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All Journal Jurnal Teknik ITS Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal technoscientia JURNAL PENGABDIAN KEPADA MASYARAKAT EMITTER International Journal of Engineering Technology JURNAL SIMETRIK JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Jurnal Technopreneur (JTech) Prosiding Seminar Nasional Sains dan Teknologi Terapan Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Jurnal Elemen Jurnal Teknik Mesin Jurnal Engine: Energi, Manufaktur, dan Material JURNAL TEKNOLOGI TECHNOSCIENTIA Prosiding SNAST Eksergi: Jurnal Teknik Energi Journal of Mechanical Engineering, Science, and Innovation
Arrad Ghani Safitra
Politeknik Elektronika Negeri Surabaya
Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Numerical Study of Non-Premixed Combustion Characteristics on Supplementary Firing of HRSG Teguh Hady Ariwibowo; Arrad Ghani Safitra; Muhammad Haidar Fakr; Muhammad Aghist Fitrony
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.
Simulasi Lemari Pengering Tenga Surya Dengan Prisma Kaca Menggunakan Computational Fluid Dynamics Lohdy Diana; Arrad Ghani Safitra; Fifi Hesty Sholihah; Ahmad Taufiqurrahman Azhar
Jurnal Engine: Energi, Manufaktur, dan Material Vol 5, No 1 (2021)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v5i1.830

Abstract

Lemari pengering merupakan bagian penting pada pemanas udara tenaga surya. Lemari pengering diharapkan mampu menyimpan panas dalam waktu yang lama. Hal tersebut menyebabkan analisa thermal pada lemari pengering perlu dilakukan. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik termal dan aliran yang terjadi pada lemari pengering. Karakteristik tersebut antara lain distribusi temperatur, perubahan temperatur dan kecepatan, dan pola aliran udara. Metode yang digunakan pada penelitian ini adalah Finite Volume Method berupa simulasi menggunakan software komputasi fluida atau Computational Fluid Dynamics, simulasi menggunakan model tiga dimensi pada kondisi transient dengan time step 0.015. Data simulasi diambil saat 5 detik, 15 detik, 25 detik, dan 35 detik. Hasil simulasi diperoleh perubahan distribusi temperatur udara terhadap waktu yang terjadi pada bidang XY dan bidang XZ lemari pengering. Berdasarkan hasil simulasi diketahui terjadi penurunan temperatur udara. Temperatur udara tertinggi terjadi pada bagian bawah lemari pengering dengan temperatur udara sebesar 331 K. Prisma kaca pada bagian atas lemari pengering mampu memberikan panas pada udara. Terjadi aliran balik di dalam lemari pengering yang menyebabkan udara panas dari saluran masukkan tidak terdistribusi merata.
Studi Eksperimen Performa Helical Darrieus Turbin Farming Lohdy Diana; Prima Dewi Permatasari; Joke Pratilastiarso; Arrad Ghani Safitra
Jurnal Dinamika Vokasional Teknik Mesin Vol 7, No 2 (2022)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v7i2.53500

Abstract

Mengadopsi potensi aliran air bawah laut, turbine farm dapat diterapkan pada saluran irigasi pertanian. Hal tersebut memiliki potensi dan realisasi yang lebih memungkinkan mengingat jumlah area pertanian di Indonesia masih sangat luas. Tujuan dari penelitian ini adalah untuk mengetahui performa turbin. Penelitian ini menggunakan rancang bangun Helical Darrieus Turbine Farm yaitu berupa saluran aliran air dan pembuatan beberapa turbin. Turbin arus laut dengan tipe helical darrieus sebanyak tiga buah diletakkan di dalam water flume. Kondisi dan geometri water flume dilakukan pendekatan sesuai dengan kondisi aktual saluran irigrasi pertanian yaitu kecepatan air 0.4 m/s. Penelitian dilakukan secara eksperimen di dalam laboratorium. Hasil penelitian menunjukkan pada kecepatan putar terbesar yaitu sebesar 22 rpm, didapatkan nilai torsi 0.035 Nm. Hubungan antara tip speed ratio dengan koefisien torsi menunjukkan tren yang meningkat. Nilai tertinggi koefisien torsi hasil pengujian adalah 0.065. Pada TSR maksimal nilai Cp juga maksimal. Koefisien performa maksimal pada turbin sebesar 0.051. Berdasarkan hasil tersebut desain turbin memerlukan modifikasi dengan memperpanjang jarak antar turbin sehingga menghasilkan performa yang lebih tinggi.
AN EXPERIMENT STUDY REPLACEMENT REFRIGERANT R-22 TO HYDROCARBON R-290 ON DOMESTIC AC Arrad Ghani Safitra; Prima Dewi Permatasari; Teguh Hady Ariwibowo; Lohdy Diana; Nabila Haninda Azzahra; 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.v8i1.53588

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.
EXPERIMENTAL STUDY OF THE EFFECT OF PLATE CURVES ON SOLAR STOVE Lohdy Diana; Arrad Ghani Safitra; Agung Dwi Cahyo
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.v8i1.53487

Abstract

In the midst of various other energy needs, cooking has received special attention in energy consumption due to the scarcity of fuel for cooking which is currently commonly used by the community. The scarcity is directly proportional to the increase in fuel prices. Currently, many alternative energies are being developed, one of which is cooking using solar power. In this study, an experimental study of the effect of the number of plate bends on the solar cooker carried out. This study aims to determine the effect of the number of curvatures of the plate on the performance of a solar cooker. The number of curved aluminum plates in the solar cooker was expected to be able to expand the area of absorption of solar heat, thereby increasing the temperature of the air inside the solar cooker. The solar cooker also adds an absorbent plate in the shape of a flower-like arc. Variations in the number of arches to be studied are 6, 8, and 12 arches. The method used in this study is an experiment in actual conditions. Research result show solar stoves with 12 curved walls have a higher temperature increase and heat absorption compared to 6 and 8 arches. This is because 12 arches have a wider solar heat absorption area.
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.
Co-Authors Elby , Alvin Christian Achmad Bahrul Ulum Achmad Setiyawan Agam Sulistyo Agung Dwi Cahyo Ahmad Taufiqurrahman Azhar Aji, Pandu Gautama Amalia, Rif?ah Amalia, Rif?ah Apriani Rosnauli S Aribowo, Teguh Hady Arifin P. P., Moch. Denis Ary Bachtiar Khrisna Putra Ary Bachtiar Khrisna Putra Denny Muhammad Agil Dewi, Naili Husna Diana, Lohdy Eky Novianarenti Erik Tridianto Erik Tridianto Fauziyyah, Inas Nabilah Fifi Hesty Sholihah G. P., Hendrik Elvian Hendrik Elvian G. P. Ikhsan Baihaqi Inas Nabilah F Joke Pratilastiarso Julfan Hafiz Fareza Julianto, Mochammad Arief Kurnia Devi Ariswanda Lohdy Diana Lohdy Diana Lovyta Putri Adianti Moch. Denis Arifin P. P. Mochammad Arief Julianto Mochammad Denis Arifin Pratama Putra Mohammad Basuki Rahmat Muhammad Aghist Fitrony Muhammad Haidar Fakr Muhammad Nabiel Ariansyah Nabila Haninda Az Zahra Nabila Haninda Azzahra Naili Husna Dewi Nu Rhahida Arini Prima Dewi Permatasari Priyambodo Nur Ardi Nugroho Puspitasari, Susi Puspitasari, Susi Qurniawan Zen Al Faris Radina Anggun Nurisma Rif’atus Sholihah Rijalulakbar Dewantoro Rini Indarti Rio Adi Kristian Setyo Nugroho Setyo Nugroho Setyo Nugroho Syariful Hadi, Muhammad Teguh Hady Aribowo Teguh Hady Ariwibowo