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Naibaho, Waldemar
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Automotive Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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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.
Analisa Karakteristik Getaran Pada Mesin Stone Crusher Berdasarkan Kapasitas Pemecah Batu Koral 50 Ton/Jam Pada Daerah Horizontal, Vertikal dan Longitudinal Berdasarkan Time Domain Sihombing, Suriady; Naibaho, Waldemar; Nababan, Wilson; Sinaga, Amran
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 4 No 2 (2023): Edisi Februari 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v4i2.895

Abstract

Stone Crusher Machine is one type of machine that is very popularly used among road construction in Indonesia, whether it is used for road or building transportation purposes where it is necessary to know how to analyze the vibration characteristics of the Stone Crusher machine based on the capacity of breaking coral in horizontal, vertical and longitudinal areas. based on the time domain. The research method is carried out by collecting data on the magnitude of the deviation, speed and acceleration that arise due to the process of breaking coral so that it produces several dimensions of the size of crushed stone. This study conducted tests at three points, namely the primary crusher, secondary crusher and tertiary crusher with a capacity of 50 tons/hour. Based on the measurement results, it is found that the highest vibration occurs in the horizontal direction of the secondary crusher machine seat where the displacement is 125.3 µm in the horizontal direction at 15 seconds, the largest velocity (Velocity) is 4.79 mm/s in the primary crusher. horizontal direction at the 45th second. and the magnitude of Acceleration (Acceleration) 1236 mm/s2 is found in the tertiary crusher vertical direction at the 45th second. According to the ISO 10816-3 standard, the vibration response results at the highest speed are 4.79 mm /s, categorized in zone B is light green, the vibration of the machine is good and can be operated without restrictions.
Co-Authors Manurung, Charles S.P Nababan, Wilson Napitupulu, Richard A M Sihombing, Suriady Sinaga, Amran