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RE-DESAIN SISTEM PENDINGINAN BIJI KOPI PADA BLOWER COOLANT TRAY MESIN ROASTING KOPI PRATTER PT. PATMANUNGGAL REKA ABADI Nugroho, Yohanes; Nugraha, Aditya; Rozaq, Almas Abdur; Pramudya, Axel Satya
JURNAL KAJIAN TEKNIK MESIN Vol 8, No 2 (2023): Jurnal Kajian Teknik Mesin
Publisher : Universitas 17 Agustus 1945 Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52447/jktm.v8i2.6767

Abstract

AbstrakKualitas kopi ditentukan oleh penangananselama panen dan pasca panen. Biji kopi dihasilkan melalui proses pengupasan, pencucian, pengeringan, dan roasting. Pada proses roasting, pemilihan bloweruntuk pendingin merupakan aspek penting. Masalah yang terjadi pada sistem pendinginan mesin roasting kopi pratter kapasitas 1,5 kg adalah pemilihan blower kurang optimal dikarenakan waktu pendinginan lama. Penelititan tentang blower pada sistem coolant tray bertujuan mengatasi permasalahan tersebut, sehingga cita rasa kopi tidak berubah setelah proses roasting. Mesin roasting memiliki bagian utama yang berfungsi untuk menurunkan suhu panas pada kopi yaitu blower coolant tray. Fokus penelitian terletak pada pembuatan blower yang sesuai dengan perhitungan rumus heat transfer dengan parameter berupa penurunan suhu dari 170° C menjadi 35° C dengan mempertimbangkan hasil kecepatan pendinginan pada blower serta faktor yang dapat meningkatkan daya hisap volume udara. Hasil perhitungan menghasilkan blower dengan dimensi 301 x 358 x 246 mm, panjang ducting pipa 400 mm, dan penggerak motor 2 HP dengan putaran 3000 rpm. Hasil simulasi software solidwork menggunakan fitur CFD (Computational Fluid Dynamics) didapatkan tingkat kecepatan hisap sebesar 2,359 m/s dan daya hisap volume sebesar 0,000115m3/s.Kata Kunci: Blower, heat transfer, CFD, roasting.AbstractCoffee quality is determined by handling during harvest and post-harvest.Coffee beans are produced through the process of peeling, washing, drying and roasting.In the roasting process, the selection of blowers for cooling is an important aspect.The problem that occurs in the cooling system for a pratter coffee roasting machine with a capacity of 1.5 kg is that the selection of the blower is not optimal due to the long cooling time.Research on blowers on coolant tray systems aims to overcome these problems, so that the taste of coffee does not change after the roasting process.The roasting machine has the main part that functions to reduce the heat temperature of the coffee, namely the blower coolant tray.The focus of the research lies in making a blower according to the calculation of the heat transfer formula with parameters in the form of a temperature drop from 170° C to 35° C by considering the results of the cooling speed of the blower and factors that can increase the suction power of the air volume.The calculation results produce a blower with dimensions of 301 x 358 x 246 mm, a ducting pipe length of 400 mm, and a 2 HP motor drive with 3000 rpm rotation.Solidwork software simulation results using the CFD (Computational Fluid Dynamics) feature obtained a suction speed level of 2.359 m/s and a volume suction power of 0.000115 m3/s.Keywords: Blowers, heat transfer, CFD, roasting 
Improving the Bending Quality of SUS 201 1B Material by Optimization of the Processing Parameters Using Taguchi Method Pramudya, Axel Satya; Nugraha, Aditya
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 8 No. 2 (2024): Desember
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i2.23439

Abstract

Sheet metal bending was a type of sheet metal forming process that produced sheet metal bending according to a certain angle and length using a die. The formed process caused elastic and plastic deformation, resulting in springback and sheet metal elongation. The research analysed used the Taguchi method to find the best arrangement of bending parameters that produced the best bending angle and side length. The bending parameters selected in the study were material cutting orientation factor, punched velocity, and held timed. The ANOVA method would follow the tested results to determine the contribution of each parameter tested. The results stated that the material cutting orientation 0-degree, punched velocity of 10 mm/s, and held time of 5 seconds was the best parameter arrangement that produced the best bending angle with the smallest spring-backed angle. The bending parameter arrangement for the best-bending side length was a material cutting orientation of 0 degrees, pressing speed of 15 mm/s, and holding time of 5 sec. The studied results concluded that the material cutting orientation factor had the largest contribution to the angle and length of the bending side, with a percentage contribution of 98.105% and 98.499%.