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Properties and other aspects of aqueous ammonia solutions for indirect refrigeration systems.

Author(s) : MELINDER Å.

Summary

Indirect systems with aqueous solution used as secondary working fluids (secondary refrigerants, brines) have long been used making it possible to minimize the charge and leakage of (primary) refrigerant. Only a few systems have in recent years been installed with aqueous solutions of ammonia although many are aware that ammonia-water has quite favourable thermophysical properties compared to other water solutions. Accurate thermo-physical property data and also a general knowledge of other secondary fluid properties are needed for choice of suitable concentration and for technical calculations of the system. Figures show that few data were found for ammonia solutions for temperatures below 0°C except for the freezing point. Additional research to update and extend data for various fluid types and applications will result in a new publication entitled Properties of secondary working fluids for indirect systems intended to be published by IIR in 2009. Among fluid properties considered are freezing point and additive concentration, density, index of refraction, specific heat, thermal conductivity and viscosity. Polynomial equations and coefficients used in an Excel-program are an aid to determine property values and can be used for simple technical calculations. Other figures show computer program agreement with original table values and with some commercial product data. Other properties and aspects of the aqueous solutions used, such as boiling point, flash point, vapour pressure, surface tension, specific conductance and pH-value are considered. The new publication will cover corrosion and material compatibility in aqueous solution systems and environmental impact of such fluids, incl. direct toxicity and biodegradability. Hopefully this new publication will prove to be useful for industry and researchers working with ammonia-water in various applications.

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Pages: 2009-2

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Details

  • Original title: Properties and other aspects of aqueous ammonia solutions for indirect refrigeration systems.
  • Record ID : 2009-1643
  • Languages: English
  • Source: 3th Conference on Ammonia Refrigeration Technology. Proceedings: Ohrid, North Macedonia, May 7-9, 2009.
  • Publication date: 2009/05/07

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