R-134a EMISSION PREVISIONS BASED ON IDENTIFICATION OF DIFFUSION COEFFICIENT OF POLYMERS USED IN MOBILE AIR-CONDITIONING COMPONENTS
In Europe, mobile air conditioning (MAC) systems using R-134a will be tested as of 2007 in order to guarantee an 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.
Y.YU D.CLODIC
Ecole des Mines de Paris, Center for Energy and Processes 60, boulevard Saint-Michel– F–75272 Paris Cedex 06, France
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）