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The development of azeotropic ammonia refrigerant blends for industrial process applications.

Author(s) : COX N., MAZUR V., COLBOURNE D.

Summary

It would be desirable to design an azeotropic ammonia mixture with higher pressure to avoid the disadvantages of pure ammonia. The objective is to determine the appropriate proportions for a mixture that would allow this blend to be employed for food blast freezing applications in the temperature range from -55 to 50°C. Ammonia has a high normal boiling point and low specific heat. Low evaporating temperatures lead to subatmospheric operation allowing leakage of air into the system, and high compressor discharge temperatures. The selected blend overcomes these drawbacks by significantly reducing the normal boiling point and allowing lower discharge temperatures. It will displace liquid nitrogen and carbon dioxide cryogenic freezers as well as carbon dioxide/ammonia cascade and two stage ammonia systems. The following findings were made relative to R-717: COP similar; volumetric refrigerating effect higher; discharge temperature significantly lower, improving reliability; improved heat transfer; higher evaporating temperatures; degradation of COP and refrigerating capacity with increasing temperature lift reduced. Patents have been filed and published and global licensees are now being sought.

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Pages: 2009-2

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Details

  • Original title: The development of azeotropic ammonia refrigerant blends for industrial process applications.
  • Record ID : 2009-1434
  • 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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