Articles
<![CDATA[Penerapan mesin pemisah bunga cengkeh pada petani di Desa Bonto Enrekang ]]>
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Nur Wahyuni]]>;
<![CDATA[Moh. Adnan]]>
<![CDATA[ DEDIKASI Vol 21, No 2 (2019): Jurnal Dedikasi ]]>
Publisher : <![CDATA[Universitas Negeri Makassar ]]>
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DOI: 10.26858/dedikasi.v21i2.11483
<![CDATA[One agricultural commodity that has high economic value is the clove "Eugenia Aromatica". The many benefits obtained from cloves, making clove commodities sell well in the market due to of high demand. Therefore, the amount of clove production must be able to balance the market demand in order to keep price stability stable. However, post-harvest handling of cloves at the farm level is generally conventional. This has caused problems including long working time (ineffective), the risk of clove quality decreases, and causes discomfort to the skin of workers' hands due to friction of the clove flower for long time. Hence, it is necessary to conduct IbM – “Ipteks bagi Masyarakat” (Science and Technology for Communities) activities in utilizing clove flower separator machines for farmers in Bonto Village, Enrekang. The stages of the implementation of the IbM activities were observation to the farmer groups in Bonto Village, procurement of clove flower separators, conducting training to operate the clove separator mechine and counseling how to do mechine maintenance to farmers in Bonto Village. The results obtained from this community service activity are that clove farmers in Bonto village are able to work more effectively and efficiently in the process of separating clove flowers from their stems so that the production of cloves increases with good quality.]]>
<![CDATA[Pengaruh Desain Interior Diffuser Terhadap Peningkatan Performa Diffuser Augmented Wind Turbine (DAWT) ]]>
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Muh Iqbal Mukhsen]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 5, No 2 (2018): October 2018 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v5i2.573
<![CDATA[The main objective of numerical simulation in thisstudies is to determine the effect of diffuser’s interior design onincreasing the diffuser augmented wind turbine (DAWT)performance by observing wind velocity increment. Numericalstudies were carried out using the computational Fluid Dynamics(CFD) method through a two-dimensional steady approach withAnsys Fluent 18.2 and Ansys Workbench 18.2 software. Thepresent studies spesifically investigate the shapes of diffuser,namely flat diffuser and curved diffuser. The studies demonstratethat the curved diffuser generates stronger increment of the windvelocity than flat diffuser (at centreline), which 1.842 times thefreestream velocity, while the flat diffuser is only able to increseup to 1.742 times the freestream velocity. The curved diffusershows the highest increment of the average wind velocity alongdiffuser with the greatest increment of 78.66 % and the flatdiffuser is only able to provide average wind velocity incrementup to 44.81%. The curved interor of diffuser is able to enlarge thewake area, so the effect of the suction flow entering the diffuserbecomes stronger. Therefore, curved diffuser is better to provideDAWT performance improvements.]]>
<![CDATA[Studi Numerik Steady RANS Aliran Fluida di Dalam Asymmetric Diffuser ]]>
<![CDATA[Yiyin Klistafani]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 4, No 1 (2017): April 2017 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v4i1.100
<![CDATA[Research on fluid flow becomes a necessity to develop technology and for the welfare of human beings on earth. One of them is study of fluid flow in the diffuser. The example of diffuser application is used as a flue gas duct in the car or motorcycle. In addition, diffuser is also applied in air conditioning systems. Diffuser is a construction that able to control the behavior of the fluid. The increasing of cross section area in the diffuser will generate a positive pressure gradient or also called adverse pressure gradient (APG). The greater APG that happens, the greater energy required by the fluid to fight it, because APG will lead to separation. This study aimed to evaluate the numerical fluid flow in the asymmetric diffuser with divergence angle (θ) = 10 ° (upper wall) and widening one vertical side (α) of 20 ° (front wall). The Reynolds number is 8.7 x 104 by high inlet diffuser and the maximum velocity at the inlet diffuser. Turbulence models used are standard k-ɛ, realizable k-ε, and shear stress transport (SST) k-ω. Numerical study of steady RANS used Fluent 6.3.26 software. Results of numerical visualizations show that huge vortex established in diffuser, that’s why performance of diffuser is not optimal. In addition the location of separation point shown by SST k-ω is earlier than other turbulence models (standard k-ε and realizable k-ε).]]>
<![CDATA[Karakteristik Aliran Fluida di Dalam Asymmetric Diffuser dengan Penambahan Vortex Generator ]]>
<![CDATA[Yiyin Klistafani]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 5, No 1 (2018): April 2018 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v5i1.195
<![CDATA[A numerical investigation of asymmetric diffuser which equipped with vortex generator is presented. The investigation is aimed to know fluid flow characteristic in asymmetric diffuser which equipped with vortex generator on the up side of its diverging wall and to determine the effectiveness of using vortex generator on diffuser performance. Numerical investigation method was done by using Computational Fluid Dynamics (CFD) method with Fluent 6.3.26 software and with software of GAMBIT 2.4.6 to designed geometry and discriminated (meshing) it. The procedures performed on numerical investigation were pre-processing, solving, and post-processing stages. The results show that the flow of fluid simulated shear stress transport (SST) k-ω did not suffer a deflection toward the straight wall shortly at the time when entering the diffuser. Standard k-ε predicted the flow was deflected when entering the diffuser. Addition of vortex generator was not able to reduce the amount of adverse pressure gradient effect that occurred within the diffuser so using vortex generator was not effective to improve diffuser performance.]]>
<![CDATA[Analisis Efisiensi Turbin pada Pembangkit Listrik Tenaga Minihydro (PLTM) Malea di Kabupaten Tana Toraja ]]>
<![CDATA[Jumadi Tangko]]>;
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[A Khayrunnisa]]>;
<![CDATA[Reza Risaldi Robby]]>
<![CDATA[ Jurnal Teknik Mesin Sinergi Vol 17, No 2 (2019): Oktober 2019 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v17i2.2074
<![CDATA[Malea Minihydro Power Plant in Tana Toraja district is the only one power plant that supplies electricity directly to Malea Hydropower Project. This analysis provides an explanation or description of the circumstances of power plant under study ranging from waterways to the performance of Francis turbine. Aims to find out the efficiency that produced by turbine and factors that influence the turbine efficiency. In this research, the turbines studied were unit 1 and unit 2. Data obtained from measurement results and annual data of Malea Minihydro Power Plant with documentation. The results showed that every year there was a decreasing in turbine efficiency both in unit 1 and unit 2. This is caused by the reduced performance of some components of turbine. As for the turbine unit 1 the largest turbine efficiency value in 2012 is 98.40%, turbine efficiency value in 2016 is 83.30%, and smallest turbine efficiency value in 2018 is 79.37%. On turbine unit 2 the largest turbine efficiency value in 2012 is 97.46 % and the smallest turbine efficiency value in 2016 is 77.35 %. In 2017 and 2018 turbine unit 2 no longer operate due to damaged bearing. The result showed that efficiency value of Malea MiniHydro Power Plant Tana Toraja less efficient in generating electricity. This is caused by the PLTM have been operated since 2012 and there was no maintenance that done regularly.]]>
<![CDATA[Rancang Bangun Sistem Pengolahan Air Umpan Boiler Untuk Pengembangan Praktikum Sistem Pembangkit II ]]>
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Rezki Arsal]]>;
<![CDATA[Rahmawati Rahmawati]]>
<![CDATA[ Jurnal Teknik Mesin Sinergi Vol 19, No 1 (2021): April 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v19i2.3026
<![CDATA[Penelitian ini bertujuan untuk menyediakan fasilitas sistem pengolahan air umpan boiler (water treatment) yang sesuai dengan sistem PLTU di Laboratorium Konversi Energi. Adapun langkah-langkah rancang bangun ini diawali dengan survey lapangan, studi literatur, desain kemudian perakitan sistem pengolahan air umpan boiler. Pengumpulan data dilakukan dengan pengujian pada air baku dan air umpan boiler kemudian pengujian filter pasir silika, sedangkan analisa data dilakukan dengan membandingkan data hasil pengujian dengan standar air umpan boiler yang ada. Hasil yang diperoleh yaitu tersedianya sistem pengolahan air umpan boiler dengan menggunakan filter pasir silika dan unit pelunak air yang mampu mengubah sifat air baku dari sadah menjadi lunak. Berdasarkan hasil pengujian sistem pengolahan air umpan boiler, karakteristik air hasil olahan sudah memenuhi standar air umpan boiler, kecuali pada parameter pH.]]>
<![CDATA[Analisis Kinerja Kiln dengan Menggunakan Campuran Batubara dan Sekam Padi Sebagai Bahan Bakar Alternatif pada Pabrik PT. Semen Tonasa ]]>
<![CDATA[Muhammad Anshar]]>;
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Isdayanti Iskandar]]>
<![CDATA[ Jurnal Teknik Mesin Sinergi Vol 19, No 2 (2021): Oktober 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v19i2.3381
<![CDATA[The cement industry is one of the energy intensive industries, because it absorbs a large amount of energy, and the kiln is the heart of the thermal energy system which is used as a place for combustion and clinker formation, therefore efforts are needed to determine the effect of using rice husk fuel on additional energy needed for combustion in the kiln and knowing the magnitude of the effect of adding rice husks on coal savings. This research was conducted to collect operational data of kiln which was obtained from the Central Control Room (CCR) Unit of Tonasa IV Factory of PT. Semen Tonasa. Data is taken directly on a computer which functions to regulate the operation of all production processes at the Tonasa IV Factory. The results of the analysis show that the use of rice husks has a relatively small effect on the energy produced when compared to without using rice husks. The addition of rice husk fuel does not show a significant effect on coal savings, but using rice husks can provide a calorific value of 3300 kcal / kg. In 1 kg of rice husk contains a calorific value of 3210 kcal / kg while in 1 kg of coal contains a heating value of 4910 kcal / kg, it can be seen that 1 kg of rice husk can replace approximately 1.53 kg of coal.]]>
<![CDATA[Sistem Monitoring Debit Inflow untuk Operasi Harian Pembangkit PLTA Bakaru ]]>
<![CDATA[La Ode Musa]]>;
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Rudi Sumarwanto]]>
<![CDATA[ Jurnal Teknik Mesin Sinergi Vol 18, No 1 (2020): April 2020 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v18i1.2239
<![CDATA[Tingginya kebutuhan akan sumber daya energi listrik menuntut manusia untuk memanfaatkan sumber energi yang terkandung di alam sebaik mungkin. Pemanfaatan energi terbarukan menjadi sumber energi listrik merupakan salah satu upaya yang harus di tingkatkan, Indonesia memiliki potensi air cukup besar yang bisa dimanfaatkan menjadi sumber energi listrik, sumber energi listrik yang berasal dari energi air mempunyai beberapa masalah salah satunya dalam memaksimalkan penggunaan air pada bendungan, perencanaan yang baik akan memaksimalkan penggunaan air untuk pembangkitan. Adapun tujuan dari penelitian adalah membuat sistem monitoring debit inflow untuk operasi harian pembangkit PLTA Bakaru. Pengambilan data penelitian ini berlokasi di PLTA Bakaru. Data diperoleh dari data pencatatan harian, laporan Bulanan dan laporan Pengusahaan. Pengambilan data penelitian ini dilakukan secara realtime pada data bendungan PLTA Bakaru mulai Januari tahun 2015 sampai dengan Desember 2016, yang diambil persetiap satu jam sekali pada bendungan yaitu data elevasi bendungan, pemakaian pembangkitan (discharge), debit air yang masuk ke bendungan (Inflow) serta data limpasan pintu bendungan. Sistem monitoring debit inflow untuk operasi harian membantu operator dalam perencanaan pola operasi harian berdasarkan debit inflow dan pemakaian air yang digunakan untuk pembangkitkan. Pola operasi harian merupakan salah satu faktor yang penting untuk meningkatkan hasil produksi. Sistem monitoring tersebut dapat mensimulasikan untuk perhitungan elevasi,waktu tampung air dan debit inflow. Berdasarkan hasil penelitian maka di dapatkan bahwa sistem monitoring debit inflow untuk operasi harian sangat berguna untuk megoptimalkan sistem pengoperasian PLTA bakaru, mengurangi range start stop sehingga lifetime peralatan dapat tercapai demikian pula Capacity factor (CF) dapat ditingkatkan.]]>
<![CDATA[Analisis Pengaruh Input Nilai Kalor Batubara Terhadap Kinerja Boiler Tipe CFB Pada PLTU PT. Antam Tbk ]]>
<![CDATA[Jumadi Tangko]]>;
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Esra Marten]]>
<![CDATA[ Jurnal Sinergi Jurusan Teknik Mesin Vol 20, No 2 (2022): Oktober 2022 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v20i2.3772
<![CDATA[boiler is a closed vessel where the heat of combustion is transferred to the water until it forms hot steam or steam. The boiler used in the PT ANTAM PLTU is a CFB type, where the operator at the PLTU ANTAM Tbk performs heating value input to determine the amount of coal and combustion air used. The analysis of the effect of the input heating value is expected to be taken into consideration in knowing the effect of the heating value input which is different from the heating value of coal supplied to the furnace, which is viewed from the side of pressure and temperature, which affects the physical boiler, boiler work efficiency, heat losses in the boiler. and also boiler life time. From the results of research and analysis of efficiency calculations where there is the largest difference in the value of efficiency directly at 1.161935% at the start of operation and 1.20276% in March 2020 between calculations with GCV of coal and input of heating value. Meanwhile, the largest difference in efficiency was indirectly 0.085689% at the start of operation and 0.09224% in March 2020. Meanwhile, the largest difference in total heat losses at the beginning of operation was 0.09245% and in March 2020 was 0.69317%. ]]>
<![CDATA[Prototipe Sistem Gate Otomatis pada Bendungan PLTA ]]>
<![CDATA[Sukma Abadi]]>;
<![CDATA[Yiyin Klistafani]]>;
<![CDATA[Sitti Nurlatifa]]>;
<![CDATA[Jeri Christanto]]>
<![CDATA[ Jurnal Sinergi Jurusan Teknik Mesin Vol 21, No 1 (2023): April 2023 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/sinergi.v21i1.4175
<![CDATA[This study aims to make a prototype mechanism for opening and closing the gate on a hydropower dam using the Arduino Uno microcontroller. The research was conducted by making two gates (gate-1 and gate-2) which will open or close based on the water level of the dam. Gate-1 and gate-2 will close if the water level of the dam does not exceed the limit for immediate reduction. The test was carried out with variations in the conditions of water entering the dam, namely calm water conditions, heavy water conditions, and low water conditions. From the tests carried out, it was found that gate-1 always opens when the water level reaches 8 cm or more, while gate-2 opens when the water level starts to reach 11 cm. The length of time gate-1 and gate-2 open according to the water level of the dam.]]>
