<p class="Abstract">The important matter about biogas as an alternative energy source was the presence of hydrogen sulfide (H<sub>2</sub>S) which is very corrosive. The biogas desulfurization process was absolutely necessary to reduce the risk of damage to the equipment. For small-scale applications, the selection of the type of adsorbent became important to reduce additional costs. One alternative material that can be used was iron gram waste. The aim of this study was to investigate the use of iron gram waste resulting from the machining practicum process at the Department of Mechanical Engineering, Politeknik Negeri Semarang as an alternative material for making adsorbents. Iron gram waste was processed into Iron (III) Oxide (Fe<sub>2</sub>O<sub>3</sub>) and Iron (III) Hydroxide (Fe(OH)<sub>3</sub>), formed into billets with an average billet mass of 250 gr. The performance test of the adsorbent in the biogas desulfurization process was carried out under conditions of variation in the flow rate of biogas feed 1, 2, and 3 liters per minute, and the volume of biogas purified in one process was 50 liters. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with a percentage reduction in H<sub>2</sub>S levels contained in the biogas by an average of 82,56%.</p><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script>
Penelitian ini mengkaji Turbin Angin Sumbu Vertikal (Vertical Axis Wind Turbine) Aerofoil NACA 4418 yang memiliki diameter rotor 560 mm, panjang sudu 800 mm, jumlah sudu 3 buah, serta bahan sudu terbuat dari fiberglass. Selanjutnya menganalis karakteristik turbin angin rotor vertikal 3-sudu tersebut pada kecepatan angin berbeda 5 m/s, 6 m/s, 7 m/s, 8 m/s, dan 9 m/s dengan 5 buah model turbin angin dengan bukaan sudut sudu (blade pitch angle) bervariasi yaitu 00, 100, 200, 300, dan 400. Hasil pengujian turbin angin diperoleh rasio kecepatan sudu (Tip Speed Ratio) yang optimum sebesar 1,7 pada sudut sudu 100 dengan putaran turbin 321 rpm dan kecepatan angin 5,42 m/s. Daya mekanik optimum yang diperoleh adalah 19,4 W pada bukaan sudut sudu sebesar 200 dengan putaran turbin 381 serta kecepatan angin 6,4 m/s. Turbin menghasilkan koesifien daya (Coefficient of Power) optimum yang dihasilkan sebesar 0,202 dengan bukaan sudut sudu sebesar 100 dan putaran turbin 198 rpm, dan daya mekanik yang dihasilkan 8,5 Watt pada variabel pengujian kecepatan sebesar 5,42 m/s.
<p>Energi angin merupakan sumber energi terbarukan yang sangat melimpah di Indonesia, karena merupakan negara tropis yang memiliki potensi angin yang cukup besar. Penelitian ini difokuskan pada turbin angin Savonius poros vertikal karena mampu menerima aliran angin dari segala arah. Tujuan penelitian ini adalah membuat turbin Savonius putaran rendah menggunakan generator sinkron permanen magnet untuk meningkatkan kinerja pada kondisi kecepatan angin yang berbeda. Metode penelitian ini adalah merancang, membuat, menguji alat, dan menganalisis kinerja turbin Savonius pada kecepatan angin 5 m/s, 7 m/s, 9 m/s, dan 11 m/s. Turbin Savonius ini memiliki dimensi rangka sudu tinggi 700 mm dan dimensi sudu turbin tinggi 800 mm, lebar diameter sudu 680 mm. Mekanisme transmisi menggunakan v-belt dan pulley berdiameter 60 mm dan 120 mm yang dihubungkan dengan generator sinkron magnet permanen, Sedangkan tinggi rangka penyangga 750 mm dilengkapi denga roda jalan. Hasil penelitian menunjukkan bahwa pada pembebanan 5 W menghasilka putaran generator rata-rata 520 rpm dan daya generator sebesar 5,29 W.</p>
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