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All Journal Rekayasa Mesin Seminar Nasional Teknik Kimia Kejuangan EMITTER International Journal of Engineering Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN JRST (Jurnal Riset Sains dan Teknologi) Jurnal Ilmu Fisika EPI International Journal of Engineering Jurnal Fisika Indonesia GUYUB: Journal of Community Engagement Automotive Experiences Eksergi: Jurnal Teknik Energi Sewagati
Teguh Hady Ariwibowo
Program Studi Sistem Pembangkit Energi, Departemen Teknik Mekanika Dan Energi, Politeknik Elektronika Negeri Surabaya Jl. Raya ITS, Sukolilo Surabaya 60111 Indonesia
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Evaluasi Kinerja Rotary Air Preheater dengan Metode ε-NTU pada Pengaruh Sudut Seal (Halaman 14 s.d. 17) Wildan Tajudin Alhijri; Teguh Hady Ariwibowo
Jurnal Fisika Indonesia Vol 19, No 55 (2015)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.501 KB) | DOI: 10.22146/jfi.24366

Abstract

Rotary air preheater memanfaatkan gas buang sisa pembakaran pada boiler. Kalor gas buang dipindahkan ke matriks kemudian dipindahkan udara pembakaran. Efektifitas rotary air preheater dipengaruhi oleh sudut seal. Seal berfungsi sebagai pembatas antara aliran panas dan dingin. Efektifitas rotary air preheater dihitung menggunakan metode persamaan ε-NTU. Penggunaan metode ε-NTU memerlukan nilai koefisien perpindahan panas konveksi yang terdapat pada aliran panas maupun dingin. Untuk mendapatkan nilai koefisen perpindahan panas, analisa matriks tunggal dilakukan pada kondisi heat flux konstan. Sudut seal  aliran panas diatur tetap 30°, sedangkan pada aliran dingin diubah mulai dari 0° sampai 120°. Pengaturan sudut seal mempengaruhi luasan permukaan perpindahan panas pada matriks. Kecepatan aliran yang rendah memiliki waktu bersinggungan dengan matriks lebih lama sehingga laju perpindahan kalor meningkat. Pengaturan sudut seal aliran dingin 0° menghasilkan nilai efektifitas tertinggi yaitu 43,7% pada Cr* 24. Nilai efektifitas berbanding lurus dengan nilai NTU. 
THERMODYNAMIC ANALYSIS OF RECUPERATIVE AND REHEAT BASED ON ORGANIC RANKINE CYCLE FOR HIGH-TEMPERATURE WASTE HEAT RECOVERY Fara Nabilah Sakina; Habibatu Nihayah; Teguh Hady Ariwibowo; Lohdy Diana
Jurnal Rekayasa Mesin Vol. 14 No. 1 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i1.1310

Abstract

Heat recovery from available waste heat is an essential method in renewable energy processes due to the ability to generate electricity by using Organic Rankine Cycles (ORC). The process model is developed with the Cycle Tempo software. Fluid properties were analyzed with Reference Fluid Properties (REFPROP) software. This research presents a thermodynamic comparison of the Basic Organic Rankine Cycle (BORC) and Recuperative Organic Rankine Cycle (RORC) for waste heat recovery applications using pure refrigerants R-141b, R-245fa, R-123, and R-21. By performing simulations for heat source high-temperatures ranging from 160 to 200 °C. The comparison between BORC and RORC performance parameters and refrigerant properties was evaluated on the heat source temperature. Research shows that RORC produces higher thermal efficiency but has lower irreversibility than BORC. RORC has a maximum thermal efficiency of 12.67%, and BORC has a thermal efficiency of 11.49% for refrigerant R-141b at a flue gas temperature of 160 °C. The thermal efficiency of the ORC increases as the temperature of the heat source increases.  
EXPERIMENTAL STUDY OF REFRIGERANT REPLACEMENT FROM R-22 TO R-290 HYDROCARBON IN DOMESTIC AC Arrad Ghani Safitra; Prima Dewi Permatasari; Teguh Hady Ariwibowo; Lohdy Diana; Nabila Haninda Az Zahra; Lovyta Putri Adianti
Jurnal Dinamika Vokasional Teknik Mesin Vol. 8 No. 1 (2023)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v8i1.65204

Abstract

Most of the refrigerant used in split-type AC machines is HCFC type R-22, which can potentially damage the ozone layer and global warming. Musicool-22 is a trade name for the hydrocarbon refrigerant R-290, an alternative refrigerant that can replace R-22. Tests were carried out on the test equipment by comparing R-22 and Musicool-22 with the same variation of thermal load. Based on the test, the performance of the two working fluids can be determined by determining the coefficient of performance (COP) and comparing it with various cooling loads. In addition, it is proven that using Musicool-22 can save electrical energy and the power value of the compressor. The data measured are temperature, pressure, voltage, and electric current. Based on the results of calculations carried out by changing R-22 to Musicool-22, it shows that the COP value increases. The highest COP of R-22 is 2.45 at an 80-Watt load, and Musicool-22 is 4.21 at a 320-Watt load. The application of Musicool-22 can save electrical energy by 15.40%. Moreover, it saved electricity usage costs of IDR 44,450.53 per month.
Inovasi Teknologi dalam Budidaya Udang: Penggunaan Water Quality Meter untuk Meningkatkan Produktivitas Udang di Sidoarjo Gunawan, Agus Indra; Ariwibowo, Teguh Hady; Nurmaida, Firnanda Pristiana; Ariyanto, Ferry; Kamaluddin, Muhammad Wafiq; Sanaba, Utari; Habibulloh, Muhamad Aldino; Tambunan, Orlando Pratama
Sewagati Vol 8 No 3 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i3.982

Abstract

Pengabdian masyarakat ini bertujuan untuk meningkatkan kualitas lingkungan perairan yang vital bagi petani udang di Sidoarjo. Dengan memberikan water quality meter kepada para petani, kami berupaya meningkatkan pemahaman mereka terhadap parameter-parameter kritis dalam air yang berpengaruh pada pertumbuhan udang. Melalui serangkaian pelatihan dan bimbingan, petani diberi pengetahuan tentang cara menggunakan alat ini untuk memantau kualitas air secara mandiri. Selain itu, kami juga menyediakan informasi dan panduan praktis dalam mengelola kualitas air secara optimal. Metode yang digunakan dalam pengabdian masyarakat ini melibatkan pendekatan partisipatif, di mana kami bekerja sama dengan komunitas petani udang untuk menentukan kebutuhan mereka dan menyusun strategi yang sesuai. Kami juga melakukan pemantauan berkala untuk mengevaluasi efektivitas alat ini dalam membantu petani mengelola kualitas air secara lebih efisien. Hasil dari pengabdian masyarakat ini menunjukkan peningkatan signifikan dalam pemahaman petani tentang faktor-faktor yang memengaruhi kualitas air untuk budidaya udang. Para petani juga melaporkan peningkatan produksi dan kesehatan udang setelah menerapkan pengetahuan yang didapat dari penggunaan alat ini. Kesimpulannya, pemberian water quality meter dan pendidikan yang terkait membantu petani udang dalam meningkatkan pemantauan dan manajemen kualitas air secara mandiri. Langkah ini dapat berpotensi meningkatkan produktivitas serta keberlanjutan usaha budidaya udang di komunitas ini.
Implementasi Modul Water Quality Meter pada Komunitas Petani Udang Vaname Jawa Timur Nurmaida, Firnanda Pristiana; Gunawan, Agus Indra; Ariwibowo, Teguh Hady; Ariyanto, Ferry; Sanaba, Utari; Habibulloh, Muhamad Aldino; Tambunan, Orlando Pratama; Kamaluddin, Muhammad Wafiq
GUYUB: Journal of Community Engagement Vol 5, No 1 (2024)
Publisher : Universitas Nurul Jadid

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33650/guyub.v5i1.7942

Abstract

Vannamei shrimp is one of the leading commodities in fisheries aquaculture, due to its competitive price and the ability to be mass-produced with high stocking densities. Many coastal communities in East Java capitalize on this opportunity by engaging in vannamei shrimp cultivation. However, most shrimp farmers still measure pond water quality using conventional methods and record water quality parameters on paper, which is highly inefficient. With this issue in mind, the author sought to engage in community service by inviting representatives from the East Java vannamei shrimp farming community. The method involved delivering lectures and interactive discussions with shrimp farmers to understand their perceptions and insights regarding pond water quality, followed by the handover of modules, and subsequently evaluating the modules' usage by the shrimp farmers. As a result of this community service, we introduced a tool to assist traditional shrimp pond farmers in monitoring water quality, in the form of a "Water Quality Meter" module integrated with a website accessible via smartphones and laptops. The "Water Quality Meter" module was designed with a system to portable monitor pond water quality using Internet of Things (IoT) technology, where data obtained by microcontrollers is transmitted to a database to determine the quality value of pond water. Evaluation results indicate that farmers can use the module effectively, and data collected on the website shows that pond water quality for the farmers remains within normal ranges. Shrimp farmers directly benefit from using the module, as the shrimp pond monitoring process becomes more practical and accurate. 
The Effect of the Number of Baffles on the Performance of Solar Updraft Tower: A Numerical Study Ariwibowo, Teguh Hady; Safitra, Arrad Ghani; Ismah, Paradya Nabilah; Hidayatullah, Muhammad Muslih; Amelia, Firyal Nisa
JRST (Jurnal Riset Sains dan Teknologi) Volume 8 No. 2 September 2024: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v8i2.19553

Abstract

Enhancing the amount of flow field and heat transfer characteristic is an effective way to increase the performance of SUT plants. The velocity magnitude and heat transfer characteristic can be increased by adding passive flow control in the form of baffles. This study investigated the SUT prototype's flow field and heat transfer characteristics numerically using one, two, and three baffle variations through 2D axisymmetric analysis with the standard k-epsilon turbulence model using a Computational Fluid Dynamics (CFD) method. The results of the CFD solution obtained profiles of temperature distribution, velocity, streamline, kinetic power, and turbulent kinetic energy of each baffle variation. SUT with two-baffle variation is superior to the others by having a maximum air velocity of 6.248 m/s and increasing SUT performance by 104.769 %, while the three-baffle variation has the highest temperature profile and the most circulating flow effect with an increase in SUT performance of 51.524%. As the number of baffles in the SUT increases, the pressure drop also increases, but the effect of the pressure drop is not significant.
Numerical Analysis of Wave Load Characteristics on Jack-Up Production Platform Structure Using Modified k-ω SST Turbulence Model Gilang Muhammad; Arini, Nu Rhahida; Ilman, Eko Charnius; Ariwibowo, Teguh Hady
EMITTER International Journal of Engineering Technology Vol 11 No 1 (2023)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v11i1.806

Abstract

One of the important stages in the offshore structure design process is the evaluation of the marine hydrodynamic load in which the structure operates, this is to ensure an appropriate design and improve the safety of the structure. Therefore, accurate modeling of the marine environment is needed to produce good evaluation data, one of the methods that can accurately model the marine environment is through the Computational Fluid Dynamic (CFD) method. This research aims to analyze the ocean wave load of pressure and force characteristics on the jack-up production platform hull structure using the (CFD) method. The foam-extend 4.0 (the fork of the OpenFOAM) software with waveFoam solver is utilized to predict the free surface flow phenomena as its capability to predict with accurate results. The Reynold Averaged Navier Stokes (RANS) turbulence model of k-ω SST is applied to predict the turbulence effect in the flow field. Five variations of incident wave direction type are carried out to examine its effect on the pressure and force characteristics on the jack-up production platform hull. The wave model shows inaccurate results with the decrease in wave height caused by excessive turbulence in the water surface area. Excessive turbulence levels can be overcome by incorporating density variable and buoyancy terms based on the Standard Gradient Diffusion Hypothesis (SGDH) into the turbulent kinetic energy equation. The k-ω SST Buoyancy turbulence model shows accurate results when verified to predict wave run-up and horizontal force loads on monopile structures. Furthermore, test results of the wave load on the jack-up production platform hull structure shows that the most significant wave load is obtained in variations with the wave arrival direction relatively opposite to the platform wall. Especially in the direction of 90° because it also has the most expansive impact surface area. Meanwhile, the lower wave load is obtained in variations 45° and 135°, which have the relatively oblique direction of wave arrival to the surface.
Thermal Performance Enhancement of Serpentine Cooling Design Using Branch Modification for Lithium-Ion Batteries Abrari, Arya Rafi; Ariwibowo, Teguh Hady; Pramadihanto, Dadet; Arini, Nu Rhahida; Binugroho, Eko Henfri; Miyara, Akio
Automotive Experiences Vol 7 No 3 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.12709

Abstract

Lithium iron phosphate (LiFePO4) batteries offer advantages such as low cost, safety, environmental compatibility, and stability over repeated cycles. However, when subjected to high currents, this battery generates thermal issues, particularly when arranged in packs. This study aims to maintain the LiFePO4 80Ah battery within an optimal temperature range (20 °C – 40 °C) while minimizing pumping power. The proposed research introduces a serpentine channel with additional branches. The design variations include a gradient in branch spacing and changes in channel width. Each design is evaluated using dimensionless parameters representing maximum temperature, temperature uniformity, pumping power, and cooling efficiency coefficient. The best design from each variation is then compared with the conventional serpentine (CS) channel design, which is well-known for its superior thermal performance. The gradient variation reduces ????????????????∗ and ???????? by 0.07 and by 0.42, respectively, compared to the non-gradient channel design, at a Re 400 and a C-rate 3 C. The design with the largest channel width reduces ????????????????∗ by 0.57 or 11.32 °C compared to the design with the smallest channel width. At a Re 1000 and C-rate 3 C, the reduction in ????????????????∗ for the proposed channel design compared to the CS design is 0.017. In terms of the friction factor (????), the proposed design is 0.0149 lower than the CS design. The results indicate that the thermal performance of the proposed channel design is better than that of the CS design, with reduced pumping power.
Numerical Study of Non-Premixed Combustion Characteristics on Supplementary Firing of HRSG Ariwibowo, Teguh Hady; Ghani Safitra, Arrad; Haidar Fakr, Muhammad; Aghist Fitrony, Muhammad
Eksergi Vol. 18 No. 2 (2022): MAY 2022
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (724.707 KB) | DOI: 10.32497/eksergi.v18i2.3546

Abstract

Computational fluid dynamics (CFD) is a simulation model to provide complex processes in the industry that has been widely used to investigate industrial-scale combustion phenomena. Supplementary firing is used to increase steam production. The non-premixed combustion is a type of supplementary firing. Supplementary firing has seven burners arranged vertically. Supplementary firing uses exhaust steam from a gas turbine to ignite the air. This research investigates the combustion characteristics of flame length and exhaust gas emission at burners. The viscous model was observed by using non-premixed modeling. While the absorption of radiation in the combustion residual gas was observed by using the weight sum-gray gases model (WSGGM). This study used the realizable k-ε model and tetrahedron meshing algorithm to approach the turbulent characteristics. The total nodes and the orthogonal mesh quality in the meshing steps are 1,334,359 and 0.86, respectively. The modeling results show that burners-1 and 7 have longer flame compared to other burners. The combustion exhaust gas has height contents of CO2 and H2O. The velocity near the furnace wall is lower than the center of the furnace, but the pressure is higher. This phenomenon is dominantly influenced by the thermal boundary layer.
The Experimental Study of the Effect of Cooling Pad Surface Shape on Passive Cooling Performance Diana, Lohdy; Safitra, Arrad Ghani; Ariwibowo, Teguh Hady; Riyantoni, Ricko Guntur; Islam, Saiful; Prasetyo, Muhammad Fandi Setiawan Cahyono
invotek Vol 24 No 1 (2024): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v24i1.1173

Abstract

Climate change causes the air conditions inside buildings to increase in temperature. This causes the demand for cooling processes to increase every year. The use of cooling equipment currently requires quite a lot of electricity costs and produces CO2 emissions. The experimental study of the effect of cooling pad surface shape on passive cooling performance to produce a cooling device that is economical and environmentally friendly. The variations of the cooling pad surface were sinusoidal wave and triangular wave. The method was experiments carried out in the laboratory to control environmental conditions. The test results showed that the sinusoidal wave variation had a temperature drop of 1.1 °C lower than the triangular wave. The sinusoidal wave variation has 5% lower relative air humidity than triangular wave variation but air humidity for both variations had increased. Meanwhile, the use of silica sand could not reduce air humidity, it was because of the sum of sand that was used.
Co-Authors Abrari, Arya Rafi Aghist Fitrony, Muhammad Akio Miyara Amelia, Firyal Nisa Arini, Nu Rhahida Ariyanto, Ferry Arrad Ghani Safitra Aulia Arif Shalihuddin Bambang Harjanto Budiman Putra Asmaur Rohman Catur Hilman Dadet Pramadihanto Dewo Sakarum Diana, Lohdy Eko Henfri Binugroho Erik Tridianto Erik Tridianto, Erik Fara Nabilah Sakina Fifi Hesty Sholihah Gilang Muhammad Gunawan, Agus Indra Habibatu Nihayah Habibulloh, Muhamad Aldino Haidar Fakr, Muhammad Hidayatullah, Muhammad Muslih Hilman, Catur Ilman, Eko Charnius Islam, Saiful Ismah, Paradya Nabilah Kamaluddin, Muhammad Wafiq Keishi Kariya Lohdy Diana Lovyta Putri Adianti Miyara, Akio Nabila Haninda Az Zahra Nabila Haninda Azzahra Novan Ardhiyangga Novan Ardhiyangga Novan Ardhiyangga, Novan Nurmaida, Firnanda Pristiana Prasetyo, Muhammad Fandi Setiawan Cahyono Prima Dewi Permatasari Riyantoni, Ricko Guntur Sanaba, Utari Sugit Triyono Sugit Triyono Sugit Triyono, Sugit Tambunan, Orlando Pratama Wildan Tajudin Alhijri