Abstract
The literature shows that inorganic phase change materials (PCM) have been very seldom microencapsulated, so this study aims to contribute to filling this research gap. Bischofite, a by-product from the non-metallic industry identified as having good potential to be used as inorganic PCM, was microencapsulated by means of a fluidized bed method with acrylic as polymer and chloroform as solvent, after compatibility studies of both several solvents and several polymers. The formation of bischofite and pure MgCl2·6H2O microcapsules was investigated and analyzed. Results showed an efficiency in microencapsulation of 95% could be achieved when using 2 min of fluidization time and 2 kg/h of atomization flow. The final microcapsules had excellent melting temperatures and enthalpy compared to the original PCM, 104.6 °C and 95 J/g for bischofite, and 95.3 and 118.3 for MgCl2·6H2O.
Highlights
In recent years, the use of thermal energy storage (TES) with latent heat storage has become a very popular topic within researchers
There is a need for different microencapsulation of phase change materials (PCM) and of organic been widely microencapsulated by many methods, microencapsulation inorganic
This paper shows that fluidization is a good method to do so, since this study microencapsulated by many different methods, microencapsulation of inorganic PCM has been not shows that efficiencies of around achieved microencapsulting puretoMgCl
Summary
The use of thermal energy storage (TES) with latent heat storage has become a very popular topic within researchers. The main advantage of latent heat storage is the high storage density in small temperature intervals, showing very big potential to be used in building applications [1]. In most cases, the materials used in latent heat storage, known as phase change materials (PCM), need to be encapsulated to avoid leakage when it is in the liquid phase. Microencapsulation serves several purposes, such as holding the liquid PCM and preventing changes of its composition through contact with the environment; improving material compatibility with the surrounding, through building a barrier; improving handling of the PCM in a production; reducing external volume changes, which is usually a positive effect for an application; improving heat transfer to the surrounding through its large surface to volume ratio; and improving cycling stability since phase separation is restricted to microscopic distances
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