The Effect of Additives on the Crystallization PCM CaCl₂.6H₂O for Stabilizing the Air Temperature for Energy Conservation

Abstract:

Phase Change Material (PCM) is a material that uses the phase transition properties as latent heat storage for certain application. Salt hydrate CaCl₂.6H₂O (melting temperature, T_m = 29°C, and melting entalphy, DH = 190 kJ/kg) is a common inorganic PCM that can be used for regulating the air temperature of the room, in order to reduce the electrical energy consumption for energy conservation. General problems of inorganic PCM, in particular during the crystallization or latent heat release, are the subcooling and phase separation effects. It is worth mentioning that understanding the crystallization of PCM is important to keep its performance for application. In this research we choose two types additive materials as nucleator to CaCl₂.6H₂O to overcome those two negative effects, namely Ba₂CO₃ and K₂CO₃. We also study the amount of additives needed for effective reduction of subcooling and its phase stability by performing the cycling process. The average temperature and maximum temperature of the subcooling will be determined from temperature vs time recording.

• Periodical: Advanced Materials Research (Volume 1112)
• Pages: 563-566
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1112.563
• Online since: July 2015
• Authors: Nia Kurniati, Ivylentine Datu Palittin, I.M. Sutjahja*, Daniel Kurnia
• Keywords: CaCl₂.6H₂O, Nucleation, Phase Change Materials (PCM), Phase Separation, Subcooling

References

[1] A. Sharma, V.V. Tyagi, C.R. Chen, D. Buddhi, Review on Thermal Energy Storage with Phase Change Materials and Applications, Renewable and Sustainable Energy Reviews 13 (2009) 318-345.

DOI: 10.1016/j.rser.2007.10.005

[2] H. Mehling, L.F. Cabeza, Heat and Cold Storage with PCM –an up to date introduction into basics and applications, Springer, Berlin (2008) 11-55.

DOI: 10.1007/978-3-540-68557-9

[3] I. Dinçer and M. A. Rosen, Thermal Energy Storage: Systems and Applications, John Wiley & Sons, Ltd (2011) 105-137.

[4] O. H. Koenigsberger, T. G. Ingersoll, A. Mayhew, and S. V. Szokolay, Manual of Tropical Housing and Building, Longman, London (1974) 320.

[5] G.A. Lane, Phase Change Materials for Energy Storage Nucleation to Prevent Supercooling, Sol Energ Mat Sol C. 27 (1991) 135-160.

[6] F. Ostendorf, CarstenSchmitz, et all, Evidence for Potassium Carbonate Crystalliteson Air-Cleaved Mica Surface, Langmuir Article 25/18 (2009)10764–10767.

DOI: 10.1021/la901311k