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All Journal ARMATUR : Artikel Teknik Mesin dan Manufaktur Electrician : Jurnal Rekayasa dan Teknologi Elektro
Agus Apriyanto
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisis Perbandingan Tegangan Pada Baterai Berbahan Baku Limbah Barubara dengan Kulit Pisang sebagai Energi Alternatif arif maulana; novia utami putri; adam wisnu murti; agus apriyanto; bayu wibowo; fauzi ibrahim
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 19 No. 1 (2025)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v19n1.2773

Abstract

Evaluasi Kinerja Cooling Tower Tipe Counter Flow Mechanical Induced Draft pada Pembangkit Listrik Tenaga Panas Bumi (Studi Kasus: PT Pertamina Geothermal Energy (Tbk), Area Ulubelu, Unit 4) Agus Apriyanto; Amrul; Hadi Prayitno; Hafizd Zakiyun Al Rasyid
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 2 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i2.11089

Abstract

The cooling tower is one of the vital components in a Geothermal Power Plant (PLTP) system, functioning to cool the condensate water from the condenser before it is reused. This study aims to analyze the effectiveness of a counter flow mechanical induced draft cooling tower at PLTP Unit 4, PT Pertamina Geothermal Energy (Tbk), Ulubelu Area. The data were obtained from field measurements conducted over seven days at fourtime intervals each day. The parameters analyzed include range, approach, and effectiveness, calculated using inlet water temperature, outlet water temperature, and wet bulb temperature. The results show an average effectiveness value of 70.05%, with variations influenced by changes in range and approach values. This effectiveness is close to the design standards stated in the manufacturer’s specifications, indicating that the cooling tower operates with good performance. This analysis provides an overview of the actual equipment condition and can serve as a reference for maintenance and performance optimization in the future.
Analisis Kinerja Komprehensive Sistem Pendingin Primer terhadap Efisiensi Pembangkit Listrik Tenaga Panas Bumi Tipe Flash Steam Agus Apriyanto; Novia Utami Putri; Retno Wahyudi; Alexander Sembiring; Fauzi Ibrahim; Adam Wisnu Murti
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 19 No. 3 (2025)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v19n3.2855

Abstract

Abstract. Geothermal power plants rely heavily on the efficiency of their cooling systems to optimize overall energy conversion. This study investigates the performance of the primary cooling systems, namely direct contact condensers and mechanically induced flow cooling towers in Unit 3 of PT. Pertamina Geothermal Energy Tbk, Ulubelu Area, Lampung. Performance metrics are assessed using parameters such as range, approach, and effectiveness for the cooling tower, and thermal efficiency calculations for the condenser and steam turbine. Daily operational data were collected and analyzed. The results show that fluctuations in cooling tower effectiveness significantly affect condenser vacuum and turbine efficiency. The average actual cooling tower effectiveness is 70.06%, lower than the design effectiveness of 78%. The condenser shows an average thermal efficiency of 93.80%, with effectiveness variations between 83.23% to 86.44%. The turbine efficiency based on design is 87.51%, while the actual efficiency drops to the range of 81.84% to 82.48%. This decrease indicates a performance degradation of approximately 0.94% per year. This finding underlines the important role of cooling system optimization in improving the performance of geothermal power plants.
Evaluasi Efektivitas Kondensor Direct Contact Tipe Jet Spray pada PLTP Unit 4 Area Ulubelu Agus Apriyanto; Hafidz Zakiyun Alrasyid
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 20 No. 3 (2026)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v20n3.3188

Abstract

Indonesia has very large geothermal potential; however, its utilization is still not optimal. One of the important components affecting the performance of a Geothermal Power Plant (PLTP) is the condenser, particularly the jet spray direct-contact condenser, which functions to condense turbine exhaust steam while maintaining system vacuum conditions. This study aims to determine the condenser effectiveness and analyze the influence of steam heat capacity on condenser performance at PLTP Unit 4 PT Pertamina Geothermal Energy Area Ulubelu. The research method was conducted through the collection of field operational data, calculation of thermodynamic parameters, and analysis of condenser effectiveness based on the heat transfer relationship between steam and cooling water. The analysis results show that condenser effectiveness is influenced by steam heat capacity and cooling system operating conditions, which directly affect the condenser’s ability to reduce turbine exhaust steam temperature and maintain system vacuum. Increasing condenser effectiveness contributes to optimizing plant performance and reducing operational costs. Therefore, evaluating condenser effectiveness is an important step in maintaining the reliability and efficiency of geothermal power plant operations.
Design and Implementation of a Dual Axis Solar Tracker System Based on Arduino Uno for Solar Power Plants (PLTS) on Fishing Boats (Case Study: Sukajaya Lempasing, Teluk Pandan District, Pesawaran, Lampung) Novia Utami Putri; Agus Apriyanto; Fauzi Ibrahim; Retno Wahyudi; Alexander Sembiring; Adam Wisnu Murti; sasmita; iqbal shofwan
Electrician : Jurnal Rekayasa dan Teknologi Elektro Vol. 20 No. 3 (2026)
Publisher : Department of Electrical Engineering, Faculty of Engineering, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/elc.v20n3.3221

Abstract

The use of electrical energy on fishing boats in Sukajaya Lempasing still relies on gasoline-fueled generators, resulting in high operational costs. Meanwhile, the potential for solar energy in the area is quite large, but the use of solar panels is still unable to capture sunlight optimally because it cannot follow changes in the sun's position. To overcome this problem, this study developed a dual-axis solar tracker system based on Arduino UNO that allows the panel to move following the direction of sunlight both horizontally and vertically. Based on the results of testing for five days, the system was able to produce an average voltage of 14.79 V, an average current of 3.85 A and an average power of 56.9 W according to the principle in equation 2. The total energy obtained each day reached 575.74 Wh and was able to fully charge a 12 V 35 Ah battery in approximately 7 hours in sunny conditions. The stored energy was used to power LED lights through an inverter with an average power of 12.89 W and a usage duration of 10-11 hours at night. These results prove that dual-axis solar trackers can increase the effectiveness of solar energy absorption and reduce the use of generators on fishing vessels, making them more economical and environmentally friendly.
Co-Authors Adam Wisnu Murti Alexander Sembiring Alexander Sembiring Amrul Arif Maulana Bayu Wibowo Fauzi Ibrahim Fredinan Yulianda Hadi Prayitno Hafidz Zakiyun Alrasyid Hafizd Zakiyun Al Rasyid Ibrahim, Fauzi iqbal shofwan Novia Utami Putri Novia Utami Putri Retno Wahyudi Sasmita Siti Kamsyiati