Comparative Performance of Phase Change Materials for Solar Thermal Storage System
Keywords:
Computational Fluid Dynamics CFD, Phase Change Material (PCM), Thermal energy storage (TES), Solar domestic hot water (SDHW), Heat Transfer Fluid (HTF)Abstract
This paper is aimed at understanding the melting behavior of different Phase Change Materials (PCM) encapsulated in a spherical capsule. The melting process of PCM enclosed in spherical capsule has been investigated computationally and experimentally in the range of parameters useful for solar water heating applications. CFD predictions of the melting of two different PCMs viz. savE® HS-58 and Paraffin wax (PW) inside a spherical capsule have been obtained. Experiments are performed by fixing the thermocouples in PCM inside a spherical capsule at various radial positions for HTF temperature of 70oC with a capsule of radius 41 mm. It can be inferred that melting point of HS-58 is in close requirement of solar water heating application with highest latent heat 247 kJ/kg compared to 190 kJ/kg of Paraffin Wax. Further Specific heat of HS-58 is also higher than PW and HS-58 is a mixture of organic and inorganic compound. It is also noticed that for the same weight HS-58 stores 19% of more heat with less volume compared with PW at average HTF temperature of 70oC around the spherical capsule.
Keywords: Computational Fluid Dynamics CFD, Phase Change Material (PCM), Thermal energy storage (TES), Solar domestic hot water (SDHW), Heat Transfer Fluid (HTF)
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