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All Journal ASEAN Journal of Systems Engineering Majalah Forum Teknik UGM Jurnal Teknologi Journal of Engineering and Technological Sciences Indonesian Journal of Chemistry Angkasa: Jurnal Ilmiah Bidang Teknologi Prosiding Seminar Nasional Teknik Mesin Journal of Appropriate Technology for Community Services Airlangga Journal Innovation Management Journal of Mechanical Design and Testing (JMDT) Prosiding Seminar Nasional Teknologi Industri Berkelanjutan Techno SAINTIFIKA
Joko Waluyo
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Studi Eksperimental Turbin Impuls Bi-Directional pada Thermoacoustic Engine dengan Variasi Kelengkungan Sudu Ito, Yonathan; Waluyo, Joko; Sugiyanto, Sugiyanto
Seminar Nasional Teknik Mesin 2019: Prosiding Seminar Nasional Teknik Mesin 2019
Publisher : Politeknik Negeri Jakarta

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Abstract

Turbin adalah suatu alat yang digunakan untuk mengerakkan rotor dengan memanfaatkan aliran fluida dalam pengoperasiannya. Bi-directional impuls turbin dapat dikatakan turbin yang memiliki kinerja cukup tinggi, karena sumber fluida penggerak yang didapat tidak hanya aliran upstream, namun dapat pula memanfaatkan aliran downstream. Thermoakustik engine merupakan suatu alat yang dapat mengkonversi energi panas menjadi gelombang akustik (suara), yang mana gelombang akustik tersebut dapat dimanfaatkan untuk menghasilkan energi lain. Penelitian dilakukan studi eksperimental untuk mengamati kinerja turbin impuls bi-directional yang terhubung ke thermoacoustic engine dengan variasi kelengkungan sudu dan model hub pada turbin. Studi eksperimen dilakukan menggunakan mesin thermoakustik tipe standing wave. Paramater pada thermoakustik engine tipe standing wave yang digunakan dalam penelitian adalah temperatur pada cold heat exchanger dijaga pada temperatur 15o C, temperatur pada hot heat exchanger adalah 450 oC, panjang resonator adalah 400 mm dengan diameter dalam berukuran 52,5 mm, wiremesh ukuran M 10. Turbin impuls bi-directional yang terhubung ke thermoacoustic engine mempunyai spesifikasi Dturbin 50 mm, Dhub 20 mm, dengan variasi kelengkungan sudu (?) 15o, 30o dan 45o, menggunakan guide van bersudut (?) 15o, 30o dan 45o. Hasil penelitian adalah turbin impuls bi-directional dengan varisi kelengkungan sudu pada mesin thermoakustik tipe standing wave memperoleh kecepatan tertinggi pada sudut sudu 15o yang menghasilkan 1613,6 rpm dan torsi (?) tertinggi pada sudu 30o yaitu 0,0001755 kg.m.
UJI EKSPERIMENTAL ORIFICE MULTI LUBANG PADA SALURAN BERDIAMETER 50 MM (EXPERIMENTAL INVESTIGATION OF MULTI-HOLES ORIFICE IN 50 MM DIAMETER PIPE) Waluyo, Joko; Sugiyanto, Sugiyanto
Jurnal Teknologi Vol 6 No 1 (2013): Jurnal Teknologi
Publisher : Jurnal Teknologi, Fakultas Teknologi Industri, Institut Sains & Teknologi AKPRIND Yogyakarta

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Abstract

Penggunaan orifice untuk pengukuran debit aliran sangat lazim digunakan baik di skala laboratorium maupun di perpipaan industri. Selain instalasi yang cukup sederhana, orifice ini memungkinkan untuk pengukuran yang akurat. Keberadaan orifice saat ini tersedia dalam bentuk tipikal dengan lubang tunggal di tengah. Kerugian orifice jenis lubang tunggal ini adalah terjadinya kantung jebakan fluida di dasar perpipaan, yang menyebabkannya kurang sesuai untuk diaplikasikan di aliran dua fasa pipa horisontal. Untuk menghindari terjadi jebakan aliran ini perlu dikaji lanjut bentuk orifice dengan multi lubang. Penelitian ini merupakan pengujian awal terhadap koefisien aliran orifice multi lubang. Pengujian dilakukan dengan variasi 2, 3, dan 4 lubang pada orifice tipe square edge di dalam saluran berdiameter 50 mm. Karakteristik koefisien aliran dilakukan dengan memperbandingkan terhadap persamaan kalibrasi ISO-ASME pada parameter diameter dasar dan diameter ekuivalen. Perbandingan hasil persamaan ISO-ASME dilakukan dengan pengujian statistik. Hasil penelitian menunjukkan bahwa koefisien aliran orifice dengan 4 lubang mampu memenuhi kesesuaian dengan persamaan ISO-ASME. Dari uji signifikansinya didapatkan kecenderungan bahwa diameter ekuivalenya setara dengan konfigurasi di orifice 1 lubang.
Thermal Energy Storage Optimization in Shopping Center Buildings Totok R. Biyanto; Akhmad F. Alhikami; Gunawan Nugroho; Ridho Hantoro; Ridho Bayuaji; Hudiyo Firmanto; Joko Waluyo; Agus Imam Sonhaji
Journal of Engineering and Technological Sciences Vol. 47 No. 5 (2015)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2015.47.5.7

Abstract

In this research, cooling system optimization using thermal energy storage (TES) in shopping center buildings was investigated. Cooling systems in commercial buildings account for up to 50% of their total energy consumption. This incurs high electricity costs related to the tariffs determined by the Indonesian government with the price during peak hours up to twice higher than during off-peak hours. Considering the problem, shifting the use of electrical load away from peak hours is desirable. This may be achieved by using a cooling system with TES. In a TES system, a chiller produces cold water to provide the required cooling load and saves it to a storage tank. Heat loss in the storage tank has to be considered because greater heat loss requires additional chiller capacity and investment costs. Optimization of the cooling system was done by minimizing the combination of chiller capacity, cooling load and heat loss using simplex linear programming. The results showed that up to 20% electricity cost savings can be achieved for a standalone shopping center building.
APPLICATION OF NEWTON – RAPHSON METHOD TO ANALYZE THERMAL EFFICIENCY OF GAS TURBINE BEFORE AND AFTER ENGINE REPLACEMENT Damianus Mario Ricky Fernando; Joko Waluyo; Nugroho Dewayanto
ASEAN Journal of Systems Engineering Vol 4, No 1 (2020): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Gas turbine performance is one of the main concerns in the operating of industrial plants. Thermal efficiency is vital to analyze the performance of the gas turbine. This research purpose is to analyze the gas turbine's thermal efficiency after performed engine replacement in one of the gas industries in Kutai Kartanegara, East Kalimantan, Indonesia. The data was taken during the period from August 2017 to July 2018, while engine replacement was performed in February 2018.  The data were processed to develop simulation models expressing the characteristics of the equipment. The simulation models were then solved simultaneously using the Newton – Raphson Method.  A beneficial advantage of Newton Raphson is that it enables to handle a massive number of data and provides faster iteration compare to other methods.  Based on the simulation results, the thermal efficiency before performed engine replacement was 23.43% with a net power of 18.109 MW and fuel consumption of 1.640 Kg/s. Meanwhile, the development of thermal efficiency after performed engine replacement was 28.24% with a net power of 18.597 MW and fuel consumption of 1.397 Kg/s. This indicates that after performing engine replacement, the thermal efficiency increased by 4.81% and saved fuel by 0.243 Kg/s.
SIMULATION MODEL DEVELOPMENT FOR FIRE WATER PIPING NETWORK WITH NEWTON-RAPHSON ITERATION Ari Ariangga Orranius Putra Patarru; Joko Waluyo; Nur Aini Masruroh
ASEAN Journal of Systems Engineering Vol 5, No 1 (2021): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

The oil and gas industry is an industry that possesses various risks. The most significant risk in this sector is fire. To support the oil and gas production activities, it is necessary to install permanent and non-permanent fire extinguishers to prevent and deal with fire accidents. The firewater network system has a role in supplying flow rates with a certain pressure to protect the production process in a fire. The flow rate and pressure must be able to preserve the process area. Therefore the performance of firewater network system must be monitored. Over time, the performance degradation of the firewater network system is unavoidable.  This decrease is due to scaling or leak minor at pipe and the decreasing performance of the diesel fire pump.This research aims to create a model of simulation fire water network system using newton-raphson iteration. The simulation model that is formed will be used to vary the flow rate against pressure. Based on iteration show the flow rate at platform 4 is 198.9 m3/h. The discharge variation is carried out to see the pressure on platform 4, the variation of the discharge of 2,000 m3/h gives a pressure of 150.45 psig, the variation of the discharge of 1,500 m3/h gives a pressure of 130.85 psig, and the variation of the discharge of 500 m3/h gives a pressure of 24.26 psig. The results of the discharge variation are used to see the performance of the fire water network system. Performance with a discharge of 2,000 m3/h decreased by 9.74%, and performance with a discharge of 1,000 m3/h decreased by 8.81%.
MODEL OF VEHICLE ROUTING PROBLEM WITH SPLIT DELIVERY, MULTI TRIPS, MULTI PRODUCTS AND COMPARTMENTS FOR DETERMINING FUEL DISTRIBUTION ROUTES Dinda Safitri Ramadhani; Nur Aini Masruroh; Joko Waluyo
ASEAN Journal of Systems Engineering Vol 5, No 2 (2021): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

The industrial development in Indonesia encourages companies to have high sensitivity in competing to meet consumer demands promptly by considering minimum distribution costs. One of the factors that can affect distribution costs is route determination. Determining the distribution route is the Vehicle Routing Problem (VRP). The purpose of VRP is to arrange the order of distribution routes to produce a minimum total distance. This study aims to determine the fuel distribution route at TBBM Rewulu in one delivery period to obtain the optimal distribution route and minimize the vehicle mileage. Delivery is carried out using three types of tanker trucks with heterogeneous capacities. This study uses a mathematical model of Mixed Integer Linear Programming (MILP) by considering split delivery, multi trips, multi-products, and compartments.The branch and bound method in the LINGO solver has been used to solve this problem. This model was tested on a simple case using data of 8 customers with different distances and demand shipped by truck. The results obtained indicate that no boundaries are violated, and all consumers are served. The mathematical model built is still general, so it can solve similar cases. A model can be developed for further research by adding VRP variants such as time windows and adding the product types to represent the entire existing system.
POTENTIAL STUDY OF PHOTOVOLTAIC POWER STATIONS TO MEET ENERGY NEEDS OF FUEL CELL UNITS IN BARU PANDANSIMO BARU BEACH OF BANTUL, YOGYAKARTA Ely Afridiana Kuncoro; Arief Budiman; Joko Waluyo
ASEAN Journal of Systems Engineering Vol 5, No 2 (2021): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

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Abstract

Energy needs are increasing rapidly along with population growth, increasing population activity, and massive development in technology. However, a current energy source is mainly from fossil energy. This condition is inversely proportional to fossil energy stock, decreasing year by year as a natural condition of non-renewable energy. On the other hand, fossil energy damages the environment by its pollution, such as deforestation and air and atmospheric pollution in the form of greenhouse gas emissions. For this reason, the world needs another source of energy that could replace fossil energy as a source and is also environmentally friendly. New and renewable energy could be the solution.Indonesia has plenty amount of new and renewable energy potential. However, renewable energy is weather-dependent, thus requiring storage technology to store the energy. The current common storage technology is battery technology. This technology has some weaknesses: limited capacity, high cost, less flexibility, expensive, and short lifetime. Another storage technology with high flexibility, easy transport, high amount capacity, long lifetime, and wide usage is needed. Hydrogen storage appears to meet all these requirements.This study aimed to calculate the optimum potential of photovoltaic power stations at Baru Pandansimo Beach of Bantul, Yogyakarta, as an energy source to produce hydrogen as a storage energy system. The simulations are done using HOMER software were carried out in three photovoltaic power station scenarios: fixed-tilt, single-axis tracker, and dual-axis tracker, and showed that the fixed-tilt photovoltaic power station scenario is the most optimal design and architecture. With total capacity reaching 7.8 MWp potential to be built at Baru Pandansimo, it could generate 11,657,704 KWh/year electrical energy with an NPC value of USD 8.29 M, and a COE of 0.0420 USD/KWh. This electrical energy could produce 213,288.06 kilograms of H2 at a 2.3 USD/kg production cost. 
Karakterisasi Aliran HilirKipas Aksial sudu Datar Variasi Span Sudu dan Sudut Serang Joko Waluyo; Sutrisno S
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Abstract The velocity field downnstream of an axial fan was measured using probe 55 P 51 of a Hot Wire Anemometer to investigate characteristic of the flow. Flat blades werevaried in length of blade's span and angle of attock. The length of blade's span was varied at 0.3, 0'5, 0.75 and l times of 450 mm, at various angles of attack at 5º, 10º and I5º, while it was operated at constant speed of 610 rpm. The measurement was conducted at vertical distances 210, 360, 510 and 660 mm from the fan. The investigation was focused on the mean velocity in axial and tangential directions at measurement position 210 mrn. Properties of theflow were computed based on integration of Reynolds momentum and continuity equations for determining flux of axial and angularmomentum. The performance of the axial fan was determined by comparing values of torque, thrust, volume rate and consumed power. The swirling number of the flow was also calculated as a consideration to determine performance of the axial fan. Results indicate that operating the axial fan in variation blade'sspan have significant effect to the value of axial and tangential mean velocities and the area off low, meanwhile variation in angle of attack just influence to the value of axial and tangential mean velocities. Increasing ofblade's span at constant angle of attack If increases volume rate, torque, and thrust of flow and consumed power oJ'the fan. Investigation of increasing angle of attack at span blade 450 mm also increases those values. Span blade 450 mm at angle of attack l5º have a highest performance and consumed power. It can be shown also that swirling increase with respect to increase of angle of attack. Keywords: velocityfield downstream axial flowfan, span's blade,angle of attack.
Studi Pelelehan PCM di Dalam Tabung Penyimpanan Kalor Pada Solar Water Heater Sistem Aktif Gaguk Marausna; Joko Waluyo
Journal of Mechanical Design and Testing Vol 1, No 1 (2019): Articles
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (507.612 KB) | DOI: 10.22146/jmdt.46744

Abstract

Phase change materials (PCM) mendapat banyak perhatian dalam penggunaannya sebagai penyimpan energi termal karena densitas energi per unit massa/volume yang tinggi. Pemanfaatan PCM sebagai penyimpan energi termal dapat diterapkan pada tangki penyimpan air, solar collector dan pipework terisolasi. Di dalam studi ini parameter pelelehan paraffin wax RT52 yang merupakan salah satu jenis PCM diprediksi menggunakan sebuah model simulasi solar water heater sistem aktif yang berisi susunan kapsul PCM berbentuk silinder banyak. Pemodelan simulasi pelelehan PCM menggunakan metode enthalpy-porosity. Laju aliran heat transfer fluid (HTF) divariasikan dan fluks kalor dijaga konstan 1000 W/m2. Hasil simulasi menunjukkan bahwa laju aliran HTF 4 lpm, 3 lpm, dan 2 lpm memiliki perbedaan waktu pelelehan yang tidak terlalu signifikan yaitu 10,3% dan 5,7%. Perbedaan temperatur antara HTF dan PCM sebesar 7,5 K menjadi titik puncak bagi fluks kalor permukaan yaitu 433,7 W/m2.
Pemilihan provider sand consolidation dengan metode analytical hierarchy process Rony Arjuna; Joko Waluyo; Nur Aini Masruroh
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (707.574 KB) | DOI: 10.28989/angkasa.v13i1.954

Abstract

Salah satu metode sand control yang umum digunakan oleh perusahaan oil dan gas untuk pekerjaan perawatan sumur adalah sand consolidation (SCON). Selama ini, proses pemilihan provider pelaksana pekerjaan dilakukan secara lelang. Kemudian pimpinan departemen dan engineer akan memutuskan providernya. Agar proses pemilihan lebih transparan, terukur dan bisa dipertanggung jawabkan, maka diperlukan suatu sistem pengambilan keputusan yang standar dan kompatibel. Penelitian ini bertujuan untuk mengetahui parameter apa yang menjadi dasar pertimbangan dan merancang sistem pengambilan keputusannya. Metode yang digunakan dalam penelitian ini adalah Analytical Hierarchy Process (AHP). Hasil dari penelitian ini menunjukkan kriteria yang dijadikan sebagai pertimbangan adalah compatibility (0,349), safety & environment (0,229), quality (0,219), cost (0,127), dan service (0,075). Alternatif ST-α2-HL dengan bobot 0,282 merupakan provider terpilih. AHP dapat diterapkan sebagai metode yang sangat baik dalam kasus penentuan best alternatif provider SCON. Perbandingan hasil antara decision maker dan metode AHP jika dilihat dari perspektif best alternatif saja mencapai 100%.
Co-Authors Abdul Karim Zulkarnain Abil Fida Siskayanti Agus Imam Sonhaji Agustinus Winarno Akhmad F. Alhikami Ari Ariangga Orranius Putra Patarru Arief Budiman Bambang Purwono Damianus Mario Ricky Fernando Damianus Mario Ricky Fernando Dinda Safitri Ramadhani Dwi Siswanta Ely Afridiana Kuncoro Gaguk Marausna Gunawan Nugroho Hana Himatul ‘Aliyah Hasan Albana Rhomadhon Heru S. B. Rochardjo Hudiyo Firmanto, Hudiyo Indah Retuwati Ramadhana Johan Syafri Mahathir Ahmad Jumina Jumina Kamalia Fikri Kosmar Marojahan Damanik Mahda Mega Andyka Hieguyta Michael Seen Mochammad Iqbal Nugroho Dewayanto Nur Aini Masruroh Nur Wahyudi Rahmat Bayu Ridho Bayuaji Ridho Hantoro Rony Arjuna Slamet Hariyadi Su Dar mono Sudarmono Sudarmono Sugiyanto - Sutrisno S Totok R. Biyanto Wahyu Wilopo Wahyu Wilopo Yehezkiel Steven Kurniawan Yonathan Ito