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All Journal JURNAL TEKNIK IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Althesa Androva
Universitas Persatuan Guru Republik Indonesia Semarang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS KEBAIKAN PERPINDAHAN PANAS OIL COOLER PADA POMPA FEEDWATER DI PLTU SUNGAI TENGAR KAPASITAS 4x25MW Sardo Hita Nainggolan; Muhamad Safi’i; Althesa Androva; Yafid Effendi
Jurnal Teknik Vol. 15 No. 2 (2026): Juli - Desember 2026
Publisher : Universitas Muhammadiyah Tangerang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31000/w0bgds49

Abstract

PLTU kapasitas 4 x 25 MW yang terintegrasi dengan plant smelter grade alumina di Sungai Tengar, Provinsi Kalimantan Barat, menggunakan heat exchanger tipe plat (oil cooler) model BR015-4 untuk menjaga suhu oli pelumas pompa feedwater pump (FWP) dalam rentang optimal. Penelitian ini bertujuan untuk menganalisis kinerja perpindahan panas pada heat exchanger tersebut, mengidentifikasi faktor-faktor yang memengaruhi efisiensi operasinya, serta memverifikasi kesesuaian operasi dengan spesifikasi pabrikan. Pengumpulan data dilakukan selama 48 jam operasi kontinu dengan pengukuran parameter suhu, tekanan, dan pemeriksaan kondisi internal alat. Spesifikasi yang digunakan dalam penelitian ini meliputi suhu maksimal operasi 80°C, suhu oli masuk 48°C, luas permukaan perpindahan panas 6 m², laju aliran oli 0,8 m/s pada operasi normal (1 pompa aktif) dan 1,2 m/s pada operasi preventif (2 pompa aktif), serta laju aliran air 1,0 m/s. Perhitungan laju perpindahan panas (Q), selisih suhu logaritmik (LMTD), dan koefisien perpindahan panas keseluruhan (U) menunjukkan bahwa pada operasi normal (1 pompa oli aktif), nilai U=245,2 W/m²⋅°C berada di bawah standar industri (400–800 W/m²⋅°C) akibat fouling dan suhu air pendingin yang melebihi spesifikasi. Pada operasi 2 pompa oli aktif selama proses preventif perpindahan pompa oli, nilai U meningkat menjadi 512,5 W/m²⋅°C (masuk dalam rentang standar) dengan tekanan oli inlet sesuai batas aman 0,40 MPa. Hasil penelitian menunjukkan bahwa heat exchanger mampu memenuhi kebutuhan operasional pompa feedwater, namun perlu dilakukan pembersihan berkala dan pemeliharaan untuk meningkatkan efisiensi perpindahan panas lebih lanjut.
Desain Logika Fuzzy untuk Penilaian Kualitas Air Sumur Berdasarkan Parameter Salinitas, pH, dan Kekeruhan Aan Burhanuddin; Agus Mukhtar; Rifki Hermana; Muhammad Amirudin; Muchamad Malik; Althesa Androva; Hisyam Ma’mun; Mohammad Fadillah; Ezze Zhain Zhiqqi Prihantono; Subkhan Ma'mum
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.333

Abstract

This study develops an integrated fuzzy-logic-based assessment system to evaluate well water quality using pH, salinity (via TDS conversion), and turbidity. The research aims to develop an adaptive system capable of handling uncertainties in water quality parameters in real-time monitoring across Semarang's coastal areas. The methodology incorporates sensor performance validation, fuzzy input processing, rule-based inference, and defuzzification implemented through MATLAB R2021a. Experimental results demonstrate exceptional metrological performance, with sensor linearity achieving determination coefficients (R²) of 0.9995 for pH, 0.9998 for salinity, 0.9996 for temperature, and 0.9993 for turbidity. Statistical validation confirmed measurement precision, with root-mean-square errors (RMSEs) of 0.018 pH units, 0.023 ppt salinity, 0.14°C temperature, and 0.027 NTU turbidity. Field implementation across 6 sub-districts revealed that 83.3% of samples complied with pH quality standards, 60% met turbidity thresholds, while 33.3% of samples in Genuksari exhibited seawater intrusion indicators with salinity levels exceeding 0.5 ppt. The study conclusively demonstrates that the developed fuzzy logic system provides accurate, consistent water quality evaluation and presents a viable framework for smart water monitoring infrastructure in coastal urban environments, particularly for detecting saline intrusion and maintaining water security.
Co-Authors Aan Burhanuddin Agus Mukhtar Ezze Zhain Zhiqqi Prihantono Hisyam Ma’mun Mohammad Fadillah Muchamad Malik Muhammad Amirudin Rifki Hermana Safi'i, Muhamad Sardo Hita Nainggolan Subkhan Ma'mum Yafid Effendi