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Muhamad Jafri
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LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol 11 No 01 (2024): April 2024" : 15 Documents clear
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.
Pengujian Skala Laboratorium Performa Rotor Turbin Angin Ganda Kontra-Rotasi Melalui Variasi Rasio Geometri PAE, KOSTAN; Koehuan, Verdy A.; Gurnawati, Gurnawati
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.v11i01.14082

Abstract

The aim of this research is to determine the performance of a double rotor counter-rotation wind turbine on the geometric configuration of the CRWT rotor ratio. Tests were carried out on a laboratory scale with a turbine rotor blade model using the S826 airfoil series issued by NREL (National Renewable Energy Laboratory), where the rotor diameter at field scale (full scale) was 0.944 m. The blade is made through a 3D printing process using PLA (polylactic acid) material with an S826 airfoil profile. Laboratory scale testing uses a wind tunnel with test section dimensions of 0.6 m long, 0.3 m wide and 0.3 m high and the wind speed is considered uniform, varying from 3 m/s to 5 m/s. The performance of CRWT with rotor geometry ratio D1/D2 < 1 is better than CRWT with rotor geometry ratio D1/D2 > 1 at rotor distance Z/D1= 0.4. Varying the turbine geometry ratio with a smaller front rotor diameter, the power coefficient of the front rotor turbine is higher than the turbine with a larger front rotor diameter.
Analisis Kualitas Briket Berbahan Dasar Cangkang Kemiri fallo, Gideon; Riwu, Defmit B.N.; Koehuan, Verdy A.
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.v11i01.14285

Abstract

The increasing use of fossil fuels, which is aware of the issue of global warming and environmental damage due to pollution, has increased efforts to develop renewable energy sources. Briquettes are one of the alternative sources of renewable energy that have been developed this decade. This research is part of an effort to develop briquettes, especially hazelnut shell briquettes, as an alternative fuel. Making hazelnut shell charcoal briquettes is carried out by carbonization process using the pyrolysis method. Making starch adhesive (tapioca starch) with a ratio of charcoal powder and starch adhesive (tapioca flour) of 90:10%. Furthermore, the candlenut shell briquettes were tested for proximation tests (ash content, moisture content and calorific value). Candlenut shell briquettes can be used as an alternative fuel because they have a high calorific value of 6061kcal/kg. The hazelnut shell briquettes basically comply with the Indonesian National Standard SNI 01-6235-2000 and the Emission Standards of the Regulation of the State Minister for the Environment Number 05 of 2006 regarding the threshold for exhaust emissions of old motorized vehicles.
Pengaruh Variasi Tekanan dan Jumlah Lubang Injektor Terhadap Besar Sudut Semprotan Bahan Bakar Bioetanol Naitboho, Asriel; Riwu, Defmit B.N.; Dwinanto, Matheus M.
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.v11i01.14287

Abstract

This research aims to determine the effect of variations in pressure and number of injector holes on the spraying angle of bioethanol fuel. Bioethanol fuel has become a promising alternative in reducing dependence on fossil fuels. However, proper spray characteristics are required to achieve efficient combustion and low emissions. In this research, experiments were carried out using injectors with varying numbers of holes, namely 6 holes and 12 holes and varying pressures, namely 30 Psi, 40 Psi and 50 Psi. The spray angle of bioethanol fuel is measured and analyzed using appropriate measuring equipment. The research results show that variations in pressure and number of injector holes have a significant influence on the spraying angle of bioethanol fuel. In this case, increasing the pressure tends to increase the spray angle, while increasing the number of holes tends to reduce the spray angle. This understanding is important in designing an efficient and optimal bioethanol fuel injection system. This research contributes to the development of bioethanol fuel technology and provides insight into the influence of pressure and the number of holes in the injector on spray characteristics
Variasi Parameter Proses Terhadap Pengujian Material Removal Rate dengan Mesin CNC Bubut pada Proses Finishing Baja SKD-11 Menggunakan RSM Saputra, Anggi; Kurniawan, Zaldy; Oktriadi, Yudi
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.v11i01.14735

Abstract

ABSTRAK Mesin CNC Turning dalam industri manufaktur berperan dalam menghasilkan komponen-komponen yang memerlukan ketelitian dan kompleksitas yang tinggi. Peralatan permesinan yang digunakan sangat berpengaruh untuk mengingatkan nilai proses produksi pada dunia manufaktur. SKD-11 mempunyai tingkat ketahanan aus yang tinggi, daktilitas yang baik, sehingga baik dan tepat untuk komponen yang memerlukan presisi dan daya tahan tinggi. Untuk mencapai optimasi dapat digunakan Response Surface Method (RSM) Box Behnken Design, dengan tiga varian yang dapat memperoleh nilai optimasi terbaik. Pada penelitian ini variabel gerak makan dan kedalaman nutrisi merupakan variabel yang signifikan atau mempengaruhi MRR. Dari hasil analisa diperoleh nilai optimasi untuk kecepatan potong 286,238 m/menit, gerak pemakanan 0,19751 mm/putaran, kedalaman pemakanan 0,12486 mm.
Pengaruh Variasi Putaran Motor Penggerak Terhadap Optimalisasi Kerja Pada Alat Shaking Table Sore, Agustinus Seven; Jasron, Jahirwan Ut; Pah, Jack C.A.; Sanusi, Arifin
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.v11i01.14831

Abstract

Indonesia is a country rich in minerals (mining), and iron sand is a source of magnetic material. The tool usually used in iron sand processing is the Shaking Table, a vibrating sieve mechanism that is generated by the force in the rotation of the driving motor for minerals such as metal and sand. This research aims to determine the rotation of the driving motor to obtain good material sieving results. From the test results of 3 kg of iron sand material, the best results were obtained at a rotation of 28.4 Rpm with the result of sieving material in the concentrate category as much as 0.55 kg and in the tailings category as much as 2.45 kg. The greater the pulley ratio, the slower the rotation that occurs on the wheel piston. On the other hand, the smaller the diameter of the pulley, the faster the piston wheel rotates to move the deck-shaking table. This occurs in accordance with the concept of moment of force, the pulley and axle are concentric wheels.
Simulasi Kinerja Termodinamika Refrigerator Dengan Injeksi Cairan Menggunakan R515A Dan R515B Amalo, Alexander C.; Gurnawati, Gurnawati; Dwinanto, Matheus Magnus
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.v11i01.14914

Abstract

This research aims to analyze and compare the thermodynamic performance of refrigerators using two types of refrigerants, namely R515A and R515B, with liquid injection techniques. Refrigerators are important devices in a variety of applications, including the food, pharmaceutical, and household refrigeration industries. This simulation includes important variables such as pressure, temperature, mass flow, and thermophysical properties of both refrigerants. In addition, it also considers fluid injection technique variables such as injection amount, injection time, and injected fluid properties. The research results show a performance comparison between R515A and R515B in terms of thermal efficiency, cooling capacity, and power consumption. It was found that the use of R515B with certain liquid injection resulted in a significant increase in the overall efficiency of the refrigerator system. The results show that proper setting of the injection amount and injection time can optimize the performance of the refrigerator system. Selecting the right refrigerant and liquid injection strategy can produce a more efficient system. This research provides in-depth insight into the thermodynamic aspects of refrigerator systems and illustrates the importance of refrigerant selection and operational techniques in achieving maximum efficiency.
Simulasi Kinerja Thermodinamika AC Split Menggunakan Refrigeran R32, R1234yf, dan R290 Lamawuran, Marianus Adventus; Gurnawati, Gurnawati; Dwinanto, Matheus Magnus
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.v11i01.14937

Abstract

Split AC is the process of regulating temperature, humidity, cleanliness, and air distribution in a room so as to achieve thermal comfort conditions for the occupants in it. The purpose of this research is to simulate the thermodynamics of a Split AC using environmentally friendly refrigerants R32, R1234YF, and R290 using Genetron Propertis software version 1.4.1. The method used in this study is a standard air conditioning performance simulation using R32, R1234YF, and R290 refrigerants with Genetron Propertis software version 1.4.1. The simulation results of the basic cycle refrigeration system performance with the working fluid R32 for the condensation temperature are maintained constant, because the temperature of the refrigerant gas through the condenser must be higher than the ambient temperature, condensation occurs in the condenser, so that the refrigerant changes form to liquid. From the simulation of the split AC thermodynamic performance, an increase in the evaporation temperature will have a significant impact on increasing the consumption of pumping power, increasing the mass ratio, and COP in the system.
Analisis Pengaruh Variasi Tekanan Pada Briket Cangkang Kemiri Terhadap Temperatur, Laju Pembakaran Dan Kadar Abu Tonda, Naptalia; Jasron, Jahirwan Ut; Pell, Yeremias M.; Mangesa, Daud P.
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.v11i01.14971

Abstract

In the process of making briquettes, there are still obstacles, namely, the printing process still uses traditional methods, and the existing briquette printing equipment is also not equipped with a hydraulic system and pressure gauge, so it requires more printing time. It cannot know how much pressure is applied during printing. A briquette printing machine equipped with a hydraulic system and pressure gauge is needed to simplify the briquette printing process and save energy. The aim of designing this briquette printing machine is to produce a press machine design with a hydraulic system equipped with a pressure gauge. The design method used in this research is the Shigley-Mitchell method. This briquette press has a length of 350 mm, a width of 450 mm, and a height of 840 mm. The mold cylinder has 16 mold cylinders. In one printing cylinder, it can produce briquettes weighing 52 grams with a height of 80 mm, so in one printing, this tool, with a printing time of 6.5 minutes, can produce 0.832 kg briquettes. The capacity of this briquette press per hour is 148 briquettes/hour.
Modifikasi Modifikasi Rotor Pada Alat Pemecah kemiri Tipe Bentur Fallo, Florianus; Pell, Yeremias M.; Pah, Jack C.A.
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.v11i01.15715

Abstract

This article illustrates preparation of your paper using MS-WORD. Papers should not be numbered The rotor bar is part of the candlenut breaker tool that separates the candlenut flesh from the shell. On the rotor there is a candlenut seed intake groove which is adjusted to the size of the candlenut seed. These grooves will carry the candlenut seeds to rotate and collide the candlenuts on the wall of the stator bar which is attached to a wooden board as a support for grinding the candlenut seeds. The distance between the rotor and the wall must be adjusted in such a way as to get the desired results.

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