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R-134a emission previsions based on identification of diffusion coefficient of polymers used in mobile air-conditioning components.

Author(s) : YU Y., CLODIC D.

Summary

In Europe, mobile air conditioning (MAC) systems using R-134a will be tested as of 2007 in order to guarantee initial leak tightness, the annual emissions shall be lower than 40 g/year according to the Directive 2006/40/CE (EU, 2006). Leak tightness of almost all parts of MAC system is linked to the diffusion through polymeric materials (seals and hoses). Thus, permeation and diffusion of gas through these materials play a fundamental role in emission previsions. This paper focuses on mass transport mechanism of refrigerant through polymers and aims at identifying the permeation and diffusion coefficients of different types of materials. Simulation models for steady state and transient state, using finite element method, allows interpreting experimental results, and particularly for complex structures (hoses are multi-layer components). Based on experimental studies, a theoretical model is proposed to predict emissions of MAC hoses as a function of pressure and temperature.

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Pages: ICR07-B1-1594

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Details

  • Original title: R-134a emission previsions based on identification of diffusion coefficient of polymers used in mobile air-conditioning components.
  • Record ID : 2008-0368
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/07/21

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