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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
Arjuna Subject : -
Articles 965 Documents
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ANALISIS MODIFIKASI DESAIN REAKTOR PADA RANCANG BANGUN ALAT PIROLISIS DAN PENGUJIAN NILAI KALOR UNTUK PLASTIK PP DAN ABS Wijayanto, Rudi Purwo; Alhikam, Francois Rubian; Hendrawan, Iyus
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1493

Abstract

The increasing use of plastic results in a rise in the volume of waste each year and has an impact on the environment. Pyrolysis is a method for recycling plastic waste into fuel oil. Improvements in pyrolysis design and techniques continue to be made to obtain better performance and optimal results. In this study, we compare the rate of increase in heat and volume of oil produced from two pyrolysis device designs. The alpha version is the previous version of the pyrolysis apparatus with a flat plate roof reactor and without the addition of an insulator on the tube wall. While the beta version is a modification of the alpha version with a conical roof reactor with the addition of calk material on the tube wall. Modification of the pyrolysis apparatus was also carried out in the condensation section. The beta version of the pyrolysis device shows better performance, where the reactor temperature reaches 250 ⁰C, while the alpha version, which is the previous version, reaches a maximum temperature of 220 ⁰C in a longer time. The volume of oil produced by the beta version is 0.11 mL/gram of polypropylene plastic, whereas the alpha version produced only 0.01 mL/gram for the same material. The test results for the calorific value of polypropylene (PP) plastic waste were 43.838 MJ/kg, while for acrylonitrile butadiene styrene (ABS) it was 44.772 MJ/kg.
DESIGN AND TEST THE PERFORMANCE OF THE WATER HEATER BY UTILIZING THE EXHAUST HEAT OF THE LABORATORY SCALE AIR CONDITIONER Gunarto, Gunarto; Eko Julianto; Muhammad Iwan
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1494

Abstract

The purpose of this research is to design and test the performance of a water heater unit that works based on the exhaust heat of the ½ PK Split Air Conditioner condenser which will be used as a power source to heat water with a capacity of 60 litres based on standard hot water temperature. for bathing at 40-45 oC according to the type of use SNI 03-7605-2005 concerning procedures for planning plumbing systems. It is hoped that this research can serve as a guideline for designing a water heater derived from an exhaust heat condenser using a Helical-Coil type heat exchanger. This research uses descriptive research with a quantitative approach. Descriptive research in this study is intended to obtain an overview and information regarding the utilization of an exhaust heat condenser with the addition of a water helical coil heat exchanger and the working process of an air conditioner water heater that utilizes condenser waste heat to produce hot water that can be used for bathing needs. From the test results, the water heater can work well as evidenced by an increase in water temperature reaching 44.40 C in 70 minutes. The energy value in the form of heat that can be utilized by adding a water heater is 1.14785 kJ/second, with a water heater efficiency of 76.23%. Thus the utilization of the air conditioner condenser wastes heat energy and is quite effective for heating water. To be able to save water use for household, business, industrial and other needs that use Air conditioners as air conditioning.
ANALISIS KARAKTERISTIK ALIRAN MELALUI PENAMPANG PERSEGI PANJANG MENGGUNAKAN MODEL TURBULEN LARGE EDDY SIMULATION (LES) Barata, La Ode Ahmad; Samhuddin, Samhuddin
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1495

Abstract

Dynamic response, fatigue, and stability issues of a structure are closely related to flow behavior past a bluff body structure. Flow past the free-end rectangular prism is investigated numerically using a Large Eddy Simulation (LES) turbulence model at Re = 22000. The prism model has a constant depth (D) to width (H) ratio D/H = 0.5 for span length variation L (= 10; 7,5; 5,0 and 2,5H). Effects of the free end on the flow characteristics showed that the flow pattern, velocity vector, and fluid forces component are changed. The presence of the free end is closed related to the flow characteristics alteration in the wake, which is presented graphically in this paper. This study suggests the critical aspect ratio of the slender rectangular is 2,5<L/H<5,0 The prism with critical aspect L = 2,5H presented an unusual flow behavior among the test models. The dynamic response of the test model affects the flow pattern in the wake, which is indicated by alteration of the region and intensity of vorticity, velocity vector, hydrodynamic force components, and other local components.
ANALISIS KONSUMSI ENERGI LISTRIK PADA PEMBANGUNAN NUWSP BIYONGA KABUPATEN GORONTALO Boli, Rahmad Hidayat; Pido, Rifaldo; Arbie, Mohamad Rifal; Rauf, Wawan
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1496

Abstract

The need for electrical energy today is starting to increase along with the increase in population and rapid development, but inversely proportional to the progress or innovations in increasing renewable energy. Given that this renewable energy can be developed continuously and operational costs are relatively cheap, the electricity that relies on coal (fossil) over time will run out and cannot be renewed, the discussion concerns the supply of PLN supplies. So that in this study the focus is on the utilization of electrical energy for the NUWSP development area of Gorontalo Regency Biyonga Village and calculating the total consumption needs of the electrical energy used. After research and data analysis, the results obtained are 189 kVA or 189,000 vA, the total peak demand with load is 3 units of centrifugal pumps, 10 points of room lighting, and 12 points of lighting around the building, the results of the analysis obtained became a reference and suggested to install electrical energy with a capacity of 197 kVA or 197,000 vA with the consideration that when development occurs, the demand for electrical energy is still sufficient from what is installed.
MODEL 3D IMPLAN LUTUT FEMUR DARI REKONSTRUKSI TULANG LUTUT DENGAN METODE REVERSE ENGINEERING BERBANTUAN PEMINDAI CT-SCAN Harun, Suryadiwansa; Ismunandar, Helmi; Burhanuddin, Yanuar; Supriyadi, Satrio Darma
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1498

Abstract

As a person ages, usually after age 50, knee joint bone damage caused by osteoarthritis can occur. It is to cause pain in the knee joint so that its function moves abnormally. The knee joint bone damage could be replaced with a prosthesis (Total Knee Replacement, TKR) to restore the knee joint's normal movement function. However, orthopaedic doctors sometimes have difficulty choosing standard implant designs available for patients' knees when performing TKR surgery, especially for Asian patients, including Indonesians. It is due to the geometry of the standard implant being different from the patient's knee anatomical shape. As a result, postoperative pain reactions can occur. Therefore, this study is to customize the TKR femoral implant's design according to the knee bone's geometry, especially in Indonesian patients. Reverse Engineering (RE) technology assisted by the CT-Scan and the boundary surface technique was applied for reconstructing the patient's knee bone into a femoral implant. The application of RE is initially, the patient's knee bone sample was scanned with Computer Tomography (CT) Scan. Then, the femur implant model was designed on the surface of the patient's knee bone using the boundary surface method. The 3D model of the TKR femoral implant was successfully designed to match the geometry of the patient's femur bone. It will be a reference for designing other TKR implants, namely the tibia component.
CARBON SIZE AND TEMPERATURE EFFECTS TO JIS S45C CARBURIZED STEEL Ekaputra, I Made Wicaksana; Wibisono, Yustinus Akas; Haryadi, Gunawan Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1499

Abstract

Wear on a metal can be naturally found in components that operate in a friction environment, such as in a transmission system. However, it can be a substantial problem when the wear rate is not within the permitted limit. Surface hardening is a popular way to improve surface wear resistance for metals with various parameters that can be controlled during the process. In this study, pack carburizing was conducted for plain carbon steel JIS S45C. The carburizing process is conducted on the steel by varying the carbon size and temperature during the heating process. The carbon size consisted of mesh sizes of 5 and 15. The heating process was conducted for 2 hours at 800oC and 900oC. The carbon media and catalyst used in this study were coconut charcoal and calcium carbonate (CaCO3). In addition, the hardness Vickers test was conducted to evaluate the surface hardness. It was found that the hardness of Vickers increased with an increase in heating temperature and mesh size of carbon.
PENGARUH KOMPOSISI LAPISAN NI-CR PADA BAJA ASME SA 210 C TERHADAP LAJU EROSI SUHU TINGGI Utomo, Slamet Prasetyo; Darmadi, Djarot B.; Widodo, Teguh Dwi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1501

Abstract

The purpose of this study was to determine the high temperature erosion rate of the NiCr coating on ASME SA 210 C steel using the combustion oxy fuel thermal spray method. In Circulating Fluidized Bed (CFB) boiler, there is circulation of fly ash, silica sand and air in a high temperature environment which causes erosion. High temperature erosion can be minimized by using Ni-Cr alloy coating sing the combustion oxy fuel thermal spray method. NiCr alloy is proved a able to provider a metal alloy layer composition that can withstand temperatures of 600°C with a fly ash impact speed of 200m/s. The metal alloy compositions that have been studied are NiCr, NiCrCo, NiCrWc, NiCrWcCo, and NiCrCoMo. The results of this study indicates that metal alloys are generally atteche to the substrate and withstand at a high temperatures (600°C). The highest hardness provide by NiCrWcCo alloy which is 177.46 HV. The lowest hardness is found in the composition of the NiCrCo alloy (161.71 HV). The lowest high temperature erosion rate was found in the NiCrWcCo alloy, which was -0.00481 gram/minute. This low erosion rate because the NiCrWcCo alloy produces a good weeting effect for metal alloys and has a high hardness value.
EVALUASI KINERJA DIRECT EXPANSION SOLAR-ASSISTED HEAT PUMP WATER HEATER KAPASITAS 30 LITER DENGAN MENGGUNAKAN REFRIGERAN R134A Irawan, Teguh; Mainil, Rahmat Iman; Aziz, Azridjal
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1502

Abstract

Experiments were carried out to determine the performance of a direct expansion solar assisted heat pump water heater (DX-SAHPWH) which mainly consists of an evaporator panel with a surface area of ​​0.23 m2, a rotary compressor with an input power of 122.5 W, an insulated water tank that has been wrapped around a condenser with a diameter of 0.024 m and a length of 15 m and a capillary tube with a diameter of 0.001 m and a length of 1.61 m. Tests were carried out in open spaces, enclosed spaces and air-conditioned rooms exposed to direct sunlight. The results of this test are that the highest coefficient of performance (COP) on the DX-SAHPWH system is obtained at 1,25 and the smallest COP is obtained at 0.60. The higher intensity of solar radiation has a positive effect on the performance of the DX-SAHPWH system, which results in the heat transfer rate at water (Q wm) increases, the time required for heating is faster, and the COP of the DX-SAHPWH system increases.
UJI EFISIENSI ANODA KORBAN PADUAN ALUMINIUM DAN ZINC MENGGUNAKAN STANDAR UJI DNV RP-B401 TERHADAP VARIASI TEMPERATUR ELEKTROLIT Rohmannudin, Tubagus Noor; Sulistijono , Sulistijono; Kusuma, Willy Deviet; Sitorus , Grace Aghata
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1503

Abstract

Corrosion is a decrease in metal quality caused by electrochemical reactions with the surrounding environment. Corrosion is destructive, dangerous, and can cause great losses. Corrosion cannot be stopped but its rate can be controlled. There are many methods that can be used to control the rate of corrosion, one of them is the sacrificial anode cathodic protection. Protection of anode cathodic sacrificial utilizes the principle of a galvanic cell where the metal will be protected or the cathode has a higher potential otherwise the metal will be sacrificed or the anode has a lower potential value. One of the standard practices used to design cathodic protection is DNV RP-B401. By carrying out tests according to the DNV RP-B401 standard, then it can be seen the value of the efficiency of the sacrificial anode working on cathode protection. The efficiency of the sacrificial anode needed to be known to measure the performance of the sacrificial anode in providing protection to the metal to be protected. This research was conducted to determine the effect of differences in electrolyte temperature on the efficiency values of aluminum alloy and Zinc alloy sacrificial anodes. In this study the feasibility test was carried out using electrolyte temperature variations, namely at temperatures of 20°C, 25°C, 30°C, and 35°C. the efficiency results obtained in aluminum alloys for temperatures of 20°C, 25°C, 30°C and 35°C were 88.6%, 80.66%, 76.55% and 63.23%. Then for the Zinc alloys with the same temperature variations were 92.95%, 90.39%, 88.15%, and 77.24%.
EFFECT OF COMPRESSOR INLET TEMPERATURE ON THERMAL EFFICIENCY ROLLS ROYCE RB211 GAS GENERATOR IN COMBINED CYCLE POWER PLANT Yulistio, Nanang; Wahyudi, Muhammad Prihadi Eko; Fitriyah, Qoriatul
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1505

Abstract

The combined cycle power plant must operate 24 hours without stopping so that in operation at any time an increase in the temperature of the gas generator RB211 can occur. The RB211 gas generator works well when the ambient temperature is low. The X combine cycle power plant uses a chiller to lower the inlet air temperature so that the air entering the compressor will be lower. The purpose of this study was to analyze and conclude the effect of the compressor inlet temperature on the thermal efficiency of the Rolls Royce RB211 gas generator in the combined cycle power plant. Data was collected by requesting historical data on September 5-11, 2022 in the central control room. The method used in this study is simple linear regression analysis because it only involves two variables. The independent variable is the inlet temperature of the compressor and the dependent variable is the thermal efficiency of the gas generator. It is known that the highest efficiency is at a temperature of 292,94 kelvin with a thermal efficiency value of 36,87% while the lowest efficiency is at a temperature of 301,89 kelvin with a thermal efficiency value of 35,61%. The regression analysis equation is Ŷ = 0,60665231-0,00082223X so the hypothesis results obtained through the significant F test with F table is that there is a significant effect between the compressor inlet temperature on the thermal efficiency of the gas generator.

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