Investigation of thermal energy storage properties of a microencapsulated phase change material using response surface experimental design methodology

2020

Int J Energy Res

Self Cite

Summary A novel shape‐stabilized n‐hexadecane/polyHIPE composite phase change material (PCM) was designed and thermal energy storage properties were determined. Porous carbon‐based frameworks were produced by polymerization of styrene‐based high internal phase emulsions (HIPEs) in existence of the surface modified montmorillonite nanoclay. The morphological and mechanical properties of the obtained polyHIPEs were investigated by scanning electron microscopy analysis and the compression test, respectively. The polyHIPE composite with the best pore morphology and the highest compression modulus was determined as a framework to prepare the form stable n‐hexadecane/polyHIPE composite phase change material using the one‐step impregnation method. The chemical structure and morphologic property of composite PCM was investigated by FT‐IR and polarized optical microscopy analysis. Thermal stability of the form‐stable PCM (FSPCM) was examined by TG analysis. The n‐hexadecane fraction engaged into the carbon foam skeleton was found of as 55 wt% from TG curve. differential scanning calorimetry analysis was used for determining melting temperature and latent heat storage capacity of FSPCM and these values were determined as (26.36°C) and (143.41 J/g), respectively. The results indicated that the obtained composite material (FSPCM) has a considerable potential for low temperature (18°C‐30°C) thermal energy storage applications with its thermal energy storage capacity, appropriate phase change temperatures and high thermal stability.

Section: Thermal Properties and Latent Heat Storage Capacities Of Polyhipe Compositebased Fspcmmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

PolyHIPE composite based‐form stable phase change material for thermal energy storage

2020

Int J Energy Res

Self Cite

“…In another study, the properties of a capric acid–oleic acid–HD mixture with a styrene (St)–divinyl benzene (DVB) copolymer shell as a PCM were investigated with a central composite face‐centered experimental design method. The analysis results prove that the optimal PCM had a relatively higher latent heat of fusion value (123 J/g) and an encapsulation ratio of 85.85%, and this could be used as an appropriate material for thermal energy storage applications . Şahan and Paksoy used stearic acid as a PCM core material to obtain form‐shapeable PCM composites.…”

Section: Introductionmentioning

confidence: 93%

Preparation and characterization of paraffin microcapsules for energy‐saving applications

J of Applied Polymer Sci

Gumus

2019

Self Cite

A series of microencapsulated phase‐change materials (PCMs) with styrene–divinyl benzene shells composed of an n‐octadecane (OD or C18)–n‐hexadecane (HD or C16) mixture as the core were synthesized by an emulsion polymerization method. The effects of the core/shell ratio (C/S) and surfactant concentration (Csurf) on the thermal properties and encapsulation ratios of the PCMs were investigated. The chemical structures and morphological properties of the microcapsules were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy analysis, respectively. The characteristic peaks of the paraffin mixtures and shell material located in the FTIR spectrum of the microencapsulated PCMs proved that the encapsulation of the PCM mixture was performed successfully. The thermal properties of the paraffin microcapsules were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis. DSC analysis demonstrated that the microcapsules containing the maximum amount of paraffin mixture (C/S = 2:1) and the minimum Csurf (45 mmol/L) had the highest latent heat value of 88 kJ/kg and a latent heat of temperature of 21.06°C. Moreover, the maximum encapsulation ratio of the paraffin mixture was found to be 56.77%. With respect to the analysis results, the encapsulated binary mixture, which consisted of OD–HD with a poly(styrene‐co‐divinyl benzene) shell, is a promising material for thermal energy storage applications operating at low temperatures, such as in the thermal control of indoor temperatures and air‐conditioning applications in buildings for desirable thermal comfort and energy conservation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47874.

“…Termoplastik bir polimer olan polistiren ucuz, sert, toksik olmayan, kolaylıkla işlenebilme ve iyi ısı yalıtım özelliğiyle panel sistemlerinde ve bina yapı malzemelerinde köpük formunda kullanılmaktadır [4]. Bu özelliklerinden dolayı polistirenin FDMlerin kapsülasyonunda kabuk olarak kullanılması oldukça avantajlıdır [30,31].…”

Section: Introductionunclassified

Isil Enerji̇ Depolama Malzemesi̇ Olarak Kompozi̇t Faz Deği̇şti̇ren Maddeleri̇n Hazirlanmasi Ve Karakteri̇zasyonu

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

Bayram

2020

Self Cite

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.