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Properties and other aspects of aqueous solutions used for single-phase and ice slurry applications.

Author(s) : MELINDER Å.

Summary

Indirect systems with aqueous solution used as secondary working fluids (secondary refrigerants or coolants) have long been used making it possible to minimize the charge and leakage of (primary) refrigerant. In ice slurry applications such aqueous solutions are used below the freezing point, benefitting from the enthalpy change resulting from ice melting. Accurate thermophysical property data and a general knowledge of other secondary fluid properties are useful for choice of suitable fluid and for technical calculations of the system. An extensive research with the aim to establish reliable data resulted in an IIR publication (Melinder 1997). Since then work has been carried out to update and extend such data for a new IIR publication intended to be published in 2009. Property values have been included for lower concentrations of the additive where ice slurries have best potential. Two tables are as an example here given for aqueous solutions of sodium chloride. One table gives density, mixing properties, index of refraction, surface tension and specific conductance at 20°C. The other table gives thermophysical fluid properties, here only for low concentrations. Polynomial equations and coefficients used in an Excel-program for simple technical calculations are outlined. The new IIR publication includes other properties and aspects of the aqueous solutions used and it considers corrosion and material compatibility as well as environmental impact of such fluids. A summary is given with characteristics of aqueous solutions used for ice slurries. Property relations are given of ice and of fine crystalline ice slurry as well as enthalpy phase diagrams and charts with equilibrium values of ice mass fraction, enthalpy and density of ice slurries of sodium chloride and water. Hopefully this new IIR publication will prove to be useful for industry and researchers working with single-phase as well as ice slurry applications.

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Pages: 2009-4

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Details

  • Original title: Properties and other aspects of aqueous solutions used for single-phase and ice slurry applications.
  • Record ID : 2009-1645
  • Languages: English
  • Source: 8th Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning
  • Publication date: 2009/06/03

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