R134a和聚烯烃（POE）制冷剂/油组合的可靠性数据最低，初步测试表明毛细管容易被各种污染物堵塞。一个工业团体设计了一项试验，以加速污染和毛细管堵塞的过程。介绍了该集团成员公司为该集团开发的毛细管应力测试数据。研究了毛细管限制水平和变量之间的关系，包括压缩机类型、油类型、氯水平和湿度水平。对污染物的分析包括视觉描述、红外光谱、扫描电子显微镜检查，以及总氯含量和非氯含量的测量- 制冷剂的可冷凝气体含量。测量油样的含水量、溶解铁和总酸，并进行红外光谱分析。单位:双关键词:1997年，制冷剂，更换，R134a，油，混合物，测试，毛细管，污染物，测量，阻碍，水分，氯化合物，铁，酸，润滑:研讨会，ASHRAE交易，第103卷，第2部分，波士顿1997

Reliability data for R134a and polyolester (POE) refrigerant/oil combination were minimal, and initial testing showed a propensity for the capillary tubes to clog with a variety of contaminants. A test was designed by an industry group to accelerate the process of contamination and capillary plugging. Presents capillary tube stress test data that were developed for this group by its member companies. Investigated the relationship between capillary tube restriction levels and variables including compressor type, oil type, chlorine level, and moisture level. Analysis of the contaminants included a visual description, infrared spectroscopy, scanning electron microscope examination, and measurements of total chlorine content and non-condensable gas content of the refrigerant. Oil samples were measured for moisture level, dissolved iron, and total acid, and an infrared spectral analysis was performed.Units: DualKEYWORDS: year 1997, Refrigerants, replacing, R134a, oils, mixtures, testing, capillary tubes, contaminants, measuring, obstructing, moisture, chlorine compounds, iron, acids, lubricants