Different Types of Air Dryers

March 19, 2021

By Marc-André Brault, National Marketing & Communications Coordinator, Proax Technologies

But first, why?

Before diving deep into air dryers, it’s important to understand the components involved in an industrial air system. Air dryers are one of many elements that comprise the installation even before providing key airflow to your numerous machines. An air compressor draws in the atmosphere from its surroundings and compresses the air which passes through an aftercooler before being stored in the tank, where the compressed air is stored will be contained until needed. The pressurized air travel through a “mainline filter” into an air dryer.

Optimize the Air Quality to Prevent Problems

The same way you do not want dust, dirt, oil or other harmful particles your machines, you do not want water in your air system. But how is this water created in the first place? As a large quantity of air is “pressed” together, some water vapor contained in that air is swooped inside the air tank or reservoir. During this process, heat is generated and relative humidity level increases dramatically, enough to reach 100%. It’s when the compressed air cools down that water vapor turns into liquid, tiny water droplets. That’s condensation, remember your physics class? Note that using an after cooler between the air compressor and the air tank will reduce both the heat and the humidity. But depending on the application, machines, and/or air tools used at the end of the line, putting in place preventive barriers and fail-safes will pay big money and save you a precious amount of time.

The danger is when you’re not using the proper air dryer setup. You’re sending these tiny water droplets downstream into the airline, this can lead to a build-up that will eventually cause rust, lubricant leaking and even freezing if the piece of equipment is exposed to low temperature. If the ports get clogged, that means the airflow is unstable and some parts of the airline will have to work harder in order to provide the same efficiency. For example, if an air cylinder needs to push something and the air pressure is too low, it will be impossible for the cylinder to do its job, and increasing the air demand will only put more strain on the global airline. Putting some key components at risk.

Many types, same goal: reduce moisture

Air dryers come in many shapes and forms, although there’s a broad variety of dryers, the two most common types are refrigerant and regenerative desiccant. We’ll look at refrigerant in this article.

Refrigerant

Cycling

Cycling refrigerant air dryers are suitable for most industrial applications, featuring a compact design and stainless steel heat exchanger. These standard inlet air temperature models (max. 122~149°F [50~65°C]) reliably generate dew points down to 37°F (2°C). The dew point is basically the moment where gas will become liquid, so in our case when water vapor condensate into water droplets. Note that the atmospheric dew point tends to vary in comparison to pressure dew point (PDP), which is evaluated at 37.5°F.

Non-Cycling

Non-cycling refrigerant air dryers are similar to cycling in the way they both used refrigerant as a cooling source. The main difference is that the refrigerant circulates continuously through the system. This has its advantages and disadvantages, you could compare a cycling type to your standard kitchen refrigerator. While the non-cycling type is more like a sub-system living inside your air system. Working consistently, even when the air demand is almost zero (partial and zero airflow).

Source

Related Articles


Latest Articles

  • Festo Didactic Showcases Technical Education and Training at Hannover Messe 2025

    Festo Didactic Showcases Technical Education and Training at Hannover Messe 2025

    May 20, 2025 By Krystie Johnston Hannover Messe 2025 was an extra special event for Festo. The Festo Group celebrated their 100th anniversary, Festo Canada celebrated their 50th anniversary, and Festo Didactic celebrated their 60th anniversary. Festo Didactic, the education arm of the company, understands how important education is for empowering individuals, driving economic growth,… Read More…

  • EtherCAT in Boost Mode

    May 14, 2025 EtherCAT and PC-based control in test bench technology EtherCAT is by far the fastest Industrial Ethernet technology. Nevertheless, the data acquisition process at Kraus & Naimer’s cam controller test benches called for an even shorter bus cycle. To achieve the required performance, Beckhoff specialists reduced the previous cycle time from 100 µs… Read More…


Featured Article

Revolutionizing Material Movement with Autonomous Mobile Robots

Revolutionizing Material Movement with Autonomous Mobile Robots

In today’s fast-paced manufacturing and logistics industries, the need for efficient and flexible material movement solutions has never been greater. Traditional methods like conveyor systems, forklifts, and manual pushcarts have served us well, but they come with limitations.

That’s why Omron is thrilled to announce the launch of their game-changing MD Series of Autonomous Mobile Robots (AMRs). Read more


Products

  • Electromate to Offer UR7e, UR12e & UR15 Collaborative Robots from Universal Robots

    May 20, 2025 Electromate is expanding its lineup of collaborative automation solutions with the addition of three advanced models from Universal Robots: the UR7e, UR12e, and UR15. These robots provide enhanced options for payload, reach, and precision in demanding collaborative applications. The UR7e delivers a 7 kg payload, 1300 mm reach, and ±0.03 mm repeatability. Positioned between the UR5e and… Read More…

  • Redefining Non-Invasive Temperature Measurement

    May 14, 2025 iTHERM SurfaceLine TM611 provides accuracy and response time comparable to invasive temperature measurement. The non-invasive thermometer iTHERM SurfaceLine TM611 by Endress+Hauser can be used across all industries for a wide range of demanding industrial applications. The surface-mounted thermometer measures process temperature without the risk of leakage and flow disruption. A specially designed… Read More…