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All Journal Turbo : Jurnal Program Studi Teknik Mesin Scientific Journal of Mechanical Engineering Kinematika
Muhammad Irsyad
University of Lampung
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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EXPERIMENTAL STUDY OF PARAFFIN-BASED PCM THERMAL STABILITY AFTER REPEATED THERMAL CYCLES FOR ENERGY STORAGE APPLICATIONS Dondi Kurniawan; Muhammad Irsyad; Apri Wiyono; Ahmad Yonanda; Angga Darma Prabowo; Ardika Kusuma
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.836

Abstract

Paraffin-based phase change materials (PCMs) have great potential in thermal energy storage due to their ability to absorb and release energy during the freezing and melting processes. However, the stability of their thermal characteristics after undergoing repeated heating and cooling cycles remains a challenge for long-term applications. This study aims to evaluate the phase change temperature characteristics and latent heat capacity of paraffin after undergoing 0, 200, 400, and 600 repeated thermal cycles using Differential Scanning Calorimetry (DSC) and T-history tests. The test results show that despite a slight decrease in freezing, melting temperatures changes in chemical structure after a number of cycles, paraffin still maintains its capacity to absorb and release energy quite efficiently. The latent heat capacity decreased from 142.77 J/g to 126.02 J/g over 600 cycles during the melting process. However, during the freezing process, it increased from 139.25 J/g to 147.55 J/g. These findings provide a scientific basis for optimizing paraffin-based PCM for reliable and sustainable thermal energy storage applications.
Evaluasi Termal Heatsink dengan Variasi Arah Aliran pada Sirip Vertikal dan Sirip Bersegmen untuk Pendinginan Pasif Photovoltaic Ahmad Yonanda; Qithfirul Aziz; Amrizal Amrizal; Muhammad Irsyad; Akmad Riszal; Harmen Harmen
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4549

Abstract

Penurunan kinerja modul Photovoltaic (PV) akibat meningkatnya temperatur permukaan masih menjadi tantangan utama yang membatasi efisiensi konversi energi listrik. Salah satu solusi yang potensial adalah menambahkan heatsink pada bagian bawah modul sebagai media pelepas panas. Penelitian ini bertujuan menganalisis sekaligus membandingkan kinerja termal heatsink dengan konfigurasi sirip vertikal dan sirip bersegmen terhadap variasi arah aliran udara. Simulasi numerik dilakukan menggunakan ANSYS Fluent (CFD) melalui beberapa tahapan: perancangan geometri PV dan heatsink, pembuatan mesh, penentuan boundary condition, serta pengujian variasi sudut aliran udara sebesar 0°, 22,5°, 45°, 67,5°, dan 90° dengan kecepatan 2 m/s. Hasil simulasi menunjukkan bahwa heatsink dengan sirip bersegmen mampu menurunkan temperatur maksimum permukaan PV hingga 3 °C (5,6%) dibandingkan sirip vertikal pada sudut aliran 0°. Selain itu, perubahan sudut aliran memberikan pengaruh lebih besar pada sirip vertikal dengan selisih temperatur rata-rata 1,7 °C, sementara pada sirip bersegmen hanya 0,5 °C. Temuan ini menegaskan bahwa konfigurasi sirip bersegmen lebih adaptif terhadap dinamika arah aliran udara, sehingga berpotensi diterapkan pada kondisi nyata dengan karakteristik angin berubah-ubah. Nilai kebaruan (novelty) penelitian ini terletak pada pemodelan numerik yang secara langsung membandingkan kinerja sirip vertikal dan sirip bersegmen terhadap variasi arah aliran — topik yang masih jarang dilaporkan dalam studi pendinginan pasif PV.
Co-Authors Ahmad Yonanda Akmad Riszal Amrizal Amrizal Angga Darma Prabowo Apri Wiyono Ardika Kusuma Dondi Kurniawan Harmen Harmen Qithfirul Aziz