ESWB Closed Circuit Cooler
The ESWB is an induced draft, counterflow design closed circuit cooler with a CTI Certified capacity range of 583 to 7264 MBH (171 to 2129 kW). Standard construction includes the patented, high efficiency Sensi-Coil® Technology featuring CrossCool™ Internal Tube Enhancement , EVAPAK Fill and G-235 (Z725-Europe) galvanized steel casing and basin. Type 304 stainless steel construction is available for the basin, the redistribution basin, or the entire unit.
The ESWB stands apart as being the most energy efficient and the quietest axial fan closed circuit cooler on the market today. The ESWB is able to provide superior performance as a result of its full footprint patented Sensi-Coil® Technology. The Sensi-Coil® now features CrossCool™ Internal Tube Enhancement which increases the internal heat transfer coefficient of the coil and thus increases the cooling capacity of the unit.
The ESWB’s Cooling Technology Institute † certified performance, new owner oriented features and independent certification of the International Building Code (IBC) compliance reinforce the ESWB’s position as a premier cooler in the HVAC industry.
- Principle of Operation
- IBC Compliant
- Patented Sensi-Coil® Technology Featuring Cross-Cool Internal Tube Enhancement
- Evapak Fill
- Efficient Drift Eliminators
- Fast, On-Time Shipments
- Superior Air Inlet Louver and Screen Design
- Pressurized Water Distribution System
- Redistribution Basin
Principle of Operation
Evapco was the first to develop a closed circuit cooler with Patented Optimized Technology. The pump is energized, and water is circulated up to the water distribution system. This starts with the large orifice EvapJet nozzles evenly distributing water as a thin film over the extended fill surface for maximum cooling efficiency. The fan system operates simultaneously, moving large volumes of air through the unit in a direction opposite the falling water. The air and water contact directly across the fill surface whereupon a small portion of the spray water is evaporated. The warm and saturated air is then discharged from the unit dissipating heat to the atmosphere. The spray water exits the fill section as a cooled fluid where it is collected by the redistribution basin for even soaking of the full footprint coil. The hot process fluid enters the coil through the bottom coil connection(s). The heat load is rejected to the circulating water that cascades over the coil surface by means of sensible heat transfer.
What is IBC?
- The International Building Code requires that evaporative cooling equipment must meet the same seismic or wind load forces as the building to which they are attached.
How does it apply?
- Based on project zip code and site design factors, calculations are made to determine the equivalent seismic "g force" and wind load on the unit.
What does EVAPCO offer?
- Standard Structural Design
-Projects with ≤ 1.0g seismic or 60 psf wind loads
Sensi-Coil®, featuring CROSSCOOL™ tube enhancement, exclusive on the ESWB closed circuit cooler, features the maximum amount of Thermal-Pak elliptical tubes packed closely together in a coil arrangement designed with over 50% additional coil surface area.
Evapco’s coils are manufactured within the most stringent of quality control procedures. Each circuit consists of high quality steel tubing formed into a continuous serpentine circuit. Each circuit is then inspected and tested prior to being welded into a framed coil assembly. The coil assembly is then pneumatically tested at 400 psig under water to ensure its integrity. The entire coil assembly is then hot-dip galvanized for industrial strength corrosion protection.
TITAN COIL with XT construction is manufactured from type 304L Stainless Steel, the TITAN COIL is manufactured using Evapco’s patented elliptical tube Sensi-Coil® design upgraded to Xtra Tough construction featuring: Xtra Durability, Xtra Corrosion
Patented EVAPAK® Fill
The patented EVAPAK® fill is specially designed to induce highly turbulent mixing of the air and water for superior heat transfer. The fill-pack is constructed of polyvinyl chloride (PVC) sheets which are thermally formed into a cross flute design. The individual fill sheets are bonded together to form rigid fill blocks. The fill blocks are then stacked within the unit's protective casing. The structural strength of the assembled fill deck enables it to be used as a working platform. EVAPAK® fill is impervious to rot and decay, and is self-extinguishing with a flame spread rating of 5 per ASTM Standard E84.
Efficient Drift Eliminators
Fast, On-Time Shipments
Framed Water Sight Tight Air Inlet Louver
Evapco's innovative air inlet louvers are both water and sight tight to ensure that the water stays in and the sunlight stays out of the cold water basin. Using extensive computational fluid dynamics modeling, Evapco engineers developed a louver to improve “splash resistance” while maximizing airflow. The resulting design maximizes thermal performance while minimizing water loss. This sight tight design also inhibits algae growth more effectively than previous designs. Evapco’s louver design solves the problem of the circulating water and heat transfer surfaces being directly exposed to external contaminants and the harsh surroundings.
Water Distribution System
The redistribution basin ensures even water loading of the full footprint Sensi-Coil® The redistribution basin is enclosed and completely protected by the air inlet louvers. The louvers also function as effective debris screens which block sunlight and prevent debris from entering redistribution system. The redistribution basin is easily inspected with the removal of the framed air inlet louvers.
Designed for easy maintenance, the ESWB Closed Circuit Cooler leads the industry in service friendly features. The three most critical areas for closed circuit cooler maintenance are the basin, drive system, and coil. The ESWB basin section is designed to allow quick and easy access from outside the cooler. Just like the basin, all service to the drive system can be safely performed from the side of the cooler, and EVAPCO's Power-Band drive system is the easiest belt drive system to maintain in the industry! The exclusive Thermal-Pak® Coil is designed for trouble-free maintenance and long life straight from the factory.
- Easy Access
- Clean Pan Basin Design
- Stainless Steel Strainers
- Swing-Out Motor Base (Video)
- Easy, Removable Air Inlet Louvers with Quick Release Fasteners (video)
- 12' (3,7 m) Wide Models Motor Mount, Power Band Belt Adjustment and Bearing Lubrication
- 8-1/2' (2,6 m) Wide Models Motor Mount, Power Band Belt Adjustment and Bearing Lubrication
The cold water basin section is easily accessible from ground level. The basin is provided with solid access panels which are designed to protect the basin water and heat transfer coil from direct exposure to sunlight and debris. The access panels are light-weight and have handles for easy removal. With the access panels removed, a service mechanic has complete access to the basin floor, heat transfer coil, float assembly and pump strainer.
Clean Pan Basin Design
The basin of the ESWB is sloped toward a depressed area where the drain is located. With the "Clean Pan" design, it is easy for a service mechanic to flush the pan without getting wet feet. Other fluid cooler designs may necessitate getting inside of the unit for complete cleaning.
Stainless Steel Strainers
The EVAPCO standard for many years, the stainless steel strainer is one component of the closed circuit cooler subject to excessive wear and corrosion. With stainless steel construction, this component will last the life of the cooler.
Easy, Removable Air Inlet Louvers with Quick Release Fasteners
The ESWB features a Quick Release Fastener design consisting of (2) two large thumbscrews and a latch system. By loosening the thumbscrews, the latch pulls up and out of the louver frame, allowing the louver to be removed while the latch and thumbscrews stay on the closed circuit cooler.
Belt Drive Units - 12' (3,7) Wide Models
The T.E.A.O. fan motor is located inside the fan casing on the large ESWB Closed Circuit Cooler, and is mounted on a rugged heavy duty motor base. The motor base is designed to swing completely to the outside of the unit through a very large, hinged (14 square feet) (1,3 square meters) access door greatly simplifying motor maintenance.
The unique swinging motor mount designed for these models features easy belt adjustment from the exterior of the unit. The T.E.A.O. fan motor is mounted on an adjustable base which is supported by two heavy duty galvanized steel pipes. The belt is adjusted by tightening an all-thread which runs through the motor base.
The innovative motor base features a unique locking mechanism for a positive belt adjustment and is also used to adjust the belt tension if a wrench is not available.
Bearing lubrication fittings are extended to the side of the unit inside the access door to allow easy application of the bearing lubricant. This external location allows for easy servicing of the bearings and is another important advantage of EVAPCO equipment.
To facilitate motor removal, an optional motor davit is available.
Go to Optional Equipment for details.
Belt Drive Units - 8 1/2' (2,6) Wide Models
The fan motor and drive assembly are designed to allow easy servicing of the motor and adjustment of the belt tension from the exterior of the unit. The T.E.F.C fan motor is mounted on the outside on these models and is protected from the weather by a cover which swings away for maintenance.
A large hinged access door is located on the side of the unit for easy access to the fan drive system. The belt can be adjusted by tightening the J-Bolts on the motor base and the tension can be checked easily through the access door, all while standing at the side of the unit. The bearings can
also be lubricated from the side of the unit. The bearing lubrication lines have been extended to the exterior casing and are located by the access door, thus making bearing lubrication easy.
Sloped access ladders and working platforms are available as an option to facilitate maintenance.
Go to Optional Equipment for details.
The ESWB Closed Circuit Cooler is an Advanced Technology, induced draft counterflow design closed circuit cooler featuring EVAPCO's patented Sensi-Coil® technology - the most efficient in the industry. The counterflow design provides the ESWB Closed Circuit Cooler with inherently better operational and maintenance features. The ESWB is now standard with CTI Certified Performance including the Super Low Sound Fan option. These features are described below.
All ESWB Closed Circuit Cooler models utilize heavy duty totally enclosed (T.E.F.C. or T.E.A.O) fan motors designed specifically for closed circuit cooler applications. In addition to the standard motors offered on each cooler, EVAPCO offers many optional motors to meet your specific needs, including:
- Premium Efficiency Motors
- Multi-Speed Motors
- Inverter-Duty Motors
for VFD Applications 8.5' (2,6 m) wide ESWB models feature T.E.F.C. motors are located on the outside of the unit, protected by a hinged, swing away cover. 12' (3,7 m) wide ESWB models have T.E.A.O. motors located inside the fan section on a heavy duty motor base which swings to the outside for repair or removal.
(5) Five Year Warranty
EVAPCO provides a standard (5) five year motor and drive warranty on all direct drive Power-Band belt drive and optional gear drive ESWB Closed Circuit Coolers. This unique warranty is designed to offer the end user optimum protection against fan drive and motor failure. It is a comprehensive plan which includes the fan, fan shaft, belts, sheaves, fan bearings, gear box, flexible coupling, driveshaft and the motor.
Fan Shaft Bearings
The fan shaft bearings on the ESWB Closed Circuit Cooler are specially selected to provide long life, minimizing costly downtime. They are rated for an L-10 life of 75,000 to 135,000 hours, making them the heaviest duty pillow block bearing in the industry used for Closed Circuit Cooler duty.
Drive System Sheaves
Drive system sheaves located in the warm, moist atmosphere inside the closed circuit cooler are constructed of an aluminum alloy. Those located externally are protected by a hinged cover.
Power-Band Belt Drive
The Power-Band drive is a solid-back multigroove belt system that has high lateral rigidity. The belt is designed for closed circuit cooler service, and is constructed of neoprene with polyester cords. The drive belt is sized for 150 percent of the motor nameplate horsepower ensuring long and trouble free operation.
The standard design of the EVAPCO ESWB provides the customer with the most efficient and easiest Closed Circuit Cooler to maintain in the industry. There are additional options which can make maintenance easier, extend the life, or enhance the performance capabilities of the Closed Circuit Cooler. These options are listed below.
- 304 Stainless Steel Coil
- Super Low Sound Fan
- Sloped Access Ladders
- Stainless Steel Water Touch Basin
- External Platforms, Ladders & Motor Davits
- Electric Water Level Control
- Electric Heaters
Evapco Manufactured 304 Stainless Steel Coils
The Evapco manufactured Stainless Steel Coil is an elliptical tube, continuous return bend, 304 stainless steel coil. It is available in both the Patented Thermal Pak Coil design used on AT, UB, LR and LS coolers and condensers and in the patent pending SensiCoil design used in the ESWB. This option has superior corrosion resistance for Open Systems and Hostile Environments and is available with the Standard Evapco Lead Time! For more detail on the corrosion resistant properties of 304 stainless steel, see Evapco's Maintenance Instruction Bulletin, 112AA. The Evapco 304 SST coil option can be manufactured as an ASME coil and is CTI certified on the ESWA and ATWB closed circuit cooler.
Super Low Sound Fan
9 - 15 db(A) Reduction versus Standard Fan!
The Super Low Sound Fan offered by EVAPCO utilizes an extremely wide chord blade design available for sound sensitive applications where the lowest sound levels are desired. The fan is one-piece molded heavy duty FRP construction utilizing a forward swept blade design. The Super Low Sound Fan is capable of reducing the unit sound pressure levels 9dB(A) to 15dB(A), depending upon specific unit selection and measurement location. The fans are high efficiency axial propeller type and operate with no loss of thermal performance.
The Super Low Sound Fan is available on all 8.5ft and 12ft (2.4m and 3.6m Europe) wide ESWB Closed Circuit Coolers.
View Product Video
Super Low Sound Fan
Sloped Access Ladders
A sloped access ladder is available for 8.5' and 12', (2,6 and 3,7m) wide ESWB models. The EVAPCO designed access ladder features a sloped "ships type" ladder arrangement which provides fast and easy access to the water distribution system and drive components as well as to the redistribution basin. A grab bar is attached to the sloped ladder for safe and easy ascent and descent. There is no need for safety cages or railings with this design. The ladder(s) will ship loose and must be field mounted. The sloped ladder meets all applicable OSHA requirements.
Stainless Steel Water Touch Basin
The ESWB Closed Circuit Cooler has a modular design which allows specific areas to be enhanced for increased corrosion protection. The basin area of the cooler experiences turbulent mixing of air and water, in addition to silt build-up. In conjunction with the EVAPCOAT Corrosion Protection System, EVAPCO offers an optional Stainless Steel Water Touch Basin. This option provides Type 304 or Type 316 stainless steel for the entire basin area including the support columns of the closed circuit cooler and the louver frames.
The basin section provides the structural support for the unit and is a critical part of the closed circuit cooler. The Stainless Steel Water Touch Basin provides maximum corrosion protection.
External Platforms, Ladders & Motor Davits
External platforms provide a sturdy base for access to the drive components, water distribution and drift eliminators. Constructed from heavy gauge galvanized steel, the platform mounts easily to the unit and requires no external support. The platform option includes a vertical aluminum ladder and meets all applicable OSHA requirements. A safety cage for the ladder is also available if required for the installation. The platform option also includes a vertical aluminum ladder to inspect the redistribution basin.
Electric Water Level Control
EVAPCO closed circuit coolers are available with an optional electric water level control system in place of the standard mechanical makeup valve and float assembly. This package provides very accurate control for the basin water level and does not require field adjustment, even under varying operating conditions.
The control was designed by EVAPCO and is manufactured exclusively for EVAPCO. It consists of multiple heavy duty stainless steel electrodes. These electrodes are mounted external to the unit in a vertical stand pipe. For winter operation, the stand pipe must be wrapped with electric heating cable and insulated to protect it from freezing.
The weather protected slow closing solenoid valve(s) for the makeup water connection is factory supplied and is ready for piping to a water supply with a pressure between 25 and 50 psig (138 kPa and 345 kPa).
Electric immersion heaters are available as an option and are located in the basin of the cooler They are sized to maintain a +40°F (4.4°C) pan water temperature at 0°F (-18°C) ambient with the fans off *. They are furnished with a combination thermostat/low water protection device to cycle the heater on when required and to prevent the heater elements from energizing unless they are completely submerged. All components are enclosed in rugged, weather proof enclosures for outdoor use. Heater control packages that include contactor, transformer or disconnects are available.
(*) - Electric heater selection based on 0°F (-18° C) ambient temperature. For alternate low ambient heater selections consult the factory
- Design Features
- Maintenance Features
- Drive Systems
- Optional Equipment
- Unit Specifications
- Thermal Performance
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