商用制冷设备常因安装时存在的可溶性和半可溶性污染物以及系统运行中产生的污染物而发生故障，通常发生在控制部件中。本文描述了用40%活性炭（按重量计）改性的活性氧化铝干燥芯获得的结果。这种改进型芯的设计目的是将蜡状污染物的影响降至最低，这些污染物在启动时存在于许多系统中。这篇文章表明，干燥器可以去除低温系统中的蜡，还报告了它可以去除其他材料，如树脂、清漆和油树脂，这些材料会导致高温系统（包括空调）中的故障。本文提供的数据包括从实验室工作、基础广泛的现场报告以及具体的现场报告中得出的数据，以及从一个非常大的系统的显微镜检查中得出的数据，该系统不会对正常有效的补救措施作出反应。 引文:美国密苏里州堪萨斯城ASHRAE学报第76卷第2部分

Commercial refrigeration equipment is subject to malfunction, usually in control components, caused by soluble and semi-soluble contaminants that are present both at the time of installation and generated in the operation of the system. This paper describes results obtained using activated alumina drier cores modified by incorporating 40% activated charcoal by weight. This modified core was designed to minimize the effect of wax-like contaminants which were shown to be present in many systems at the time of start-up. This article shows that the drier removes wax in low temperature systems and also reports that it may remove other material such as resins, varnish and oleo resins that cause malfunction in higher temperature systems including air conditioning.The data presented herein, includes that drawn from laboratory work, from broad based, as well as specific, field reports, and from a microscopic examination of one very large system which would not respond to normally effective remedies.