroda bola-bola, jarum-jarum, dan pelat-pelat pada medium udara. Hasil pengujian menunjukkan bahwa material elektroda memiliki pengaruh signifikan terhadap besar tegangan tembus. Stainless steel secara konsisten menunjukkan performa terbaik dengan nilai tegangan tembus tertinggi pada semua konfigurasi, yakni 8,07 kV (bola-bola), 8,21 kV (jarum-jarum), dan 6,37 kV (pelat-pelat). Sebaliknya, tembaga menghasilkan tegangan tembus terendah, khususnya pada konfigurasi pelat-pelat sebesar 3,27 kV. Aluminium dan kuningan menunjukkan hasil yang bervariasi, namun masih di bawah performa stainless steel
PENGARUH CAMPURAN CULLET DAN GYPSUM TERHADAP KEMAMPUAN ISOLASI DIELEKTRIK TANAH LIAT SEBAGAI BAHAN ISOLATOR LISTRIK Djafar, Moh. Wahyu; Amali, Lanto Mohamad Kamil; Yusuf, Taufiq Ismail; Ntobuo, Nova Elysia
Journal Of Renewable Energy Engineering Vol. 3 No. 1 (2025): Journal Of Renewable Energy Engineering
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i1.56

Abstract

Penelitian ini bertujuan untuk meningkatkan sifat isolasi dielektrik material isolator berbahan dasar tanah liat melalui penambahan cullet dan gypsum, hal ini menjadi upaya penting bagi pengembangan material isolator yang efisien. Tanah liat, sebagai sumber daya melimpah, memiliki potensi besar namun membutuhkan peningkatan performa dielektrik. Metode eksperimental digunakan untuk membuat tujuh variasi sampel berbentuk persegi (40 mm×40 mm×10 mm) dengan proporsi cullet (5%, 10%), gypsum (5%, 10%), dan kombinasinya. Sampel diuji tegangan tembus menggunakan tegangan tinggi AC. Hasil menunjukkan bahwa penambahan cullet dan gypsum secara konsisten meningkatkan tegangan tembus, dengan kombinasi 10% cullet + 10% gypsum mencapai nilai tertinggi 43,78 kV (4,38 kV/mm). Meskipun belum memenuhi standar PLN (9,85 kV/mm), penelitian ini menginformasikan potensi aditif dalam meningkatkan performa isolasi khususnya berbahan dasar tanah liat
HYDROGEN AS A DECARBONIZATION VECTOR: A SYSTEMATIC REVIEW OF ITS POTENTIAL FOR MITIGATING ENVIRONMENTAL POLLUTION IN INDUSTRIAL AND TRANSPORTATION SECTORS muhibbudin, ismail; Mubarak, Sanni
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.v3i2.49

Abstract

The escalating global environmental crisis, largely driven by fossil fuel dependency, underscores the urgent need for sustainable alternatives. Hydrogen has emerged as a key candidate for achieving deep decarbonization in industrial and transportation sectors. This study systematically reviews 60 peer-reviewed publications from 2010–2024 to assess hydrogen’s environmental, technical, and socio-economic implications. The findings indicate that hydrogen, particularly when produced via renewable electrolysis, offers substantial emission reductions and strong synergy with fuel cell technologies, though infrastructure costs and storage challenges remain critical barriers. The paper concludes that a structured hydrogen economy could significantly enhance global sustainability, provided that supportive policies and investment frameworks are established.  
ADOPTION OF COMPRESSED NATURAL GAS (CNG) AND COMPRESSED BIOMETHANE GAS (CBG) AS ENERGY AND TRANSPORT FUELS IN NIGERIA: A REVIEW OF SAFETY, BENEFITS, AND IMPLEMENTATION STRATEGIES muhibbudin, 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.v3i2.50

Abstract

The removal of fuel subsidies in Nigeria has heightened energy and transportation costs, intensifying inflationary pressures and economic instability. To address this, adopting alternative fuels particularly Compressed Natural Gas (CNG) and Compressed Biomethane Gas (CBG) offers a pathway toward energy diversification and resilience. This review systematically synthesizes academic and technical literature, including 45 studies published between 2010 and 2024, to assess the safety, environmental, economic, and energy security implications of transitioning from petroleum fuels to CNG and CBG. Findings reveal that while CBG provides superior environmental benefits and long-term sustainability, CNG remains more cost-effective for short-term implementation. The study identifies policy, infrastructure, and technological gaps limiting adoption and concludes with targeted recommendations to guide Nigeria’s sustainable energy transition strategy.

Page 3 of 4 | Total Record : 35

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