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Simulasi parameter geometri regenerator mesin termoakustik Nurpatria, N.; Syahrul, S.; Pandiatmi, P.; Sayoga, I.M.A.; Mulyanto, A.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 9, No 2 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

The utilization potentials of biomass energy in Indonesia is very large. As modeled in this paper, the energy carrier flue gas from biomass combustion in the form of heat and temperature is applied as thermodynamic source for the thermoacoustic engine model. Therefore, 33 different models were constructed, modified, and tested in DELTA-EC software simulation in order to reveal their capability. The performance based on the criterion of their acoustic power output and efficiency in a set of various combination of two regenerator geometry parameters applied, radial cross-sectional area and length. The simulation results show that greater the cross-sectional area, greater the acoustic power and engines efficiency. The smallest regenerator size is at 80 mm2 cross-sectional area and 54 mm length, generates acoustic power of 5.812 W with its corresponding efficiency of 0.686%. While the biggest regenerator in volume at 120 mm2 and 165 mm in size, be able to amplified acoustic power up to 22.810 W with efficiency of 2.693%. An engine model with the highest performance produces acoustic power of 25.848 W and efficiency of 3.051%. This model uses an optimal regenerators dimension with 120 mm2 area at length of 150 mm.

Utilization of outdoor units as freshwater freezing machines on various masses of salt solution Mirmanto, M.; Sayoga, I.M.A.; Waasi, A.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i2.947

The effect of solution mass on freezing the freshwater using an AC outdoor unit was investigated. The AC outdoor capacity was ½ PK and the evaporator to absorb the heat from the freshwater was designed in the form of a square spiral placed in a freezing box. The outdoor used R32 as the working fluid. The solution mass variations were 10 kg, 12 kg and 14 kg. The freezing box was filed with saline solution with a concentration of 20%. The mass of fresh water that was frozen was wrapped in plastic with a mass of water per package of 500 grams. The total mass of the freshwater was 10 kg. The results show that the fastest freezing time occurs at a mass of 10 kg of salt solution with a freezing time of 3.5 hours and the longest freezing time is at a mass of 14 kg of solution with a freezing time of 6 hours. The highest total heat flow rate is 554 W found in the variation of 10 kg solution mass. The AC outdoor unit is very effective to be used as a freezing machine with an EER of 5.8.

Analisis emisi gas buang kendaraan berbahan bakar etanol Mara, I.M.; Nuarsa, I.M.; Alit, I.B.; Sayoga, I.M.A.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 9, No 1 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Exhaust emissions of motorcycles are very harmful to the environment and to human health. Ethanol is an alternative fuel that can be used to substitute gasoline. Ethanol can be obtained from the fermentation of agricultural products that contain carbohydrates. Ethanol is a clean fuel and has high octane number so it produces less harmfull exhaust emission. In this research, a single cylinder four-stroke gasoline engine of Honda Astrea Legenda 100 cc was used to examine the fuel consumption and exhaust emission gas by varying the ignition timing (15o, 20o and 25o) before TDC and engine rotation (1500, 2500, 3500, 4500, and 6000 rpm) at the entire transmission gear (N, 1, 2, 3 , and 4) using ethanol 96% fuel. The results show that there is a reduction in the fuel consumption and exhaust emissions such as CO, HC and increase the levels of CO2 emissions by using ethanol 96% fuel at 20° before TDC ignition timing. Moreover, the lowest fuel consumption value is achieved at the ignition timing 20º before TDC at the engine speed 1500 rpm at transmission gear 4 that is 0.1 kg/h. In addition, the lowest CO emission value is 0.17 % volume at 6000 rpm engine rotation with transmission gear 4, the lowest HC emission value is 57, 67 ppm at 6000 rpm engine rotation with transmission gear 4 and the highest CO2 value is 13.86 % volume at 6000 rpm rotation with transmission gear 4.

Simulasi parameter geometri regenerator mesin termoakustik Nurpatria, N.; Syahrul, S.; Pandiatmi, P.; Sayoga, I.M.A.; Mulyanto, A.
Dinamika Teknik Mesin Vol 9, No 2 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v9i2.299

The utilization potentials of biomass energy in Indonesia is very large. As modeled in this paper, the energy carrier flue gas from biomass combustion in the form of heat and temperature is applied as thermodynamic source for the thermoacoustic engine model. Therefore, 33 different models were constructed, modified, and tested in DELTA-EC software simulation in order to reveal their capability. The performance based on the criterion of their acoustic power output and efficiency in a set of various combination of two regenerator geometry parameters applied, radial cross-sectional area and length. The simulation results show that greater the cross-sectional area, greater the acoustic power and engines efficiency. The smallest regenerator size is at 80 mm2 cross-sectional area and 54 mm length, generates acoustic power of 5.812 W with its corresponding efficiency of 0.686%. While the biggest regenerator in volume at 120 mm2 and 165 mm in size, be able to amplified acoustic power up to 22.810 W with efficiency of 2.693%. An engine model with the highest performance produces acoustic power of 25.848 W and efficiency of 3.051%. This model uses an optimal regenerators dimension with 120 mm2 area at length of 150 mm.

Utilization of outdoor units as freshwater freezing machines on various masses of salt solution Mirmanto, M.; Sayoga, I.M.A.; Waasi, A.
Dinamika Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v14i2.947

The effect of solution mass on freezing the freshwater using an AC outdoor unit was investigated. The AC outdoor capacity was ½ PK and the evaporator to absorb the heat from the freshwater was designed in the form of a square spiral placed in a freezing box. The outdoor used R32 as the working fluid. The solution mass variations were 10 kg, 12 kg and 14 kg. The freezing box was filed with saline solution with a concentration of 20%. The mass of fresh water that was frozen was wrapped in plastic with a mass of water per package of 500 grams. The total mass of the freshwater was 10 kg. The results show that the fastest freezing time occurs at a mass of 10 kg of salt solution with a freezing time of 3.5 hours and the longest freezing time is at a mass of 14 kg of solution with a freezing time of 6 hours. The highest total heat flow rate is 554 W found in the variation of 10 kg solution mass. The AC outdoor unit is very effective to be used as a freezing machine with an EER of 5.8.

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