eco-ATWB-H Closed Circuit Cooler

EVAPCO eco-ATWB-H Closed Circuit Cooler

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

Available with a factory-mounted water treatment.

Highest ambient 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

EVAPCO ECO-ATWB-H Closed Circuit Cooler – Principle of Operation

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.

Product Features

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

Equipment Upgrades

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
Pulse-Pure CHEMICAL-FREE 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