LONTAR Jurnal Teknik Mesin Undana

Analisis Pengaruh Variasi Tekanan Pada Briket Cangkang Kemiri Terhadap Temperatur, Laju Pembakaran Dan Kadar Abu

2024-04-30T16:47:49+00:00

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.

Simulasi Kinerja Thermodinamika AC Split Menggunakan Refrigeran R32, R1234yf, dan R290

2024-05-01T02:28:09+00:00

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.

Simulasi Kinerja Termodinamika Refrigerator Dengan Injeksi Cairan Menggunakan R515A Dan R515B

2024-05-01T04:04:58+00:00

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.

Pengaruh Variasi Putaran Motor Penggerak Terhadap Optimalisasi Kerja Pada Alat Shaking Table

2024-05-01T05:21:21+00:00

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.

Variations in Process Parameters for Material Removal Rate Testing with a CNC Lathe in the SKD-11 Steel Finishing Process Using RSM

2024-05-01T06:13:11+00:00

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 Tekanan dan Jumlah Lubang Injektor Terhadap Besar Sudut Semprotan Bahan Bakar Bioetanol

2024-05-01T10:20:40+00:00

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

Perancangan dan Pembuatan Prototype Sauce Pan dengan Metode Pengecoran

2024-06-17T15:12:56+00:00

Sauce pan or commonly called pan is needed as cooking utensils. There are many sauce pan designs according to the advantages offered by a product. A sauce pan design with a minimal manufacturing process is now required. The purpose of this design is to create a sauce pan design and prototype that can be produced in one casting process between the sauce pan body and the handle connector. The sauce pan was designed using CAD and CAE software to determine the strength of the design. The prototype was made using A356 aluminum. A356 Aluminum as raw material for making sauce pan has many advantages. The strength of the sauce pan is obtained by performing a safety factor simulation with a load of 20 N. The sauce pan design has a good safety factor, with 6.8 for design 1, 4.9 for design 2, and 8.3 for design 3.