Muhidin, Rizqi Zaidan (2026) Simulasi Numerik dan Validasi Eksperimental Sistem Latent Thermal Energy Storage Berbasis Phase Change Material Paraffin-Graphite pada Finned-Tube Heat Exchanger. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Latent Thermal Energy Storage (LTES) berbasis Phase Change Material (PCM) menawarkan densitas energi tinggi untuk aplikasi penyimpanan energi termal, namun kinerjanya dibatasi oleh konduktivitas termal PCM parafinik yang rendah. Penelitian ini bertujuan untuk mengembangkan dan memvalidasi model simulasi numerik sistem LTES dengan konfigurasi finned-tube heat exchanger menggunakan ANSYS Fluent, serta menganalisis pengaruh penambahan filler konduktif berupa graphite powder terhadap kinerja proses charging. Model numerik disusun menggunakan pendekatan enthalpy–porosity dan divalidasi terhadap data eksperimen acuan pada kondisi operasi laju alir fluida pemindah panas 25 kg/jam dan temperatur inlet 70 °C, dengan indikator utama berupa profil temperatur outlet fluida terhadap waktu. Hasil validasi menunjukkan kesesuaian yang baik antara simulasi dan eksperimen, dengan nilai Root Mean Square Error (RMSE) sebesar 4,204 °C. Studi parametrik selanjutnya dilakukan dengan membandingkan PCM parafin murni dan PCM parafin dengan penambahan graphite powder sebesar 5%, 10%, dan 15% (vol.). Hasil simulasi menunjukkan bahwa penambahan filler konduktif mempercepat waktu charging, meningkatkan laju perpindahan panas, dan menghasilkan respons temperatur outlet yang lebih cepat. Secara keseluruhan, fraksi graphite powder 5% (vol.) memberikan kinerja paling optimal dengan penurunan waktu charging yang signifikan dan penalti kapasitas energi laten yang minimal. Fraksi yang lebih tinggi memberikan respons termal lebih cepat namun mengurangi kapasitas penyimpanan energi. Temuan ini menegaskan pentingnya optimasi material PCM sebagai pelengkap desain heat exchanger untuk meningkatkan kinerja sistem LTES pada aplikasi dengan durasi pemanasan terbatas.
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Latent Thermal Energy Storage (LTES) systems based on Phase Change Materials (PCM) provide high energy density for thermal energy storage applications, yet their performance is limited by the low thermal conductivity of paraffin-based PCM. This study aims to develop and validate a numerical simulation model of a finned-tube heat exchanger LTES system using ANSYS Fluent, and to investigate the effect of conductive filler addition in the form of graphite powder on charging performance. The numerical model is formulated using the enthalpy–porosity approach and validated against experimental reference data under operating conditions of a heat transfer fluid mass flow rate of 25 kg/h and an inlet temperature of 70 °C, using the outlet temperature profile as the primary validation indicator. Validation results show good agreement between simulation and experimental data, with a Root Mean Square Error (RMSE) of 4.204 °C. A parametric study is then conducted by comparing pure paraffin PCM with paraffin-based PCM containing 5%, 10%, and 15% (vol.) graphite powder. The results indicate that the addition of conductive filler significantly accelerates the charging process, enhances heat transfer rates, and produces a faster outlet temperature response. Overall, the PCM with 5% (vol.) graphite powder exhibits the most optimal performance, achieving a substantial reduction in charging time with minimal latent energy storage penalty. Higher filler fractions provide faster thermal response but reduce energy storage capacity. These findings highlight the importance of PCM material optimization as a complement to heat exchanger design for improving LTES performance in applications with limited heating duration.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Latent Thermal Energy Storage, Phase Change Material, Finned-Tube Heat Exchanger, Graphite Powder, Charging Process. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage. T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Rizqi Zaidan Muhidin |
| Date Deposited: | 03 Feb 2026 09:59 |
| Last Modified: | 03 Feb 2026 09:59 |
| URI: | http://repository.its.ac.id/id/eprint/131883 |
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