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All Journal Jurnal Rekayasa Mesin Eksergi: Jurnal Teknik Energi
Mochamad Denny Surindra
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Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Pembuatan Klem Pemegang Pipa Peralon dari Limbah Plastik Menggunakan Proses Compression Molding Suyadi Suyadi; Ariawan Wahyu Pratomo; Paryono Paryono; Poedji Haryanto; Mochamad Denny Surindra
Jurnal Rekayasa Mesin Vol 15, No 3 (2020): Volume 15, Nomor 3, Desember 2020
Publisher : Jurusan Teknik Mesin - Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v15i3.1946

Abstract

Tujuan penelitian ini adalah menaikkan nilai tambah sampah plastik menjadi produk klem pemegang pipa paralon dengan proses compression molding di bengkel teknik mesin Polteknik negeri Semarang. Sampah plastik yang sering kita jumpai disekitar kita adalah jenis Polyethylene Terephthalate (PET) dari bekas kemasan air mineral dan Polypropylene (PP) dari bekas alat rumah tangga seperti ember, kursi dan lain-lainya, agar mengurangi beban lingkungan maka perlu di daur ulang menjadi produk klem pemegang pipa paralon dengan proses compression molding, dari hasil penelitian diperoleh kekuatan tegangan bengkok produk klem plastik penjepit paralon yaitu bahan plastik daur ulang PP menghasilkan kekuatan/tegangan bengkok sebesar σb=4,67 N/mm2, dan bahan plastik daur ulang PET menghasilkan kekuatan/tegangan bengkok sebesar σb=4,325 N/mm2.
Challenges and Solutions in Hydropower: Analyzing Francis Turbine Performance and Operational Dynamics Mochamad Denny Surindra; Baktiyar Mei Hermawan; Suwarti; Slamet Priyoatmojo; F. Gatot Sumarno
Eksergi Vol. 21 No. 02 (2025): MAY 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i02.6592

Abstract

This paper addresses the global challenge of sustainable energy, exploring alternatives to dwindling fossil fuels and rising CO2. While renewables like solar and wind offer potential, they face geographical and intermittent limitations. Thermal and nuclear energies are discouraged due to severe environmental and health impacts. Hydropower emerges as a highly reliable and favored global solution, harnessing energy from flowing water, tides, and dams. It's the most prevalent renewable source for electricity, offering consistent, dependable, and emission-free supply. The Francis turbine is crucial to hydropower, known for its high efficiency. Its spiral casing, runner, and guide vanes efficiently convert water's energy into electricity. Water flows from a reservoir to the turbine, where guide vanes regulate entry to the runner, driving a generator. Our analysis reveals key factors affecting hydropower performance: energy source, guide vane opening, servomotor performance, and governor control system. Sediment accumulation at the inlet causes head loss, reducing optimal output. Misaligned guide vane openings can drop rotational speed, leading to suboptimal load. Servomotor issues like wear also require maintenance. A 5% speed drop setting effectively manages water pressure and flow, enabling smooth load escalation.
Co-Authors Ariawan Wahyu Pratomo BAKTIYAR MEI HERMAWAN F. Gatot Sumarno Laksono Trisnantoro Poedji Haryanto Slamet Priyoatmojo SUWARTI Suyadi Suyadi