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Experimental studies of supercooled ice slurry production.

Author(s) : BEDECARRATS J. P., STRUB F., DAVID T., et al.

Summary

Ice slurry can be generated in different ways. One of them consists in producing ice from supercooled water or aqueous solution. Indeed, water flowing in an exchanger can be cooled at a temperature lower than its melting point without crystallising on the walls of this one. After leaving the exchanger, the supercooled water flow is physically disturbed in order to generate ice crystals. The ice fraction depends on the level of supercooling of the liquid leaving the exchanger and increases by approximately 1.26% per supercooling degree for pure water. The first difficulty is to make the supercooled water flow. In the presented system, the water is supercooled directly into the evaporator of the refrigerating plant. The supercooled water is a fluid which needs special care in handling. The influence of different parameters on its crystallization have been experimentally studied: level of supercooling, flow rate, refrigerant fluid temperature. The results have shown the difficulty to control a plant where the supercooling phenomenon is present. The stochastic character of the crystallization interferes with the reproducibility of the results. However, the results show that it is possible to make supercooled water until -2°C without freezing the water in the exchanger. But, the water outlet optimal temperature is about of -1.6°C with a Reynolds number of 3400 in order to have enough safety margin to avoid the breakdown of supercooling inside the tube of the exchanger.

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Pages: ICR07-B1-1287

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Details

  • Original title: Experimental studies of supercooled ice slurry production.
  • Record ID : 2007-2104
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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