DEVELOPMENT OF MICROENCAPSULATED N-OCTADECANE/NANOCLAY COMPOSITE PHASE CHANGE MATERIALS FOR THERMAL ENERGY STORAGE APPLICATIONS

Year 2020, Volume: 9 Issue: 1, 675 - 687, 30.01.2020

Hatice Hande Mert , Sena Bayram

https://doi.org/10.28948/ngumuh.552533

Abstract

Phase change materials (FDMs) are materials that allow thermal energy to be stored as a latent heat and can be used in a wide
range of thermal energy storage applications owing to its high latent heat storage capacities. The paraffins in the organic class
of FDMs are come into prominence by their high latent heat storage capacities, thermal and chemical stability. However, the
direct use of these materials in the storage of thermal energy is not suitable because of its potential risk to leakage in liquid
phase. Therefore, the macro / micro scale encapsulation process to be applied to these materials is one of the suitable solution
ways. It is also possible that adding various inorganic porous fillers as a support material during the encapsulation process to
increase the structural, chemical and thermal stability of these materials. In this study, n-octadecane (OD), one of the FDMs,
was encapsulated in micro-size by phase inversion emulsification in the presence of surface modified montmorillonite clay
contained 15-35 wt% octadecylamine and 0.5-5 wt% aminopropyltriethoxysilane. The usage potential of microcapsules in
latent heat storage applications at low temperature (20-35 ° C) with owing to phase change temperature range, thermal energy
storage capacities and thermal stabilities were investigated. 

Keywords

Composite phase change materials, N-octadecane, Thermal energy storage, Encapsulation

ISIL ENERJİ DEPOLAMA UYGULAMALARINA YÖNELİK MİKROKAPSÜLLENMİŞ N-OKTADEKAN/NANOKİL KOMPOZİT FAZ DEĞİŞTİREN MALZEMELERİN GELİŞTİRİLMESİ

Abstract

Faz
değiştiren maddeler (FDMler), ısıl enerjinin gizli ısı olarak depolanabilmesine
olanak tanıyan ve yüksek gizli ısı depolama kapasiteleriyle oldukça geniş bir
yelpazedeki ısıl enerji depolama uygulamalarında kullanılabilen malzemelerdir. FDMlerin
organik sınıfında yer alan parafinler, yüksek gizli ısı depolama kapasiteleri,
ısıl ve kimyasal kararlılıklarıyla ön plana çıkmaktadır. Bununla beraber bu
malzemelerin ısıl enerji depolamada doğrudan kullanımı, sıvı faz halinde sızdırma
potansiyeli nedeniyle uygun değildir. Dolayısıyla bu malzemelere uygulanacak
makro/mikro ölçekli kapsülasyon işlemi uygun çözüm yollarından biridir. Ayrıca bu
malzemelerin yapısal, kimyasal ve ısıl kararlılıklarının arttırılması amacıyla
çeşitli inorganik gözenekli dolguların kapsülasyon işlemi esnasında destek
malzeme olarak ilavesi de mümkün olmaktadır. Bu çalışmada, FDMlerden biri olan
n-oktadekan (OD) ağırlıkça %15-35 oktadesilamin ve %0,5-5
aminopropiltrietoksisilan ile yüzeyi modifiye edilmiş montmorillonit kili
varlığında faz inversiyon emülsifikasyonu yöntemiyle mikro boyutta
kapsüllenmiştir. Hazırlanan mikrokapsüllerin faz değişim sıcaklık aralığı, ısıl
enerji depolama kapasiteleri ve ısıl kararlılıklarıyla düşük sıcaklıktaki
(20-35°C) gizli ısı depolama uygulamalarında kullanılabilme potansiyelleri araştırılmıştır.

Keywords

Kompozit faz değiştiren maddeler, n-oktadekan, ısıl enerji depolama, kapsülasyon

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