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All Journal Sprocket : Journal of Mechanical Engineering Sinergi Polmed : Jurnal Ilmiah Teknik Mesin
Napitupulu, Richard A M
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Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH HOT DIP GALVANIZING BAJA KARBON RENDAH TERHADAP KETEBALAN STRUKTUR MIKRO DAN KEKERASAN Napitupulu, Richard A M; Perangin angin, Siwan E A; Sihaloho, Wandipu P
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.v6i2.2478

Abstract

Baja ST41 merupakan baja karbon rendah yang banyak digunakan sebagai material komponen mesin, namun memiliki kelemahan berupa nilai kekerasan yang rendah. Salah satu metode untuk meningkatkan kekerasan baja karbon rendah adalah dengan proses Hot Dip Galvanizing. Penelitian ini bertujuan untuk mengetahui pengaruh variasi waktu pencelupan terhadap nilai kekerasan dan komposisi kimia pada baja ST41. Proses galvanisasi dilakukan pada temperatur 440°C, 450°C, dan 460°C dengan variasi waktu pencelupan selama 30, 45, dan 60 detik. Pengujian meliputi uji kekerasan menggunakan mikrometer Vickers, uji ketebalan lapisan, struktur mikro, dan uji komposisi kimia. Hasil penelitian menunjukkan bahwa proses hot dip galvanizing dapat meningkatkan kekerasan baja ST41, dengan nilai tertinggi sebesar 223,80 VHN pada suhu 460°C dan waktu pencelupan 60 detik. Ketebalan lapisan seng yang terbentuk masing-masing adalah 12,10 µm, 13,93 µm, dan 13,69 µm. Pengamatan struktur mikro menunjukkan pembentukan lapisan yang merata, yang terdiri dari fasa eta, zeta, delta, dan gamma sebagai hasil dari proses difusi antara seng dan baja.
Pengaruh Material Reflektor Terhadap Kinerja Kompor Energi Surya Napitupulu, Richard A M; Manurung, Charles S.P; Naibaho, Waldemar; Sihombing, Suriady
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 2 (2022): Edisi Februari 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1328.443 KB) | DOI: 10.36655/sprocket.v3i2.635

Abstract

The use of solar energy in Indonesia is the right choice as an alternative energy for energy needs in industry or to meet daily energy needs in households. To utilize solar energy for cooking purposes, a solar cooker can be used. Factors that affect the performance of this solar cooker in addition to the length of time it shines and the intensity of thermal radiation from the sun are the reflexivity of the collector material, the surface area of ​​the collector, the geometric shape and location of the focal point of the collector, the normal direction of the collector surface to the incoming sunlight, and the amount of heat loss to the surroundings. The materials used as reflectors in the research on this solar cooker are zinc (aluminum and galvanized) AL-Zn and black paint back ground mirror glass. This material is re-glued on top of a ready-made parabolic dish from the market. Then look for the focal point that corresponds to the diameter of the parabola. From the results of the study, it can be concluded that the back ground mirror glass material with black paint is better to use than the AL-Zn zinc plate if it is used as a raw material for the surface material (reflector) of solar cooker. Likewise, the efficiency of the solar oven in terms of the amount of heat that is converted into energy for heating the pot is better for a solar oven than a reflector with black paint back ground mirror glass material. And the efficiency of the solar cooker from the black paint back ground mirror on the first day is 16.4% to 25.7% on the second day, while the efficiency of the solar cooker from the AL-Zn zinc plate on the first day is 16.4% to second day 22.8%. The emissivity of the solar stove with AL-Zn zinc plate reflector on the first day was 0.02906 and on the second day 0.02892, while the emissivity of the solar cooker with black paint back ground mirror reflector on the first day was 0.01812 and the second day was 0 0.02544.
Rancangan Fasilitas Pembangkit Listrik Tenaga Sampah: Studi Kasus di Kota Medan Sumatera Utara Simanjuntak, J P; Napitupulu, Richard A M; Lumbangaol, Partahi
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 2 (2022): Edisi Februari 2022
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1067.02 KB) | DOI: 10.36655/sprocket.v3i2.636

Abstract

In planning a power generation system using waste as an energy source, it is necessary to conduct an initial analysis of the potential local waste available. Not all waste can be used as the source of thermal energy by burning in an incinerator. Therefore, the selection is required to obtain the suitable waste and characterization to determine the potential thermal energy content in the waste. This article aims to obtain the electrical capacity produced from local waste to generate electricity in some regions of the city of Medan. The analysis is carried out on the availability of the waste and its potential for thermal energy generated. The selected incinerator of the fixed bed type with a two-stage air supply was explained comprehensively. Minimum pollution, high thermal conversion, and ease of operation are the critical point considered for the selected incinerator. The results revealed that 50 kWe was generated from a power plant system using waste. This amount of electricity can provide electricity for 25 households in the area where the case is located. This study is expected to provide sustainable waste management to the city of Medan in converting the waste into the household electricity supply.
Co-Authors Lumbangaol, Partahi Manurung, Charles S.P Naibaho, Waldemar Sihaloho, Wandipu P Sihombing, Suriady Simanjuntak, J P siwan edi amanta Perangin angin