Effect of Nanoparticle Type on the Melting Performance of Paraffin-Based Phase Change Materials: A Numerical Study

Öz

This study numerically investigated the melting behavior of pure paraffin (RT58) and nanoparticle-enhanced phase change materials (PCMs) containing 4 vol.% GNP, 4 vol.% NiFe2O4, and a hybrid mixture consisting of 2 vol.% graphene (GNP) and 2 vol.% nickel ferrite (NiFe2O4). GNP, which has been widely recognized for its superior heat transfer characteristics, was selected as a benchmark additive, whereas NiFe2O4 was investigated as a potential alternative nanoparticle for enhancing the thermal performance of latent heat storage systems.Two-dimensional transient simulations were performed using the enthalpy-porosity method implemented in ANSYS Fluent 18.2. The influence of wall temperature and nanoparticle type on melting characteristics was analyzed. Increasing the wall temperature from 360 K to 370 K reduced the melting time of pure paraffin by 65.7%. Based on these results, a wall temperature of 365 K was selected as the reference condition for nanoparticle comparisons. Relative to pure paraffin, the melting time decreased by 38.1%, 48.6%, and 63.8% for GNP-, hybrid-, and NiFe2O4-enhanced PCMs, respectively. Furthermore, the hybrid PCM outperformed the GNP-enhanced PCM by 16.9%, whereas the NiFe2O4-enhanced PCM provided a 41.5% shorter melting duration than the GNP-enhanced PCM. 

Anahtar Kelimeler

• Latent heat storage
• phase change material
• graphene
• nickel ferrite

Destekleyen Kurum

Gazi University Scientific Research Projects Coordination Unit

Proje Numarası

FDK-2023-7974

Etik Beyan

The authors of this article declare that the materials and methods used in this study do not require ethical committee permission and/or legal-special permission.

Parafin Esaslı Faz Değişim Malzemelerinin Erime Performansı Üzerinde Nanoparçacık Türünün Etkisi: Sayısal Çalışma

Öz

Bu çalışmada, saf parafin (RT58) ile hacimce %4 grafen (GNP), hacimce %4 nikel demir oksit (NiFe2O4) ve hacimce %2 GNP + %2 NiFe2O4 içeren hibrit nano-katkılı faz değiştiren malzemelerin (FDM) erime davranışı sayısal olarak incelenmiştir. Üstün ısı transfer özellikleri nedeniyle literatürde yaygın olarak kullanılan GNP referans nanoparçacık olarak seçilmiş, NiFe2O4 ise gizli ısı depolama sistemlerinin termal performansını artırmaya yönelik alternatif bir nanoparçacık olarak değerlendirilmiştir. İki boyutlu zamana bağlı analizler, ANSYS Fluent 18.2 yazılımında entalpi-gözeneklilik yöntemi kullanılarak gerçekleştirilmiştir. Duvar sıcaklığı ve nanoparçacık türünün erime karakteristikleri üzerindeki etkileri incelenmiştir. Duvar sıcaklığının 360 K'den 370 K'ye yükseltilmesi, saf parafinin toplam erime süresini %65.7 oranında azaltmıştır. Nanoparçacıkların karşılaştırılması için referans durum olarak 365 K duvar sıcaklığı seçilmiştir. Saf parafine kıyasla, erime süresi GNP, hibrit ve NiFe2O4 katkılı FDM'lerde sırasıyla %38.1, %48.6 ve %63.8 oranlarında azalmıştır. Ayrıca hibrit FDM, GNP katkılı FDM'ye göre %16.9 daha iyi performans gösterirken, NiFe2O4 katkılı FDM'nin erime süresi GNP katkılı FDM'ye göre %41.5 daha kısa bulunmuştur.

Anahtar Kelimeler

• Gizli ısı depolama
• faz değişim malzemesi
• grafen
• nikel ferrit

Proje Numarası

FDK-2023-7974

Kaynakça

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