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All Journal Turbo : Jurnal Program Studi Teknik Mesin G-Tech : Jurnal Teknologi Terapan
Putra, Mohammad Alexin
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Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering Mechanical Engineering

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Comparing the Effect of Using DC Fans and Heatsinks As Cooling Systems on Photovoltaic Efficiency Hakim, Muhammad Fuad Abdul; Putra, Mohammad Alexin; Nurhilal, Otong
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2947

Abstract

One of the utilizations of solar energy is to be converted into electricity using photovoltaics (PV). The most important performance parameter of PV is efficiency. The efficiency will decrease as the PV temperature increases. Therefore, a cooling system is needed to increase PV efficiency. The objective of the research is to determine and compare the effect of DC fan and heatsink as a cooling system on PV efficiency. Four PV units with a capacity of 30 WP are used. The experiment is conducted as follows, the first PV is equipped with DC fan cooling, the second PV with heatsink cooling, the third PV with a combination of DC fan and heatsink cooling, and the fourth PV is without cooling as a reference. The result shows, that the combination of DC fan and heatsink cooling system provides the highest efficiency improvement, namely 32.08%, followed by DC fan cooling, namely 16.04%. As for heatsink cooling, there is no improvement in efficiency. The combination of DC fan and heatsink cooling system can dissipate heat from the PV more effectively than DC fan cooling system, so the PV temperature is lower and produces higher output power and efficiency. The heatsink cooling system is not effective in dissipating heat because of limited natural airflow due to the low PV stand which is only 30 cm from the ground.
Dimensional Consistency Analysis in High Speed 3D Printing Ramadhan, Doni Fajar; Sodiq, Fajar; Saputra, Hendri Maja; Putra, Mohammad Alexin
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i1.3795

Abstract

3D printing technology has been widely applied in various industries, including manufacturing, healthcare, automotive, aerospace, and others. High 3D printing speeds, such as 1200 mm/s, offer the potential to significantly accelerate the production process. However, increasing this speed also presents challenges related to the quality and dimensional consistency of the printed parts. Therefore, understanding how each parameter interacts and affects the printing results is key to optimizing high-speed 3D printing processes. This research focuses on the dimensional accuracy of 3D printed objects. The method used involves printing 5 cube samples measuring 20mm x 20mm x20 mm with a 10 mm through all hole using Acrylonitrile Butadiene Styrene (ABS) Highspeed and  Polylactic Acid (PLA) Highspeed materials at a maximum print speed of 1200 mm/s. After the printing process, the dimensions of each sample are carefully measured using a vernier caliper at three different points.  PLA material tends to have a larger deviation than ABS, especially in the circle diameter parameter with a deviation percentage of 5.88%, while ABS is 5.02%. Based on the results overall the deviation of length, width, height, and hole diameter dimensions in both materials is not significant for general applications, but the deviation in hole diameter shows a higher value than other dimensions.
Analisis Efisiensi dengan Pengurangan Downtime dalam Proses Produksi Gravity Casting pamungkas, satriyo Murti; Putra, Mohammad Alexin
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 1 (2025): TURBO : Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i1.3997

Abstract

Penelitian ini bertujuan untuk mengoptimalkan desain cetakan (mold) dalam proses gravity casting guna meningkatkan efisiensi produksi dan kualitas hasil casting. Proses casting awal menghadapi beberapa masalah, termasuk distribusi suhu cetakan yang tidak merata, tingginya tingkat kecacatan produk (Casting NG Ratio), dan waktu siklus produksi yang kurang efisien akibat lamanya proses bakar mold. Untuk menganalisis isu-isu ini, dilakukan simulasi menggunakan perangkat Computer Aided Engineering (CAE), khususnya Computational Fluid Dynamics (CFD), untuk memodelkan distribusi suhu, pola aliran logam cair, dan transfer panas pada desain cetakan yang digunakan. Hasil simulasi menunjukkan bahwa desain awal cetakan memiliki kelemahan signifikan, terutama dalam distribusi suhu yang tidak merata, yang menyebabkan cacat seperti porositas, retak, dan penyusutan tidak seragam. Faktor-faktor yang memengaruhi permasalahan ini meliputi desain geometris cetakan, material cetakan, suhu tuang, dan laju pendinginan. Berdasarkan temuan ini, penelitian melanjutkan dengan pengembangan desain cetakan yang lebih baik, termasuk perbaikan geometri cetakan untuk mendukung aliran logam cair yang lebih merata, pemilihan material cetakan dengan sifat termal yang lebih baik, serta penambahan fitur pendukung seperti saluran pendingin dan pengatur aliran logam cair. Desain yang dioptimalkan kemudian diuji melalui simulasi lanjutan, yang menunjukkan peningkatan pencapaian produksi dari 57,28% menjadi 97,54%. Selain itu, waktu henti proses bakar mold berkurang dari 1350 menit menjadi 180 menit, mencerminkan peningkatan efisiensi yang signifikan. Tingkat kecacatan produk juga menurun dari 40,94% menjadi 21,15%. Dengan demikian, penelitian ini membuktikan bahwa optimasi desain cetakan melalui simulasi dan eksperimen dapat menghasilkan cetakan yang lebih efektif dan efisien. Hasil tersebut memberikan solusi terhadap masalah dalam proses casting sebelumnya dan berkontribusi pada peningkatan produktivitas serta kualitas hasil produksi pada skala industri, dengan rekomendasi untuk implementasi desain cetakan yang telah dioptimalkan dalam proses manufaktur yang lebih luas.
Redesign of the Aeration Centrifugal Fan Impeller in a Steam Power Plant to Reduce Vibration Issues Almadi, Dadang; Putra, Mohammad Alexin; Hakim, Muhammad Fuad Abdul
G-Tech: Jurnal Teknologi Terapan Vol 9 No 2 (2025): G-Tech, Vol. 9 No. 2 April 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i2.6792

Abstract

The aeration centrifugal fan (ACF) functions to inject pressurized air into the aeration pond containing wastewater from power plant operations. This increases the water's oxygen content before discharge. However, as a rotating device, the ACF often faces high vibration issues, including at a steam power plant in Cilacap Regency. Vibration in this unit exceeded permissible limits. Analysis identified blade pass and surging, linked to the impeller design, as the cause. This indicates the existing impeller was not suited to actual operational conditions. This study aims to redesign the impeller to reduce vibration. The redesign involved increasing the number and width of blades, followed by CFD simulations and vibration testing. Results showed volumetric flow rate and pressure increased from 50,887.1 m³/s to 61,185 m³/s and from 226.9 kPa to 696.3 kPa. Vibration dropped from 19.96 mm/s to 2.916 mm/s (below the 7.1 mm/s limit). Thus, the redesign successfully reduced excessive vibration.
Co-Authors Almadi, Dadang Fajar Sodiq, Fajar Hakim, Muhammad Fuad Abdul Hendri Maja Saputra Otong Nurhilal pamungkas, satriyo Murti Ramadhan, Doni Fajar