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All Journal Jurnal Rekayasa Mesin Energy, Materials and Product design
Mirmanto
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Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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The Effect of Hot Air Flow Velocity on The Drying Characteristics of Turmeric in A Rotary Dryer Lalu Sultan Giri Tanjung; Rudy Sutanto; Mirmanto
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6691

Abstract

Turmeric (Curcuma longa) is a rhizome plant widely used in the food, pharmaceutical, and cosmetic industries. This study aims to determine the characteristics of turmeric after the drying process and to analyze the effect of variations in hot air flow rate on moisture content reduction, drying rate, and thermal efficiency. Although various studies on turmeric drying have been conducted, most of these studies only tested one parameter, such as cylinder speed, drying temperature, and airflow rate, without considering the interaction of hot airflow rate in the rotary dryer system. The drying method in this study used a rotary dryer with a heat source from LPG combustion, at hot air flow rates of 5.2 m/s, 7.9 m/s, and 9.1 m/s with a drum rotation speed of 6 rpm for 360 minutes. The results showed that higher hot air flow rates accelerated the drying process. Optimal conditions were achieved at a speed of 9.1 m/s with a moisture content of 43.97%. Although drying was faster at higher speeds, the best thermal efficiency (23.36%) occurred at a speed of 7.9 m/s. Meanwhile, at a speed of 9.1 m/s, efficiency decreased to 22.39%.
PENGARUH VARIASI TINGGI SUDU TURBIN DARI TINGGI BASIN TERHADAP DAYA DAN EFISIENSI TURBIN VORTEX Rachmanto, Tri; Mirmanto; Lelio, Randi
Energy, Materials and Product Design Vol. 3 No. 1 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Mataram

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Abstract

Electrical energy is a very important need for human life in various aspects, both on a large and small scale. One of the efforts to reduce the use of fossil fuels is to use natural resources that are not limited and can be renewed. Micro Hydro Power Plant (MHP) is an alternative source of electricity for the community, one of which is a vortex turbine. The vortex turbine is one type of micro hydro turbine that utilizes a whirlpool as a blade drive. This study examines the effect of blade height variations of 25%, 30%, and 35% of the basin height on power and efficiency. The results showed that the largest turbine power at 25% blade height variation from the basin height with a discharge of 0.009 m3/s was 3.294 Watt with an efficiency of 51.10%. The largest turbine power at an angle variation of 30% of the basin height with a discharge of 0.009 m3/s is 3.364 Watt with an efficiency of 50.66%. The largest turbine power at an angle variation of 35% of the basin height with a discharge of 0.009 m3/s is 4.062 Watt with an efficiency of 62.35%. Turbine power based on two-way anova analysis shows that between variations in turbine height and flow discharge have a significant effect on the turbine power produced and turbine efficiency based on two-way anova analysis shows that between variations in turbine height and flow discharge have a significant effect on the turbine efficiency produced.
Co-Authors Lalu Sultan Giri Tanjung Lelio, Randi Rudy Sutanto Tri Rachmanto, Tri