Fabrikasi Sistem Pengukuran Konduktivitas dan Kapasitas Termal Nanofluida dengan Metode Transient Hot Wire

Gunawan, Muhammad Salsabil Nur (2025) Fabrikasi Sistem Pengukuran Konduktivitas dan Kapasitas Termal Nanofluida dengan Metode Transient Hot Wire. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini melaksanakan fabrikasi dan evaluasi prototipe alat ukur Transient Hot Wire (THW) berbiaya rendah untuk karakterisasi termal nanofluida. Biaya pembuatan prototipe
sebesar Rp 1.240.608 dengan durasi pengukuran 10 detik, lebih murah dan cepat dibandingkan alat komersial. Alat ini menggunakan mikrokontroler ESP32 dan kawat Platinum sebagai sensor. Geometri kawat diuji dengan diameter 20 μm dan 100 μm, serta panjang 3, 5, dan 10 cm. Pengujian dilakukan pada air, etilen glikol, minyak zaitun, dan oli, kemudian dilanjutkan dengan nanofluida Fe dan Fe3O4. Penelitian menemukan geometri kawat memengaruhi akurasi dan ketidakpastian. Konfigurasi terbaik yang diperoleh adalah kawat berdiameter 20 μm dengan panjang 10 cm. Konfigurasi ini memiliki akurasi pengukuran konduktivitas termal sebesar <10% dan ketidakpastian relatif sebesar 1,37%. Kawat 100 μm dengan panjang 3 cm menghasilkan ketidakpastian hingga 5,48% akibat efek radiasi termal dan kesalahan pengukuran resistansi. Prototipe yang di fabrikasi memiliki akurasi 5% untuk fluida air, dengan bias rata-rata 0,005 W/m.K. Resolusi alat ditentukan dengan batas kuantifikasi (LOQ) sebesar 0,007 W/m.K. Keterbatasan alat meliputi rentang temperatur operasi yang sempit (30–40°C) dan kegagalan pengukuran pada konsentrasi nanofluida ≥1% dan tidak dapat mengukur kapasitas termal nanofluida karena interferensi konduktivitas listrik. Metode THW hanya dapat mengukur kapasitas termal air dengan akurasi 1% dan ketidakpastian hingga 24%.
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This study conducts the fabrication and evaluation of a Transient Hot Wire (THW) prototype for the thermal characterization of nanofluids. The prototype was constructed at a cost of IDR 1,240.608, with a measurement duration of 10 seconds, making it more affordable and faster than commercial instruments. The device utilizes an ESP32 microcontroller and a Platinum wire as the sensor. Wire geometry was tested with diameters of 20 μm and 100 μm, and lengths of 3 cm, 5 cm, and 10 cm. Testing was conducted on water, ethylene glycol, olive
oil, and engine oil, followed by Fe and Fe3O4 nanofluids. The study found that wire geometrysignificantly influences accuracy and uncertainty. The optimal configuration was a 20 μm diameter wire with a length of 10 cm, achieving a thermal conductivity measurement accuracy of <10% and a relative uncertainty of 1.37%. In contrast, a 100 μm diameter wire with a 3 cm length resulted in uncertainties of up to 5.48% due to thermal radiation effects and resistance measurement errors. The fabricated prototype demonstrated 5% accuracy for water, with an average bias of 0.005 W/m·K. The instrument's resolution was determined by a limit of quantification (LOQ) of 0.007 W/m·K. Limitations of the device include a narrow operating temperature range (30–40°C) and measurement failures at nanofluid concentrations ≥1%. Additionally, it cannot measure the heat capacity of nanofluids due to electrical conductivity interference. The THW method was only able to measure the heat capacity of water with 1% accuracy and an uncertainty of up to 24%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Fabrication, Measurement, Nanofluid, Thermal Characteristics, Transient Hot Wire. Fabrikasi, Pengukuran, Nanofluida, Karakteristik Termal, Transient Hot Wire
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK351 Electric measurements.
Divisions:	Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Salsabil Nur Gunawan
Date Deposited:	25 Jul 2025 06:19
Last Modified:	25 Jul 2025 06:19
URI:	http://repository.its.ac.id/id/eprint/121790

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