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All Journal Rotasi Jurnal Simetris SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin Jurnal Mechanical Jurnal Teknik Mesin Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Jurnal Gema Ngabdi Techno Jurnal Karya Pengabdian Teknik Mesin Energy, Materials and Product design Jurnal Pengabdian Masyarakat Bangsa
M. Mirmanto, M.
Teknik Mesin Universitas Mataram
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Unjuk kerja kulkas termoelektrik dengan rangkaian seri dan paralel pada beban air 1500 ml Ananta, Hendra; Padang, Yesung Allo; Mirmanto, M.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 7, No 2 (2017): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.014 KB) | DOI: 10.29303/dtm.v7i2.157

Abstract

Along with the increase of human mobility, the portable refrigerator becomes very important because it can be used to store goods or drinks to be durable or cooler. Therefore, a refrigerator using thermoelectric is an option. Thermoelectric fridge besides easy to carry anywhere is also easy maintenance, durable, more compact, lightweight, no heavy rotating components, no use of freon and small power. Refrigerator research with thermoelectric has been done with series and parallel electric circuits to know the effect of the circuit difference to the performance of refrigerators. This study uses a mini fridge with an overall dimension of 40.8 cm x 32.6 cm x53.8 cm and with 2 thermoelectric modules TEC1-12706 model. The electrical power used for each circuit is about 12 W. The data retrieval in the test uses DAQ MX 9714 NI data logger which is connected to the PC using LabView program. The results show that the test research with a water load of 1500 ml results in the temperature of the refrigerator room of about 22.54oC for the series and 23.10oC for the parallel. While the value of COP obtained with the series circuit is 0.45 and with the parallel circuit is 0.4. There is no effect of the form of the circuit on the performance of the refrigerator.
Penerapan Mesin Penyedot Debu Model Sentrifugal Untuk Usaha Kreatif Kerajinan Kulit Kerang Mutiara “Concha” Handycraft Menunjang Pariwisata Berkelanjutan Di Desa Meninting Lombok Joniarta, I Wayan; Wirawan, Made; Adi Sayoga, I Made; Yudhyadi, I Gusti Ngurah Ketut; Mirmanto, Mirmanto
Jurnal Gema Ngabdi Vol. 7 No. 1 (2025): JURNAL GEMA NGABDI
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jgn.v7i1.547

Abstract

The problem of dust pollution at the service partner "Concha Handycraft" is at the core of program activities. Controlling dust from its source is the main goal, namely replacing blower style vacuum cleaners with centrifugal type vacuum cleaners. The centrifugal type was chosen because it has a simple shape, the motor is separate from the fan, so the motor is protected from dust. The activity method begins with designing, purchasing materials, manufacturing in the workshop, testing, minor repairs, application and assistance. The results obtained are that the centifugal model vacuum cleaner that has been applied has advantages. The electrical power used from previously 260 watts to 120 watts. Working time can also increase because the motor used is a DC motor so it doesn't heat up quickly. If you use a blower model, the electric motor heats up quickly because it gets dust and needs to be cooled. The ability to suck up dust is also increased, with a fan at a 30 degree angle the ability to suck up and throw out is balanced. By using a centripugal model vacuum cleaner, 95% of the dust produced by the grinding machine can be sucked into the dust collection chamber.  Concha Handycraft partner SME owners and employees are very happy with the new machine, so they can be more productive at work, and stay protected from exposure to dust in the workplace.
Effect of inlet air velocities on freshwater mass and heat transfer rates in an air-water harvester 0.5 PK Mirmanto, M.; Padang, Y.A.; Mari, A.K.
Dinamika Teknik Mesin Vol 15, No 2 (2025): 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.v15i2.1168

Abstract

During the dry season, some regions experience a shortage of clean water due to drought. Air water harvesters utilize the principle of condensation to produce clean freshwater from humid air can be alternative to solve the drought. This device works by condensing water vapour in the air using an evaporator. The focus of this study was on the effect of air velocities on the freshwater production and heat transfer rates. This research was conducted experimentally using refrigerant R134a as the working fluid. The compressor used was a 0.5 HP rotary compressor. The inlet air velocities applied were 0 m/s, 1.5 m/s, and 3 m/s. The results showed that the highest average mass of water obtained was 3.73 kg using the air velocity variation of 3 m/s. Meanwhile, the total heat flow absorbed by the evaporator from the air was highest also at the air velocity variation of 3 m/s, which was 1238.22 W. Increasing inlet air velocities raises the freshwater production and heat transfer rates.
Effect of inlet air velocity on air-water harvester machines using one and two evaporator with 1.5 PK compressor power Vayasqi, M.A.; Padang, Y.A.; Mirmanto, M.
Dinamika Teknik Mesin Vol 15, No 2 (2025): 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.v15i2.1077

Abstract

During the dry season, clean water crisis often occurs in various parts of Indonesia. As a result, clean potable water is difficult to obtain. Therefore, this research uses an air-water harvester machine, because this machine can be used anywhere as long as there is a source of electricity at that location. This study aims to determine the effect of inlet air velocity on air-water harvester machines using one and two evaporators with 1.5 PK rotary compressor power on water mass and total heat transfer rate. The method used in this research is the experimental method, with variations in inlet air velocity of 0 m/s, 1.5 m/s and 3 m/s, using one and two split AC fin type evaporators each with a capacity of 0.5 PK, with a pipe diameter of 7.65 mm. The refrigerant used is R32. The study was conducted from 09:00 to 16:00, for 18 days, 7 hours per day. The results showed that the higher the air velocity used and the increase in the number of evaporators, can increase the mass of water and the heat transfer rate obtained. The highest mass of water and heat transfer rate obtained in this study is in the air velocity variation of 3 m/s using two evaporators, which is 4.073 kg of water mass for 7 hours and a total heat transfer rate of 1375.09 W.
Kinerja Mesin Air-Water Harvetser dengan Dua Koil Evaporator Mirmanto, Mirmanto; Syahrul, Syahrul; Sutrisno, Ahsani
ROTASI Vol 27, No 3 (2025): VOLUME 27, NOMOR 3, OKTOBER 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.3.8-13

Abstract

In the dry season, certain areas have difficulty obtaining water for cooking or drinking. Therefore, it is necessary to present an air water harvester (AWH) machine to harvest water from the air. However, this machine is still limited in production. Various forms of evaporators have been applied to increase the productivity of water, but the machine has not yet produced sufficient water. This study examined the performance of AWH machines with two coil-shape evaporator. The performance mentioned here were the mass of water produced and the heat transfer rate from the air to the evaporator walls. In the open literature, no study like this has been found. This 2-coil evaporator in this study were tested with variations in incoming air velocity of 4 m/s, 5 m/s and 6 m/s with natural environmental conditions. The machine power used was 1 PK or 746 W.  The results of this study show that the maximum water mass produced was 1.46 kg and the heat transfer rate was 360 W obtained the inlet air velocity of 5 m/s. So the increase in speed does not necessarily increase the mass of water and the heat transfer rate occurs.
Simulasi karakteristik mesin termoakustik pembangkit listrik dengan penambahan model kerugian minor dari dua segmen konis Nurpatria, N.; Mirmanto, M.; Padang, Y.A.; Nurchayati, N.
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.v14i2.845

Abstract

Acoustic energy output level from regenerator segment of a thermoacoustic engine model is attenuated along it’s loop due to several conditions including minor losses. This article discusses the result of Delta EC simulation of a thermoacoustic engine model acting as simple electric power generator that inserted with two conical segments. The cone segments are capable to lower the energy loss which in turn improve the overall performance of the engine in term of nett heat to acoustic energy conversion efficiency. Combined acoustic energy loss induced by both cones is equivalent to 4.94 watts minor losses. At this condition, regenerator segment amplifies the incoming acoustic energy flow of 57.02 watt up to 93.57 watt, which is equals to 36.55 watts acoustic amplification. It leads to increasing of overall engines heat to acoustic efficiency into 14.05%, which is 1.29% higher than those at the case of without cones. This engine performance improvement addressed to smoother streamline of working fluid flow inside the loop.
Heat loss from hot water flowing in a copper pipe insulated using air enclosed with a PVC pipe Albayani, A.; Mirmanto, M.; Syahrul, S.
Dinamika Teknik Mesin Vol 8, No 1 (2018): 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.v8i1.137

Abstract

This paper presents investigations of heat loss from hot water flowing in an insulated copper pipe. Investigations were performed to know the heat loss from a copper pipe insulated using air enclosed with a PVC pipe. The fluid temperature used was kept at approximately 75°C in the entrance and its mass flow rate was around 12 g/s. The nominal copper pipe diameter was 6.35 mm; while the diameters of the PVC pipe were ranging from 12.7 mm to 5.08 mm. The length of the test section was approximately 3000 mm. The results show that the biggest heat loss is found using the bare copper pipe. When the copper pipe is insulated using air enclosed with a PVC pipe, the heat loss decreases with the increased PVC pipe diameters. The trend of the heat loss agrees with the critical insulation diameter theory.
Konduktivitas termal komposit resin epoksi dan serbuk arang tempurung kelapa Mirmanto, M.; Sugiman, S.; Fathurrahman, F.; Ramadhani, M.D.
Dinamika Teknik Mesin Vol 12, No 1 (2022): 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.v12i1.502

Abstract

Composite materials are materials that are widely developed and their use has been widespread in various industrial and household sectors. Epoxy composites filled with coconut shell charcoal powder have been tested for their thermal conductivity properties using the one-dimensional conduction method. The tested specimens had dimensions of 50 mm x 50 mm x 5 mm made of epoxy and coconut shell powder with a percentage of charcoal weight of 0%, 10%, 20% and 30%. The specimen is inserted into a thermal conductivity measuring instrument made of solid aluminum which is insulated around it. The heater is mounted on the aluminum as a heat source, while the other end is left open to the free air in the room. The results showed that the highest average thermal conductivity was a 30% variation of 0.5003 W/m°C, then a 20% variation of 0.3738 W/m°C, a 10% variation of 0.3487 W/m°C. and the lowest at 0% variation without using coconut shell charcoal powder at 0.1364 W/m°C.
Variasi persen berat tempurung kelapa terhadap konduktivitas termal komposit silicone rubber Mirmanto, M.; Sugiman, S.; Ramadhani, M.D.; Fathurrahman, F.
Dinamika Teknik Mesin Vol 11, No 2 (2021): 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.v11i2.450

Abstract

Experiments to know themal conductivities of silicone rubber composite were conducted. The sillicon rubber was mixed with coconut shells charcoal powder with weight variations. The weight presentage variations were 0, 10, 20 and 30%. Increasing the weight persentage was expected to increase the thermal conductivity of the composite. The speciment size was 50 mm x 50 mm x 5 mm. The speciments were tested according to the conduction heat transfer mode. To make sure that the temperatures were steady, the experiments were performed for about 6 hours. The results indicated that increasing the weight presentage raised the composite thermalconductivities. At 0% of wight, the composite had a thermalconductivity of 0.157 W/m°C, at 10%, 20% and 30% of weight compositions; the composite had thermal conductivities of 0.461 W/m°C, 0.58 W/m°C, and 0.73 W/m°C respectively.
Simulasi pemasangan sebuah model kerugian minor perubahan penampang di konektor loop mesin termoakustik Nurpatria, N.; Mirmanto, M.; Joniarta, I.W.; Padang, Y.A.; Susana, I.G.B.
Dinamika Teknik Mesin Vol 13, No 1 (2023): 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.v13i1.626

Abstract

A custom-designed thermoacoustic engine model has been created with the open source Delta EC simulation software. The specific design of the engine lies in the part of the heat exchanger, which allows it to receive heat from the hot gas stream resulting from the combustion of low grade biomass directly. The engine model can be coupled with a loudspeaker model that functions as a liner alternator, resulting in a simple power generator engine model. In this study, further simulations were carried out to increase the total efficiency of converting heat energy into electricity from the previous model. After that a model of minor loss of cross-sectional change was also added to the model. In a certain set of engine model parameter values without minor losses, the efficiency of converting heat energy to acoustic energy is 12.76%, equivalent to the amplification of acoustic energy by a regenerator of 33.26 W. The total efficiency of the engine model in converting heat energy into electrical energy is 10.53%. After the addition of a sub-program of minor losses due to the effect of one conical segment, there was an acoustic energy loss of 0.11 W. So that the efficiency of converting heat energy to acoustic energy was reduced by 0.01% to 12.75%. As a result, relatively small change occur in the total efficiency of the engine model.
Co-Authors A. Abdullah A. Albayani, A. A. Maulana A. Mulyanto A.D. Catur A.D. Catur Anggani, Yudi Arief Mulyanto Arif Mulyanto Arif Mulyanto, Arif B.H. Saputra Buyung Anugerah D.F. Nansah D.K. Putra Emmy Dyah Sulistyowati, Emmy Dyah F. Pramudia Fahrurrozi, Imam Fahrurrozi, Imam Fathurrahman, F. Guna, Patar Dayu H.S. Tira Hendra Ananta, Hendra Hendra, J.K. Hendry Sakke Tira, Hendry Sakke I Gede Bawa Susana I Made Adi Sayoga I Made Adi Sayoga I Made Adi Sayoga, I Made I Made Adi Sayoga, I Made Adi I Wayan Joniarta I.B. Alit I.B. Alit, I.B. I.G.A.K.C Adhi I.M. Mara I.M. Suartika Ida Bagus Alit IGNK Yudhyadi Lalu R Hidayatullah M. Athar, M. M. Faisal M. Mara M. Wirawan M. Wirawan Made Wirawan Made Wirawan, Made Mara, M. Mari, A.K. Muhammad Athar N. Nurchayati, N. N. Nurpatria N. Nurpatria, N. Nuarsa, I.M. Nurpatria Nurpatria P. Pandiatmi Pabriansyah, A. Padang, Y.A. Pandri Pandiatmi Pandri Pandiatmi Pandri Pandiatmi Pandiatmi Patar Dayu Guna R. Kurniawan R. Romdhani, R. R. Sutanto Ramadhani, M.D. Rudy Sutanto S. Romdani, S. S. Sinarep S. Sukmawaty, S. S. Syahrul S. Syahrul S. Syahrul, S. Sayoga, I.M.A. Sinarep Sinarep Sinarep Sinarep Sinarep Sinarep Sinarep Sugiman . Sujita, Sujita sutrisno, ahsani Syahrul Syahrul Syahrul Syahrul Syahrul Tarmisi, Ahmad Tira, H.S. Vayasqi, M.A. Waasi, A. Yesung Allo Padang Yesung Allo Padang, Yesung Allo Yudhyadi, I Gusti Ngurah Ketut Z. Zulkarnain, Z. Zulfitri, Z. Zulkarnain Zulkarnain