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All Journal Traksi : Majalah Ilmiah Teknik Mesin Rotasi Jurnal Teknik Rekayasa Mesin LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Indonesian Journal of Science and Technology JMPM (Jurnal Material dan Proses Manufaktur) Turbo : Jurnal Program Studi Teknik Mesin Machine : Jurnal Teknik Mesin SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan at-tamkin: Jurnal Pengabdian kepada Masyarakat Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Jurnal Fisika : Fisika Sains dan Aplikasinya ARMATUR : Artikel Teknik Mesin dan Manufaktur Jurnal Pengabdian Vokasi Jurnal Polimesin
Muhamad Jafri
Universitas Nusa Cendana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Studi eksperimen rumah pengering ultra-violet (solar dryer) sistem hibrid tungku biomassa melalui variasi kecepatan aliran udara panas Verdy A. Koehuan; Margaretha Kewa Unarajan; Defmit B.N. Riwu; Muhamad Jafri
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol 4 No 1 (2023): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v4i1.3296

Abstract

The ultra-violet dryer integrated with the biomass furnace is a drying method with a forced mechanism. In this study, an experimental study was carried out. The drying process of porang tubers uses a hybrid system ultra violet plastic dryer (UV solar dryer) through varying the speed of the inlet air to obtain efficient drying results and porang tuber products. The results showed that the final moisture content of porang tubers after drying per day for each variation of air speed obtained the lowest value of 10.50%bb with the highest drying rate of 0.3373 kg/hour from the assumption of an initial moisture content of 70%bb, which occurs in variations airspeed of 1.8 m/s. while the speed is 1.3 m/s with the lowest drying rate of 0.330 kg/hour with a final moisture content of 11.74%.bb) Drying efficiency for variations in the speed of hot air flow into the hot air duct of the biomass furnace shows the highest value at a speed of 1.3 m/s of 16.76% with the lowest specific energy consumption (KES) of 51975.7 kJ/kg.
Analisis pengaruh kecepatan udara masuk PAWG terhadap volume kondensat, kinerja sistem, Psys dan COP Ben V. Tarigan; Yohanes V. Gere; Muhamad Jafri; Defmit B.N. Riwu; Dominggus G. H. Adoe
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol 4 No 1 (2023): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v4i1.3432

Abstract

Water is one of the natural resources that is needed for the life of living things. Almost all activities require clean water, both for the metabolism of living things, agriculture and industry and is a major need. So that the availability of clean water sources needs to be maintained and looking for new sources. One source of clean water is atmospheric air which is very abundant. By using a water generator from stable atmospheric air, where the air enters the PAWG system in which there is a thermoelectric which can form a temperature difference in order to convert water into water vapor which then becomes condensate. The PAWG performance tested here is the inlet air velocity with variations of 0.27 m/s, 0.52 m/s and 0.97 m/s. The results show that the inlet air velocity affects the volume of condensate water and the performance of the Psys and COP systems. The higher the air velocity, the greater the volume of condensate water generated and the higher the Psys. But the results are different for COP, where the highest COP occurs at an inlet air speed of 0.52 m/s followed by a speed of 0.27 m/s and the smallest is 0.97 m/s.
Analisis Efisiensi Panel Surya Menggunakan Reflektor Dan Sistem Pendingin Berbasis Mikrokontroler Muhamad Jafri
ROTASI Vol 25, No 2 (2023): VOLUME 25, NOMOR 2, APRIL 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.2.61-69

Abstract

The addition of reflectors to solar panels to redirect solar radiation onto the panel surface can lead to increased surface temperatures. Excessive temperature rise significantly impacts the power output. The implementation of a microcontroller-based cooling system can optimize the temperature on the solar panel surface. The research employs an experimental method on four test media, namely solar panels with reflectors at angles of 45° and 60°, with the addition of a microcontroller-based cooling system, solar panels without reflectors with a cooling system, and solar panels without reflectors or cooling system (as the control). The aim of this study is to determine the efficiency of solar panels using reflectors and a microcontroller-based cooling system. The test results indicate that the intensity of light and temperature also affect the generated power. The microcontroller-based cooling system applied to the solar panel maximizes the power output and efficiency. The solar panel using a 60° reflector with cooling produces a power output of 14.10 Watt with an efficiency of 15.9%, while the solar panel using a 45° reflector produces a power output of 14.07 Watt with an efficiency of 15.4%. The solar panel without a reflector but with a cooling system produces a power output of 13.31 Watt with an efficiency of 14.4%, which is higher than the solar panel without a reflector or cooling system, which only produces a power output of 11.264 Watt with an efficiency of 12.1%.
EFFECT OF SPINDLE ROTATION IN TURNING HIGH CARBON STEEL USING HSS LATHE BLADES ON SURFACE ROUGHNESS AND INTEGRITY OF LATHE BLADES Muhamad Jafri
TRAKSI Vol 23, No 1 (2023): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.23.1.2023.%p

Abstract

This experiment aims to determine the effect of spindle rotation on medium carbon steel turning using an HSS knife, the roughness of the object and the integrity of the blade. In the field of machining, the surface quality of an object can be influenced by several factors such as cutting speed, cutting speed, cutting angle, depth of cut and the material used in the turning process. A good lathe knife must have certain properties, so that later it can produce products with good quality (right size) and economical (short time required). The spindle lathe speed set by the workshop technician for fine-working medium carbon steel is 200 rpm. However, if analyzed using the existing theory, the spindle rotation for medium carbon steel is obtained and for the same HSS lathe, the spindle rotation is 1600 rpm. This can result in surface roughness and defects in the lathe blade, which can vary from small to large. The results showed that the inappropriate selection of spindle rotation when turning medium carbon steel using HSS resulted in defects in the lathe. Defects in the blade affect the surface roughness of the object.
Analysis of intake air temperature effect on performance of portable atmospheric water generation (PAWG) systems with heat sink angle orientation of 75o Muhamad Jafri; Ben Vasco Tarigan; Hairman Sahrudin Lanae
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.3364

Abstract

The increasing demand for clean water and the diminishing supply of clean water sources can result in a clean water crisis. Air is a ubiquitous, inexpensive, and clean water source. Using Atmospheric Water Generators (AWG), the water contained in the air can be extracted. This study's objective was to determine the effect of inlet air temperature and air heater power variations on tool performance and PAWG condensate water production at a condenser angle of 75 degrees. The procedure utilized is experimental on three PAWG boxes. Each box has a distinct temperature at its entrance. The variation of inlet air temperature is accomplished by heating the air before it enters the box with an air heater; the applied power variations are 0.484 Watt, 0.964 Watt, and 1.702 Watt. The results demonstrated that variations in air heater power and inlet air temperature affected system performance and condensate water production. Maximum water discharge and PAWG performance were achieved when the air heating power was 0.48 watts and the water discharge was 1.166 milli liters per hour. At 0.0084 ml/h/W, the PSys system performance had the highest value. The variable air heating power of 0.946 Watt represents the utmost COP value of PAWG. This power variable has a high temperature difference and influences the COP value at high levels.
STUDI EKSPERIMEN PENGGUNAAN SISTEM SEKAT DALAM BOX PAWG (PORTABLE ATMOSFER WATER GENERATOR) TERHADAP: UNJUK KERJA, PRODUKSI AIR,COP, PAWG SISTEM PAKSA Tarigan, Ben Vasco
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2876

Abstract

Air adalah salah satu dari sekian banyak sumber daya alam yang sangat dibutuhkan bagi kehidupan dan keberlangsungan hidup manusia, disamping itu air adalah bagian penting dalam rangka meningkatkan taraf hidup manusia yang ada dibumi dan oleh karena itu air merupakan elemen penting yang tidak dapat dipisahkan dari kehidupan mahkluk hidup, begitu banyak aktivitas manusia dalam kehidupan sehari-hari yang memerlukan air contohnya; masak, mandi, mengairi persawahan dan juga menjadi salah satu sumber penghasil energi listrik. Tujuan yang ingin diperoleh dari penelitian ini yaitu untuk menganalisis, Penggunaan Sistem Sekat Dalam Box PAWG (Portable Atmosfer Water Generator) Terhadap Unjuk Kerja : Produksi Air, Cop, PAWG Sistem Paksa. untuk produksi air tawar dalam waktu 24 jam dari 2 variasi media uji dan Coeffisient Of Performance (COP) yang maksimal. Dan jumlah produksi air untuk 24 jam ialah, variasi media uji dengan perubahan temperatur dan COP yang baik terdapat pada variasi media uji PAWG Tanpa sekat yaitu temperatur tertingginya 47,750C, untuk nilai kelembabannya 53,1% dan nilai COP yaitu sebesar 0,000731 dan jumlah produksi air yaitu sebesar 21 ml selama 24 jam dan perubahan temperatur pada variasi media uji PAWG dengan sekat temperatur tertinggi yaitu sebesar 43,750C, kelembabannya 42,5% dengan nilai COP yaitu sebesar 0,000631 dan jumlah produksi air yaitu sebesar 3 ml selama 24jam pengambilan data.
Analisa Beban Kalor pada Ruang Bagian Kepegawaian Rektorat Universitas Nusa Cendana Oematan, Abraham; Tarigan, Ben V.; Jafri, Muhamad
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 2 No 2 (2015): Oktober 2015
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (106.124 KB) | DOI: 10.35508/ljtmu.v2i2.492

Abstract

Abstrak Perhitungan beban kalor perlu dilaksanakan terlebih dahulu sebelum dilakukan perencanaan sistem pengkondisian udara di suatu ruangan. Hal ini diperlukan karena besarnya beban kalor sangat berpengaruh terhadap kapasitas pendinginan yang dibutuhkan, sehingga kenyamanan dapat diperoleh. Salah satu ruangan yang menggunakan AC adalah ruang Kepegawaian Rektorat Undana. Kapasitas AC yang terpasang adalah 16 PK. Berdasarkan rekening listrik bulanan di gedung Rektorat Undana, biaya pemakaian listrik berkisar sekitar Rp.801.301.531.- per tahun atau sekitar Rp.66.775.128.- per bulannya. Sehingga perlu dilakukan pengamatan kembali terhadap Intensitas Konsumsi Energi (IKE) listrik dari AC apakah masih hemat atau tidak. Berdasarkan hasil penelitian, beban kalor pada ruang tersebut berkisar antara 175.491,3685 Btu/h sampai dengan 306.961,6477 Btu/h. Namun kondisi yang terjadi didapati ada jendela yang terbuka akibatntya infiltrasi beban kalor pada ruang tersebut besar, sehingga membuat 16 PK AC yang terpasang menyerap arus listrik yang besar akibatnya IKE dari 16 PK sebesar 31,06 kWh/m2/bulan, tergolong sangat boros. Apabila tidak ada jendela yang terbuka maka beban kalor puncak yang seharusnya terjadi adalah 125.434,6370 Btu/h, sehingga AC yang seharusnya beroperasi adalah 14 PK. Nilai IKE dari 14 PK adalah 6,63 kWh/m2/bulan tergolong dalam kriteria sangat efisien.
Analisis Performa Pompa Air DAB Tipe DB-125b Sebagai Turbin Dengan Variasi Head Dinamik Nabuasa, Meinase K; Koehuan, Verdy A.; Nurhayati, Nurhayati; Jafri, Muhamad
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 01 (2022): April 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i01.7268

Abstract

The research was conducted through experiments on pumps that functioned as turbines in this study, namely regenerative pumps or peripheral pumps, namely the DAB water pump type DB-125B. Peripheral pump is a centrifugal pump whose impeller has radial blades in bulk of 41 blades. The performance or performance of the PAT system for regenerative pumps or peripheral pumps, namely the DAB type DB-125B water pump as a hydroelectric power plant, was analyzed with variations in flow rates of 35 ltr/min, 40 ltr/min, and 45 ltr/min. The performance or performance of the PAT system of regenerative pumps or peripheral pumps, namely the DAB type DB-125B water pump as a small-scale hydroelectric power plant from experimental results with variations in flow rate shows a maximum shaft power of 5.849 W with an initial discharge at no-load of 40ltr/min. The addition of water power can directly increase the rotation of the PAT shaft, as well as with the addition of the flow rate at the head, the rotation of the turbine rotor also increases. While the addition of the flow rate, the maximum output power and PAT efficiency tend to occur at higher rotations than at low flow rates. The efficiency of PAT in this flow discharge variation reaches its maximum value at turbine rotation of 850.3 rpm of 17.39%, followed by variations of flow rate of 45 ltr/min and 35 ltr/min, each of which is 11.14% at 566.3 rpm and 8.74% at 1440.7 rpm.
Pengaruh Ketebalan Briket Arang terhadap Perubahan Temperatur dan Kelembaban pada Desalinasi Surya Sistem Interfacial Heating Siagian, Saut Ronny Tuah; Jafri, Muhamad; Tarigan, Ben V.; Riwu, Defmit B. N.; Adoe, Dominggus G. H.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 02 (2022): Oktober 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i02.8778

Abstract

Solar desalination is the process of reducing brine salinity by using heat from the sun to produce fresh water. Distillation is one of the traditional solar desalination methods, but it has a low evaporation rate. Recently, interfacial solar evaporation by thermal localization at the liquid interface has been proposed as a promising alternative to evaporation. In this study, briquettes were investigated as as the interface solar absorber to increase vapor production. Experiments were carried out in 4 single-slope type distillers for 8 hours under clear sunlight using 10, 15 and 20 mm thick briquettes. For comparison, we also looked at distiller (basin) with no charcoal. Temperatures and humidity were measured at several position within the basin to identify factors contributing to seawater evaporation. We found that the vapor production increases when temperature is high and humidity is low. While condensation is highly dependent on humidity, high humidity is able to make water vapor molecule reach its dew point faster. This condensation process will greatly impact the productivity of the distillate.
SIMULASI KINERJA BATCH AIR BLAST FREEZER DENGAN MENGGUNAKAN SISTEM REFRIGERAN R404A DAN R1234YF Senu, Stefanus Stef; Dwinanto, Matheus M.; Jafri, Muhamad
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.12245

Abstract

Performance simulation on air blast freezer batches using two types of refrigerants, namely R404A and R123yf. Air blast freezer is a device used in the food and beverage processing industry to cool products quickly by utilizing cold air generated by convection cooling, modeling and simulation of air blast freezer batch systems using computer modeling software. Important variables considered in the simulation include cooling chamber size, airflow velocity, air distribution, and product geometry characteristics. then performed performance analysis using both refrigerants, R404A and R123yf. The use of R123yf refrigerant as an alternative to R404A can also provide guidance in the selection of more environmentally friendly refrigerants without sacrificing system performance. With improved product efficiency and quality, food and beverage processing industries can optimize refrigeration processes and increase their overall productivity.
Co-Authors Alfarisi, Figo Jafri Alionvember R. Thei Aloysius Meo Aloysius V.P. Piamat Ankira E. N. Saputro Apriyanto Banamtuan Arifin Sanusi Bale, Jefri Semuel Ben V. Tarigan Ben V. Tarigan Ben V. Tarigan Ben Vasco Tarigan Ben Vasco Tarigan Charles Silla Daud P. Mangesa Defmit B.N. Riwu Djoe, Daniel Marwill Dominggus Godlief Heryson Adoe Elfridus Bruno Lake Erich Maliwemu, Erich Erkes Lodoh Fransiskus Sogen Gusnawati Gusnawati Gusnawati, Gusnawati Hairman Sahrudin Lanae Ishak Limbong Jahirwan Ut Jasron Jefri Semuel Bale Konstantianus Mone Kristianus Yosafat Goab Kristomus Boimau Kristomus Boimau Lede, Agustinus Syrillus Umbu Margaretha Kewa Unarajan Matheus M. Dwinanto Mohamad Fajri Nabuasa, Meinase K Noveryandy Muda Nurhayati Nurhayati Nurhayati Nurhayati Nurhayati Oematan, Abraham Pardiono, Tri Ramadhani Pell, Yeremias M. Philipus Andreas Rima Nindia Selan Rimas, Dedy Isman Sakaria Koli Sanusi, Arifin Sanusi, Arifin Selan, Rima Senu, Stefanus Stef Siagian, Saut Ronny Tuah Soni A Kaban Stefanus Neno Suparlan, Maria D.C. Tarigan, Ben V Tarigan, Ben V. Verdy A Koehuan Verdy A. Koehuan Wangge, Gusti F.X. Wara Wenseslaus Bunganaen Yakub M. Lanata Yeremias M. Pell Yohanes V. Gere Zakharias S. Nady