Air Dryer Help< Back
This page will help you decide which type of Air Dryer you need for your application. Feel free to contact us if you'd like some assistance.
Air-Cooled After Coolers
These units remove water produced by the air compressor by cooling the air to within + 10 - + 15 Degrees F of ambient. The after cooler removes most of the pollution in the airstream before doing any damage downstream. They do not, however, bring the dewpoint down to the level of a refrigerated air dryer. (see below) The units are shipped completely assembled and ready to go.
Blower Purge Desiccant Dryers
These twin tower units use the adsorption method to remove moisture from compressed air. Pressure dewpoints ranging from minus 40 to minus 100 Degrees F are achieved by directing the flow of saturated compressed air over a bed of desiccant. A small blower is utilized to dry of the "off line" tower. There is no loss of purge air with the blower unit compared to the 15% used in a standard heatless air dryer (see below) saving valuable air, but the initial cost is a little higher. A coalescing oil filter is put before the dryer and a particulate filter goes after the dryer to help save the dryer from any contamination.
Heat Reactivated Desiccant Dryers
These twin tower units use the adsorption method to remove moisture from compressed air. Pressure dewpoints ranging from minus 40 to minus 100 Degrees F are achieved by directing the flow of saturated compressed air over a bed of desiccant. A small heater is utilized to assist in the drying of the "off line" tower. These units use about 8-10% of purge air compared to the 15% in a standard heatless air dryer (see below) saving valuable air, but the initial cost is a little higher. A coalescing oil filter is put before the dryer and a particulate filter goes after the dryer to help save the dryer from any contamination.
Heatless Desiccant Dryers
These twin tower units use the adsorption method to remove moisture from compressed air. Pressure dewpoints ranging from minus 40 to minus 100 Degrees F are achieved by directing the flow of saturated compressed air over a bed of desiccant. A master controller cycles the flow of compressed air between the towers. While one tower is "on-line" drying, the other tower is "off-line" regenerating. These units use 15% of air from the compressor to dry the desiccant. These have a higher initial cost than a standard refrigerated air dryer (see below), but the quality of air produced is extremely high.
High Temperature Refrigerated Dryers (HTD)
Working much like the refrigerated air dryer (see below), these units are designed to cool the air to remove harmful contaminants. The idea behind the HTD is to pre-cool, refrigerate, dry and re-warm the air to subsequent use. Small compressors can deliver air at a very high temperature, up to 250 Degrees F, and the air needs to be pre-cooled before being dried. The unit comes with a complete after-cooler, separator, and refrigeration system using non-ozone depleting R134 refrigerant.
Refrigerated Dryers
These units purify compressed air by removing dirty water and varnished oil before it can do any damage downstream. Achieving dewpoints from + 35 - + 40 Degrees F, payback, as a result of smoother, faster running equipment, less downtime, less product spoilage, and lower energy cost, begins immediately. These dryers are designed to operate under all load conditions. Working with the same concept as a refrigerator, the air is cooled, then condenses, and then is removed by an automatic drain. It is then re-cooled and sent out to the system clean and dry. All compressed air systems should have an air dryer of some sort.
Turbo Desiccant Dryers
This is a single tower desiccant air dryer that affords the benefits of a twin tower heatless dryer (see above) but with a much lower first cost and much lower operating costs. These units will deliver pressure dewpoints as low as minus 40 Degrees F. It requires no purge and, other than the blower, has no moving parts. Designed specifically for one or two shift operations, the regeneration cycle is set for the off shift, every 48 hours for a single shift operation or every 24 hours for a two shift operation. An industrial blower is utilized to dry the desiccant during the "off-line" cycle. Only 6 hours are required to complete the regeneration cycle at which point the dryer automatically resets and is ready to go "on-line". Turbo dryers cost almost 50% less to operate than a refrigerated air dryer.
Water-Cooled After Coolers
These units remove water produced by the air compressor by cooling the air to within + 10 - + 15 Degrees F of ambient. The after cooler removes most of the pollution in the airstream before doing any damage downstream. Water is the primary cooling source in these units using a tube and shell method. The air flows over a tube of cold water cooling and condensing the air. They do not, however, bring the dewpoint down to the level of a refrigerated air dryer. (see below) The units are shipped completely assembled and ready to go.
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