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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 216 Documents
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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.
Pengaruh Penggunaan Sistem Sekat Dalam Box Portable Atmospheric Water Generator Terhadap Unjuk Kerja Produksi Air, Efisiensi, COP, Pawg Sistem Alami Suparlan, Maria D.C.; Jafri, Muhamad; TARIGAN, Ben Vasco
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.13275

Abstract

2.1 billion people can’t have access to water, and 4.5 billion with insufficient sanitation or clean water sources. While water is extremely useful for everyday, such as washing, cooking, bathing etc. So fulfillment of water needs must balanced with increase the addition of population can be fulfilled. this study, was carried out experimentally by testing on 2 variations media, media test with insulation and media test without insulation, at 30 minutes intervals, temperature was measured in box to identify factors affect condensation process at several points. Obtained from research analyze effect using partition system on PAWG indications for water production, efficiency, COP, natural PAWG systems for fresh water production within 24 hours from 2 variations of media and maximum Coefficient of Performance. Water amount production for 24 hour, the variation of media with changes in temperature and good COP is found in variation media with insulation, the highest temperature is 36.750C, the humidity value 66.3% and COP value 0.230769 and amount water production is 16 ml, and temperature change in variation of media without insulation with the highest temperature is 39.50C, humidity is 65.4% with a COP value 0.02 and the amount of water production is 12 ml.
Karakterisasi Minyak Hasil Pirolisis Berbahan Dasar Limbah Plastik Jenis Polypropylene (PP) Adoe, Dominggus G. H.; Satria, Devi Yola; Sanusi, Arifin
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.13435

Abstract

This research was conducted to determine the characteristics of plastic waste pyrolysis oil and compare it with the characteristics of gasoline. The things studied included the physical and chemical properties of pyrolysis oil. The physical properties studied included viscosity and density, while the chemical properties were the heating value. The research was conducted using Polypropylene (PP) plastic, the reactor used was a single reactor with the reactor temperature set at 300 and 3500C. The results showed that the calorific value of pyrolysis oil was 0.194068464 J – 0.209067264 J, the density was 0.7941 – 0.8083 kg/l and the viscosity was 0.9500151572 cPs - 0.9651967743 cPs.
Pembuatan Komposit Matrik Aluminium Diperkuat Silicon Carbida Dan Rice Husk Ash Dengan Metode Metalurgi Serbuk Dylan, Arise Graafian; Sugiyarto, Sugiyarto; Wanto, Agus; Budi, Abdul; Sukanto, Sukanto
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.13481

Abstract

Brake lining components that contain asbestos are dangerous for human health, so innovation materials environmentally friendly is needed. This research aims to determine the effect of volume fraction and sintering temperature to density and hardness of recycled aluminum matrix composites, reinforced with silicon carbide and rice husk ash using the powder metallurgy method, with varying reinforcement volume fractions 10%, 15%, and 20%. The powder mixing process uses a mechanical alloying method, while the hot compaction process uses a two-way pressing method with a hydraulic pump machine compaction pressure of 6000 PSi. The sintering temperature was varied at 550°C, 580°C, 610°C. Density testing refers to Archimedes' law with the ASTM B 962-17 standard, while hardness testing uses Portable Brinel with the ASTM E110-14 standard. The density and hardness test results show that the value increases with the amount of matrix used. For samples volume fraction 90%, the highest density value is 1.72 g/cm3 and the highest hardness value is 40HB. Based on microstructural analysis, this condition occurs because the relatively low duration of the powder mechanical alloying process has resulted in agglomeration of the reinforcing powder, and the impact interlocking bond becomes lower with increasing reinforcing powder used.
Studi Eksperimen dan Simulasi Termodinamika Mini Refrigerator Dama, Firdaut Loja; Adoe, Dominggus G. H.; Dwinanto, Matheus Magnus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.13648

Abstract

Household refrigeration machines (fridges) are household appliances that are widely used in families in Indonesia. However, the use of working fluids still uses this type of working fluid which causes thinning of the ozone layer and global warming. Therefore, this research aims to analyze the effect of evaporation temperature on work coefficient and exergy efficiency by using R600a working fluid as an environmentally friendly fluid. This research uses experimental and simulation methods using Cooltols software. The research results show that increasing the evaporation temperature has an impact on increasing the work coefficient, the heat absorbed by the evaporator but reducing the compressor power, and the heat released by the condenser. The greatest increase in exergy destruction is found in the evaporator, where exergy efficiency increases. So R600a is very suitable for use in refrigerators.
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.
Rancang Bangun Alat Pencetak Briket Dengan Sistem Hidrolik Nafie, Andri; Jasron, Jahirwan Ut; Tobe, Adi Y.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14107

Abstract

Briquettes are an alternative energy source to replace dependence on fossil fuels such as kerosene. However, in the process of making briquettes, there are still obstacles. 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 purpose 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 an experiment using the Shigley-Mitchell method. The results of the analysis of the maximum stress of the material for 150 kg pressure on the frame 2,565x107 N/m2, the press cylinder 1,932x106 N/m2, the upper press piston 8,830x102 N/m2, the lower plunger piston 2,392x107 N/m2, and the maximum stress for the loading pressure on the connecting lever 1,433x107 N/m2, the pressing lever 2,873x108 N/m2, the material yield strength value 6,204 x 108 N/m2.
Modifikasi Dinding Bentur Dan Perlakuan Awal Pada Alat Pemecah Kemiri Manoh, Luter Imanuel; Pell, Yeremias M; Selan, Rima Nindia
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14118

Abstract

Masalah yang dihadapi para petani adalah pada pemecah cangkang kemiri yang dibuat sebelumnya masih memiliki kekurangan yaitu dari segi produksi, Proses pemecahan biji kemiri biasanya dilakukan oleh masyarakat secara konvensional yaitu menggunakan palu karet, dari prinsip kerjanya secara manual tentu cara ini tidak terlalu efektif dari sisi tenaga dan waktu. Oleh karena itu sudah dirancang mesin pemecah cangkang kemiri secara mekanik, agar proses produksi bisa berlangsung dengan produksinya yang lebih besar. Hal ini perlu di modifikasi dinding bentur dan perlakuan awal pada alat pemecah kemiri sehingga memperoleh hasil yang lebih baik yaitu isi kemiri utuh diharapkan lebih banyak dari isi kemiri yang hancur.
Studi Pengaruh Temperatur Evaporasi Terhadap Kinerja Siklus Rankine Organik Menggunakan Fluida Kerja R245FA Dan R515A Dwinanto, Matheus Magnus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 02 (2023): Oktober 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i02.14231

Abstract

Nowadays, many power plants with the organic Rankine cycle (ORC) have been widely used in the world because they can utilize low temperature heat sources such as industrial waste heat, biomass, geothermal and solar energy. The working fluid for the ORC system must meet several physical property criteria including, environmentally friendly, non-flammable, non-toxic, and non-corrosive. Therefore, this study aims to analyze the effect of evaporation temperature on the energy performance of a standard organic Rankine cycle with a turbine power of 20 kW with working fluids R245fa and R515A. System simulation using Genetron Properties software with the condensation temperature maintained constant at 40oC and the evaporation temperature varied at 70 – 80oC. The results of this study show that increasing the evaporation temperature will greatly increase pumping power consumption but reduce the pressure ratio in the turbine and the thermal efficiency of the system. The pumping power used to circulate R515A is ±2.2 times higher than circulating R245FA but the thermal efficiency is ±9.75% higher.
Simulasi Kinerja AC Split Menggunakan R32, R410A, R290, dan R1234YF Dwinanto, Matheus M.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.14245

Abstract

Air conditioning (AC) is the treatment of air to regulate temperature, humidity, cleanliness and comfortable conditions needed by humans in a room. The lecture room in the Mechanical Engineering building at Nusa Cendana University is a building that is quite busy with lecture activities and services related to students. Therefore, it is necessary to have an air conditioning system to maintain thermal comfort for students and lecturers who carry out activities. This research aims to analyze the performance of the cooling system using refrigerants R290 and R1234YF as alternative refrigerants to replace refrigerants R32 and R410A using CoolTools software version 1.01. The simulation is based on steady state conditions with the AC cooling load being 5.3 kW. The results of this simulation show that the performance of an air conditioning system that uses R290 and R1234YF as an alternative refrigerant can be used because it has a better performance coefficient than refrigerants R32 and R410A

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