Microencapsulated oleic–capric acid/hexadecane mixture as phase change material for thermal energy storage
Thermal energy storage systems provide efficiency in order to have better utilization of energy sources while protecting the environment. Thermal energy storage can be classified as sensible and latent heat storage. The storage of latent heat allows a greater density of energy storage with a narrow temperature range during phase change. Phase change materials (PCMs) are important novel materials, which are used as the storage of thermal energy as latent heat, and can provide utilization of waste heat energy. In this study, the capric acid and oleic acid mixture containing hexadecane were encapsulated as the core with styrene–divinylbenzene copolymer shell by emulsion polymerization technique. Thermal properties of fatty acid microcapsules were characterized by differential scanning calorimetry and thermogravimetric analysis and also their morphology and structure were examined by scanning electron microscopy, polarized optical microscopy and Fourier transform infrared spectroscopy (FT-IR), respectively. The heat storage property of microencapsulated PCM was tested in a horizontal air flow channel system equipped with a flat heating plate, air fan and air flow sensors. The microencapsulated PCM was prepared successfully, and results of the analysis presented that this material is promising candidate for potential heating and cooling system applications.
KeywordsEnergy Phase change material Encapsulation Thermal energy storage
The authors appreciate the support of Research Fund of Yalova University (Project Number: 2017/YL/008) for the accomplishment of this work. Authors thank Dr. Ali Karaipekli (Çankırı Karatekin University, Turkey) for DSC analyses.
- 15.Bellemare JV. Thermally reflective encapsulated phase change pigment, United States Patent office. 2007; No. 0031652 A1.Google Scholar
- 16.Zhang X, Chao N, Zhang X, Xu J. Natural microtubule encapsulated phase- change materials and preparation thereof, United States Patent office. 2010; No. 0071882A1.Google Scholar
- 17.Hart RL, Work DE Flame resistant microencapsulated phase change materials, United States Patent office. 1995; No. 5, 435,376.Google Scholar
- 18.Hatfield JC. Encapsulation of phase change materials, United States Patent office. 1987; No. 4, 708,812.Google Scholar
- 21.Sharma A, Shukla A, Chen CR, Wu TN. Development of phase change materials (PCMs) for low temperature energy storage applications. Sustain Energy Technol Assess. 2014;7:17–21.Google Scholar
- 33.Azad ARM, Ugelstad J, Fitch RM, Hansen FK. Emulsification and emulsion polymerization of styrene using mixtures of cationic surfactant and long chain fatty alcohols or alkanes as emulsifiers. ACS Symp Ser. 1976;24(1):1–23.Google Scholar
- 35.Meltzer V, Pincu E. Thermodynamic study of binary mixture of citric acid and tartaric acid. Cent Eur J Chem. 2012;10(5):1584–9.Google Scholar