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Investigation of the nucleation temperature of different heat exchanger surfaces in an ice store.

Number: pap. n. 164

Author(s) : OECHSLE U., SPINDLER K.

Summary

During loading ice stores, an ice layer forms on the heat exchanger surface once the surface reaches nucleation temperature. The growing ice layer increases the heat conduction resistance; the loading performance decreases. In this work, the loading performance shall be optimized by changing the surface structure of the heat exchanger to lower the nucleation temperature. The ice store is loaded with an ice-free heat exchanger while ice grows apart from the heat exchanger. The nucleation temperatures of heat exchangers of different materials with different surface roughness’s and hydrophobic plasma coatings are examined in a model ice store. Furthermore, the nucleation temperatures of the heat exchanger surfaces are calculated using the classical nucleation theory and are compared to the experiments. It is shown that the smoothest heat exchanger surface with a hydrophobic plasma coating lowers the nucleation temperature best. The loading performance is optimized.

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  • Original title: Investigation of the nucleation temperature of different heat exchanger surfaces in an ice store.
  • Record ID : 30026366
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0164

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