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Yunita Djamalu
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ANALISIS KINERJA TRANSMISI SISTEM PEMBANGKIT LISTRIK TENAGA MINI HIDRO (PLTM) DESA TALUDA’A KABUPATEN BONE BOLANGO Abdul Rahim; Burhan Liputo; Romi Djafar; Yunita Djamalu
Journal Of Renewable Energy Engineering Vol. 1 No. 2 (2023): 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.v1i2.22

Abstract

The Mini Hydro Power Plant (PLTM) is an electricity facility located in Ilohuuwa Village, Bone District, Bone Bolango Regency, Gorontalo Province, using the irrigation channels of the Taludaa River and the Iya River. In the working area of ​​PT. PLN (Persero) Sultenggo Region, Gorontalo Branch. PLTM Taludaa Unit I always plans its operating system to obtain maximum electricity production according to targets every year. However, every generator will generally experience many problems with airflow and components that hinder the process of using electrical energy so that it can grow. The analysis results show that the transmission used is a shaft that is 3M long, and the post weighs 83 kg. The shaft is the transmission link from the turbine to the generator. Then, with the flywheel, it is just balancing the rotation or (Balancing) with a flywheel weight of 76 kg and the moment of inertia that is considered. It is 121.60kg/m2. Then, with the bearing resistance, the bearing life has been calculated based on the load and rotation speed. The greater the load and rotation speed, the smaller the bearing life. The results obtained are 14.5457 working hours, 6060 per day, 119 per month, and 16.6 per year, so it defines the bearing life as being able to last 16.6 years. The turbine efficiency result is 0.94, calculated using the data specifications in the Taluda'a PLTM or (MANUAL BOOK). Then, the results obtained by KW every day depend on the air flow entering the turbine. Calculated using specifications, it can produce 991.2 Kw per 1 unit. Meanwhile, the Taluda'a PLTM uses two teams, so the Kwh made is 991.2 Kw x2, calculated using the Taluda'a PLTM specification data. Evaluation of the average net capacity from 2022 to 2023 experiences an increase and decrease in Kwh produced due to the rainy and dry seasons.
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.
SIMULATOR BOILER HYBRID SEBAGAI FUNGSI PENGERING DAN PENGOLAH LIMBAH MEDIS JENIS PLASTIK Liputo, Burhan; Djamalu, Yunita; Umela, Syaiful; Gobel, Leni; Djafar, Romi
Journal Of Renewable Energy Engineering Vol. 2 No. 1 (2024): Journal Of Renewable Energy Engineering (April)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v2i1.23

Abstract

The hybrid boiler simulator is a simulation machine designed with two working functions, namely as a medical waste processing function and as a drying cabinet function. As a medical waste processor, this machine will focus on plastic medical waste, and as a dryer function, this machine will be a clothes-drying tool or cabinet. So based on the multifunctionality of the machine, this system has hybrid working characteristics. Hybrid boiler simulators can be a solution, providing the function of processing plastic medical waste and providing the advantageous function of economical and environmentally friendly drying. Therefore, this research aims to create a hybrid boiler simulator that can be used as a plastic medical waste processing machine and also as a clothes drying machine. The hybrid boiler system is designed by applying the concept of appropriate technology so that its implementation can be done easily and practically. The research implementation method is a classification of plastic medical waste, concept design, and analysis, construction design of a hybrid boiler system combined with an incinerator for burning medical waste, system function testing, and observation of test data. The focus of his research is the heat of burning plastic waste, heat radiation, circulators, and flow control systems as well as the characteristics of the results of burning plastic waste. The results of this research are that the hybrid boiler simulator machine can function as an incinerator machine to burn plastic medical waste and function as a clothes dryer; The function of the incinerator in this machine is only through two processes, namely the process of burning plastic medical waste raw materials and the process of burning carbon gas or smoke produced from the process of burning raw materials; the sumulator machine is not yet equipped with a fogging process for the function of smoke cleaning filter and fogging control; the hybrid boiler simulator machine works on the principle of automatic control based on temperature detection using a temperature sensor; The combustion temperature in the boiler machine can be controlled at a standard of 830 °C and the drying room temperature can be set at a room temperature of 50 – 150 °C.
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.
PEMANFAATAN MESIN PENCACAH UNTUK MEMPERCEPAT PEMOTONGAN JERAMI SEBAGAI MEDIA PERTUMBUHAN JAMUR TIRAM Yunita Djamalu; Burhan Liputo; Romi Djafar
Jurnal Abdimas Terapan Vol. 2 No. 1 (2022): JURNAL ABDIMAS TERAPAN (NOVEMBER)
Publisher : Program Vokasi Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (262.436 KB) | DOI: 10.56190/jat.v2i1.17

Abstract

Tujuan dari pengabdian ini yaitu untuk mengaplikasikan hasil penelitian tentang alat pencacah jerami sebagai media pertumbuhan jamur tiram. Kegiatan pengabdian ini dilaksanakan pada bulan Agustus 2022 sebagai pengaplikasian hasil penelitian terdahulu. Pengabdian ini bertempat di Lokasi KTH Tunas Berkah Desa Jatimulya, Kecamatan Wonosari, Kabupaten Boalemo, Provinsi Gorontalo. Metode yang digunakan dalam pengabdian ini yaitu dengan metode pemaparan, pelatihan dan tanya jawab. Hasil kegiatan menunjukan bahwa penggunaan alat pencacah jerami sangat bermanfaat karena ukuran jerami yang dihasilkan dari pencacahan dapat disesuaikan dengan kebutuhan yaitu 3-5 cm. selain itu proses pencacahan menjadi lebih efisien.
PEMANFAATAN PENGERING EFEK RUMAH KACA DALAM MENINGKATKAN KUALITAS KERUPUK KASUBI LONUO BUKIT ARANG Fuad Pontoiyo; Burhan Liputo; Yunita Djamalu
Jurnal Abdimas Terapan Vol. 4 No. 1 (2024): JURNAL ABDIMAS TERAPAN (NOVEMBER)
Publisher : Program Vokasi Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jat.v4i1.61

Abstract

Lonuo Village is located in Tilongkabila District, Bone Bolango Regency, Gorontalo. Kasubi crackers are a typical snack produced by one of the Lonuo Bukit Arang Kasubi Crackers UKMs. Kasubi crackers are made from cassava, tapioca flour, baking soda, and brown sugar, while other production requirements are cooking oil, LPG gas, gasoline, firewood, raffia rope, and plastic packaging. Meanwhile, other supporting tools in the kasubi cracker production process are plastic plates, steamer frames, steaming pans, molding tanks, sweet potato grinding machines, and para-paras as attachments for manual drying. The manual drying place used by IKM consists of 3 bamboo-based lamps measuring 7 x 13 meters for the entire cracker drying place. The drying process using bamboo sheets has many disadvantages, including drying time which takes 4 to 5 drying hours in sunny weather, unpredictable weather, less hygienic, and tends to be contaminated with bacteria because the location of the IKM is opposite the location of the Final Processing Site (TPA) for waste disposal. Bone Bolango Regency. The Kasubi Lonuo Bukit Arang cracker IKM was established in 2000 and has been continued by Santian Pillow since 2020. This IKM has more than 6 (six) permanent and non-permanent employees with daily raw material production of 1 () sack of cassava Working time from grating the coconut to drying takes 8 to 9 hours, namely from 08.00 to 15.00 WITA with the resulting cracker output being 2448 crackers per day and packaged in one hanging containing 10 crackers and priced at IDR. 11,000 per hanging. The method used in this activity is the preparation stage, implementation of activities, and program sustainability plans. The alternative drying tool that will be socialized in this activity is a greenhouse drying tool in the form of a rectangular prism with the help of energy from sunlight. While serving this community group, the service team packages activities from lecture presentations on introducing tools, questions, and answers, how to make tools, how to use tools, and how to maintain tools. From the results of this activity, it was agreed that the next activity would focus more on making cracker products using biomass stoves or stoves fueled by used oil and greenhouse effect dryers.
SISTEM PENGERING HIBRIDA BERBASIS IOT DENGAN PENYIMPANAN PANAS UNTUK OPTIMALISASI ENERGI, KUALITAS PRODUK, DAN REDUKSI DAMPAK LINGKUNGAN TERMAL: ARTIKEL REVIEW Yunita Djamalu; Romi Djafar; Arifin Matoka
Journal Of Renewable Energy Engineering Vol. 4 No. 1 (2026): Journal Of Renewable Energy Engineering (April)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v4i1.65

Abstract

Post-harvest drying remains a critical point in the agricultural commodity value chain as it determines the rate of moisture loss, physical-chemical quality, microbiological stability, energy consumption, and environmental emissions. In the last decade, the direction of technology development has shifted from passive solar dryers to hybrid drying systems that combine greenhouses, solar collectors, thermal energy storage, auxiliary heat sources, and Internet of Things (IoT)-based monitoring and control. This review article reorganizes and updates the literature on IoT-based hybrid drying systems, focusing on five key dimensions: system architecture, heat storage media, intelligent monitoring and control, drying performance and kinetics, and economic and environmental implications. The synthesis shows that hybrid configurations consistently increase drying chamber temperature, improve heat distribution uniformity, shorten drying time, and maintain product quality compared to open drying or non-hybrid systems. The integration of sensible, latent, or a combination of both has been shown to extend the drying period during periods of decreased solar radiation and stabilize the thermal conditions of the process. At the same time, IoT enables real-time monitoring of temperature, relative humidity, airflow velocity, and equipment safety status, opening the door to more adaptive predictive control. From a sustainability perspective, recent literature shows that hybrid systems can reduce conventional energy consumption, improve exergy indicators, and deliver economic benefits through operational cost savings and potential reductions in carbon emissions. This review emphasizes that future research agendas must move beyond simply increasing drying temperatures to multi-objective optimization that integrates product quality, energy efficiency, control reliability, and environmental impact.  
EVALUASI FAKTOR KERUSAKAN MODUL SURYA DAN DAMPAKNYA TERHADAP KINERJA SISTEM PLTS 2 MWP SUMALATA GORONTALO Rehan Mukmin; Yunita Djamalu; Arifin Matoka; Aswin
Journal Of Renewable Energy Engineering Vol. 4 No. 1 (2026): Journal Of Renewable Energy Engineering (April)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v4i1.82

Abstract

The performance of a solar power plant (SPP) is significantly influenced by the condition of the solar modules, which are the primary components in the energy conversion process. Damage to the modules can lead to a decrease in efficiency and disrupt the stability of the power generation system. This study aims to identify the types and characteristics of solar module damage, analyze the dominant contributing factors, and evaluate their impact on the performance of the 2 MWp Sumalata SPP system in North Gorontalo. The method used is quantitative descriptive analysis with a direct field inspection approach, supported by operational data in the form of the number of damaged modules and inverter power output. The research findings indicate that PV module damage is primarily caused by burnt modules and a combination of cracked and burnt modules, as well as the occurrence of hotspots due to environmental and technical factors. Based on the inspection summary for the January–December 2025 period, a total of 507 damaged modules were recorded, comprising 238 modules on Transformer 1 and 269 modules on Transformer 2; indications of performance degradation were also found in the form of low open-circuit voltage (Voc) values in some modules. The impact of the damage is evident in the reduction of inverter output power and the potential decrease in daily energy production. On December 2, 2025, with an irradiance of 6.80 kWh/m², inverter number 41, with 22 damaged modules, produced 17.942 kW of power, which was lower than inverters 35–40, which were in the range of 18.4–20.74 kW. These results indicate that solar panel damage directly impacts the overall performance of the PV system, particularly in terms of generation efficiency and power output stability.
Rancang Bangun Alat Pemotong Lontong Kerupuk Menggunakan Tali Senar Eska Hiola; Evi Sunarti Antu; Yunita Djamalu
JTPG (Jurnal Teknologi Pertanian Gorontalo) Vol 1 No 1 (2016): Jurnal JTPG (Mei)
Publisher : PROGRAM STUDI MESIN DAN PERALATAN PERTANIAN

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kerupuk merupakan salah satu makanan ringan khas Indonesia yang banyak disukai oleh masyarakat dari berbagai kalangan. Salah satu tahapan pengolahan pada pembuatan kerupuk adalah tahapan pemotongan, namun selama ini tahapan pemotongan pada dodolan mentah lebih banyak dengan menggunakan alat manual (pisau) dengan ketebalan yang dihasilkan tidak seragam dan kapasitas yang sedikit. Alat pemotong lontong kerupuk manual adalah suatu alat tepat guna yang dapat mempercepat dan mempermudah proses pemotongan. Pada alat pemotong lontong kerupuk tersebut hasil pemotongannya seragam. Desain alat pemotong secara manual manual menggunakan mata pisau baja dari tali senar mampu memotong lontong kerupuk lebih efektif dari segi keseragaman tebal dan lebih efisien dari segi waktu. Hasil pengujian alat pemotong lontong kerupuk secara manual dilakukan pada lontong kerupuk dengan berat 1,3 ons, panjang lontong 35 cm dan berdiameter 30 mm membutuhkan waktu 25,4 detik dengan ketebalan kerupuk yang terpotong adalah 2-3 mm, kapasitas efektif adalah 175,4 ons/detik.
Co-Authors Abdul Rahim Arifin Matoka Aswin Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Dayuwanto Harun Dimas Ishak Eska Hiola Evi Sunarti Antu Fitriyan Giu Fuad Pontoiyo Gobel, Leni Haris Abdullah Hariyanto Upingo Upingo Harlan Djabal Harun Doe Hasan Harun, Ervan Hendra Pangalima Iqrima Staddal Jamhari Jamhari Jefrin H. Antungo Jumiati Ilham Lanto Mohamad Kamil Amali Liputo, Burhan Mahmud Bahsoan Max Kurniawan Moch. Sabri Entengo Mohamad Rizki Buheli Muhammad Zahri Abdul Rahim Rehan Mukmin Riklan Tahapali Rion Djafar Romi Djafar Roys Pakaya Sahlan Buako Satria Wati Pade Siradjiddin Haluti Siradjuddin Haluti Siti Fauziah Sjahril Botutihe Sunandar Udjaili Syamsu Akuba Udjaili, Sunandar Umela, Syaiful Wahyudin van Gobel Zulkifli Ismail Zulzain Ilahude  Abd. Karman