Studi Numerik Pengaruh Penetarting Fin Terhadap Respon Termo Mekanik Pada Reaktor Penyimpanan Hidrogen Berbasis Metal Hydride (LaNi5) - Phase Change Material (LiNO3.3H2O)

Saguna, I Putu Evan Priya (2026) Studi Numerik Pengaruh Penetarting Fin Terhadap Respon Termo Mekanik Pada Reaktor Penyimpanan Hidrogen Berbasis Metal Hydride (LaNi5) - Phase Change Material (LiNO3.3H2O). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Reaktor penyimpanan hidrogen berbasis metal hydride LaNi₅ menghadapi keterbatasan perpindahan panas dan perubahan volume selama proses absorpsi–desorpsi. Penelitian ini menganalisis pengaruh Y-type penetrating fin terhadap performa termal–reaksi dan respons termo-mekanik reaktor LaNi₅–PCM LiNO₃·3H₂O dibandingkan konfigurasi No-Fin. Model tiga dimensi sektor 60° dikembangkan menggunakan ANSYS Fluent dan ANSYS Mechanical dengan pendekatan one-way coupling selama satu siklus 0–8400 s. Parameter yang dianalisis meliputi temperatur, kandungan hidrogen, fraksi reaksi, fraksi cair PCM, deformasi radial, dan hoop stress pada H01 serta H05. Titik acuan mekanik No-Fin diperoleh dari ANSYS Mechanical, sedangkan respons sepanjang siklus dan konfigurasi Y-Fin dievaluasi melalui hubungan yang dikalibrasi terhadap fraksi reaksi dan perbedaan temperatur. Hasil menunjukkan bahwa Y-Fin menurunkan temperatur maksimum MH dari 309,5 K menjadi 307,4 K dan meningkatkan fraksi cair maksimum PCM dari 0,10 menjadi 0,18. Pada 5100 s, hoop stress rata-rata Y-Fin lebih rendah 33,1% pada H01 dan 23,2% pada H05 dibandingkan No-Fin. Pada 6000 s, penurunannya mencapai 27,0% dan 17,6%. Namun, pada akhir absorpsi, hoop stress lokal Y-Fin pada sudut 30° lebih tinggi 4,0% di H01 dan 3,0% di H05. Dengan demikian, Y-Fin meningkatkan perpindahan panas dan menurunkan respons mekanik rata-rata, tetapi menghasilkan distribusi tegangan lokal yang lebih tidak seragam.
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Metal hydride LaNi₅ hydrogen storage reactors are limited by heat-transfer resistance and volume changes during absorption–desorption. This study evaluates the effect of a Y-type penetrating fin on the thermal–reaction performance and thermo-mechanical response of a LaNi₅–LiNO₃·3H₂O PCM reactor relative to a No-Fin configuration. A three-dimensional 60° sector model was developed in ANSYS Fluent and ANSYS Mechanical using one-way coupling over one 0–8400 s cycle. The evaluated parameters included temperature, hydrogen content, reaction fraction, PCM liquid fraction, radial deformation, and hoop stress at H01 and H05. No-Fin Mechanical results were used as calibration points, while the full-cycle response and the Y-Fin configuration were evaluated using a relationship calibrated to reaction fraction and temperature difference. The results show that the Y-Fin reduced the maximum MH temperature from 309.5 K to 307.4 K and increased the maximum PCM liquid fraction from 0.10 to 0.18. At 5100 s, the average Y-Fin hoop stress was 33.1% lower at H01 and 23.2% lower at H05 than that of the No-Fin configuration. At 6000 s, the reductions reached 27.0% and 17.6%, respectively. However, at the end of absorption, the local Y-Fin hoop stress at 30° was 4.0% higher at H01 and 3.0% higher at H05. Therefore, the Y-Fin improved heat transfer and reduced the average mechanical response, but produced a less uniform local stress distribution.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	LaNi₅, metal hydride, PCM, Y-Fin, respons termo-mekanik ============== LaNi₅, metal hydride, PCM, Y-Fin, thermo-mechanical response
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	I Putu Evan Priya Saguna
Date Deposited:	04 Aug 2026 09:45
Last Modified:	04 Aug 2026 09:45
URI:	http://repository.its.ac.id/id/eprint/143565

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