Air Dryers

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Air quality has a significant impact on every component in a compressed air system. Properly treated compressed air will improve productivity, system efficiency and product quality. Acompressed air dryer is a device that removes water vapor from compressed air.

Excessive water in compressed air, in either the liquid or vapor phase, can cause a variety of operational problems for compressed air users. These include freezing of outdoor air lines, corrosion in piping and equipment, malfunctioning of process control instruments, fouling of products, and more.

Types of compressed air dryers:

  • Refrigerated Compressed Air Dryers: These units utilize a mechanical refrigeration system to cool the compressed air resulting in moisture being removed by the condensing water. This is achieved through two methods, Non-Cycling and Cycling.
    • Non-Cycling Compressed Air Dryer:  This system uses cool compressed air by allowing the warm compressed air into one side of an evaporator while low pressure, refrigerant flows into another side of the evaporator. The heat from the compressed air “boils” the refrigerant thereby reducing the temperature of the compressed air.
    • Cycling Compressed Air Dryer: Cycling refrigerated dryers have refrigeration systems that run when cooling is needed and shut off when it is not. This cycling of the refrigeration compressor results in significant energy savings on most compressed air systems. On average, cycling compressed air dryers provide energy savings of 50% when compared to non-cycling designs.
  • Desiccant Air Dryers: Utilize chemicals beads, called desiccant, to absorb water vapor from compressed air.
    • Heated Desiccant Air Dryer: These units allow the desiccant to be regenerated by heating either directly or indirectly. Heated desiccant air dryers have longer cycles and work well in large CFM applications.
    • Heatless Desiccant Air Dryers: The desiccant in these units is regenerated by using the hot compressed air, the downside is these units consume some of the compressed air.
    • Blower purge Air Dryer: By taking atmosphere air in through a blower the air is heated and channeled to remove the moisture off the desiccant. This highly economical method ensures that no compressed air is consumed in the desiccant drying process.

ISC’s compressed air specialists are here to help you decide which dryer is perfect for your application. Simply visit our compressed air dryers webpage, or call us at 972-964-2700 to speak with a compressed air specialist.