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All Journal Rekayasa Mesin Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Ikhsan, Alfikri
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Aerospace Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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IMPLEMENTASI STOKASTIK PADA INVESTIGASI PENGARUH I/D TERHADAP PERILAKU ANTARMUKA ALIRAN BERLAWANAN ARAH DI GEOMETRI 1/30 HOT LEG PWR MENGGUNAKAN SENSOR KONDUKTANSI Astyanto, Achilleus Hermawan; Rasyidi, Muchsin Muzafar; Nugroho, Akhlisa Nadiantya Aji; Ikhsan, Alfikri; Saleh, Dede Rafico
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1531

Abstract

A small leakage in the primary circuit of a nuclear power plant reactor may trigger the occurrence of countercurrent flow which probably develops into a flooding regime followed by the zero penetration caused core cooling failure. During extensive studies in the flooding phenomena in the PWR hot leg, the geometry effects have been widely investigated. The present study investigates the effects of I/D ratios of the riser on the interfacial fluctuations during the counter-current flow on a 1/30 scaled down PWR hot leg geometry. Here, the liquid film fluctuations were acquired by using parallel wire array probes on the basis of a conductance concept. Three I/D ratios which were varied consisted 1.9 (R1), 3.9 (R2) and 8.3 (R3). The obtained data were analyzed on the basis of both time and frequency domains. From the PDF the flooding regime obtains multimodal distributions, while the PSD approaches lower frequencies with higher magnitudes corresponding to either the occurrence of water blockage or slugs. Keywords: I/D ratio, water level fluctuation, counter-current flow, PWR hot leg, parallel wire array probe, stochastic analysis.
Evaluation of Solar Energy Potential in Bojakan Village, Mentawai Islands Using PVGIS Simulation Ikhsan, Alfikri
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.544

Abstract

Electricity access remains highly uneven in Indonesia, especially in remote and underserved island regions such as the Mentawai Islands in West Sumatra. Bojakan Village, located in North Siberut District, is one of several communities still lacking electricity from the national utility grid (PLN). In response to this challenge, this study explores the technical feasibility of deploying solar photovoltaic (PV) systems as a renewable energy solution. Using hourly simulation data for a standard 1 kWp PV system from the Photovoltaic Geographical Information System (PVGIS), developed by the Joint Research Centre (JRC), energy production was analyzed over a three-year period (2021–2023). The data were processed in MATLAB to assess daily output, seasonal fluctuations, and average performance. Findings show that the PV system produces an average of 3.64 kWh/day. To meet the village’s projected electricity demand by 2031, a system with a capacity of approximately 49.7 kWp would be required, occupying a ground area of around 1,093.4 m². The results indicate that Bojakan holds sufficient solar potential for a sustainable off-grid energy system, subject to further technical and socio-economic considerations.
IMPLEMENTASI STOKASTIK PADA INVESTIGASI PENGARUH I/D TERHADAP PERILAKU ANTARMUKA ALIRAN BERLAWANAN ARAH DI GEOMETRI 1/30 HOT LEG PWR MENGGUNAKAN SENSOR KONDUKTANSI Astyanto, Achilleus Hermawan; Rasyidi, Muchsin Muzafar; Nugroho, Akhlisa Nadiantya Aji; Ikhsan, Alfikri; Saleh, Dede Rafico
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1531

Abstract

A small leakage in the primary circuit of a nuclear power plant reactor may trigger the occurrence of countercurrent flow which probably develops into a flooding regime followed by the zero penetration caused core cooling failure. During extensive studies in the flooding phenomena in the PWR hot leg, the geometry effects have been widely investigated. The present study investigates the effects of I/D ratios of the riser on the interfacial fluctuations during the counter-current flow on a 1/30 scaled down PWR hot leg geometry. Here, the liquid film fluctuations were acquired by using parallel wire array probes on the basis of a conductance concept. Three I/D ratios which were varied consisted 1.9 (R1), 3.9 (R2) and 8.3 (R3). The obtained data were analyzed on the basis of both time and frequency domains. From the PDF the flooding regime obtains multimodal distributions, while the PSD approaches lower frequencies with higher magnitudes corresponding to either the occurrence of water blockage or slugs. Keywords: I/D ratio, water level fluctuation, counter-current flow, PWR hot leg, parallel wire array probe, stochastic analysis.
Co-Authors Achilleus Hermawan Astyanto Nugroho, Akhlisa Nadiantya Aji Rasyidi, Muchsin Muzafar Saleh, Dede Rafico