Abstract
Indirect systems with aqueous solution have long been used to minimize the charge and leakage of (primary) refrigerants. 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 selection of fluid and for technical calculations of the system. This paper introduces a new IIR publication, Properties of secondary working fluids for indirect systems. Tables and charts with fluid properties, property relations of ice and of ice slurry, enthalpy-phase diagrams and related charts are here given for sodium chloride and water, as an example. This new IIR publication that also considers corrosion aspects and environmental impact of such fluids is intended to be used by industry and researchers working with single phase as well as ice slurry applications.
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