Compressed air is used in various applications such as spraying, food, processing, and luxury goods industries. Equipment used to generate dry compressed air includes refrigerated air dryers. By cooling compressed air to almost freezing point, any water vapor and oil in the air will condense and precipitate. The two main cost factors related to this process are energy consumption and the need to compensate for any compressed air loss, therefore the market demand for variable frequency refrigerated dryers with electronic expansion valves is increasing.