Product Images
Double Stack Adiabatic Cooler

The eco-Air Double Stack Adiabatic Fluid Cooler is a high capacity adiabatic cooler designed to maximize heat rejection capability for a given footprint. The Double Stack units will help reduce total quantity of units required and installed footprint to optimize the layout on large projects where multiple smaller air-cooled units may be required. The adiabatic pre-cooling system with 2-stage operation as standard minimizes water usage and can provide leaving water temperatures comparable to evaporative units.

Unlike other dry coolers currently on the market, the EVAPCO eco-Air Series units are 100% fully rated for dry performance. Every eco-Air unit is tested per CTI ATC-105DS and comes with EVAPCO’s exclusive 100% thermal performance guarantee, ensuring peace of mind in selecting the ideal cooling solution for your needs.

To learn more about adiabatic pre-cooling, click here.
  • Dramatically reduced water consumption
  • Ranging in nominal heat rejection capacity from 2,750 MBH to 8,440 MBH
  • Type 304L stainless steel tubing as standard
  • Heavy gauge aluminum fins as standard
  • Simplified maintenance
  • NEMA Belt drive

Double Stack Adiabatic Principle of OperationHot process fluid enters the inlet header connection, shown in red. Heat from the process fluid dissipates through the coil tubes surface and out to the fins. The adiabatic system involves fully wetting a fibrous pad located in front of the coil. Ambient air is drawn through the adiabatic pre-cooling pad by the fans located on top of the unit. The air is humidified as it passes through the adiabatic pad, decreasing the ambient dry bulb temperature within a few degrees of the ambient wet bulb temperature. This new air temperature is referred to as the depressed dry bulb. This pre-cooled air is then drawn through the tube and fin surface, offering a substantial increase in heat rejection capability. Heat from the process fluid transfers to the air and discharged to the atmosphere. Cool process fluid exits the unit through the connections shown in blue.

Adiabatic Pre-Cooling System
  • Type 304L SST frames, water distribution trays and drain channels
  • High efficiency adiabatic pads, tested & rated in EVAPCO's R&D labs
  • 2-stage water distribution system to further reduce water usage
  • Components include water pressure regulator, strainer, solenoid valves, pressure gauge and drain valve
  • Consult EVAPCO’s IOM for water quality recommendations.  Most locations in North America do not require water treatment for adiabatic pre-cooling.
  • Casing and unit structure including vertical support members and anchoring channels constructed with Type 304 stainless steel as standard
  • G-235 construction optional
  • Type 316 stainless steel construction optional
  • Constructed with Type 304L stainless steel tubing as standard for superior corrosion resistance and longevity
  • Meets ASME B31.5 piping code
  • Type 316 stainless steel coil construction optional
  • Epoxy coating on fins optional

The eco-Air Double Stack Adiabatic Coolers are provided in Belt Drive configuration with NEMA fan motors.  The motors on the eco-Air Series are pre-wired at the factory to UL standards, reducing costs associated with field wiring. 

NEMA Motors
  • Belt drive – simple, reliable, easy to replace
  • Zero maintenance sealed bearings
  • VFD ready
  • Severe duty

As standard, all motors on the eco-Air Double Stack V Series Coolers are wired to Individual Fused Disconnects in UL Type 4 enclosures.  Vibration switches, when selected, will be wired to a Low Voltage Terminal Box.  Solenoid valves for the adiabatic pre-cooling system will be wired to the Low Voltage Terminal Box.

  • DPDT vibration switches
  • Individual fused disconnects (UL Type 4)
  • Low voltage terminal box
Maintenance Access
  • Optional external service platform
  • Large-hinged door for drive system access
  • Full length internal drive access platform
Document Categories
Name File Size Type Language
Closed Circuit Cooler Brochure 15.81 MB English
EAW Certified Performance Tables 4.77 MB Thermal Performance English
eco-Air Equipment Layout Manual 13.67 MB Layout English
eco-Air Operation & Maintenance Instructions 8.23 MB O & M English
eco-Air Rigging & Assembly 12.97 MB Rigging English
eco-Air Series Double Stack Dry & Adiabatic Coolers 7.43 MB Catalog English
EVAPCO Controller Quick Start Guide 2.43 MB English
EVAPCO Controller User's Manual 5.23 MB English
EVAPCO Controller User's Manual - EC Motor Edition 5.2 MB English
EVAPCO Controller User's Manual - NEMA Motor Edition 4.27 MB English
Product Model filter

Drawing Types