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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Energy, Materials and Product Design
Mirmanto
university of mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Analysis of the Calorific Value and Specific Gravity of Breadfruit Peel Bioalcohol (Artocarpus Altilis) as an Alternative Fuel at Various Distillation Temperatures Hendry Sakke Tira; Mirmanto; Iwanuddin; Salman; Sudirman
Jurnal Penelitian Pendidikan IPA Vol 9 No 7 (2023): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i7.2878

Abstract

The objective of this study was to investigate how distillation temperature affected the specific gravity (SG) and calorific value of bioalcohol derived from breadfruit peels (Artocarpus altilis) as an alternative fuel. The process of producing bioethanol from breadfruit peels begins with pretreatment of the peels, followed by hydrolysis with hydrochloric acid, fermentation, and finally distillation. The hydrolysis process used 20% hydrochloric acid in a volume of 25 ml, and the fermentation took 6 days with a mass of 30 gr of yeast Saccharomyces cerevisiae. The distillation process lasted two hours, with temperatures varying between 70, 80, and 90°C. This study yielded the highest alcohol content of 72.80% at 70°C and the highest volume of bioalcohol of 35.67 ml at 90°C. Meanwhile, the best Specific Gravity (SG) at 70°C was 0.8393. Furthermore, the calorific value test results revealed that the calorific value increased with increasing alcohol content. The highest calorific value obtained was 23003.406 J/gr, which was close to the ethanol calorific value of 29700 J/gr, while the lowest calorific value obtained was 22339.008 J/gr at a distillation temperature of 90°C
PENGARUH VARIASI TINGGI SUDU TURBIN DARI TINGGI BASIN TERHADAP DAYA DAN EFISIENSI TURBIN VORTEX Tri Rachmanto; Mirmanto; Randi Lelio
Energy, Materials and Product Design Vol. 3 No. 1 (2024): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, 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.
KINERJA MESIN AIR-WATER HARVESTER DENGAN SUSUNAN EVAPORATOR PARALEL PASA BERBAGAI KECEPATAN UDARA MASUK Mirmanto; Nurchayati; Nurpatria; Ahmad Sofa Amrillah
Energy, Materials and Product Design Vol. 5 No. 1 (2026): Energy, Materials and Product Design
Publisher : Jurusan Teknik Mesin dan Industri, Fakultas Teknik, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/empd.v5n1.307-315

Abstract

During the dry season, several regions in Indonesia experience drought conditions and limited access to clean water. An air-water harvester system offers a potential solution, as it utilizes flexible air conditioning (AC) components and can be implemented in various locations provided that an adequate power supply is available. This study aims to investigate the effect of inlet air velocity on water production and heat transfer rate in an air-water harvester system. An experimental approach was employed with inlet air velocity variations of 0 m/s, 1.5 m/s, and 3 m/s. The system utilized three evaporators constructed from 12U refrigerator condensers, a 1 PK compressor, and R-134a refrigerant. Experiments were conducted over a period of nine days, from 09:00 to 16:00 each day. The results indicate that increasing inlet air velocity enhances both water production and heat transfer rate. The highest average water yield was 1.676 kg over a 7-hour period at an air velocity of 3 m/s. In addition, the maximum average total heat transfer rate absorbed by the evaporator reached 295.98 W under the same air velocity condition.
Co-Authors Ahmad Sofa Amrillah Hendry Sakke Tira Iwanuddin Nurchayati Nurpatria Randi Lelio Salman Sudirman Tri Rachmanto