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Laboratory studies of stability of low GWP refrigerants.

Number: pap. n. TP-080

Author(s) : LECK T. J., HYDUTSKY B. W.

Summary

Concern about global climate change has led to regulations, and proposals for more regulations, concerning properties of refrigerant gas that can be used to achieve cooling while minimizing potential impacts on the environment. As a result of these climate change related concerns, new refrigerants have been developed, including HydroFluoroOlefin (HFO) molecule based refrigerant candidates. In addition, new consideration is being given to other low GWP molecules, such as R32, R152a and R161. These molecules have shorter atmospheric lifetimes, and hence lower direct GWP values as compared to most conventional commercial HFC molecules used currently in HVACR applications. However, since these LGWP molecules react and decompose more rapidly in the atmosphere than conventional HFCs, it is important to know if they will also react and decompose more quickly inside an AC or Refrigeration system. Laboratory studies have been conducted to compare the chemical and thermal stability of these low GWP molecules for use in HVACR applications. The question of stability of these low GWP molecules, especially in the presence of potential refrigeration system contaminants such as air and water has been raised. Tests were performed with and without added lubricants, water, and air. Results of this array of designed experiments show that high levels of contamination by air is detrimental to the stability of all of the refrigerants and lubricants evaluated, even legacy CFC, HCFC, and HFC refrigerants. However, very low levels of air or water do not negatively impact stability of HFOs to any greater extent than for legacy refrigerants.

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Pages: 8 p.

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Details

  • Original title: Laboratory studies of stability of low GWP refrigerants.
  • Record ID : 30008307
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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