Aircel AEHD Series

Dimensions & Specifications

Search below based on your specific needs and click on a model to order, view pricing, or download product information. If you have questions on how to properly select a compressed air dryer, contact our knowledgeable customer service toll-free: 866-650-1937 or send us an email request. Pricing includes mounted prefilter and afterfilter, ASME code stamped filter housing, differential pressure gauge, automatic drain valve and initial filter element.

¹Capacity based on -40°F pdp, 100 psig operating pressure, 100°F inlet temperature and 100°F ambient temperature according to CAGI ADF 200.
Ambient air temperature: 38-125°F; inlet air temperature: 40-110°F; operating pressure: 60-150 psig.
Standard electrical construction: NEMA 12 (dust proof)

If you have questions on how to properly select a compressed air dryer, contact our knowledgeable customer service toll-free: 866-650-1937 or send us an email request.

Use our Drying Sizing Tool below to find the dryer you need based on your system specifications.

How to Size a AEHD

To Size the Dryer Capacity for Actual Conditions

Adjusted Capacity = scfm x C1 x C2

To calculate the capacity of a given dryer based on non-standard operating conditions, multiply the standard capacity by the appropriate correction factor(s).

EXAMPLE: Dryer Model: AEHD-500
Standard Capacity: 500 scfm
Actual Operating Conditions: 80°F ambient temperature: C1 = 1.15
90 psig system pressure: C2 = 0.91
Adjusted Capacity = 500 scfm x 1.15 x 0.91 = 523 scfm

To Select the Dryer Model for Actual Conditions

Adjusted Capacity = scfm/C1/C2

To choose a dryer based on a given flow at non-standard operating conditions, divide the given flow by the appropriate correction factor(s).

EXAMPLE: Given Flow: 500 scfm
Actual Operating Conditions: 80°F ambient temperature: C1 = 1.15
130 psig system pressure: C2 = 1.27
Adjusted Capacity = 500 scfm / 1.15 / 1.27 = 342 scfm

Selected Dryer Model: AEHD-350

Capacity Correction Factors

The Compressed Air and Gas Institute (CAGI) has developed standards to protect users of compressed air & gas equipment ADF 200 is the current standard for desiccant compressed air dryers. ADF 200 specifies the dryers performance to be rated at -40°F pressure dew point, 100°F inlet temperature, 100°F ambient temperature, and 100 psig system pressure. To adjust the dryer capacity from these "CAGI conditions" to your specific application, please use the correction factors below for differing inlet air temperatures (C1) and system pressures (C2).

Heated Regenerative Desiccant Dryers

Regenerative compressed air dryers use desiccant to adsorb water vapor from the compressed airstream. In the twin tower design one tower dries the air from the compressor while the desiccant in the other tower is being regenerated to provide continuous operation. These dryers are typically referred to as "heatless" or "heated". Heatless dryers do not use any source of heat for regeneration other than the heat given off during the drying phase. This is known as the "Heat of Adsorption". Heated dryers, on the other hand, utilize an external heat source for regeneration and require little or no process air.

Reliability and Performance

The Aircel AEHD Series Dryers (150 - 3,000 scfm) utilize process air for regeneration of the desiccant bed similar to the heatless designs. However, this expanded process air is heated prior to entering the off-line bed, significantly reducing the required consumption and the cost of operation. Additionally process air is consumed during depressurization of the offline desiccant tower. In total these functions amount to an average process air use of 7% of the rated capacity of the dryer.

Standard Features:

• Pricing includes mounted prefilter and afterfilter, ASME code stamped filter housing, differential pressure gauge, automatic drain valve and initial filter element.
• Fail-safe design: failure of power and/or pilot air causes the purge exhaust valves to close.
• Automated dryer control sequencing using a highly reliable programmable logic control (PLC).
• Dryer operation and common alarms viewed on text display on enclosure door for each operation and troubleshooting.
• Reliable non-lubricated high-performance inlet and purge exhaust valves are: 316 stainless steel angle-body piston valves (150 to 500 scfm models).
• High temperature outlet check valves.
• Stainless steel body 3-way exhaust pilot solenoid valves.
• ASME code desiccant towers (6" vessels and larger).
• Repressurization valve and circuit for equal pressurization prior to switch over.
• Tower pressure gauges.
• Tower safety valves for over pressure protection.
• Removable, stainless steel desiccant bed support screens.
• Low watt density (15-22 watt/in2) heater with Incoloy® sheath elements for long life and corrosion resistance.
• Separate safety heater back-up contactor (from the heater cycling contactor) will open with the heater high limit alarm and de-energize the heater in the event of a catastrophic failure.
• 1-1/2" thick fiberglass insulation with aluminum jacket on dryer vessels, hot air lines, and heater for optimum performance, protection, and durability.

Optional Features:

• NEMA 4 (dust & waterproof) electrical construction.
• NEMA 7 (explosion proof) electrical construction.
• -100°F pressure dew point.
• Failure to shift alarm.
• Remote start/stop
• Low ambient temperature package.
• Purge flow meter.
• Dew point monitor.
• Demand cycle control with dew point monitor.
• Pre-piped filters and by-pass valve packages.
• Visual moisture indicator.
• Steam heated models.

How The AEHD Series Works

Filtering and drying incoming air. Hot, saturated compressed air is filtered as it passes through our 0.01 micron high-efficiency coalescing prefilter (F1, recommended option) before entering the dryer. Compressed air continues through the inlet valve (V1), is dried in the desiccant tower (T1), and exits through an outlet valve (V5) and final particulate filter (F2, recommended option), while the other desiccant tower (T2) is being regenerated.

Desiccant regenerated in T2. A portion of the dried air is diverted through purge valve (P3) at near atmospheric pressure and heated by the electric heater (or optional steam heater) to 400°F before passing through regeneration valve (V4) and into the regeneration tower (T2). The heated air removes moisture vapor from the desiccant surface.

Dryer operation is performed automatically by a programmable logic controller (PLC). The standard drying and regeneration time cycle is 8 hours. While one tower is drying incoming compressed air for 4 hours, the other tower is regenerating for 3 hours (heating time), then cooling for 50 minutes, and finally repressurizing to the line pressure for 10 minutes before switching over to the other tower. Switching from one tower to the other is performed only when both desiccant towers are at line pressure to prevent line surge and to minimize desiccant abrasion.

Available Options

Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AEHD dryer or for customized options and quotes.

Replacement Parts & Service

eCompressedair has partnered with Aircel which gives our customers direct distributor discounted pricing and access to the entire Aircel product line.

Purchasing an Aircel dryer from eCompressedair gives you access to factory-direct replacement parts, kits and maintenance information for all Aircel dryers. Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AEHD dryer replacement parts, kits or maintenance information.

Aircel AEHD Externally Heated Regenerative Desiccant Dryer Series

Brochure (pdf)

Contact our customer service team by calling toll-free 866-650-1937 or email sales@ecompressedair.com for more information about the AEHD dryer or for customized options and quotes.