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Designing IoT-Based Brackish Water Desalination Equipment to Meet Drinking Water Needs in Coastal Areas Rimbawati - Rimbawati; Darwin Darwin; Rahmanda Syahputra; Almira Amir; Dultudes Mangopo
JET (Journal of Electrical Technology) Vol 11, No 1 (2026): EDISI FEBRUARI
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/jet.v11i1.13378

Water is one of the main sources that are very important for the needs of living beings. Water that has too high salinity can cause harm if used for certain activities, for example, it is harmful to health when used as drinking water, causing crop failure for agriculture, corrosion of equipment and buildings made of metal elements. The process of treating brackish water into fresh water is known as desalination. Brackish water treatment can also be done by filtration method. Based on the above background to avoid risks that occur in the use of brackish water in daily life that does not meet the standards of clean water that is safe to use in general and always ensures that the water is still suitable for use, this study designed and built a solenoid valve control system as an automatic valve used for the desalination of ready-to-drink brackish water that is safe and suitable for use in daily life and also has access to monitoring uses the internet of things (IoT) in its operation, so that it can be optimal in monitoring the pH of water and tds in the water as well as the water capacity in the water tank storage in real time by using Arduino uno as a data processor and the esp8266 wifi module for a connection to the internet that will send data to the blynk application. In the design of this device, several sensors were used, such as: pH sensor, tds sensor, and ultrasonic sensor so that it has three outputs, namely water tank storage capacity, water tds value, and water pH placed in the water tank storage to determine the value of the final result in the process of processing brackish water into ready-to-drink water in this study. The results of the work test of this brackish water desalination control system succeeded in removing the color and odor in the water and were able to change the pH level in brackish water from 8.7 pH to 6.43 pH, but the filtered water still tasted salty, so this research still needs to be continued to achieve the standard of drinking water content

Experimental study of engine performance using a blend of RON 90 gasoline and fractionated gasoline equivalent from plastic pyrolysis oil Bisrul Hapis Tambunan; Janter P. Simanjuntak; Sahala Siallagan; Bonaraja Purba; Rimbawati Rimbawati; Nurin Wahidah Mohd Zulkifli; Mohd Kamal Kamarulzaman
SINERGI Vol. 30 No. 2 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.2.016

This study investigated the performance and emission characteristics of a gasoline engine using a blend of commercial gasoline RON 90 and fractionated plastic pyrolysis oil (PPO). Almost all previous studies used unfractionated PPO in engine performance tests. The use of raw PPO in engine performance tests will result in poor engine performance, because the physicochemical properties of the fuel do not meet engine requirements and the ASTM D4814 standard (gasoline fuel properties standard). An innovative aspect of this study is that the raw PPO was first fractionated to separate the gasoline PPO fraction, the diesel PPO fraction, and other aromatic fractions. Gasoline-equivalent PPO was used in the engine performance test to ensure the fuel used met engine specifications. PPO is obtained from post-consumer plastic waste through a pyrolysis process, followed by fractionation to separate heavy fractions and complex aromatic compounds. Blends containing up to 40% fractionated PPO were tested to evaluate their effects on engine performance and emissions. Experimental results showed that the use of 40% PPO only reduced thermal efficiency 0.79%, which is very low compared to the results of previous studies. In terms of emissions, the use of a 40% fractionated PPO blend reduced CO emissions by 7%, reduced HC by 17%, and increased CO2 by 17%. The reduction in CO2 and HC emissions is an innovative aspect of this study. These findings differ from previous studies using raw PPO, which reported significant engine performance degradation and increased emissions due to poor combustion characteristics.

Designing IoT-Based Brackish Water Desalination Equipment to Meet Drinking Water Needs in Coastal Areas Rimbawati - Rimbawati; Darwin Darwin; Rahmanda Syahputra; Almira Amir; Dultudes Mangopo
JET (Journal of Electrical Technology) Vol 11, No 1 (2026): EDISI FEBRUARI
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/jet.v11i1.13378

Water is one of the main sources that are very important for the needs of living beings. Water that has too high salinity can cause harm if used for certain activities, for example, it is harmful to health when used as drinking water, causing crop failure for agriculture, corrosion of equipment and buildings made of metal elements. The process of treating brackish water into fresh water is known as desalination. Brackish water treatment can also be done by filtration method. Based on the above background to avoid risks that occur in the use of brackish water in daily life that does not meet the standards of clean water that is safe to use in general and always ensures that the water is still suitable for use, this study designed and built a solenoid valve control system as an automatic valve used for the desalination of ready-to-drink brackish water that is safe and suitable for use in daily life and also has access to monitoring uses the internet of things (IoT) in its operation, so that it can be optimal in monitoring the pH of water and tds in the water as well as the water capacity in the water tank storage in real time by using Arduino uno as a data processor and the esp8266 wifi module for a connection to the internet that will send data to the blynk application. In the design of this device, several sensors were used, such as: pH sensor, tds sensor, and ultrasonic sensor so that it has three outputs, namely water tank storage capacity, water tds value, and water pH placed in the water tank storage to determine the value of the final result in the process of processing brackish water into ready-to-drink water in this study. The results of the work test of this brackish water desalination control system succeeded in removing the color and odor in the water and were able to change the pH level in brackish water from 8.7 pH to 6.43 pH, but the filtered water still tasted salty, so this research still needs to be continued to achieve the standard of drinking water content

Development of Non-Conventional Energy Systems as a Source of Electric Power for Alternators PARTAONAN HARAHAP; RIMBAWATI RIMBAWATI; CHOLISH CHOLISH; ABDULLAH ABDULLAH; JOKO ARIF SETIAWAN
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 13, No 4: Published November 2025
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v13i4.354

This Development of a Non-Conventional Energy System as a Power Source for an Alternator aims to design an efficient and self-sustaining power generation system. The study focuses on the drive mechanism, rotor speed synchronization, and excitation current analysis to achieve optimal electrical output. Experimental results indicate peak performance at 4000 RPM with an induced voltage of 1539 V (star configuration) and a rectified DC output of 14 V. An excitation current of 7 A produced an electromagnetic torque of 2.44 Nm, ensuring stable operation. The developed system demonstrates efficiency, stability, and potential for future energy-independent vehicle applications.

Rancang Bangun Prototype Exhaust Fan Otomatis untuk Menstabilkan Udara pada Ruangan Bebas Asap Benny Oktrialdi; Rahmat Fauzi Siregar; Arya Rudi Nasution; Rimbawati Rimbawati; Faisal Irsan Pasaribu; Indra Roza
Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer Vol. 16 No. 2 (2025): JURNAL SIMETRIS VOLUME 16 NO 2 TAHUN 2025
Publisher : Fakultas Teknik Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/simet.v16i2.15261

Ruangan adalah tempat tertutup yang sering digunakan oleh manusia untuk dijadikan sebagai tempat tidur, kerja atau bahkan tempat menyimpan barang-barang yang sudah tidak di gunakan lagi. Dalam kehidupan sehari-hari,tidak sedikit manusia yang lebih memilih menghabiskan waktunya hanya berada di ruangan saja, karena adanyaÂ kenyamanan. Sistem exhaust fan otomatis berdasarkan sensor MQ02 dan LM35 dirancang untuk menstabilkan kondisi udara di dalam ruangan. Sensor MQ02 digunakan untuk mendeteksi konsentrasi asap tertentu dalam udara, sementara sensor LM35 digunakan untuk mendeteksi suhu ruangan. Ketika konsentrasi asap atau suhu melebihi ambang batas yang ditentukan, sistem akan mengaktifkan exhaust fan untuk mengeluarkan udara dari ruangan, sehingga menjaga kualitas udara dan suhu ruangan tetap optimal. SistemÂ ini dirancang dengan menggunakan mikrokontroler atau modul kontrol seperti Arduino untuk mengatur operasi exhaust fan berdasarkan pembacaan sensor. Pengujian dilakukan untuk memastikan respons sistem terhadap perubahan kondisi udara, dan pemeliharaan rutin diperlukan untuk menjaga kinerja system tetap optimal. Sistem ini dapat menjadi solusi efektif untuk meningkatkan kualitas udara di dalam ruangan dengan cara yang otomatis dan efisien. Perancangan alat ini berhasil dilakukan dan hasil pengujian menunjukkan alat mampu mendeteksi konsentrasi asap dan temperatur sesuai dengan kondisi yang diinginkan.

Blade curvature as a key driver of conical-basin gravitational vortex turbine performance: experimental evidence Andianto Pintoro; Himsar Ambarita; Farel Hasiholan Napitupulu; Tulus Burhanuddin Sitorus; Taufiq Bin Nur; Ilmi Abdullah; Rimbawati Rimbawati
SINERGI Vol. 30 No. 3 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.3.001

This study investigates the role of runner blade curvature in enhancing the performance of Gravitational Water Vortex Turbines (GWVTs) for low-head hydropower applications. Despite growing interest in GWVT technology, previous studies typically vary multiple geometric parameters simultaneously, leaving the isolated effect of blade curvature radius insufficiently understood. To address this research gap, an experimental investigation was conducted using a conical-basin GWVT with three runner configurations having identical blade inclination (66°) but different curvature radii (0.10 m, 0.20 m, and 0.30 m). Experiments were performed under controlled flow rates of 800, 1025, and 1300 LPM. Turbine torque, rotational speed, mechanical power, and efficiency were measured using a Prony brake dynamometer and magnetic tachometer. Each test condition was repeated three times, and the resulting data were analyzed using mean and standard deviation analysis to ensure measurement reliability and experimental consistency. The results show that increasing blade curvature significantly improves hydrodynamic interaction between the vortex flow and the runner. The runner with a curvature radius of 0.30 m achieved the best performance, producing a peak torque of 15.92 Nm, mechanical power of 109.95 W, and maximum efficiency of 66.43% at moderate flow conditions. The findings establish a direct curvature-performance relationship, demonstrating that larger curvature enhances tangential momentum transfer, prolongs blade-vortex interaction, and improves torque generation in low-head vortex systems. This study empirically confirms blade curvature as the key parameter governing hydrodynamic coupling and energy extraction in GWVT runners, while providing a practical design guideline to improve efficiency in low-head decentralized micro-hydropower systems.

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