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All Journal Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin
Raharjo, Bambang
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Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Plastic Waste Management through Pyrolysis in the Seribu Islands: Energy Efficiency and Fuel Oil Production Analysis Raharjo, Bambang; Winanda, Aryan; Triwinanto, Puguh; Firdhaus, Taufan; Nursiwan; Prawoto; Maulana, Eka
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol. 15 No. 1 (2025): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/teknobiz.v15i1.8554

Abstract

Plastic waste in the Seribu Islands has become a significant issue threatening marine and coastal ecosystems. This study analyzes the conversion of plastic waste into diesel fuel through pyrolysis, employing three scenarios of plastic mixture ratios: LDPE and PP, PET, PS, and HDPE. With operating temperatures of 400 °C, 480 °C, and 550 °C, the research evaluates energy efficiency, diesel output, and return on investment (ROI). Results indicate that a mixture of 50% LDPE and PP, 15% PET, 10% PS, and 25% HDPE at 550 °C produces the highest diesel yield of 0.805 tons per 1,000 kg of plastic. The annual ROI is recorded at 0.26%, highlighting the project's potential to support environmental conservation while providing economic benefits
Design Diameter Keluar Subsonic Diffuser Menggunakan Analisa Perhitungan Numerik Puji, Puji Ruswanto; Raharjo, Bambang; Arifin, Samsul; Nur Kholik, M Robiansyah
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol. 14 No. 2 (2024): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/teknobiz.v14i2.7180

Abstract

Karakteristik aliran dan kinerja subsonic diffuser dengan fokus pada optimalisasi geometri dan penerapan teknik kontrol aliran pasif. Subsonic diffuser memainkan peran krusial dalam berbagai aplikasi aerodinamika, namun masih menghadapi tantangan dalam hal separasi aliran dan pemulihan tekanan yang efisien. Studi ini dilakukan melalui pendekatan analisa perhitungan numerik untuk mengetahui kebutuhan besar diameter keluar yang optimal dari subsonic diffuser sehingga didapatkan nilai efisiensi yang diinginkan. Sehinga dengan diameter aliran keluar diffuser = 6.4 cm dan diameter aliran masuk diffuser = 4 cm diperoleh, sonic velocity = 314,3 m/s, efisiensi konversi energi dengan mach number diperoleh = 0.8, perubahan suhu dan temperature dimana suhu awal (T1) = 313 K, diperoleh suhu akhir (T2) = 322 K , tekanan awal (P1) = 110 kPa , tekanan akhir (P2) = 150 kPa, kecepatan aliran gas masuk / In (C1) = 250 m/s, kecepatan aliran gas keluar / exit (C2) = 97,5 m/s, massa jenis udara pada saluran masuk gas ideal p1=1.244 kg/m dan massa jenis udara pada saluran keluar gas ideal p2=1.19 kg/m.
Co-Authors Firdhaus, Taufan Maulana, Eka Nur Kholik, M Robiansyah Nursiwan Prawoto Puji, Puji Ruswanto Samsul Arifin Triwinanto, Puguh Winanda, Aryan