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Generation, crystal fraction and viscosity of K2HPO4·6H2O-PCS.

Number: pap. 0047

Author(s) : SCHMIT H., PAUCKNER D., LINN J., et al.

Summary

The salt hydrate K2HPO4·6H2O has a melting temperature of around 14 °C, a melting enthalpy of 177 J g-1, and shows inhibited crystal growth. Due to these properties, K2HPO4·6H2O is a candidate as a phase change slurry (PCS). In this work, it is demonstrated, that the crystal fraction of K2HPO4·6H2O-PCS can be determined by using a turbidity sensor. Generation of K2HPO4·6H2O-PCS is possible by using the hydroscraped slurry generator method. However, with the used test setup, the limit of the crystal fraction was around 14 wt% due to clogging in the heat exchanger. Due to the formation of K2HPO4·3H2O in K2HPO4·6H2O-PCS, it was not possible to determine the viscosity of K2HPO4·6H2O-PCS. Therefore, the viscosity of K2HPO4·6H2O-PCS* with a slightly higher water content than K2HPO4·6H2O-PCS was determined. It was found, that up to about 16 wt% crystal fraction, the viscosity of K2HPO4·6H2O-PCS* increased to 1.7 relative to the purely liquid phase.

Details

  • Original title: Generation, crystal fraction and viscosity of K2HPO4·6H2O-PCS.
  • Record ID : 30023819
  • Languages: English
  • Source: 12th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Orford, Canada, May 21-23, 2018.
  • Publication date: 2018/05/21
  • DOI: http://dx.doi.org/10.18462/iir.pcm.2018.0047
  • Document available for consultation in the library of the IIR headquarters only.

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