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<![CDATA[Kinerja mesin air water harvester dengan evaporator koil pada berbagai kecepatan udara masuk ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Alit, I.B.]]>;
<![CDATA[Maulana, A.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 1 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v14i1.828
<![CDATA[An experimental study regarding the performance of air water harvester was conducted at the natural ambient conditions. The air water harvester consisted of 3 coil evaporators and used R134a as the working fluid. The coil evaporators were constructed from copper tubes with a diameter of 6.35 mm, coil number of 26, and coil diameter of 8 cm. The air intake velocities were 4 m/s, 5 m/s, 6 m/s. The results show that the highest water mass is 1.72 kg for 7 hours at the air velocity of 6 /s, and the total heat transfer rate is 582 J/s. Increasing the air intake velocity raises the fresh water mass and the total heat transfer rate. Based on EUR the machine is not effective yet but based on the price of the water the machine gives benefit.]]>
<![CDATA[Pengaruh variasi kecepatan udara dan massa bahan terhadap waktu pengeringan jagung pada alat fluidized bed ]]>
<![CDATA[Syahrul, S.]]>;
<![CDATA[Romdhani, R.]]>;
<![CDATA[Mirmanto, Mirmanto]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 6, No 2 (2016): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v6i2.15
<![CDATA[Indonesia is an agricultural country that has many agricultural products so that post-harvest handling is necessary so that the crop is not quickly broken when stored or distributed. One harvests in Indonesia, which require post-harvest handling such as corn. Based on SNI, the maximum moisture content of corn feed raw material has a moisture content of 14%. The water content of the corn used is 20% with a tolerance of ± 0.5%. Variations air speed used is 5 m /s, 6 m /s and 7 m /s with a variation of the mass of material that is 0.5 kg, 1 kg, and 1.5 kg. With the variation of air velocity and mass of the material showed that the higher the speed of the air, the faster drying time. In addition, the heavier material is drained, it will take longer. Variations of air velocity and mass of materials that require the fastest drying time is the air speed of 7 m /s with a mass of 0.5 kg. Variations of air velocity and mass of material that takes the longest drying air is at a speed of 5 m / s with a mass of 1.5 kg of material.]]>
<![CDATA[EFFECT OF TUBE DIAMETER AND SURFACE ROUGHNESS ON FLUID FLOW FRICTION FACTOR ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Yudhyadi, IGNK]]>;
<![CDATA[Sulistyowati, Emmy Dyah]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 4, No 2 (2014): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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<![CDATA[Experiments have been performed to investigate the effect of channel roughness and diameter on fluid friction. Three different diameters and roughness of tubes were used to examine the friction factor. The first tube made of stainless steel with an inner diameter of 1.14 mm was investigated at Brunel University, whilst the others made of PVC with diameters of 17 mm and 15.5 mm rough were tested at Mataram University. The stainless steel was equipped with a 200 mm calming section and smooth one. The 15.5 mm diameter tube was coated internally with sand that had an average grain size of 0.5 mm so that the tube had a relative roughness of 0.032. The last tube with a diameter of 17 mm was smooth as explained in the H408 Fluid Friction Experimental Apparatus manual. The results indicate that the flow in the stainless steel tube still obeys the theory and in the 17 mm tube shows a deviation in friction factor with the theory. However, this was due to no calming section installed in the test rig. Flow in the rough tube (15.5 mm diameter) demonstrates that the Reynolds number does not affect the friction factor in turbulent regimes and the experimental friction factors were reasonably in a good agreement with the theory or Moody diagram. Hence, the effect of decreasing in diameter of channels on friction factor is insignificant.]]>
<![CDATA[Effect of motorcycle exhaust pipe temperature and electrical circuit on harvested dc power from thermoelectric generators ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Tira, H.S.]]>;
<![CDATA[Pabriansyah, A.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v10i1.319
<![CDATA[The need for energy consumption nowadays becomes very important things, especially the need for electrical energy. Technology to convert heat into electricity directly can be realized using thermoelectric generators. To know the thermoelectric generator performance, this study performs an investigation of thermoelectric generator operated using motorcycle exhaust heat to generate DC power. Three identical thermoelectric generators model TE-MOD-5W5V-35S were used in this investigation. To generate different high temperatures the motorcycle was run at 1600 rpm, 2100 rpm, 3100 rpm. The circuits examined were series, parallel and combination of the two. All data were recorded using DAQ MX 9714 NI data logger that was connected to the PC using LabView program. The loads used in the current measurements were a thermoelectric cooler module model SP1848 and a fan 12 V - 0.13 A. Those two loads were installed in a parallel circuit. The results show that the tests without load produce the highest voltage, while the tests with the load result in the highest power. Increasing the temperature difference increases the power, and the parallel circuit results in the biggest power but the lowest voltage. The highest voltage of 3.3 V with series circuit was attained, and the highest power of 0.133 W with a parallel circuit was also obtained.]]>
<![CDATA[Utilization of outdoor units as freshwater freezing machines on various masses of salt solution ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Sayoga, I.M.A.]]>;
<![CDATA[Waasi, A.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 14, No 2 (2024): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v14i2.947
<![CDATA[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.]]>
<![CDATA[Pengaruh kecepatan udara dan massa gabah terhadap kecepatan pengeringan gabah menggunakan pengering terfluidisasi ]]>
<![CDATA[Syahrul, S.]]>;
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Romdani, S.]]>;
<![CDATA[Sukmawaty, S.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 7, No 1 (2017): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v7i1.8
<![CDATA[Grain processing does not meet the actual grain harvests. This is due to the unsuitable drying process. Milling grain entrepreneurs and farmers in Indonesia are currently conducting a drying process under the sun. Based on the National Standards Body (BSN), grain moisture content must be at 14% to maintain the grain at high qualities. The purpose of this study is to determine the effect of velocity and grain mass variations on drying times. The grain used in this study contains an initial moisture content of 22% ± 0.5%. The grain is dried by inserting it into the drying chamber and varying the air velocities and grain mass. The air velocities used are 4 m/s, 5 m/s, 6 m/s and the variations of the grain mass are 1 kg 2 kg and 3 kg. The results show that increasing the air velocity decreases the drying time. On the other hand, when the grain mass is increased, the drying time elevates. The air velocity and mass of the grain that results in the fastest drying time are 6 m/s and 2 kg. The time required for achieving the water content of 13.6% is 30 menit. At the air velocity of 4 m/s, and the grain masses of 1 kg, 2 kg, and 3 kg, to achieve moisture contents of 13.4%, 13.5% and 13.4% the drying time needs 50 minutes.]]>
<![CDATA[PENGARUH VARIASI SUSUNAN PIPA TERHADAP LAJU PELEPASAN KALOR PADA KOLEKTOR SURYA ABSORBER BATU GRANIT ]]>
<![CDATA[Mirmanto, Mirmanto]]>;
<![CDATA[Wirawan, Made]]>;
<![CDATA[Tira, Hendry Sakke]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 5, No 2 (2015): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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<![CDATA[As the fossil energy gradually gets depletion, alternative energies should be utilized. One of alternative energies, which is easier to be used, is solar energy. In this research, the solar energy, which was captured using a flat plate collector with a granite absorber, was used to heat water. The overall dimension of the collector was 0,8 m x 1 m x 0,01 m with a gap between the glas cover and the absorber of approximately 50 mm. Copper pipes with a diameter of 1/2 inch were used to transfer the heat to the water. The volumetric rates of the water were 200 cc / min, 250 cc / min and 300 cc / min and the water was flowed naturally from a higher water tank and was adjusted using a valve installed at the outlet of the collector.The test results indicate that the energy absorbed by the water decreases with the observation time. The parallel pipes cause quick heat removals from the granite absorber. Energy absorbed by the water in the parallel pipes is much greater than that in the serpentine pipe, and the granite can be used for storing the heat energy]]>
<![CDATA[PENGARUH DEBIT TERHADAP UNJUK KERJA ALAT PENUKAR KALOR DAN PENURUNAN SUHU RUANGAN ]]>
<![CDATA[Mirmanto, Mirmanto]]>;
<![CDATA[Sayoga, I Made Adi]]>;
<![CDATA[Zulkarnain, Zulkarnain]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 6, No 1 (2016): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v6i1.18
<![CDATA[ABSTRACTDue to population growth, industry advance and rapid development, fresh and comfortable air may be difficult to get. Conditioning the air to get comfort environment may be a basic demand for people, but the prices of the device and its operation for this purpose are expensive. This research tries to solve this problem but it is just only to know the capability of the heat exchanger to transfer/ absorb heat and is not to cool the room to be below the ambient temperature. The working fluid used was clean water and the heat exchangers employed were parallel and serpentine which were made of copper pipes with a diameter of 1/4 inch and 1/2 inch (for the header). The volumetric flow rates used were 300 ml/minutes, 400 ml/minutes and 500 ml/minutes. While the heat that should be absorbed by the water from the room is 50 W, 100 W and 150 W. The results show that the effect of volumetric flow rate on heat exchanger performance and room temperature is insignificant. From the pressure drop results, the parallel pipe heat exchanger has lower pressure drops while the serpentine has higher pressure drops. ]]>
<![CDATA[Uji sifat fisik dan kimia bioetanol dari jagung (Zea mays L) ]]>
<![CDATA[Tira, H.S.]]>;
<![CDATA[Mara, M.]]>;
<![CDATA[Zulfitri, Z.]]>;
<![CDATA[Mirmanto, M.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v8i2.231
<![CDATA[The aim of this research is to know the physical characteristics and chemical contents of corn bioethanol (Zea Mays L.). The bioethanol is produced by distillation process through variations in fermentation duration. The bioethanol produced then was tested in order to measure the physical characteristics and sulphur content. The measured physical and chemical characteristics of bioethanol were density, kinematic viscosity, flash and fire point and sulphur content.The results showed that the physical characteristic value and sulphur content of the bioethanol had close values compared to those of the standart. They were found in fermentation with duration of 70 hours under second distillation process. However a further research is still be required to obtain a suitable characteristic for transpostation purpose. ]]>
<![CDATA[Pengaruh suhu udara masuk terhadap massa air yang dihasilkan pada alat pemanen air sederhana ]]>
<![CDATA[Mirmanto, M.]]>;
<![CDATA[Nurpatria, N.]]>;
<![CDATA[Hendra, J.K.]]>
<![CDATA[ Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin ]]>
Publisher : <![CDATA[Universitas Mataram ]]>
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DOI: 10.29303/dtm.v13i1.617
<![CDATA[An experimental investigation was performed to obtain the effect of air temperatures on the freshwater production of a simple water harvester. The amount of freshwater mass production depends on several variables, e.g. intake air temperature. For this reason, his study examined the relationship between the intake air temperature and the mass of freshwater production. The research was conducted experimentally with R134a refrigerant as the working fluid and the intake air temperatures tested were 30°C, 35°C, and 40°C. The results show that the highest freshwater mass production was 0.340 kg at the intake air temperature of 30°C. Meanwhile, the highest coefficient of performance was 9.12 at the same intake air temperature and the highest total heat transfer rate was 184.16 W at the intake air temperature of 40°C. The effect of the intake air temperature on the mass of water, coefficient of performance and the total heat transfer rate was not clear. ]]>
