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Determining thermophysical properties of lithium and calcium chloride aqueous solutions as low temperature secondary working fluids.

Soluciones acuosas de cloruro de litio y cloruro de calcio como fluidos secundarios de trabajo a baja temperatura: determinación de las propiedades termo físicas.

Author(s) : MELINDER Å.

Type of article: Periodical article

Summary

This article is the Spanish translation of an article presented at the 22nd IIR international Congress in Beijing, China (see the Bulletin of the IIR, reference 2007-2641). Secondary working fluids (secondary refrigerants, heat transfer fluids, etc.) are used for a variety of indirect refrigeration applications, incl. freezers in supermarkets and some applications at even lower temperatures. An ideal secondary working fluid should possess good thermo-physical properties. Besides giving sufficient freezing protection it should have good heat transport capacity, give good heat transfer and give small pressure drop for the system fluid flow. Commonly used secondary working fluids can often not be used in low temperature applications. Aqueous salts, such as calcium chloride and potassium salts are used, but not at operation temperatures below -35°C, as freezing points below -45°C then are needed, getting too close to the eutectic temperature. However, the eutectic temperature of lithium chloride - water is below -65°C. Thermophysical properties of lithium chloride have been studied with sorption dehumidification in view at higher temperatures. This paper focuses on a literature search and some measurements to establish technically reliable thermophysical property values for aqueous solutions of lithium chloride, especially for temperatures below 0°C. The thermo-physical properties examined are freezing point, density, specific heat, thermal conductivity, viscosity. Viscosity of calcium chloride is also considered as low temperature values in refrigeration handbooks differ from some measurements recorded in literature and by the author.

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Pages: 32-42 (9 p.)

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Details

  • Original title: Soluciones acuosas de cloruro de litio y cloruro de calcio como fluidos secundarios de trabajo a baja temperatura: determinación de las propiedades termo físicas.
  • Record ID : 2009-0621
  • Languages: Spanish
  • Source: IIF-IIR/Frío Calor Aire acond. - vol. 37 - n. 411
  • Publication date: 2009/02

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