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"Sampai saat ini, sebagian besar sumber energi masih berasal dari energi tak terbarukan yang dapat memicu peningkatan emisi gas buang berbahaya, salah satunya, yaitu gas karbon monoksida (CO). Teknologi penyisihan gas berupa kontaktor membran dapat menjadi solusi alternatif karena keunggulannya yang memiliki area kontak yang luas dengan ukuran kontaktor relatif kecil, serta konsumsi energi dan biaya relatif rendah dibandingkan dengan teknologi konvensional. Penelitian ini berfokus pada proses absorpsi gas buang mesin diesel (CO) menggunakan modul membran serat berongga polysulfone sebagai perangkat perpindahan massa dengan bantuan pelarut Tembaga (II) Klorida (CuCl2) dan Trietilamina (TEA) sebagai absorben. Gas buang mesin diesel akan dialirkan pada bagian tube membran, sedangkan pelarut berada di bagian shell dan bersifat statis. Variabel bebas yang diuji pada penelitian ini adalah laju alir gas umpan dan konsentrasi pelarut CuCl2. Berdasarkan data hasil penelitian dengan laju alir gas umpan yang konstan sebesar 100 mL/menit dan konsentrasi perlarut CuCl2 tertinggi 1 M diperoleh efisiensi penyisihan gas CO dan fluks tertinggi berturut-turut senilai 70,09 % dan 2,628x10-6 mmol/cm2.s, sementara pada konsentrasi CuCl2 terendah 0,01 M diperoleh CO loading tertinggi sebesar 1,031 mmolCO/molCuCl2.s. Kemudian, dengan konsentrasi pelarut CuCl2 yang konstan 0,1 M, didapatkan efisiensi senilai 61,41% pada laju alir gas umpan terendah 100 mL/menit, sementara fluks dan CO loading tertinggi yang dapat dicapai berturut-turut sebesar 1,978x10-6 mmol/cm2.s dan 7,767x10-2 mmolCO/molCuCl2.s pada laju alir gas umpan tertinggi 200 mL/menit.

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Until now, most energy sources still come from non-renewable energy which can lead an increase in harmful exhaust emissions, one of which is carbon monoxide (CO). The gas removal technology such as membrane contactor can be an alternative solution because of its advantages in having a large contact area with a relatively small contactor size, as well as relatively low energy consumption and low cost compared to conventional technologies. This research focuses on the absorption of diesel engine exhaust gases (CO) using polysulfone hollow fiber membrane modules as a mass transfer device and with the support of solvents Copper (II) Chloride and Triethylamine (TEA) as absorbents. Diesel engine exhaust gas will flow through the membrane tube, while the solvent is static in the shell section. The independent variables tested in this study are feed gas flow rate and CuCl2 solvent concentration. Based on research data with a constant feed gas flow rate of 100 mL/minute and the highest CuCl2 concentration of 1 M, the highest CO removal efficiency and flux were obtained respectively at 70.09% and 2.628x10-6 mmol/cm2.s, while at the lowest CuCl2 concentration of 0.01 M, the highest CO loading was obtained at 1.031 mmolCO/molCuCl2.s. In addition, with a constant CuCl2 concentration of 0.1 M, gas removal efficiency of 61.41% was obtained at the lowest feed gas flow rate of 100 mL/minute, while the highest flux and CO loading that could be achieved were respectively 1.978x10-6 mmol /cm2.s and 7.767x102 mmolCO/molCuCl2.s at the highest feed gas flow rate of 200 mL/minute."

"Penggunaan bahan bakar biodiesel sebagai alternatif bahan bakar fosil pada mesin diesel menjadi salah satu solusi untuk mengurangi emisi gas rumah kaca dan mendukung diversifikasi energi. Penelitian ini menganalisis pengaruh variasi campuran biodiesel terhadap performa dan emisi gas buang pada mesin diesel Kubota RD85 DI-2S melalui simulasi satu dimensi menggunakan perangkat lunak Avl Boost. Simulasi dilakukan pada campuran biodiesel B20, B35, B50, dan B100, serta solar murni (B0). Hasil simulasi menunjukkan bahwa tekanan silinder maksimum tertinggi dicapai oleh bahan bakar B0 yaitu sebesar 8726,2 kPa pada fuelling 25,85 mg/injeksi, sedangkan campuran biodiesel B20, B35, B50, dan B100 menghasilkan tekanan silinder lebih rendah. Efisiesi thermal, pada rentang fuelling 10–30 mg/injeksi, B0 menunjukkan efisiensi termal tertinggi dibanding campuran biodiesel lainnya. Namun, pada fuelling tinggi 35 mg/injeksi, efisiensi termal B20 dan B35 dapat mencapai 33,7%, sedikit melebihi B0 yang hanya mencapai 33,58%. Secara keseluruhan, biodiesel B50 dan B100 mampu menghasilkan emisi soot, CO, dan CO2 yang lebih rendah dibandingkan bahan bakar lainnya. Dengan demikian, penelitian ini memberikan gambaran mengenai potensi biodiesel sebagai bahan bakar alternatif yang lebih ramah lingkungan, serta menjadi dasar evaluasi performa dan emisi mesin diesel di masa depan.

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The use of biodiesel as an alternative fuel for diesel engines has become one of the solutions to reduce greenhouse gas emissions and support energy diversification. This study analyzes the effect of various biodiesel blends on the performance and exhaust emissions of the Kubota RD85 DI-2S diesel engine using one-dimensional simulation with AVL Boost software. Simulations were carried out for biodiesel blends B20, B35, B50, and B100, as well as pure diesel (B0). The simulation results showed that the highest peak cylinder pressure was achieved by B0 fuel at 8726.2 kPa with a fueling of 25.85 mg/injection, while the biodiesel blends B20, B35, B50, and B100 produced lower cylinder pressures. In terms of thermal efficiency, within the fuelling range of 10–30 mg/injection, B0 shows the highest thermal efficiency compared to other biodiesel blends. However, at a higher fuelling rate of 35 mg/injection, the thermal efficiency of B20 and B35 can reach 33.7%, slightly exceeding that of B0 at 33.58%. Overall, B50 and B100 biodiesel blends were able to produce lower soot, CO, and CO2 emissions compared to other fuels. Thus, this study provides an overview of the potential of biodiesel as a more environmentally friendly alternative fuel and serves as a basis for evaluating diesel engine performance and emissions in the future."