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All Journal Motor Bakar : Jurnal Teknik Mesin Akuntansi'45 JPMAT Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Althesa Androva
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Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Transportation Other

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Kaji Eksperimental Efek Kecepatan Sirkulasi Udara Dan Waktu Pembakaran Terhadap Performa Pembakaran Kompor Bio Massa Nur Hasim; Muhamad Safii; Althesa Androva; Suheri Suheri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7321

Abstract

Indonesia is currently facing a significant challenge in managing its growing energy demands, driven by rapid population growth and accelerating economic development. This rising dependency on fossil-based fuels if left unaddressed poses serious environmental and social risks, including pollution, greenhouse gas emissions, and long-term energy insecurity. As a result, biomass has emerged as one of the most promising renewable energy alternatives, particularly for household and community cooking needs. This study investigates the combustion performance of biomass-based biopellets, formulated from a balanced blend of sawdust waste and rice bran, as the primary fuel source. Combustion experiments were carried out inside a purpose-built biomass stove with dimensions of 520 × 250 × 190 mm. To evaluate how airflow intensity and burning duration influence thermal output, three air velocity settings were applied 3 m/s, 6 m/s, and 9 m/s delivered through a controlled blower system. Combustion duration was systematically extended across ten intervals ranging from 60 seconds up to 600 seconds, allowing a detailed characterization of both combustion and thermal efficiency at each stage. Experimental results revealed that the highest thermal efficiency was consistently achieved at an air velocity of 9 m/s combined with a combustion duration of 600 seconds, yielding 46.349% for biopellets and 41.381% for wood. These figures demonstrate a clear positive relationship between increased airflow and prolonged burning time with overall energy conversion performance. The outcomes of this research are intended to serve as a practical engineering reference for designing next-generation biomass stoves that are both energy-efficient and environmentally responsible. Specifically, an air velocity of 9 m/s and a 600-second combustion window are strongly recommended as the benchmark operating parameters for optimal biomass stove performance in real-world applications.
Analisisa Head Losses pada Design Interconnection Pipe Sistem Reverse Osmosis PLTU 2 Labuan dan Keuntungan bagi Perusahaan Hardiman Wahyu Hidayat; Althesa Androva; Muhamad Safi'i
Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipil Vol. 4 No. 3 (2026): Juli: Konstruksi: Publikasi Ilmu Teknik, Perencanaan Tata Ruang dan Teknik Sipi
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/konstruksi.v4i3.1420

Abstract

Water Treatment Plant is a water treatment unit into water that meets the requirements in accordance with the needs of the generating unit. In PLTU Banten 2 Labuan for water treatment plant has two main processes namely seawater pretreatment (purification) and reverse osmosis (purification). Reverse osmosis is a water purification process by providing hydrostatic pressure on the feed water so that it can penetrate permeable membrane cells and produce pure water. Inside the water treatment plant is primarily RO (primary primer RO). Catridge filters are used to filter impurities or particles contained in activated carbon filter water which can damage or block the membrane RO. While HPP Primary RO is used to drain raw water from catridge to primary RO. This Final Project is made based on the findings of field problems when the filter change at catridge A while at the same time pump ready to operate HPP primary RO B due to HPP primary RO A is damaged or is undergoing improvement and vice versa at the time of change of filter at catridge B pump ready to operate HPP primary RO A. Problems caused when the filter change in the catridge cause the production of demin water must be stopped because the reverse osmosis system must stop. For that in this case then I choose the title of Final Project "Designing Interconnection Pipe to add reliability Reverse Osmosis System in PLTU Banten 2 Labuan". With the addition of Interconnection Pipe aims to anticipate the reverse osmosis stop system when the filter change in the catridge and HPP repair RO. This will reduce the financial loss caused by the unit must be daerating (down load).
ANALISIS KEBAIKAN PERPINDAHAN PANAS OIL COOLER PADA POMPA FEEDWATER DI PLTU SUNGAI TENGAR KAPASITAS 4x25MW Sardo Nainggolan; Muhamad Safi’i; Althesa Androva; Yafid Effendi
Motor Bakar : Jurnal Teknik Mesin Vol. 10 No. 1 (2026): Motor Bakar: Jurnal Teknik Mesin
Publisher : Universitas Muhammadiyah Tangerang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31000/mbjtm.v10i1.16591.g%g

Abstract

PLTU berkapasitas 4 × 25 MW yang terintegrasi dengan fasilitas smelter grade alumina di Sungai Tengar, Kalimantan Barat, menggunakan heat exchanger tipe pelat model BR015-4 sebagai oil cooler pada sistem pelumasan feedwater pump (FWP). Peralatan ini berfungsi menjaga temperatur oli pelumas agar tetap berada pada rentang operasi yang aman dan optimal. Penelitian ini bertujuan untuk mengevaluasi performa perpindahan panas heat exchanger, mengidentifikasi faktor-faktor yang memengaruhi efisiensi operasinya, serta menilai kesesuaian kondisi aktual terhadap spesifikasi pabrikan. Data penelitian diperoleh melalui pengamatan selama 48 jam operasi berkelanjutan yang meliputi pengukuran temperatur, tekanan, dan inspeksi kondisi internal alat. Parameter operasi yang digunakan mencakup temperatur maksimum 80°C, temperatur oli masuk 48°C, luas permukaan perpindahan panas 6 m², kecepatan aliran oli sebesar 0,8 m/s pada kondisi normal dan 1,2 m/s saat dua pompa beroperasi, serta kecepatan aliran air pendingin sebesar 1,0 m/s. Hasil perhitungan laju perpindahan panas (Q), beda temperatur rata-rata logaritmik (LMTD), dan koefisien perpindahan panas menyeluruh (U) menunjukkan bahwa pada operasi normal nilai U mencapai 245,2 W/m²·°C, lebih rendah dibandingkan standar industri sebesar 400–800 W/m²·°C. Kondisi tersebut dipengaruhi oleh adanya fouling pada permukaan pelat serta temperatur air pendingin yang melebihi spesifikasi desain. Pada saat dua pompa oli dioperasikan secara bersamaan untuk kebutuhan preventif, nilai U meningkat menjadi 512,5 W/m²·°C dan telah berada dalam rentang standar yang direkomendasikan, dengan tekanan oli masuk tetap berada di bawah batas aman sebesar 0,40 MPa. Hasil penelitian menunjukkan bahwa heat exchanger masih mampu memenuhi kebutuhan operasi feedwater pump, namun peningkatan efisiensi perpindahan panas memerlukan kegiatan pembersihan dan pemeliharaan secara berkala.  
Co-Authors Aan Burhanuddin Aditya Bagas Damara Agus Mukhtar Ahmad Wildanu Dwi Suryo Wicaksono Hardiman Wahyu Hidayat Hisyam Ma’mun Irwan Ardiyatna Lusiana Marita M. Ari Bowo Maulana Abdi Ardiyansyah Muchammad Sulthon Imaddudien Muhammad Ridho AlHafizh Nur Hasim Raditya bayu herlambang Safi'i, Muhamad Sardo Nainggolan Suheri Suheri Syahrul Huda Mauludana Yafid Effendi