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A numerical accelerated life methodology for understanding refrigerant chemical stability in HVACR systems.

Number: pap. 2263

Author(s) : KUJAK S., SORENSON E.

Summary

Today’s air conditioning product and application designers, as a result of climate change contribution concerns from high global warming potential (GWP) refrigerants, are being asked to consider lower GWP refrigerants which may have the potential for decreased chemical stability. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) were developed after years of research and field experiences to determine if they possessed acceptable chemical stability. They presented some chemical stability concerns with materials, however they demonstrated good product reliability when mitigation actions were taken to resolve chemical stability issues. Hydrofluorocarbons (HFCs) were found in general to be more chemically stable than the CFCs and HCFCs. In recent years, the heating ventilation air-conditioning and refrigeration (HVACR) industry has been actively investigating new lower GWP refrigerants, many of which are new molecules with little knowledge available on their chemical stability.

In this paper, we will summarize the current accelerated test methodologies to qualify a new refrigerant for use. The authors will propose a new interpretative numerical methodology for extrapolating small scale highly accelerated laboratory results to real life HVACR operational conditions using a simple thermodynamic model and climate zone data. R-22 will be used as the baseline refrigerant system given the long history of published chemical stability data.

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Pages: 8

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Details

  • Original title: A numerical accelerated life methodology for understanding refrigerant chemical stability in HVACR systems.
  • Record ID : 30024469
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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