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Observations of water-cooled chillers with tube-in-shell heat exchangers operated with mildly zeotropic low pressure refrigerant blends.

Number: 2117

Author(s) : SCHULTZ K.

Summary

The Montreal Protocol categorized R123 (2,2-dichloro-1,1,1-trifluoroethane) as an ozone depleting substance (ODS) and forced the phase-out of its use in new products after December 31 2019 in developed countries and in Article 5 countries beginning in 2030. This led to the development of R1233zd(E) as a single molecule alternative for use in low pressure water chillers. However, R1233zd(E)’s operating pressures are significantly higher than those of R123, requiring new components and systems specifically designed for those higher operating pressures. R514A has been developed as a design-compatible replacement for R123. An azeotropic blend with negligible temperature glide, R514A behaves similarly to a single molecule refrigerant, allowing existing designs and equipment to continue to be used with relative ease. A binary zeotropic blend with a temperature glide of approximately 1 K was identified early on during the search for an R123 replacement. The properties of this blend were similar to R123, making it a potentially design compatible alternative. Tests were run in two R123-based chillers with tube-in-shell heat exchangers to characterize the performance of this blend. This paper reports observations made during those tests, in particular, the fractionation (shifts in composition) of the fluid that occurred within the chiller and the consequences of this phenomenon on assessing the performance of the chiller.

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  • Original title: Observations of water-cooled chillers with tube-in-shell heat exchangers operated with mildly zeotropic low pressure refrigerant blends.
  • Record ID : 30030472
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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