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All Journal Sinergi Jurnal Teknik Mesin Scientific Journal of Mechanical Engineering Kinematika Journal of Power, Energy, and Control
Alief Avicenna Luthfie
Universitas Mercu Buana
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS PENGARUH PERUBAHAN SUDUT PIPA SIPHON TERHADAP PERFORMASI TURBIN HYDROCOIL DENGAN MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMIC (CFD) Alief Avicenna Luthfie
Jurnal Teknik Mesin Vol 6, No 1 (2017)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v6i1.1336

Abstract

Dengan dibangunnya waduk, dibangun pula saluran irigasi untuk lahan pertanian. Saluran tersebut dapat diintegerasikan dengan pemanfaatan waduk sebagai sumber energi listrik tenaga air dengan menggunakan sistem Pembangkit Listrik Tenaga Mikro Hidro (PLTMH), dengan catatan tidak boleh mengganggu atau merusak waduk, terutama tanggul waduknya. Pemanfaatan tersebut dapat dicapai menggunakan konfigurasi pipa siphon sebagai penstock. Turbin yang digunakan dalam sistem PLTMH tersebut adalah turbin hydrocoil, turbin ulir dengan panjang pitch yang berubah searah aliran air. Penelitian ini difokuskan pada pengaruh perubahan sudut pipa siphon terhadap performasi turbin hydrocoil. Pada penelitian ini, variasi sudut pipa siphon adalah 45o dan 90o. Penelitian ini dilakukan dengan menggunakan metode Computational Fluid Dynamic (CFD). Hasil penelitian didapatkan bahwa sudut kemiringan pipa siphon 45o memberikan performasi turbin hydrocoil yang lebih baik dibandingkan sudut kemiringan pipa siphon 90o.
DETECTING CLASSIFIER-COAL MILL DAMAGE USING A SIGNAL VIBRATION ANALYSIS Dedik Romahadi; Alief Avicenna Luthfie; L. B. Desti Dorion
SINERGI Vol 23, No 3 (2019)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11403.501 KB) | DOI: 10.22441/sinergi.2019.3.001

Abstract

A classifier plays a crucial role in the cement industry. It is in charge of separating coal that has been smoothened out and is ready to be burned although the coal is still rough after going through the grinding process. It takes a long time to burn coal that is not perfectly processed with a classifier. Therefore, it will reduce the amount of cement production, and the factories will release more energy. The closed arrangement and the number of components in the unit classifier requires a sophisticated method to detect damage that occurs early. Vibration analysis is a method that has been effectively employed in detecting the initial damage that occurs to the engine, especially the classifier. This study was aimed at detecting the location of the damage occurring in the classifier by using a vibration signal analysis and by measuring the magnitude of vibration and presenting it to the frequency domain (spectrum) form using Fast Fourier Transform. Engine condition assessment referred to ISO 10816-3 standard in velocity and displacement modes. Based on data spectrum analysis, the dominant damage laid in the unbalanced rotor. Spectrum characteristics of the damage appeared to be in the spectrum line worth 438.01 μm at a 3.5-Hz frequency (1X) radially. This analysis proved to be supported by the decrease in vibration value to 18.65 μm after balancing the Classifier rotor.
NUMERICAL SIMULATION ON REAR SPOILER ANGLE OF MINI MPV CAR FOR CONDUCTING STABILITY AND SAFETY Alief Avicenna Luthfie; Dedik Romahadi; Hanif Ghufron; Solli Dwi Murtyas
SINERGI Vol 24, No 1 (2020)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (687.676 KB) | DOI: 10.22441/sinergi.2020.1.004

Abstract

Spoiler attached on the rear part of a car can generate drag force and negative lift force, called downforce. This drag force can increase air resistance to the car, meanwhile, a negative lift force can improve the car’s stability and safety. Refer to many researchers, the shape and the angle of the spoiler give different aerodynamic effects and therefore give a different value of drag force and lift force. Based on these facts, this study was focused on the analysis of different spoiler angle attached to a mini MPV car to drag and lift force generated by the spoiler. The method used in this study is a numerical simulation using the Computational Fluid Dynamics (CFD) technique. The analysis was carried out at different spoiler angle and car’s speed. The spoiler angles are -20o, -10o, 0o, 10o, and 20o. The car’s speeds are 40 km/h, 60 km/h, 80 km/h, 100 km/h, and 120 km/h. Then the drag and lift force and their coefficient generated by different spoiler angles were being investigated at specified speeds. The result shows that higher spoiler angles generate higher drag and lower lift. Spoiler angles higher than 0o generate negative lift force, otherwise generate positive lift force. Therefore, to increase a car’s stability and safety, it is recommended to use a spoiler angle higher than 0o. Based on the result, it is best to use spoiler angle 10o because it generates negative lift force with -0.05 lift coefficient and 0,68 drag coefficient.
Numerical analysis of the vortex flow effect on the thermal-hydraulic performance of spray dryer Fajar Anggara; Dedik Romahadi; Alief Luthfie Avicenna; Yosua Heru Irawan
SINERGI Vol 26, No 1 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2022.1.004

Abstract

The use of a spray-dryer is very popular in the drying process in the food and beverage industry. However, due to the properties of the sensitive product that the quality will degrade in drying at high temperature, the innovative design of spray-dryer is developed which can increase the heat transfer rate at moderate temperature. This research was conducted to develop a spray-dryer design to improve thermal-hydraulic performance, with a high transfer rate and low-pressure drop at such a temperature. The design varies by several inlets categorized as design A with one inlet, design B with two inlets, and design C with three inlets. This simulation uses ANSYS FLUENT17, and the independence of the mesh was evaluated to improve the result of the simulation. The efficient mesh number is obtained from the independence of the mesh at around one million. The result shows that design C has the lowest pressure loss and the highest transfer rate due to high vortex and swirl flow generation, improving the mixture quality and direct contact between droplet and dry-air. 
ANALISIS KADAR GAS EMISI CO-FIRING PADA BOILER PLTU INDRAMAYU MENGUNAKAN CAMPURAN SAWDUST Setyoko, Premadi; Luthfie, Alief Avicenna
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 11, No 3 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v11i3.16214

Abstract

Abstrak--Kadar NOx dan CO2 pada PLTU Eksisting di Pulau jawa tidak sesuai dengan aturan pemerintah tentang baku mutu emisi gas buang industri dan efek gas rumah kaca yang ada di Indonesia dan dunia. Kadar gas emisi buang juga harus ditekan sesuai dengan adanya kesepakatan Paris agreement tahun 2021 tentang penurunan nilai ambang batas carbon yang dihasilkan oleh pembangkit listrik berbahan bakar batu bara. Sehingga tujuan dari penelitian ini adalah dapat mengevaluasi komposisi campuran sawdust yang optimal agar dapat dilakukan evaluasi hasil emisi gas buang menggunakan alat Ukur CEMS pada laboratorium lingkungan PLTU Indramayu setelah menggunakan campuran sawdust yang dibakar untuk mengurangi emisi gas buang sesuai standart baku mutu baik nasional dan internasional. Pengujian dilakukan dengan cara eksperimental di PLTU eksisting tipe pulverized coal boiler di PLTU indramayu. Adapun tipe pembakarannya direct firing coal pulverizing system dengan primary cold air pada kecepatan medium dan metode yang digunakan dalam uji co-firing adalah direct co-firing bahan bakar batu bara dan sawdust dicampur di coal yard kemudian ditransfer ke bunker untuk di bakar. Pengujian co-firing dengan persentase campuran sawdust 5% di PLTU Indramayu 3x330 MW unit 2 mendapatkan hasil evaluasi pengujian teknik mixing bahan bakar batubara dan biomassa bisa tercampur dengan baik, Kandungan volatile matter pada biomassa yang lebih tinggi dari batubara juga terpantau aman pada mill outlet temperature FEGT co-firing biomass rata rata cenderung turun 2,80C dibanding kondisi eksisting 100%. Besarnya emisi gas buang baik SO2 maupun NOx pada pengujian Co-firing 5% sawdust di PLTU Indramayu Emisi SO2 turun dari 120,84 mg/Nm3 menjadi 106,3 mg/Nm³, Emisi NOx turun dari 365,41 mg/Nm3 menjadi 360,46 mg/Nm³ memenuhi batas baku mutu emisi KLHK (550 mg/Nm³) Kata kunci: Co-firing, Boiler Pulverizer Coal, Sawdust, Emisi gas buang
SIMULASI UJI BENDING PADA SHAFT GENERATOR AWING 500 WATT DENGAN MATERIAL ASTM A36 MENGGUNAKAN SOFTWARE CAD Raynaldi, Ray; Hamid, Abdul; Luthfie, Alief Avicenna
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 11, No 2 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v11i2.14156

Abstract

Abstrak--Shaft adalah komponen mesin yang berfungsi untuk mentransmisikan daya. Parameter yang diperhatikan dalam perancangan poros pada generator pada turbin angin adalah berat sudu, torsi yang dihasilkan sudu, berat rotor dan gaya sentrifugal. Analisis yang dilakukan pada poros adalah analisis uji lentur dan analisis uji puntir. Material yang digunakan pada poros generator 500 W adalah Baja Ringan (ASTM A36) . Perancangan dilakukan dengan menggunakan metode elemen hingga menggunakan software CAD. Analisis desain yang kemudian dianalisis dengan nilai faktor keamanan desain poros yang diperoleh dari hasil simulasi. poros desain dari hasil simulasi dengan faktor keamanan. Kata kunci: Shaft,Material,CAD
ANALISIS PENGARUH PERFORMANCE LOW TEMPERATURE ECONOMIZER TERHADAP EFISIENSI BOILER 1000 MW DAN BIAYA PRODUKSI PLTU DI SERANG Parwitasari, Fadella Binda; Luthfie, Alief Avicenna
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 12, No 1 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v12i1.16150

Abstract

Low Temperature Economizer (LTE) is a support system for boilers with a capacity of 1000 MW at unit 1 PLTU in Serang which serves to increase the temperature of the feed water by utilizing the heat from the exhaust gases. In 2021, LTE in boiler unit 1 experienced a disruption so that LTE had to stop operating. This has an impact on boiler efficiency and production costs at unit 1 PLTU in Serang, especially on fuel costs. This research was carried out by collecting data on DCS and collecting data in the field, then data processing was carried out. The efficiency calculation method used is direct efficiency calculation, with boiler data retrieval when LTE leaks occur so that LTE stops operating compared to boiler operating conditions with LTE after repair. The coal used is lignite type coal which has a calorific value below 4500 kCal. Boiler efficiency when LTE stops is only 76.04%. This value is smaller than when the boiler operates with LTE which reaches 85.12%. The repair of LTE pipeline leaks can save coal usage by more than 4 tons per hour. Production costs on the use of coal can be reduced to more than Rp. 80,000,000 per day.Keywords: Low Temperature Economizer, Boiler Efficiency, Production Cost
Analisis Energi Kipas Aksial untuk Menghasilkan Kecepatan Angin 50 m/s pada Low Speed Wind Tunnel Sayekti, Mega Esti Suci; Luthfie, Alief Avicenna
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 11, No 3 (2022)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v11i3.16258

Abstract

Terowongan angin (wind tunnel) adalah peralatan yang digunakan untuk melakukan pengujian aerodinamika terhadap sebuah model, seperti pesawat atau mobil. Pada perancangan wind tunnel ini menggunakan tipe open-circuit low speed wind tunnel yang memiliki kelemahan yaitu aliran udara pada test section yang dapat berubah dari laminar ke turbulen. Pada perancangan ini diperlukan analisis kipas hisap agar didapatkan daya motor yang efisien pada test section yang berdimensi 0,42m x 0,42m x 0,84m dengan kecepatan aliran udara maksimal sebesar 50 m/s. Analisis ini bertujuan untuk mendapatkan daya minimal motor untuk menggerakan kipas aksial, kapasitas udara (CHM) di test section, dan mendapatkan nilai koefisien loss yang diperlukan untuk perhitungan daya motor. Perhitungan tersebut diperoleh dari desain wind tunnel yang sudah ada. Pada analisis energi yang dilakukan pada desain wind tunnel Universitas Mercu Buana didapatkan CHM pada test section sebesar 31752 m3/s. Pada seriap bagian wind tunnel terjadi kerugian energi yaitu koefisien loss pada test section =0,0306; contraction cone =0,0157; diffuser =0,0533; settling chamber =0,0109; honeycomb =0,154 sehingga didapatkan = 0,2645; dan total pressure loss = 100,78 Pa. Dari total koefisien loss di wind tunnel didapatkan daya motor minimal untuk menggerakkan kipas aksial adalah 16233 watt atau setara dengan 22 HP.
PENENTUAN JENIS DRAFT TUBE BERDASARKAN NILAI HEAD RECOVERY DAN KINERJA TURBIN HYDROCOIL MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS Hidayat, Fahmi; Luthfie, Alief Avicenna; Biantoro, Agung Wahyudi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 12, No 1 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v12i1.18270

Abstract

A Microhydro Power Plant (MHP) with hydrocoil turbine in Sukajaya Lembang Village, Bandung, West Java, has been successfully designed. However, the velocity of the water flow after exiting the hydrocoil turbine is still relatively high, so there is still a lot of wasted flow energy before it can be converted. Like other reaction turbines, the hydrocoil turbine requires a draft tube in order to maximize its energy conversion process. Thus, the purpose of this research is to determine the type of draft tube based on the head recovery value and performance of the hydrocoil turbine for the MHP system. This determination process involves 3 stages: 1) evaluation of the performance of the hydrocoil turbine that has been installed with three types of draft tubes, namely conical straight, curved elbow, and simple elbow, by Computational Fluid Dynamics (CFD), 2) calculation of the head recovery of the three types of draft tubes, and 3) determination of the best draft tube based on the head recovery value and performance of the hydrocoil turbine. In stage one, the type of analysis used is steady state with the SST k-ω turbulence model, to capture turbulence in the penstock pipe and near the turbine blades. As the results, the highest hydrocoil turbine efficiency with all three types of draft tubes installed, is at a rotational speed of N=1100 rpm. The highest efficiency for the hydrocoil turbine with conical straight, curved elbow, and simple elbow draft tubes are 90.48%, 90.18%, and 91.26%, respectively. Meanwhile, the head recovery at rotational speed N=1100 rpm for conical straight, curved elbow, and simple elbow draft tubes are 1.627 m, 1.866 m, and 4.097 m, respectively. Thus, the simple elbow draft tube is the best to use in this MHP system because it has the highest head recovery and efficiency values.
Melting Process Investigation of KCl Salt as a PCM by Enthalpy-Porosity Simulation Model with Temperature-dependent Physical Properties Hasan, Muhammad Miqdad; Luthfie, Alief Avicenna
Journal of Power, Energy, and Control Vol. 1 No. 2 (2024)
Publisher : MSD Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62777/pec.v1i2.22

Abstract

Salt as a phase change material (PCM) in thermal energy storage (TES) can store solar thermal energy in the form of latent heat by experiencing a process known as the melting process. Recently, the melting process can be observed and investigated using an enthalpy-porosity simulation model. However, the use of enthalpy-porosity simulation model is still focused on constant physical properties, i.e., density and viscosity, of the PCM, and thus, the changes in the physical properties with respect to temperature during the melting process are not included in the simulation process. Therefore, this study aims to use the enthalpy-porosity simulation model with temperature-dependent physical properties of the PCM to investigate the melting process. The salt in this study is Potassium Chloride (KCl), and the computational domain is a concentric tube based on the assumption that the salt is fully contained within the computational domain. The physical properties of the KCl salt (density and viscosity) are set as functions of temperature to include the changes in the physical properties with respect to temperature during the melting process. The simulation results show that the melting process period is 450 s. In addition, the tendency of the melting rate, which is defined as the change in liquid fraction per unit time, is observed to decrease during the melting process. Compared with the constant physical properties of the KCl salt, the melting period of the KCl salt with temperature-dependent physical properties is observed to be shorter, with a deviation of 28.57%.
Co-Authors Abdul Hamid Agung Wahyudi Biantoro Dedik Romahadi Desti Dorion, L. B. Fahmi Hidayat Fajar Anggara Ghufron, Hanif Hanif Ghufron Hasan, Muhammad Miqdad Ibrahim, Nur Syah L. B. Desti Dorion Murtyas, Solli Dwi Parwitasari, Fadella Binda Raynaldi, Ray Sayekti, Mega Esti Suci Setyoko, Premadi Solli Dwi Murtyas Subekti Yosua Heru Irawan