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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS Jurnal Reka Lingkungan IPTEK The Journal of Engineering IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Jurnal Teknik Kimia Journal of Engineering and Technological Sciences Journal of Energy, Mechanical, Material and Manufacturing Engineering Sewagati Riwayat: Educational Journal of History and Humanities

Gunawan Nugroho

Department Of Engineering Physics, FTI, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111

Author-ID : 333292

Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

Published : 25 Documents Claim Missing Document

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Analisis Thermal Pada Pembangkit Listrik Tenaga Panas Bumi PT. Indonesia Power UPJP Kamojang Kadek Chestha Amrita; Gunawan Nugroho
Jurnal Teknik ITS Vol 7, No 2 (2018)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Pada saat ini PT. Indonesia Power UPJP Kamojang mengoperasikan PLTP dengan kapasitas total sebesar 375 MW, untuk penelitian Tugas Akhir berikut menggunakan unit II pada PLTP Kamojang. Agar memperoleh kapasitas listrik yang optimum maka diperlukan efisiensi yang baik dari proses produksi dengan menganalisa efisiensi thermal dan eksergi serta menghitung biaya kerugian eksergi berdasarkan termoekonomi. Berdasarkan perhitungan yang telah dilakukan, maka didapatkan efisiensi thermal sistem sebesar 19,41%. Dengan eksergi loss terbesar dan terendah pada komponen turbin dan cooling tower sehingga biaya rugi eksergi pada cooling tower bernilai kecil sebesar 7.394.034,76 Rp/bln dan biaya rugi eksergi pada turbin sebesar 252.766.682,24 Rp/bln, untuk nilai efisiensi eksergi yang terbesar pada komponen separator yaitu 99,47% sedangkan efisiensi eksergi sistemnya sebesar 47,06%. Dari hasil tersebut dapat diketahui bahwa efisiensi sistem dipengaruhi oleh performansi masing-masing komponen, dan banyaknya eksergi yang hilang dalam komponen-komponen tersebut. Sedangkan saran yang bisa dilakukan untuk pembangkit listrik yang telah diteliti adalah perlu dilakukannya maintenance secara rutin terhadap komponen turbin serta kondensor dikarenakan memiliki eksergi loss yang cukup tinggi yang akan mempengaruhi efisiensi dari sistem.

Analisis Aliran Fluida Refrigeran 134a Pada Single Blade Rotor Radial Berbasis Computational Fluid Dynamics Ni Putu Rika Puspita Dewi; Gunawan Nugroho
Jurnal Teknik ITS Vol 7, No 2 (2018)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Pemusnahan eksergi pada turbin gas terjadi karena adanya gesekan antara fluida kerja dengan sudu – sudu turbin yang menyebabkan terjadinya pembangkitan entropi pada fluida kerja. Untuk sistem turbin gas dengan fluida kerja yang bertekanan dan temperature rendah, jenis radial turbin tepat diaplikasikan karena mampu beroperasi pada kecepatan tinggi. Dalam penelitian ini dilakukan studi desain geometri rotor turbin tipe radial dengan menggunakan fluida kerja bantu R-134a untuk meningkatkan daya keluaran turbin. Perancangan geometri blade rotor turbin radial menggunakan dua cara yaitu dengan pendekatan numerik dan simulasi CFD. Perancangan dengan pendekatan numerik dan simulasi 3D menggunakan metode yang disarankan oleh Aungier dan Baines. Dari hasil perhitungan Baines, diperoleh daya output rotor turbin hasil perancangan sebesar 10,497 kW. Selain prediksi performansi daya output, dalam perancangan diperoleh penampang meridional dan segitiga kecepatan rotor yang digunakan sebagai input perancangan 3D blade rotor radial. Dengan variasi sudut inlet rotor 0o dan 70o diperoleh perbedaan profil aliran. Pada sudut inlet 70o menghasilkan performa yang lebih baik berdasarkan profil aliran kecepatan dan distribusi tekanan. Karakteristik aliran yang terjadi pada area blade dan sekitarnya yang dibatasi oleh penampang hub dan shroud menyebabkan terjadi aliran turbulen karena nilai densitas dan viskositas fluida kerja yang rendah.

Perancangan Sistem Surge Absorber Untuk Mencegah Terjadinya Waterhammer Pada Pipeline Sistem Pendistribusian Avtur Di DPPU Pertamina - Bandara Ngurah Rai Agung Dwi Sulaksono; Totok Soehartanto; Gunawan Nugroho
Jurnal Teknik ITS Vol 2, No 1 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Aliran fluida transient erat kaitannya dengan fenomena fluida yang dikenal dengan water hammer. Water hammer yang tidak terkendali dapat berakibat buruk pada instalasi sistem perpipaan. Untuk menghindari dampak buruk keberdaan water hammer dapat dilakukan dengan cara memasang komponen perpipaan, salah satunya adalah surge absorber. Sehubungan dengan rencana pengembangan jalur perpipaan serta penambahan kapasitas pompa DPPU Pertamina maka diperlukan kajian mengenai performansi surge absorber yang telah terpasang dan surge absorber yang dibutuhkan untuk mencegah water hammer pada header pit sistem perpipaan DPPU Pertamina yang baru. Kajian tersebut dilakukan dengan cara membuat simulasi yang menmggunakan Method Of Characteristic untuk menyelesaikan persamaan dasar water hammer. Dari hasil kajian yang telah dilakukan, diketahui bahwa delapan buah surge absorber yang terpasang pada sistem perpipaan DPPU Pertamina memiliki volume gas yang masih berada pada range kerjanya . Sedangkan untuk mengatasi water hammer pada jalur pipa tambahan, diperlukan penambahan 4 buah surge absorber yang diletakkan pada sistem perpipaan yang baru.

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

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.

Studi Numerik dan Eksperimental Aliran 3-D pada Kombinasi Airfoil Pelat Datar dengan Variasi Permukaan Bawah dan Pengaruh Celah Gunawan Nugroho; Herman Sasongko
Jurnal Teknik Mesin (Sinta 3) Vol. 7 No. 2 (2005): OCTOBER 2005
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Recently, the complexity of 3-D flow around airfoil/flat plate junction at endwall region has attracted many researchers of Aerodynamics. The majority of its experimental and numerical observations are conducted to compressor cascade. Because of that importance, stronger conceptual basis of 3-D flow is required, so the present study has stressed on single body airfoil/flat plate which clearance effect is exist. Variation of angle of attack and geometry on lower surface in this research have been carried out numerically and experimentally. Numerical study has been implemented by putting inlet velocity 25 m/s as initial condition while air density and viscosity are assumed constants. Trends of coefficient of pressure and velocity vector are studied accurately. Experimental study was conducted in wind tunnel with inlet velocity 25 m/s by means of measurement of static pressure on wall and airfoil which endwall and midspan are included. Two previous methods were supported by flow visualisation in the manner of examining the details of skin friction line. It was evidenced that 2-D history flow was strongly influenced 3-D flow characteristics. It was clarified by lower surface variation and by usage of wider blade thickness model, that was when incoming flow attached to leading edge would experience stronger adverse pressure gradient with the result that separated earlier and so was when it pass more curved surface, stronger adverse pressure gradient is responsible for generating greater pressure difference between upper and lower surface and finally, tip clearance flow is induced more intensivelly. Those effects are amplified when angle of attack is applied. Saddle point is formed further away in front of leading edge and tend to move on pressure side below, Wider branch separation line is detected and jet flow is amplified. Abstract in Bahasa Indonesia : Kompleksnya aliran 3-D pada daerah endwall dan ujung dari kombinasi airfoil/plat datar telah menarik perhatian para peneliti di bidang Aerodinamika pada tahun-tahun belakangan ini. Penelitian aliran 3-D dilakukan terutama pada kompresor kaskade baik secara eksperimental maupun numerik. Oleh karena itu, untuk memberikan dasar yang lebih kokoh, penelitian ini menitikberatkan pada kombinasi airfoil tunggal/plat datar dengan memberikan pengaruh celah. Penelitian ini dilakukan secara numerik dan eksperimental dengan melakukan variasi geometri pada permukaaan bawah dan sudut serang 00. Dalam studi numerik, kerapatan dan viskositas udara dianggap konstan serta aliran masukan sebesar 25 m/s. Parameter- parameter yang diperhatikan dalam analisa adalah tekanan statik, tekanan dinamik, kecepatan, dan tegangan geser. Studi eksperimental dilakukan pada wind tunnel dengan kecepatan aliran masukan 25 m/s dengan daerah pengukuran tekanan statik pada dinding dan badan airfoil yang meliputi ujung dinding, ujung celah dan tengah badan airfoil. Visualisasi aliran dilakukan untuk mendukung studi numerik dan pengukuran tekanan statis dengan melihat detil konfigurasi garis gesekan kulit. Dari penelitian didapatkan bahwa formalisme 2 D flow terbukti sangat mempengaruhi karakteristik aliran 3 dimensi. Variasi permukaaan bawah dan penggunaan model dengan ketebalan bilah yang besar menegaskannya, yaitu aliran yang menuju ujung depan akan mengalami gradien tekanan balik yang lebih besar sehingga aliran akan lebih cepat terpisahkan dan begitu juga jika aliran melewati kontur lebih lengkung, gradien tekanan balik yang lebih besar menginduksikan ujung celah flow yang lebih kuat Kata kunci: Titik sadel, ujung-celah, aliran jet, gradien tekanan balik dan vortex ujung celah.

Studi Numerik Pengaruh Geometri dan Desain Diffuser untuk Peningkatan Kinerja DAWT (Diffuser Augmented Wind Turbine) Adhana Tito Hary Wibowo; Ruri Agung Wahyuono; Gunawan Nugroho
Jurnal Teknik Mesin (Sinta 3) Vol. 14 No. 2 (2013): OCTOBER 2013
Publisher : Institute of Research and Community Outreach, Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Numerical study was conducted on the effect a variation of flange angle on diffuser DAWT performances using Computational Fluid Dynamics (CFD). This research objective is to perform and analyze the flow characteristics such as Velocities profile and static pressure profile on the effect of diffuser’s flat flanged tilt angle. Verification of computation condition result by comparing data qualitative data and quantitive data Ohya’s experiment, (2008). Qualitative analysis showed by velocity contour, streamline contour and velocity vector. Quantitative result showed by the velocity increased profile and static pressure profile graph. The streamline of simulation result showed the bigest blockage effect due to of airflow is flange with angle 900. This effect caused the vortex formation at back side of flange. Velocity vector contour given prediction on direction of stream flow tip losses reduction at the backside of flanged diffuser. Quantitative data showed flow performance in interior diffuser with top increased velocity augmentation of flanged diffuser is angle 900 by 9,82 m/s or 1,96 times freestream velocities and static pressure coefficient value by -2.85.

Monitoring and Analysis of Single Tube Temperature Distribution in Heat Exchanger Simulator Using TPA 81 Thermopile Array Murry Raditya; Gunawan Nugroho; Abdurrahman Rahyang Tutuko; Halen Dinata Atmaja
IPTEK The Journal of Engineering Vol 6, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v6i2.a7246

The Energy and Environmental Engineering Laboratory had a heat exchanger simulator which was used to determine the temperature changes with respect to time due to air velocity. This simulator used tubes which were used to find out the temperature change with time. The working principle of this simulator was to monitor changes in temperature on the tube that had been preheated and then cooled using a fan contained in the simulator. This study performed temperature measurements using a TPA81 thermal array sensor. We chose this sensor because it could measure the temperature without touching the object and had 8 pixels for image measurement. This was because the process of reducing the temperature of the tube becomes purely caused by the fan and not from the outside environment. The results obtained from this study were visualization of temperature distribution using the Thermal Array TPA81 sensor, having a linearity value of 0.034%, a precision value of the instrument of 98.1%, an accuracy value of 0.285%, and error value of 0.154 (W/m2K). For the analysis of temperature distribution, it was concluded that the value of the temperature did not affect the value h, because the value of h (the coefficient of heat transfer convection) is distributed with time.

Performance of Seawater Activated Battery as Alternative Energy Resources Masrufaiyah Masrufaiyah; Ridho Hantoro; Gunawan Nugroho; Totok R Biyanto; Nur Laila Hamidah
IPTEK The Journal of Engineering Vol 3, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v3i1.a2266

Research on Freshwater and Seawater batteries, which using Al and Cu electrodes at variation of different electrolyte salinity, distance between electrodes and flowrate of electrolyte has been carried out. The galvanostatic discharge and Electrochemical Impedance Spectroscopy (EIS) of Al and Cu in seawater were investigated. The results showed the optimum condition with significant average potential discharge of 45,02 mV and current of 0,440 mA obtained from combination of 5% electrolyte salinity, 2 cm space between electrodes and 0,5 liter/hour electrolyte rate. EIS studies revealed that the Al and Cu interficial electrochemical process in seawater was determined by an activation controlled reaction

Simulation Bursting Effects To The Performance Vertical Axiz River Turbine Using Computational Fluid Dynamics Aank Suseno; Ridho Hantoro; Gunawan Nugroho
IPTEK Journal of Proceedings Series No 1 (2015): 1st International Seminar on Science and Technology (ISST) 2015
Publisher : Institut Teknologi Sepuluh Nopember

Turbulent flow in the open channel, often exhibit a phenomenon bursting in expansion or inhibition case. This phenomenon disturbing to the flow at the turbine area. In this study, Research to analyze the occurrence of interference bursting in the river turbine area, done by simulating the river flow with a variety of depths ratio y/L, using vertical turbine NACA 0018 in a trapezoidal channel, with k-ԑ turbulence models in CFD. From the simulation results the smaller ratio of the depth y/L, the force of turbulence flow (bursting flow) at the turbine increases.

Analysis of Spatial Characteristic of Maritime Weather in Java Sea Rachmad Andri Atmoko; Aulia Siti Aisjah; Gunawan Nugroho
IPTEK Journal of Proceedings Series No 1 (2015): 1st International Seminar on Science and Technology (ISST) 2015
Publisher : Institut Teknologi Sepuluh Nopember

Sea transportation continuity is mainly affected by the sea weather. The sea voyage may be disturbed by the unpredictable weather pattern. The rate of shipping accident that is caused by the bad weather shows a high percentage. Accordingly, the study of java sea wave characteristic is required. The java sea waters especially in the north side of Java Island, between Surabaya, Semarang Banjarmasin and Makassar is one of the most dense shipping lanes in Indonesia. Several big harbors such as tanjung perak of Surabaya and tanjung emas of Semarang serve high frequency of stevedoring and passenger loading/unloading. In previous researches, the sea weather predictor of java sea waters is still temporal. In this research, numerical modeling of SWAN is used to models the sea wave propagation direction and significant height of the wave in java sea waters. This model uses the concept of spectral energy balance to describe physical interaction that happened in the sea. Two scenarios are applicated in this simulation. in the first scenario, the input of wind speeds are given from 4 direction (west, north, east and south), while in the second scenario, the wind speeds are given according to the character of seasonal winds of the research object area.

Co-Authors Aank Suseno Abdurrahman Rahyang Tutuko Adhana Tito Hary Wibowo Adia Cahya Purnama Agung Dwi Sulaksono Agus Imam Sonhaji Agus Imam Sonhaji, Agus Imam Agus Muhammad Hatta Akhmad F. Alhikami Akhmad Faruq Alhikami Aulia Muhammad Taufiq Nasution Aulia Siti Aisjah Detak Yan Pratama Eka Puji Kurniawan FITRIA, NOVI Halen Dinata Atmaja Hamidah, Nur Laila Herman Sasongko Heru Mirmanto Hudiyo Firmanto, Hudiyo Iwan Cony Setiadi, Iwan Cony Joko Waluyo Kadek Chestha Amrita Masrufaiyah Masrufaiyah Mohammad Adenan Ni Putu Rika Puspita Dewi Ola Dwi Sandra Hasan Putra, Herlian Eriska Putu Angga Kristyawan Rachmad Andri Atmoko Raditya, Murry Ridho Bayuaji Ridho Hantoro Ruri Agung Wahyuono Sangadji, Anisa Sarwono SATRIYAS ILYAS Sekartedjo Sekartedjo Sukmasari*, Luthfiyah Revi Sukmawati, Wina Ike Sulaiman, Sani Maulana Totok R Biyanto Totok R. Biyanto Totok R. Biyanto Totok Soehartanto Wahyu Hendra W Yusuf Wibisono Zaini, Ahmad

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