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New high pressure low-GWP azeotropic and near-azeotropic refrigerant blends.

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

Summary

This paper describes the latest findings of a project to identify azeotropic and near-azeotropic mixtures with a normal boiling point of between -40 and -80°C. The aim was to match the saturated pressure-temperature characteristics and refrigerating capacity of existing refrigerants within this range (such as R410A and R744), whilst achieving higher critical temperatures and - where relevant - lower triple point temperatures. Thus, the intended outcome is an extended range of applicability and an improvement in energy efficiency. Of a large number of potential combinations, three azeotropic and near-azeotropic mixtures have been selected, all formed from natural refrigerants or synthetic chemicals with a global warming potential of less than 150. These mixtures were subject to a variety of analyses, including thermodynamic, performance and safety assessments. Patents have been filed and published and global licensees are now being sought.

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Details

  • Original title: New high pressure low-GWP azeotropic and near-azeotropic refrigerant blends.
  • Record ID : 2009-0025
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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