Garuda - Garba Rujukan Digital

Rachmatullah -

Politeknik Negeri Indramayu

Author-ID : 4090850

Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Articles

Analisis Efisiensi Box Fermentasi Oncom Tahu dengan Sistem Arduino Meri Rahmi; Agus Sifa; Rachmatullah -
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Tofu dregs are a by-product in the process of making tofu in solid form and are obtained from squeezed soybean pulp. Tofu pulp still has a relatively high protein content because in the process of making tofu not all protein content is extracted, especially when using a simple and traditional milling process. One of the products from tofu dregs is tofu oncom. Oncom is a fermented food product typical of West Java. Oncom is a processed food derived from soybeans, its nutritional value is almost the same as tofu and tempe. It contains protein and fat that are good for the body. The process of making tofu oncom is almost the same as making tempe oncom, However, its utilization is still small in the industry compared to its abundant production. So, a lot of it is still wasted. In addition, the process of making tofu oncom is still very simple and uses traditional methods by relying on natural conditions and this takes longer. For this reason, with better methods and technology, a fermentation box is made for the manufacture of tofu oncom. The method used is a heater and temperature and humidity sensors to speed up the fermentation process. In addition, the use of aluminum material, in order to ensure that oncom tofu is more hygienic so that it can become one of the traditional products that can compete in a better market. The results of this fermentation box indicate that the processing time for making tofu oncom is faster from 2 days (± 24 hours) to 1 day (± 14 hours). Reduction of processing time by about 58% so that productivity also increases to above 50% with a box capacity of up to 50 kg of tofu dregs.

Pengujian Turbin Air Pusaran Gravitasi dengan Variasi Overlap Ratio Rotor Muhammad Luthfi; Meri Rahmi; Rachmatullah -
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The gravitational water vortex turbine is a turbine system that can convert the energy from artificial water vortex by means of the drained water through the basin outlet to the kinetic energy of rotor rotation. This type of turbine system is able to produce energy despite the low head of water flow. Many researches were conducted to improve the efficiency of this turbine by changing the shape of basin, or the rotor. Meanwhile, the Savonius rotor has good starting rotation and ease of fabrication, but low efficiency. One way to increase the efficiency of this rotor is to apply the gap between the blades which is called Overlap Ratio (OR). In this research, the gravitational water vortex turbine with the conical-shape basin was combined with the various-OR Savonius rotors with area proportion of 26,88% and without endplate and the effect was observed to the efficiency of turbine. The volume flowrate of channel was maintained constant at 0,005 m3/s while mass was added gradually for the torque measurement system by using rope brake dynamometer. The result showed that for all rotors, the greater efficiency occurred in the low rotational speed. Moreover, the rotor with OR of 0,15 had greater mechanical efficiency which was around 22,78% for the rotor with endplate 26,88% and 27,18% for the rotor without endplate than rotor with OR of 0. Meanwhile, rotor without endplate had higher maximum mechanical efficiency for all OR variation than that with endplate 26,88%.

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