eco-ATWB-H Hybrid

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eco-ATWB-H Hybrid

Dramatically reduced water consumption

Thanks to EVAPCO’s cutting edge finned coil technology, the eco-Hybrid is the ultimate solution for both HVAC and large tonnage industrial process installations seeking the highest dry bulb switchover temperatures, reduced water usage, high peak-load output, and plume abatement. Available with a sophisticated SAGE control system and factory-mounted water treatment.

  • Highest dry bulb switchover temperature in the industry
  • Dry coil piped in series with evaporative coil to dramatically reduce water consumption, ALWAYS, even in evaporative mode
  • Plume reduction in evaporative mode, plume elimination in dry mode
  • Ranging in capacity from 1,046 - 20,076 MBH
  • IBC Compliant – Independently certified to withstand seismic and wind load forces at ALL building locations in North America
  • Independently certified by the Cooling Technology Institute
Dry Mode
  • The unit maintains dry mode operation until the temperature set point can no longer be met
  • While in dry mode, no water is used, thus plume is eliminated
  • Dry mode operation can save thousands in water usage and sewage costs annually


In dry mode, process fluid enters the ARID fin Pak® coil through the top coil connections, the fan activates, drawing air upward through the louvers and across the coils. As the air passes over the coil, a portion of the load is dissipated to the atmosphere through the tube walls and fins through sensible heat transfer. The warm process fluid exits the ARID fin Pak coil, entering the Ellipti-fin coil through the factory installed piping; the remaining load dissipates through the tube and extended surface fins of the Ellipti-fin coil through sensible heat transfer.


Evaporative Mode
  • Once the temperature set point can no longer be met, the unit switches to evaporative mode
  • The evaporative mode utilizes evaporative and dry cooling simultaneously to significantly increase cooling capacity
  • The ARID fin Pak coil reduces water loss and plume by heating saturated discharge air as it leaves the unit


Process fluid enters the ARID fin Pak coil through the top coil connections, the fan and pump motors activate. As the air passes over the ARID fin Pak coil, a portion of the load dissipates to the atmosphere through the tube walls and fins through sensible heat transfer. The warm process fluid transfers to the Ellipti-fin® coil, where the spray system cascades water over the tubes of the Ellipti-fin coil, transferring heat to the water. Air is drawn upward and over the coils by the axial fan, agitating the falling water and increasing the transfer of heat. A small amount of the recirculating water evaporates due to latent heat transfer through the tube and fin walls of the Ellipti-fin coil. 

Ellipti-fin Cooling Coil
  • The most effective coil design in the industry
  • 25% average increase in efficiency
  • Elliptical fins increase surface area and heat transfer
  • Hot-dip galvanized for increased corrosion resistance
ARID fin Pak™ Dry Cooling Coil
  • 304L stainless steel construction
  • Aluminum manganese alloy fins for superior corrosion resistance
  • Rejects approximately 30% of heat load, on average
  • Significant plume abatement in evaporative mode
  • Plume elimination in dry mode
Drift Eliminators
  • Limits the drift rate to less than 0.001% of the recirculating water rate
  • Limit the potential of spreading Legionella
  • Constructed of an inert polyvinyl chloride (PVC)
Superior Air Inlet Louver and Screen Design
  • Constructed of an inert polyvinyl chloride (PVC)
  • Two pass design that minimizes splash-out and the potential for algae formation inside the tower
  • Framed in steel in easily removable sections
Pressurized Water Distribution System

EVAPCO's Zero Maintenance ZMII® spray nozzle remains clog free while providing even and constant water distribution, providing the industry's best performing non-corrosive, maintenance-free water distribution system.

  • ZMII spray nozzles have a 1-1/4" diameter opening and a 1-1/4" splash plate clearance
  • Mounted in corrosion-free PVC water distribution pipes that have threaded end caps
  • Provides unequaled coil coverage and scale prevention
Stainless Steel Water Touch Basin
  • Available in Type 304 or Type 316 Stainless Steel
  • Includes the entire basin area including the support columns and the louver frames
  • Welded basin seams for leak-free operation
Stainless Steel Casing & Fan Section
  • Available in Type 304 or Type 316 Stainless Steel
  • Includes the entire upper section including fan guard
Sound Sensitive Installations

Available with multiple equipment options to reduce the overall sound generated from the side or top of the unit.

  • Super Low Sound Fan
  • Low Sound Fan
  • Water Silencers
  • Discharge Attenuation
  • Offset Sound Attenuation Walls
FACTORY-MOUNTED Water Treatment Systems

Available with FACTORY-MOUNTED water treatment systems, providing environmentally sensitive alternatives for treating water in evaporative cooled equipment.

  • Smart-Shield solid chemical water treatment system
Maintenance Accessories

Available with multiple equipment options to aid in the maintenance of the closed circuit cooler.

  • External service platform
  • Basin level platform
  • Sloped ladder
  • Hinged louver access door
  • Motor davit with base
Document Categories
Name File Size Type Language
Eco Coolers: eco-ATWB-H Bulletin 27.08 MB Catalog English
Eco-ATWB-H Unit Specifications 39.33 KB Specification Sheet English
Equipment Layout Manual for Cooling Towers, Evaporative Condensers & Closed Circuit Coolers 7.44 MB Layout English
HVAC Products: Features & Applications 12.74 MB Catalog English
Low Sound Solutions Brochure 1.13 MB Catalog English
Maintenance Check List 56.28 KB O & M English
Operation and Maintenance Instructions 19.28 MB O & M English
Rigging and Assembly for the ATC-DC and the eco-ATWB-H 2.96 MB Rigging English
运行维护手册 32.47 MB 运行维护手册 Chinese