Silicafume/Polyethylene glycol (PEG) composite as a novel form-stable phase change material for thermal energy storage

Abstract

Anahtar kelimeler AbstractThis paper is aimed to prepare, characterize, and determine thermal energy storage properties of silicafume/polyethyleneglycol(PEG) composite as a novel form-stable composite phase change material(PCM). The composite PCM was prepared by incorporating PEG in the silicafume by using vacuum impregnation method. The PEG could be retained by 30 wt% into the silicafume without the leakage of melted PEG from the composite. The composite PCM was characterized by using SEM and FT-IR analysis techniques. Thermal energy storage properties of the composite PCMs were determined by DSC analysis. DSC results showed that the melting temperature and latent heat of the composite PCMs are 27.70 o Cand 87.09 J/g, respectively. Thermal cycling test was conducted to determine the thermal reliability of the composite PCM and the results showed that the composite PCM had good thermal energy storage reliability and chemical stability. TG analysis revealed that the impregnated PEG into the silicafume had good thermal stability. Thermal conductivity of the composite PCM was improved by adding carbon nanotubes (CNTs) in different mass fractions. The effect of CNTs addition on the thermal energy storage/release times of the produced composite PCM was also tested.