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Estimation of environmental concentrations and deposition fluxes of R1234yf and its decomposition products emitted from air-conditioning equipment to atmosphere.

Number: pap. NS24

Author(s) : KAJIHARA H., INOUE K., YOSHIDA K., et al.

Summary

The use of hydrofluorocarbons (HFCs) as refrigerants in air conditioning equipment is of great concern because this could lead to global warming since the global warming potential (GWP) of HFCs is high. Therefore, substances with high reactivities and shorter lifetimes in the troposphere have been considered as candidates for next-generation refrigerants. However, substances with shorter lifetimes may cause the decomposed products to have high local concentrations, which, in turn, may affect the atmospheric environment. Hence, concentration estimation and environmental impact assessment of the decomposed products of refrigerants must be conducted. R1234yf (CF3CF=CH2), is a next-generation refrigerant candidate with a low GWP of four. However, the photochemical reaction of R1234yf due to its high reactivity with OH radicals can contribute to ozone production in the troposphere. Moreover, trifluoroacetic acid (TFA), which is the final product of R1234yf decomposition, is strongly acidic and hence could cause ecological effects. In this paper, the authors assume that R1234yf is used as the refrigerant in air conditioning equipment in Japan, and we estimate the environmental concentrations of the refrigerant and its decomposed products by using an atmospheric dispersion model.

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Pages: 8 p.

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Details

  • Original title: Estimation of environmental concentrations and deposition fluxes of R1234yf and its decomposition products emitted from air-conditioning equipment to atmosphere.
  • Record ID : 30000588
  • Languages: English
  • Subject: Environment, General information
  • Source: Measures to address climate change. 2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology: February 17-19, Tokyo, Japan.
  • Publication date: 2010/02/17

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