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All Journal Transmisi Sinergi Polmed : Jurnal Ilmiah Teknik Mesin
Widiharsa, Fransiskus Asisi
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Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Comparison of the Performance of Mini Generator Water Turbines in Series and Parallel Flow Systems Kriswidijatmoko, Mikael Adi; Hariyanto, Rudi; Widiharsa, Fransiskus Asisi
TRANSMISI Vol 19, No 2 (2023): September 2023
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i2.12079

Abstract

The need for electricity is crucial in modern life, but the depletion of fossil fuel resources and their negative impact on the environment has led to the need for alternative, sustainable, and renewable energy sources. One of the most widely used renewable energy sources is hydro energy, which can be harnessed through the use of water turbine generators. This research aims to design, prototype, and test the performance of a mini-series and parallel water turbine generator system with a 24-volt system. Furthermore, this research will evaluate the difference in performance between the series and parallel systems and analyze the efficiency of the mini-series and parallel water turbine generator system. The focus of this research is on the efficiency of the water turbine generator system with variations in water flow, but it does not cover large-scale industrial applications. This research aims to provide sustainable and environmentally friendly energy sources as an alternative to conventional energy sources. The results of this research can serve as a reference for researchers and practitioners interested in the development of renewable energy sources, particularly water turbine generators. In the testing, the Series Turbine Series Generator system with a water flow rate of 6.38 L/min produced a maximum power of 2.43 watts, while the Parallel Turbine Series Generator system with a water flow rate of 13.01 L/min produced a maximum power of 2.142 watts. The efficiency ratio between the Series Generator and Parallel Generator is 1.5, with the Series Generator achieving a maximum efficiency of 38.6% in the Series Turbine Series Generator system, and the Parallel Generator achieving a maximum efficiency of 25.3% in the Series Turbine Parallel Generator system.
OPTIMASI KINERJA FURNACE PELEBURAN ALUMINIUM MELALUI APLIKASI CERAMIC FIBER SEBAGAI MATERIAL ISOLASI TERMAL Hariyanto, Rudi; Kurniawan, Pradhana; Widiharsa, Fransiskus Asisi; Widyastuti, Ike; Lestari, Dicky Candra
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 2 (2025): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v6i2.2331

Abstract

Proses peleburan alumunium membutuhkan kalor setara temperatur 660°C. Selama proses peleburan, energi panas di ruang peleburan mengalami kerugian berupa perpindahan panas secara konduksi, melalui dinding furnace  ke lingkungan. Agar proses peleburan logam bisa berjalan efektif, maka penting memilih bahan dinding furnace yang mampu meredam kerugian kalor. Penelitian ini membahas perbandingan unjuk kerja furnace peleburan alumunium berdasar perbandingan perpindahan panas secara konduksi yang terjadi pada dinding furnace peleburan antara yang menggunakan dan tanpa menggunakan isolator berupa lapisan ceramic fiber. Dinding furnace dibuat dari bahan semen tahan api dengan ketebalan 3 cm. Adapun tebal lapisan ceramic fiber yang digunakan  5 cm. Hasil pengujian perbandingan tanpa dan menggunakan ceramic fiber adalah temperatur ruang peleburan tertinggi yang tanpa (TinS) = 394°C dan yang menggunakan (TinSc) = 616°C.  Temperatur luar dinding furnace tertinggi yang tanpa (Touts) = 127°C dan  yang menggunakan (Toutsc) = 61°C.  Nilai perubahan panas furnace berdasar perbandingan pada temperatur dinding dalam dan dinding luar furnace menunjukkan furnace yang menggunakan lapisan ceramic fiber menghasilkan nilai 1,72 kali lebih tinggi. Adapun perbandingan pemanfaatan kalor bahan bakar untuk peleburan adalah dari 0,615% untuk furnace tanpa lapisan ceramic fiber menjadi 1,26% untuk dinding furnace dengan lapisan ceramic fiber. Unjuk kerja furnace yang menggunakan ceramic fiber sebagai lapisan dinding furnace mampu meningkatkan unjuk kerja furnace peleburan alumunium 2 (dua) kali lebih baik dibanding dinding furnace tanpa dilapisi keramic fiber.
Co-Authors Caska - Kriswidijatmoko, Mikael Adi Kurniawan, Pradhana Lestari, Dicky Candra Rudi Hariyanto Widyastuti, Ike