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Evaluation of binary and ternary refrigerant blends as replacements for R134a in an air-conditioning system.

Number: pap. 2110

Author(s) : BELL I., DOMANSKI P., LINTERIS G. T., et al.

Summary

We investigated refrigerant blends as possible low-GWP (global warming potential) alternatives for R134a in an airconditioning
application. We carried out an extensive screening of the binary and ternary blends possible among a list of 13 pure refrigerants comprising four hydrofluoroolefins (HFOs), eight hydrofluorocarbons (HFCs), and carbon dioxide. The screening was based on a simplified cycle model, but with the inclusion of pressure drops in the evaporator and condenser. The metrics for the evaluation were nonflammability, low-GWP, high COP (coefficient of performance), and a volumetric capacity similar to the R134a baseline system. While no mixture was ideal in all regards, we identified 14 “best” blends that were nonflammable (based on a new estimation method by Linteris, et al., presented in a companion paper at this conference) and with COP and capacity similar to the R134a baseline; the tradeoff, however, was a reduction in GWP of, at most, 51% compared to R134a. An additional eight blends that were estimated to be “marginally flammable” (ASHRAE Standard 34 classification of A2L) were identified with GWP reductions of as much as 99%. These 22 “best” blends were then simulated in a more detailed cycle model.

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Pages: 12

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Details

  • Original title: Evaluation of binary and ternary refrigerant blends as replacements for R134a in an air-conditioning system.
  • Record ID : 30024402
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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