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All Journal Jurnal Teknik ITS Majalah Ilmiah MOMENTUM Innovative: Journal Of Social Science Research Majalah Teknik Mesin
Apriadi, Hairun
Politeknik Industri Logam Morowali
Humanities Automotive Engineering Computer Science & IT Education Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Public Health Other

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Studi Eksperimen Pengaruh Viskositas Pelumas Terhadap Performansi Compressor Refrigeration Hairun Apriadi Ramadhan; Ary Bachtiar Krishna Putra
Jurnal Teknik ITS Vol 7, No 1 (2018)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (802.548 KB) | DOI: 10.12962/j23373539.v7i1.27531

Abstract

Minyak pelumas atau oli kompresor pada sistem AC berguna untuk melumasi bagian-bagian kompresor agar tidak cepat aus karena gesekan. Selain untuk mengurangi dan memperkecil gesekan dan keausan diantara permukaan-permukaan mesin yang bergerak, pelumas juga berperan untuk menyerap panas yang timbul karena gesekan antara komponen-komponen mesin, hal ini membuat komponen mesin terhindar dari overheating atau panas berlebih. Akan tetapi ada kemungkinan performansi kompresor dapat bekerja dengan baik dengan oli kompresor yang memiliki viskositas yang stabil. Alat dan bahan yang digunakan dalam penelitian ini antara lain AC split, refrigeran jenis terhidrogenasi chlrofluokarbon, pelumas jenis mineral oil. AC split yang tersusun dari sebuah indoor unit dan outdoor unit dirangkai dengan TXV (thermostatic expansion valve), inverter, serta alat ukur berupa flowmeter, termokopel, dan pressure gauge. Pengambilan data dilakukan dengan menggunakan variasi putaran evaporator fan (low, medium, high), pengguanaan oli seri 3GS, 4GS dan 5GS. Pada setiap variasi, pengambilan data dilakukan selama 1 jam dengan interval 5 menit. Hasil yang didapatkan dari studi eksperimen pengaruh viskositas pelumas terhadap performansi compressor refrigeration, dengan penggunaan viskositas 100cSt(5GS) efisiensi kompresor yang dihasilkan pada beban high mencapai 73.6% dan nilai tesebut lebih besar jika dibandingkan dengan kedua viskositas 55cSt(4GS) dan 30cSt(3GS), yaitu 72.1% dan 70.3% pada pada kondisi beban high. Penggunaan viskositas yang lebih tinggi, menghasilkan efisiensi kompresor yang lebih besar sehingga mempengaruhi kerja kompresor.
Studi Termodinamika Pengaruh Hidden Capacity Pada Pembangkit Listrik Tenaga Uap dengan Permodelan GateCyle Mahmuddin, Mahmuddin; Apriadi, Hairun; Habiba, Syahrir
Innovative: Journal Of Social Science Research Vol. 4 No. 2 (2024): Innovative: Journal Of Social Science Research
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/innovative.v4i2.9951

Abstract

Kebutuhan pasokan listrik di setiap tahunnya mengalami kenaikan, sedangkan batubara sebagai bahan bakar utama PLTU mengalami kenaikan harga dan tingginya permintaan ekspor dari luar menyebabkan batubara di indonesia harus menggunakan batubara dengan jenis kualitas rendah. Dengan memperhatikan segi faktor bahan bakar dan parameter operasi pada kinerja boiler agar efisien menggunakan metode ASME PTC 4. Langkah-langkah yang digunakan dalam penelitian ini, diawali dengan pengambilan data PLTU. Metode analisa unjuk kerja pembangkit dilakukan dengan analisa termodinamika dan menjalankan software pembangkit ,yaitu gatecyle untuk mengetahui hidden capacitysuatu pembangkit. Data yang di gunakan disesuaikan dengan kondisi operasi dan data desain di PLTU Barru Unit 2. Variasi yang dipakai pada metode ini adalah variasi batubara terhadap pembebanan sebelum overhaul dan setelah overhaul. Hasil dari analisa Simulasi GateCycle yang telah dilakukan pada saat sebelum overhaul dan setalah overhaul pada pembebanan pembangkit sebesar 100% didapatkan heat loss pada efisiensi turbin sebesar 5,95%. Dengan analisa secara termodinamika didapatkan flowrate bahan bakar yang diumpankan ke dalam boiler terjadi perbedaan sebesar 17,08%, Heat Rate yang dihasilkan mengalami penurunan sebesar 3,84% yang identik dengan peningkatan effisiensi pembangkit sebesar 6%, Effisiensi Boiler yang didapatkan pun meningkat sebesar 0,4%.
DESIGN AND SAFETY FACTOR SIMULATION OF AN AUTOMATED FEEDER FOR BLANKING MACHINES Usman; Wijayanto, Hendi Lilih; Zulfianti; Yusdianto; S, Hairun Apriadi Ramadhan; Usman
Media Mesin: Majalah Teknik Mesin Vol. 26 No. 2 (2025)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v26i2.6977

Abstract

The displacement of the stainless-steel plate to the printing work area is still managed manually by theoperator. Additionally, there is no clear benchmark to determine whether the plate is in the correct position andaligned according to the printed pattern. Thus, the print results are frequently less than perfect and require a longprocess. To address these conditions, an additional feeder is required with an automatic system that can operatein conjunction with the blanking machine, simplifying the operator's work and enhancing the blanking processefficiency. The objectives of this research are to determine the design of the feeder machine design by the needsand specifications of the machine, to discover the value of the safety factor of the Feeder machine design, and toreveal the movement system of the Feeder machine design using SolidWork 2019. This final project was carriedout in June 2023 at Politeknik Industri Logam Morowali (PILM) in Labota Village, Bahodopi District, MorowaliRegency, Central Sulawesi Province. The results show that: Researchers can make a design with the provisionsof a length of 550 mm and a width of 250 mm, while the known safety factor value for both areas is declared safesince it has Factor of Safety (FOS) value of 1 and the design movement system displayed on the animation systemin SolidWork 2019 software.
EVALUASI DINAMIKA TITIK BERAT KURSI RODA PADA KEMIRINGAN JALAN 20° BERDASARKAN SIMULASI DAN PERHITUNGAN ANALITIS Usman; Faisal Habib; Hairun Apriadi Ramadhan; Angga Tegar Setiawan
JURNAL ILMIAH MOMENTUM Vol 21 No 2 (2025): Oktober 2025
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/mim.v21i2.14195

Abstract

According to data from Indonesia’s Central Statistics Agency (BPS) and the Ministry of Social Affairs [1,2], over 5.3 million individuals with physical disabilities face mobility challenges, particularly when using wheelchairs on sloped terrain. A major issue is the instability of manual wheelchairs on steep inclines, which increases the risk of tipping and requires assistance. This study aims to evaluate the dynamics of center of gravity (COG) shifts in wheelchairs on road slopes up to 20°, using simulation and analytical calculation methods. The methodology includes literature review, wheelchair type surveys, slope condition observations, and system kinematics and force analysis. Results show that the COG remains within a safe zone during slope transitions, with reaction force distribution remaining stable between 87.63 and 93.26 kg. Pressure on the front and rear wheels remains within safety limits, avoiding deformation or loss of traction. The highest power consumption recorded was 144.56 watts during ascent, which significantly decreased on flat or descending terrain. The findings suggest that the proposed wheelchair design is adaptive, safe, and energy-efficient, making it suitable for users with disabilities navigating urban environments with varied topography.
ANALISIS KINERJA PLTU BARRU POMU UNIT 2: EVALUASI NET PLANT HEAT RATE DAN SPECIFIC FUEL CONSUMPTION PADA BERBAGAI VARIASI BEBAN Hairun Apriadi Ramadhan S; Nasrun Nasrun
JURNAL ILMIAH MOMENTUM Vol 21 No 2 (2025): Oktober 2025
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/mim.v21i2.14569

Abstract

This research aims to evaluate the performance of the Barru POMU Steam Power Plant (PLTU) Unit 2 through testing of Net Plant Heat Rate (NPHR), Specific Fuel Consumption (SFC), and Net Capability (Daya Mampu Netto - DMN). The tests were conducted at four variations of operating load, namely 75%, 85%, 92%, and 100%, using the input-output method and the heat loss method in accordance with the ASME PTC 4 standard. The test results show a Net Capability (DMN) of 44.64 MW. The lowest NPHR value was obtained at 100% load, which was 3,794.04 kcal/kWh with a Net SFC of 0.96 kg/kWh, while the highest NPHR was at 75% load, which was 4,166.23 kcal/kWh with a Net SFC of 1.02 kg/kWh. Boiler efficiency using the heat loss method ranged from 81.60% to 83.02%, increasing with the increase in load. The analysis indicates that operation at full load provides optimal efficiency with the lowest specific fuel consumption. This research provides baseline data for operational optimization and power purchase agreements in the context of PLN's generation consolidation into the Subholding Generation Company.
Co-Authors Angga Tegar Setiawan Ary Bachtiar Krishna Putra Faisal Habib Habiba, Syahrir Hendi Lilih Wijayanto Mahmuddin Mahmuddin Nasrun Nasrun Usman Usman Yusdianto Zulfianti