EVAPCO PRODUCTS ARE MANUFACTURED...

World Headquarters/Research and Development Center

EVAPCO Facilities

WRD

©2010 EVAPCO, Inc.

EVAPCO PRODUCTS ARE MANUFACTURED WORLDWIDE

Member MCAAMechanical Contractors Association of America

EVAPCO...SPECIALISTS IN HEAT TRANSFERPRODUCTS AND SERVICES.

EVAPCO, Inc. — World Headquarters & Research/Development Center

EVAPCO, Inc.World HeadquartersP.O. Box 1300Westminster, MD 21158 USAPhone: 410-756-2600Fax: 410-756-6450E-mail: [email protected]

EVAPCO Asia/Pacific

EVAPCO Asia/Pacific Headquarters1159 Luoning Rd. Baoshan Industrial ZoneShanghai, P. R. China, Postal Code: 200949Phone: (86) 21-6687-7786Fax: (86) 21-6687-7008E-mail: [email protected]

EVAPCO Europe

EVAPCO Europe, N.V.European HeadquartersIndustrieterrein Oost 40103700 Tongeren, BelgiumPhone: (32) 12-395029Fax: (32) 12-238527E-mail: [email protected]

EVAPCO East5151 Allendale LaneTaneytown, MD 21787 USAPhone: 410-756-2600Fax: 410-756-6450E-mail: [email protected]

EVAPCO Midwest1723 York RoadGreenup, IL 62428 USAPhone: 217-923-3431Fax: 217-923-3300E-mail: [email protected]

EVAPCO West1900 West Almond AvenueMadera, CA 93637 USAPhone: 559-673-2207Fax: 559-673-2378E-mail: [email protected]

EVAPCO Iowa925 Quality DriveLake View, IA 51450 USAPhone: 712-657-3223Fax: 712-657-3226

EVAPCO IowaSales & Engineering1234 Brady BoulevardOwatonna, MN 55060 USAPhone: 507-446-8005Fax: 507-446-8239E-mail: [email protected]

Refrigeration Valves & Systems CorporationA wholly owned subsidiary of EVAPCO, Inc.1520 Crosswind Dr.Bryan, TX 77808 USAPhone: 979-778-0095Fax: 979-778-0030E-mail: [email protected]

McCormack Coil Company, Inc.A wholly owned subsidiary of EVAPCO, Inc.P.O. Box 17276333 S.W. Lakeview BoulevardLake Oswego, OR 97035 USAPhone: 503-639-2137Fax: 503-639-1800E-mail: [email protected]

EvapTech, Inc.A wholly owned subsidiary of EVAPCO, Inc.8331 Nieman RoadLenexa, KS 66214 USAPhone: 913-322-5165Fax: 913-322-5166E-mail: [email protected]

Tower Components, Inc.A wholly owned subsidiary of EVAPCO, Inc.5960 US HWY 64ERamseur, NC 27316Phone: 336-824-2102Fax: 336-824-2190E-mail: [email protected]

EVAPCO Newton701 East Jourdan StreetNewton, IL 62448 USAPhone: 618-783-3433Fax: 618-783-3499E-mail: [email protected]

EVAPCO Europe, S.r.l.Via Ciro Menotti 10I-20017 Passirana di RhoMilan, ItalyPhone: (39) 02-939-9041Fax: (39) 02-935-00840E-mail: [email protected] Europe, S.r.l.Via Dosso 223020 Piateda Sondrio, ItalyEVAPCO Europe, GmbHBovert 22D-40670 Meerbusch, GermanyPhone: (49) 2159-69560Fax: (49) 2159-695611E-mail: [email protected] coil a/sA subsidiary of EVAPCO, Inc.Knøsgårdvej 115DK-9440 Aabybro DenmarkPhone: (45) 9824 4999Fax: (45) 9824 4990E-mail: [email protected] S.A. (Pty.) Ltd.A licensed manufacturer of EVAPCO, Inc.18 Quality RoadIsando 1600Republic of South AfricaPhone: (27) 11 392-6630Fax: (27) 11-392-6615E-mail: [email protected] Egypt Engineering Industries Co.5 El Nasr Road, Nasr City, Cairo, EgyptPhone: +2 (02) 24022866/+2 (02) 24044997/8Fax: +2 (02) 24044667/8Mobile: +2 (012) 3917979E-mail: [email protected] / [email protected] / [email protected]: www.Tibagroup.me

Evapco (Shanghai) Refrigeration Equipment Co., Ltd.1159 Louning Rd., Baoshan Industrial ZoneShanghai, P.R. China, Postal Code: 200949Phone: (86) 21-6687-7786Fax: (86) 21-6687-7008E-mail: [email protected]

Beijing EVAPCO Refrigeration Equipment Co., Ltd.Yan Qi Industrial Development DistrictHuai Rou County Beijing, P.R. China, Postal Code: 101407Phone: (86) 10 6166-7238Fax: (86) 10 6166-7395E-mail: [email protected]

Evapco Australia (Pty.) Ltd.A licensed manufacturer of EVAPCO, Inc.34-42 Melbourne St.P.O. Box 436Riverstone, N.S.W. Australia 2765Phone: (61) 29 627-3322Fax: (61) 29 627-1715E-mail: [email protected]

EvapTech Asia Pacific Sdn. BhdA wholly owned subsidiary of EvapTech, Inc.IOI Business Park, 2/F Unit 21Persiaran Puchong Jaya SelatanBandar Puchong Jaya,47170 Puchong, Selangor, MalaysiaPhone: (60-3) 8070 7255Fax: (60-3) 8070 5731E-mail: [email protected]

EVAPCO North America

EVAPCO, Inc. • P.O. Box 1300 • Westminster, MD 21158 USAPHONE: 410-756-2600 • FAX: 410-756-6450 • E-MAIL: [email protected]

Visit EVAPCO’s Website at: http://www.evapco.com

1500/0910/YGS Bulletin 230

APPL ICAT IONS

79

NOTES

2 ©2010 EVAPCO, Inc.

Since its founding in 1976, EVAPCO,Incorporated has become an industry leader

in the engineering and manufacturing of qualityheat transfer products around the world.EVAPCO’s mission is to provide first class serviceand quality products for the following markets:

� Industrial Refrigeration � Commercial HVAC � Industrial Process � Power

EVAPCO’s powerful combination of financialstrength and technical expertise has establishedthe company as a recognized manufacturer ofmarket-leading products on a worldwide basis.EVAPCO is also recognized for the superiortechnology of their environmentally friendlyproduct innovations in sound reduction andwater management.

EVAPCO is an employee owned company with astrong emphasis on research & development andmodern manufacturing plants. EVAPCO hasearned a reputation for technological innovationand superior product quality by featuringproducts that are designed to offer theseoperating advantages:

� Higher System Efficiency � Environmentally Friendly � Lower Annual Operating Costs � Reliable, Simple Operation and Maintenance

With an ongoing commitment to Research &Development programs, EVAPCO provides themost advanced products in the industry–Technology for the Future, Available Today!

EVAPCO products are manufactured in 17locations in 8 countries around the world andsupplied through a sales network consisting ofover 170 offices.

CTI Certified†

Patent #: 7,704,364

Optional Pulse~Pure®

Water Treatment System• Control bacteria to levels well below traditional

chemical water treatment

• Control the formation of mineral scale

• Save water by operating at higher cycles ofconcentration

• Yield corrosion rates equivalent to chemical water treatment

Louver Access Door• Louver access door is standard on models

with 5 and 6 ft. louver sizes

• Hinged access panel with quick releasemechanism

• Allows easy access to perform routinemaintenance and inspection of the makeupassembly, strainer screen and basin

Featuring

NEW!Ellipti-finFeaturing Elliptical Spiral Fin Coil Technology

Introducing the Most Efficient Closed Circuit Cooler Coil in the HVAC industry! The Ellipti-fin provides:• Patent Pending finned Thermal-Pak elliptical tube design with ALL

coil rows finned.

• Lower airflow resistance than typical finned round tubes• Increased Evaporative and Dry Cooling efficiency

Most AccessibleBasin• Access from all four

sides

• Large open areasimplifiesmaintenance

• Basin may beinspected withpumps running

WST II Air Inlet Louvers (Water and Sight Tight)• Easily removable for access

• Improved design to keep sunlight out–preventing biological growth

• Keeps water in while keeping dirt anddebris out

(Patent Pending)

Efficient Drift Eliminators• Advanced design removes

mist from the leavingairstream

• Made from corrosionresistant PVC for long life

(U.S. Patent No. 6315804)

PVC Spray Distribution Header with ZMII Nozzles• Nozzles are threaded into

header at proper orientation

• Large orifice fixed positionnozzles prevent clogging

• Threaded end caps for ease of cleaning

Design and Construction FeaturesThe New eco-ATW line of Closed Circuit Coolers has been specifically designed to dramatically increaseboth the evaporative (latent) and dry (sensible) modes of cooling. With this new revolutionary design, theEVAPCO eco-ATW will also save water and energy by increasing the unit’s efficiency in both theevaporative and dry cooling modes of operation. The eco-ATW utilizes the EVAPCO Ellipti-fin coil whichfeatures elliptical spiral fin technology to maximize the surface area available for heat transfer. The

eco-ATW is the ideal solution for: Lower Energy Costs, ReducingWater Consumption, Higher Dry Bulb Switchover, Super Low SoundLevels. This new product is designed with IBC Compliantconstruction and CTI Certified Performance.

NEW & Improved!

Easy Field Assembly• A new field assembly seam design

which ensures easier assembly andfewer field seam leaks

• Self-guiding channels guide the coilcasing section into position improvingthe quality of the field seam

• Eliminated up to 66% of fasteners

(Patent Pending)

Super Low Sound Fan (Optional)• Extremely wide sloped fan blades

for sound sensitive applications.

• One piece molded heavy dutyconstruction.

• 9-15 dB(A) sound reduction.

† Mark owned by the Cooling Technology Institute

†

Optional

Water and Energy Conservation Control System The best way to properly control and operate the eco-ATWClosed Circuit Cooler is with the optional Sage2 ® Water andEnergy Conservation Control System. The Sage2 ® is designed tooptimally control the fan motor(s) and the pump motor(s) of theunit. The Sage2 ® will efficiently reject the building load using theminimal amount of water and energy.

3

DESIGN FEATURES

4

Principles of OperationEvaporative Mode (Latent Heat Transfer)In the evaporative mode, the process fluid enters the coolerthrough the top coil connection and circulates through thefinned coils. With the pump and fan energized, the heat fromthe process fluid is transferred through the tube wall and fins tothe water cascading downward over the coils whilesimultaneously air is drawn upward over the coil opposite thewater flow. A small portion of the water is evaporated todissipate the heat to the atmosphere in a latent heat transfer.This mode of operation provides fan energy savings due toenhanced evaporative performance and lower leaving watertemperatures by utilizing evaporative cooling.

Dry Mode (Sensible Heat Transfer)In the dry mode, the recirculating spray pump is deenergized(Fan on, Pump off). The process fluid enters the eco-ATW coolerthrough the top coil connection and circulates through thefinned coil with the fan energized. Heat from the process fluid isdissipated to the atmosphere by sensible heat transfer throughthe tube wall and fins to the air passing over the coils. The coilsare finned to promote optimal airflow over the coil and tomaximize heat transfer area. Air is drawn over the finned coil bythe fan drive system. The process fluid then returns to the heatsource via the bottom coil connection. This mode of operationeliminates water consumption!

Maintenance Free ZMII® Spray NozzleWater Distribution SystemEVAPCO’S Zero Maintenance ZMII® SprayNozzle remains clog-free while providingeven and constant water distribution forreliable, scale-free evaporative cooling underall operating conditions.

The heavy duty nylon ZMII® Spray nozzleshave a 1-5/16" diameter opening and a 1-1/2" splash plate clearance. Furthermore,the fixed position ZMII® nozzles aremounted in corrosion-free PVC waterdistribution pipes that have threaded endcaps. Together, these elements combine toprovide unequaled coil coverage and scale prevention, and make the industry’s best performing non-corrosive,maintenance-free water distribution system.

Cooling CoilThe new eco-ATW Closed Circuit Cooler utilizes Evapco's patentpending Ellipti-fin coil design which assures even greateroperating efficiency. The elliptical tube design allows for closertube spacing, resulting in greater surface area per plan areathan round-tube coil designs. In addition, the revolutionaryEllipti-fin design utilizes elliptical spiral fin coil technology andhas lower resistance to airflow than typical finned coil designs.This permits greater water loading, making the new Ellipti-fincoil the most efficient coil design available on the market.

The coils are manufactured from high quality steel tubingfollowing the most stringent quality control procedures. Each circuit is inspected to ensure the material quality andthen tested before being assembled into a coil. Finally, theassembled coil is pneumatically tested at 400 psig underwater to ensure it is leak free.

To protect the coil against corrosion, it is placed in a heavy steelframe and then the entire assembly is dipped in molten zinc(hot-dip galvanized) at a temperature of approximately 800°F.

Note: Closed circuit coolers should only be used on sealed,pressurized systems. Continual aeration of the water in anopen system can cause corrosion inside the tubes of the coolerleading to premature failure.

ZMII® Nozzle

Thermal-Pak® Coil by EVAPCO

Round Tube Coil by Others

Efficient Drift EliminatorsThe eco-ATW is equipped with an efficient drift eliminatorsystem that effectively reduces entrained water dropletsfrom the air discharge to less than 0.001% of the spray waterflow rate.

The eliminators are constructed of non-corrosive PVC with amulti-pass design for maximum drift reduction. They areassembled in modular sections for easy removal and access tothe water distribution system.

In addition to reducing drift, the eliminators also function aseffective debris screens which protect the spray system fromsunlight and debris.

Belt Drive Units - 3', 4' and 17' Wide ModelsThe fan motor and drive assembly on these units aredesigned to allow easy servicing of the motor andadjustment of the belt tension from the exterior of the unit.A T.E.F.C. fan motor is mounted on the outside of thesemodels. A protective cover swings away to allow servicingand belt adjustment.

Belt Drive Units - 20' & 24' Wide ModelsThe fan motor and drive assembly are designed to allow easyservicing of the motor and adjustment of the belt tensionfrom the exterior of the unit. The T.E.A.O. fan motor islocated inside the fan casing on a rugged heavy duty motorbase. The innovative motor base also features a uniquelocking mechanism for a positive adjustment.

The motor base isdesigned to swing outthrough a very large,14 square foot accessopening. This allowsfor easy servicing ofthe motor fromoutside of the unit.

Air Intake

Sunlight

Splashout

Debris

Sunlight

Splashout

Debris

External Motor Mount

Motor Base Assembly

Motor Access

Superior Air Inlet Louver and Screen Design – New & ImprovedEVAPCO’S WST II Inlet Louvers (patent pending) keep water inand sunlight out of induced draft products. The unique non-planar design is made from light-weight framed PVC sectionswhich have no loose hardware, enabling easy unit access.

Developed with computational fluid dynamics (CFD) software,the louver’s air channels are optimized to maintain fluiddynamic and thermodynamic efficiency and block all line-of-sight paths into the basin eliminating splash-out; even whenthe fans are off. Additionally, algae growth is minimized byblocking all sunlight.

The combination of easy access, no splash-out and minimizedalgae growth saves the end user money on maintenancehours, water consumption and water treatment costs.

DES IGN FEATURES

5

Patent #: 6,315,804

G16333Text.QXD:Layout 1 9/3/10 6:37 PM Page 5

SPECIF ICAT IONS

SECTION 23 65 00 – FACTORY-FABRICATED CLOSED CIRCUIT COOLERPART 1 – DESIGN CONDITIONSA. Furnish and install as shown on the plans on EVAPCO Model______ induced draft counterflow closed circuit cooler. Eachunit shall be CTI Certified (with water) and have the capacityto cool ______ GPM of ______ from ______°F to______ °F witha ______ °F entering wet bulb temperature and a dry bulbswitchover temperature of ______ °F (Dry Capacity not CTICertified).Optional: (If dry operating condition are different than thewet operating conditions)Each unit shall also cool ______ GPM of______ from______ °Fto______ °F with a ______ °F entering dry bulb temperature.

B. Controls optional with unit. See Controls Technical Specifications.PART 2 – GENERAL2.1 RELATED DOCUMENTSA. Drawings and general provisions of the Contract, includingGeneral and Supplementary Conditions and Division 1Specification Sections, apply to this section.

2.2 SUMMARY: A. This Section includes factory assembled and tested, closedcircuit, induced draft counterflow cooling tower (also knownas a closed circuit cooler).

2.3 SUBMITTALSA. General. Submit the following:1. Certified drawings of the closed circuit cooler, sound data,recommended steel support indicating weight loadings,wiring diagrams, installation instructions, operation andmaintenance instructions, and thermal performanceguarantee by the manufacturer.

2.4 QUALITY ASSURANCEA. Verification of Performance: 1. Test and certify closed circuit cooler thermal performanceaccording to CTI Standard 201.2.Test and certify closed circuit cooler sound performanceaccording to CTI ATC-128.

B. Meet or Exceed energy efficiency per ASHRAE 90.1.2.5 WARRANTYA. Motor/Drive System: Five (5) year comprehensive warrantyagainst materials and workmanship including motor, fan,bearings, mechanical support, sheaves, bushings and belt.

B. Unit: One (1) year from start-up, not to exceed eighteen (18)months from shipment on the unit.

PART 3 - PRODUCTS3.1 MANUFACTURERSA. Manufactures: Subject to compliance with requirements, provideclosed circuit coolers manufactured by one of the following:1. EVAPCO, Inc.2. Approved Substitute

3.2 MATERIALSA. Galvanized Sheet Steel casing and fan housing complyingwith ASTM A 653/A 653M and having G-235 designation.

B. Optional Type 304 and/or 316 Stainless Steel as specified.3.3 INDUCED-DRAFT, COUNTERFLOW CLOSED CIRCUIT COOLERSA. Description: Factory assembled and tested, induced draftcounterflow closed circuit cooler complete with coil, fan,louvers, accessories, and rigging supports.

B. Closed Circuit Cooler Characteristics and Capacities: Refer tothe Closed Circuit Cooler schedule.

C. Fan(s): 1. Type and Material: Axial propeller, individually adjustablewide chord blade extruded aluminum installed in a closely fittedcowl with venturi air inlet for maximum efficiency, covered witha heavy gauge hot dipped Galvanized Steel fan guard.2. Maximum sound pressure level of _____dB(A) measured at5 feet above the fan discharge during full speed operationin accordance with CTI Standard ATC-128.

D. Water Distribution System: Non-corrosive materials.1. Evenly distribute of water over coil with pressurized spraytree.a. Pipes: Schedule 40 PVC, Non-corrosive Materialsb. Nozzles: Non-clogging, nylon, threaded into branchpiping.

E. IBC Compliance: The unit structure shall be designed,analyzed, and constructed in accordance with the latestedition of the International Building Code (IBC) Regulationsfor seismic loads up to _____ g and wind loads up to __ psf.

F. Collection Basin Material: Galvanized Steel. Type 304/316Stainless Steel Optional:1. Removable stainless-steel strainer with openings smallerthan nozzle orifices.2. Joints: Bolted and sealed watertight or welded.3. Overflow, makeup and side drain connections4. Flume plate between cells (for multiple-cell units) orEqualizer connection (for multiple- closed circuit coolersystem).

G. Heat Transfer Coil: Each row of the heat exchanger coil shallbe provided with elliptical spiral fins to increase theevaporative and dry thermal performance of the unit as wellas lowering the air pressure drop. Cooling coil(s) shall be allprimed surface steel, encased in a steel framework and hot-dip galvanized after fabrication as a complete assembly. Thetubes shall be arranged in a self-spacing, staggered patternin the direction of airflow for maximum heat transferefficiency and minimum pressure drop. The coil(s) shall bepneumatically tested at 400 psig, under water.

H. Casing: Galvanized Steel. Type 304/316 Stainless SteelOptional:1. Casing panels shall totally encase the heat transfer coil.2. Fasteners: Corrosion resistance equal to or better thanmaterials being fastened.3. Joints: Sealed watertight.4. Welded Connections: Continuous and watertight

I. Drift Eliminators: PVC, for long life and durability resistant torot, decay and biological attack; formed, bonded togetherfor strength and durability in block format for easy removaland replacement; self extinguishing with flame spreadrating of 5 per ASTM E84-81a; 0.001% drift rate.

J. Air Inlet Louvers: Formed PVC; designed “Sight Tight” tocompletely block direct sunlight from entering and waterfrom splashing out of the closed circuit cooler.

K. Water Level Control: Brass mechanical makeup water valveand plastic float with an adjustable linkage.

L. Water Recirculation Pump: Close-coupled, centrifugal typewith mechanical seal. The pump motor shall be ESAcompliant, ____ horsepower totally enclosed for outdoorservice on ____ volts, ____ hertz, and ____ phase.

3.4 MOTORS AND DRIVESA. General requirements for motors are specified in Division 15Section “Motors”.

B. Enclosure Type: TEAO or TEFCC. Fan Motor Speed: Premium Efficient VFD Duty 1. Motors shall be provided with space heaters.

D. Drive: Power Band Belt designed for 150% of the motornameplate HP.1. Belt: Mutli-groove, solid back V-belt type neoprenereinforced with polyester cord. 2. Sheaves: Aluminum alloy if located inside the airstream.3. Bearings: Heavy duty, self-aligning pillow block bearingswith lubrication lines extended to side access door.Minimum L10 life for bearings shall be 75,000 hours. Provideextended grease lines and fittings. 4. Vibration Cutout Switch: (optional) Mechanical switch tode- energize fan motors if excessive vibration in NEMA 4enclosure.

3.5 MAINTENANCE ACCESSA. Internal Working / Service Platforms: Provide a completeinternal working platform and ladder system for service ofall drive components. A suitable working platform may beconstructed of the heat transfer coil for counterflow closedcircuit coolers. If a crossflow cooler is used, provide aninternal walkway with ladder and elevated workingplatform to allow for service and maintenance to motor anddrive assembly.

B. Handrails/Grabrails: Galvanized steel pipe complying with 29CFR 1910.23. If access to fan deck is required, supply aperimeter handrail with ladder from grade to fan deck.

C. Ladders: (optional) Aluminum, sloped “ships type” withgrabrail or vertical complying with 29 CFR 1910.27.

6

G16333_TextREV.QXD:Layout 1 9/9/10 12:27 PM Page 6

OPTIONAL EQUIPMENT

Pulse~Pure® Water Treatment System

The eco-ATW & eco-ATWEis available with EVAPCO’soptional Pulse~Pure®non-chemical watertreatment system. ThePulse~Pure® WaterTreatment System utilizes pulsed-power technology toprovide CHEMICAL FREE Water Treatment and is anenvironmentally responsible alternative for treatingwater in evaporative cooled equipment. It does notrelease harmful by-products to the environment andeliminates costly chemicals completely from coolerdrift and blowdown. The Pulse~Pure® systemdelivers short, high-frequency bursts of low energyelectromagnetic fields to the recirculating water inthe eco-ATW & eco-ATWE and will:

• Control Bacteria to Levels Well Below MostChemical Water Treatment Programs.

• Control the Formation of Mineral Scale on Heat-Exchange Surfaces.

• Save Water by Operating at Higher Cycles ofConcentration.

• Yield Corrosion Rates Equivalent to Chemical Water Treatment.

More benefits of offering EVAPCO’s Pulse~Pure®Water Treatment System on the new eco-ATW & eco-ATWE are:

• Pulse~Pure® Factory Mounting - FactoryInstallation of the Pulse~Pure® System GuaranteesYour Water Treatment is Installed to FactorySpecifications.

• Integral Cutting Edge Conductivity Control andBlowdown Packages that are contained in a singlefeeder panel:

Conductivity Control Package – MeasuresConductivity Utilizing a Non-Fouling Torodial Probeand Features:

• One power connection of 120 volt or 460 volt is allthat is required.

• USB port for downloadable 60 day audit trail ofsystem operation.

• Self draining conductivity loop.

Motorized Blowdown Valve – Standard for the mostreliable operation in bleed control. Three-way valveoperation provides good bleed flow without astanding column of water.

Because ongoing watertreatment service is anabsolute requirement forany evaporative cooledsystem, each purchase ofa Pulse~Pure® Water

Treatment System includes, as standard, a 1 yearwater treatment service and monitoring contractprovided by your EVAPCO Representative

EVAPCO’s Pulse~Pure® systemoffers eco-ATW & eco-ATWBowners a single-source ofresponsibility for equipment,water treatment and service.

Patent #: 7,704,364

7


OPTIONAL EQUIPMENT

Electric Water Level ControlClosed circuit coolers maybe ordered with an electricwater level control in lieuof the standard mechanicalfloat and make-upassembly. This packageprovides accurate controlof water levels and doesnot require fieldadjustment.

Stainless Steel BasinEVAPCO coolers have a modular design which allows specificareas to be enhanced for increased corrosion protection. Thebasin area of the cooler experiences turbulent mixing of airand water, in addition to silt build-up. In conjunction with theEVAPCOAT Corrosion Protection System, EVAPCO offers anoptional Stainless Steel Basin. This option provides Type 304or 316 stainless steel for the entire basin area including thesupport columns of the cooler and the louver frames.

The basin section provides structural support for the unit; it isalso the part of the unit that is most prone to corrosion. Formaximum protection against corrosion, EVAPCO can provide aStainless Steel Basin as an affordable option.

Capacity ControlTwo Speed MotorsTwo speed fan motors can provide an excellent means ofcapacity control. In periods of lightened loads or reducedwet bulb temperatures, the fans can operate at low speed,which will provide about 60% of full speed capacity, yetconsume only about 15% of the power compared with highspeed. In addition to the energy savings, the sound levels ofthe units will be greatly reduced at low speed.

Self Supporting Working PlatformEVAPCO coolers are available with a self-supporting platformwith ladder, which may be easily installed in the field. Thisoption offers significant savings compared to fieldconstructed catwalks, which must be supported by astructure external to the unit. The platform may be installedon either side, or the end opposite the connections.

Motor DavitIn the event that afan motor shouldneed to bereplaced, a motordavit is availablefrom which a chainfall can bemounted to easilylower the motor tothe ground.

Remote Sump ConfigurationFor units operating in areas where temperatures may be verylow, or where low temperatures may occur during periodswhen the unit is not operating, a sump located inside thebuilding is the preferred means of ensuring that the basinwater will not freeze. For these applications, the cooler will

be supplied withoutthe spray pump,suction strainers and allassociated piping, butis furnished with anoversized bottomoutlet.

8


OPTIONAL EQUIPMENT

Super Low Sound Fan 9–15 dB(A) Reduction versus Standard Fan!

The Super Low SoundFan offered by EVAPCOuses an extremely widechord blade design forvery sound sensitiveapplications where thelowest sound levels arerequired. The fan is one-piece molded heavy duty

FRP construction utilizing a forward swept blade design. TheSuper Low Sound fan is capable of reducing the unit soundpressure levels 9 dB(A) to 15 dB(A), depending on specificunit selection and measurement location. The fans are highefficiency axial propeller type.

The Super Low Sound Fan is available on all 8.5 ft. and largerAT Cooling Towers, eco-ATW & eco-ATWE Closed CircuitCoolers, and ATC Evaporative Condensers.

Low Sound Fan 4–7 dB(A) Reduction!

The Low Sound Fan offered by EVAPCO uses a wide chordblade design for sound sensitive applications where low

sound levels aredesired. Low SoundFan constructionuses aluminumblades and a steelfan hub. The LowSound Fan is capableof reducing the unitsound pressure levels4 dB(A) to 7dB(A),depending on

specific unit selection and measurement location. The fansare high efficiency axial propeller type.

Fan Discharge Sound Attenuation Up to 10 dB(A) Reduction!

The eco-ATW & eco-ATWE Fan Discharge Attenuator offeredby EVAPCO is an additional option available to further reducethe sound level of the unit. The attenuator can be used withthe standard eco-ATW & eco-ATWE fan or in combinationwith the Low Sound Fan option.

The discharge attenuator is a factory-assembled straight-sideddischarge hood designed to reduce overall discharge soundlevels at full fan speed 5 dB(A) to 10 dB(A), depending onspecific unit selection and measurement location. It is

constructed of G-235galvanized steel as standard(options available for Type304 stainless steel) andincludes insulated walls anda low pressure drop bafflingsystem that is acousticallylined with high densityfiberglass. The dischargeattenuator is self-supportedby the unit and is shippedloose for field mounting. A

heavy-gauge, hot-dip galvanized steel fan guard covers thedischarge attenuator to prevent debris from entering theattenuator.

The discharge attenuator has minimal impact on unit thermalperformance (0%-2% derate depending on specific unitselection).

The Discharge Attenuator is available on: ALL standard ATCooling Towers, eco-ATW & eco-ATWE Closed Circuit Coolers,and ATC Evaporative Condensers. It is also available on 12 ft.and 24 ft. wide AT, eco-ATW, eco-ATWE and ATC Models withthe Low Sound Fan option.

(Note: The eco-ATW & eco-ATWE Fan Discharge AttenuatorOption is NOT available on eco-ATW & eco-ATWE Modelsprovided with the Super Low Sound Fan.)

Water Silencer Up to 7 dB(A) Reduction!

The water silencer option is available for all eco-ATW & eco-ATWE models and is located in the falling water area of

the cold water basin. Thewater silencer reduces thehigh frequency noiseassociated with the fallingwater and is capable ofreducing overall soundlevels 4 dB(A) to 7 dB(A)measured at 5 ft. from theside or end of the unit.The water silencers reduce

overall sound levels 9 db(A) to 12 db(A) (depending on waterloading and louver height) measured 5 ft. from the side orend of the unit when water is circulated with fans off.

The water silencers are constructed of lightweight PVC sectionsand can be easily removed for access to the basin area.

Consult EVAPCO’s Advanced Technology Low SoundSolutions Bulletin No. 650-US for detailed product and specification information.

Solutions for Sound Sensitive Applications

The eco-ATW & eco-ATWE Closed Circuit Coolers are now available with four (4) equipment options to reduce the overall soundgenerated from the side or top of the eco Closed Circuit Cooler. Each option provides various levels of sound reduction and optionscan be combined to provide the lowest sound level. Consult EVAPCO’s evapSelect selection program for unit sound levels. If adetailed analysis or full octave band data sheet is required for your application, please consult your EVAPCO Sales Representative.

NOTE: These low sound options may impact the overall installed dimensions of the eco-ATW & eco-ATWE Closed CircuitCooler selected.

9


Unique Fan Drive System• Power-band belts for better lateral rigidity

• Advanced design aluminum fan blades

• Non-corroding cast aluminum sheaves

• Heavy-duty fan shaft bearings with L-10 life of75,000 - 135,000 hrs

• All other components constructed of corrosionresistant materials

• Totally enclosed fan motors assure long life

Most Accessible Basin• Access from all four sides

• Large open area simplifies maintenance

• Basin may be inspected with pumps running

Featuring… Louver Access Door• Louver access door is standard on models with 5 and 6 ft. louver sizes

• Hinged access panel with quick releasemechanism

• Allows easy access to perform routinemaintenance and inspection of the makeupassembly, strainer screen and basin

Patent #: 7,704,364

Optional Pulse~Pure®

Water Treatment System• Control bacteria to levels well below traditional chemical water treatment

• Control the formation of mineral scale

• Save water by operating at higher cycles ofconcentration

• Yield corrosion rates equivalent to chemical water treatment

Certificate of ComplianceAT, USS, UAT, UT Cooling Towers

eco-ATW/WE, ATWB and ESWA Closed Circuit Coolerseco-ATC, ATC-E Evaporative Condensers

Are certified to meet or exceed the Seismic and Wind Load Provisions set forth in the applicable building codes for this project.

These products have been manufactured following all applicable quality assurance programs.

Applicable Building Codes:IBC 2006ASCE-7NFPA 5000

Referenced Report:VMA-43387

Approval Agency:VMC Seismic Consulting Group

EVAPCO...Specialists in Heat Transfer Products and Services. ID IBC COC 001

IBC Certification Label• Provided with every unit to indicateindependentcertification and compliance

Super Low Sound Fan (Optional)• Extremely wide sloped fanblades for sound sensitiveapplications.

• One piece molded heavy dutyconstruction.

• 9-15 dB(A) sound reduction.

10

The

Water and EnergyConservation Control System The only way to properlycontrol and operate the eco-ATWE Closed CircuitCooler is to provide, asstandard, the Sage3®

Water and EnergyConservation ControlSystem. The Sage3® isdesigned to optimallycontrol the fan motor(s)and the pump motors ofthe unit. The Sage3® willefficiently reject thebuilding load using theminimal amount of water and energy.

• Sophisticated control system that measures &analyses water inlet & outlet temperatures and theambient dry bulb to minimize water consumption

• Variable frequency drive controls for fan motor(s)

• Maximizes water and energy savings

NEW!Ellipti-finFeaturing Elliptical Spiral Fin Coil Technology

Introducing the Most Efficient Closed Circuit Cooler Coil in the HVAC industry! The Ellipti-fin provides:• All coil rows feature patent pending finned Thermal-Pak ellipticaltube design

• Lower airflow resistance than typical finned round tubes• Increased Evaporative and Dry Cooling efficiency

CTI Certified†


WST II Air Inlet Louvers (Water and Sight Tight)• Easily removable for access

• Improved design to keepsunlight out–preventingbiological growth

• Keeps water in while keepingdirt and debris out

(Patent Pending)

The New eco-ATWE line of Closed Circuit Coolers offers the same great design benefits and features as theeco-ATW but it has also been specifically designed to optimize both the evaporative (latent) and dry (sensible)modes of cooling simultaneously. This unique design joins an evaporative cooler and a dry cooler into oneunit. The eco-ATWE utilizes the EVAPCO Ellipti-fin coil which features elliptical spiral fin technology tomaximize the surface area available for heat transfer. This decreases water consumption and offers additional

cost savings through reduced water make-up, blow-down, andchemical consumption. Evaporative cooling provides lower systemoperating temperatures and higher overall system efficiencies. Theeco-ATW is the ideal solution for: Lower Energy Costs, ReducingWater Consumption, High Dry Bulb Switchover, Super Low Sound

Levels. This new product is designed with IBC Compliantconstruction and CTI Certified Performance.

NEW & Improved!

Easy Field Assembly• A new field assembly seam design

which ensures easier assemblyand fewer field seam leaks

• Self-guiding channels guide the coilcasing section into positionimproving the quality of the fieldseam

• Eliminated up to 66% of fasteners

(Patent Pending)

†

11† Mark owned by the Cooling Technology Institute

Efficient Drift Eliminators• Advanced design removes

mist from the leavingairstream

• Made from corrosionresistant PVC for long life

(U.S. Patent No. 6315804)

PVC Spray Distribution Header with ZM2 Nozzles• Nozzles are threaded into

header at proper orientation

• Large orifice fixed positionnozzles prevent clogging

• Threaded end caps for ease of cleaning

Design and Construction Features

Partition PanelA water tight partition spans fromthe fan section of the unit down tothe basin. This partition separatesthe two coils and ensures waterdoes not contact the dry coil whenthe unit is operating in the waterefficient mode.

Multiple Water Distribution SystemsEach coil in this unit features itsown water distribution system.This allows each coil to operatein a mode independent of theother coil.

DESIGN FEATURES

12

Principles of OperationEvaporative Mode (Latent Heat Transfer)

In the evaporative mode, the process fluid enters the eco-ATWE cooler through the top coil connections andcirculates through the finned coils. With both pumpsenergized, the heat from the process fluid is transferredthrough the coil tubes to the water cascading downwardover the coils while simultaneously air is drawn upwardover the coil opposite the water flow using the fan drivesystem (Fan on, Pump A & B on). A small portion of thewater is evaporated to dissipate the heat to theatmosphere in a latent heat transfer. This mode ofoperation provides fan energy savings and lower leavingwater temperatures by utilizing evaporative cooling.

Water Efficient Mode (Evaporative and Sensible Heat Transfer)

The joint wet and dry operation mode provides watersavings as well as low approach temperatures. In this jointmode of operation, the fan is on and the process fluidenters the coils through the top coil connections (Fan on,Pump A on, Pump B off). Recirculating pump B is turned offand coil B rejects a portion of the heat load to theatmosphere through the tube and fin walls to the airpassing over the coils using sensible heat transfer. Pump A isleft on where heat from the process fluid is transferredthrough the coil tubes to the water cascading downwardover coil A. This mode of operation minimizes the amountof water used while maintaining the cooling capacityrequired. The cooled fluid then returns to the process viathe bottom coil connection.

Dry Mode (Sensible Heat Transfer)

In the dry mode, the recirculating spray pumps aredeenergized (Fan on, Pump A & B off). The process fluidenters the eco-ATWE cooler through the top coil connectionand circulates through the coil with the Fan On. Heat fromthe process fluid is dissipated to the atmosphere by sensibleheat transfer through the tube walls to the air passing overthe coils. The coils are finned to promote optimal airflowover the coil and to maximize heat transfer area. Air isdrawn over the finned coils by the fan drive system. Theprocess fluid then returns to the heat source via the bottomcoil connection. This mode of operation eliminates waterconsumption when the dry bulb temperature is favorable.

SECTION 23 65 00 – FACTORY-FABRICATED CLOSED CIRCUIT COOLERSPART 1 – DESIGN CONDITIONSA. Furnish and install as shown on the plans on EVAPCO Model______ induced draft counterflow closed circuit cooler. Eachunit shall be CTI Certified (with water) and have the capacityto cool ______ GPM of ______ from ______°F to______ °F witha _______ °F entering wet bulb temperature and a dry bulbswitchover temperature of ______ °F (Dry Capacity is not CTICertified).Optional: (If dry operating condition are different than thewet operating conditions)Each unit shall also cool ______ GPM of______ from______ °Fto______ °F with a ______ °F entering dry bulb temperature.

B. Controls shall be provided with unit. See Controls TechnicalSpecifications.

PART 2 – GENERAL2.1 RELATED DOCUMENTSA. Drawings and general provisions of the Contract, includingGeneral and Supplementary Conditions and Division 1Specification Sections, apply to this section.

2.2 SUMMARY: A. This Section includes factory assembled and tested, closedcircuit, induced draft counterflow cooling tower (also knownas a closed circuit cooler).

2.3 SUBMITTALSA. General. Submit the following:1. Certified drawings of the closed circuit cooler, sound data,recommended steel support indicating weight loadings, wiringdiagrams, installation instructions, operation and maintenanceinstructions, and thermal performance guarantee by themanufacturer.

2.4 QUALITY ASSURANCEA. Verification of Performance: 1. Test and certify closed circuit cooler thermal performanceaccording to CTI Standard 201.2.Test and certify closed circuit cooler sound performanceaccording to CTI ATC-128.

B. Meet or Exceed energy efficiency per ASHRAE 90.1.2.5 WARRANTYA. Motor/Drive System: Five (5) year comprehensive warrantyagainst materials and workmanship including motor, fan,bearings, mechanical support, sheaves, bushings and belt.

B. Unit: One (1) year from start-up, not to exceed eighteen (18)months from shipment on the unit.

PART 3 - PRODUCTS3.1 MANUFACTURERSA. Manufactures: Subject to compliance with requirements,provide closed circuit coolers manufactured by one of thefollowing: 1. EVAPCO, Inc.2. Approved Substitute

3.2 MATERIALSA. Galvanized Sheet Steel casing and fan housing complyingwith ASTM A 653/A 653M and having G-235 designation.

B. Optional Type 304 and/or 316 Stainless Steel as specified.3.3 INDUCED-DRAFT, COUNTERFLOW CLOSED CIRCUIT COOLERSA. Description: Factory assembled and tested, induced draftcounterflow closed circuit cooler complete with coil, fan,louvers, accessories, and rigging supports.

B. Closed Circuit Cooler Characteristics and Capacities: Refer tothe Closed Circuit Cooler schedule.

C. Fan(s): 1. Type and Material: Axial propeller, individually adjustablewide chord blade extruded aluminum installed in a closely fittedcowl with venturi air inlet for maximum efficiency, covered witha heavy gauge hot dipped Galvanized Steel fan guard.2. Maximum sound pressure level of _____dB(A) measured at5 feet above the fan discharge during full speed operationin accordance with CTI Standard ATC-128.

D. Water Distribution System: Non-corrosive materials.1. Each coil shall have a dedicated recirculation pump andwater distribution system, which are completely separatedby a water tight partition which begins above the waterdistribution systems and ends at the basin in order to allowfor simultaneous wet and dry operation.

2. Evenly distribute of water over coil with pressurized spray tree.a. Pipes: Schedule 40 PVC, Non-corrosive Materialsb. Nozzles: Non-clogging, nylon, threaded into branch piping.

E. IBC Compliance: The unit structure shall be designed,analyzed, and constructed in accordance with the latestedition of the International Building Code (IBC) Regulationsfor seismic loads up to _____ g and wind loads up to __ psf.

F. Collection Basin Material: Galvanized Steel. Type 304/316Stainless Steel Optional:1. Removable stainless-steel strainer with openings smallerthan nozzle orifices.2. Joints: Bolted and sealed watertight or welded.3. Overflow, makeup and side drain connections

G. Heat Transfer Coil: Each row of the heat exchanger coilshall be provided with elliptical spiral fins to increase theevaporative and dry thermal performance of the unit aswell as lowering the air pressure drop. Cooling coil(s) shallbe all primed surface steel, encased in a steel frameworkand hot-dip galvanized after fabrication as a completeassembly. The tubes shall be arranged in a self-spacing,staggered pattern in the direction of airflow formaximum heat transfer efficiency and minimum pressuredrop. The coil(s) shall be pneumatically ested at 400 psig,under water.

H. Casing: Galvanized Steel. Type 304/316 Stainless Steel Optional:1. Casing panels shall totally encase the heat transfer coil.2. Fasteners: Corrosion resistance equal to or better thanmaterials being fastened.3. Joints: Sealed watertight.4. Welded Connections: Continuous and watertight

I. Drift Eliminators: PVC, for long life and durability resistant torot, decay and biological attack; formed, bonded togetherfor strength and durability in block format for easy removaland replacement; self extinguishing with flame spreadrating of 5 per ASTM E84-81a; 0.001% drift rate.

J. Air Inlet Louvers: Formed PVC; designed “Sight Tight” tocompletely block direct sunlight from entering and waterfrom splashing out of the closed circuit cooler.

K. Water Level Control: Brass mechanical makeup water valveand plastic float with an adjustable linkage.

L. Water Recirculation Pump: Close-coupled, centrifugal typewith mechanical seal. The pump motor shall be ESACompliant, ____ horsepower totally enclosed for outdoorservice on ____ volts, ____ hertz, and ____ phase.

3.4 MOTORS AND DRIVESA. General requirements for motors are specified in Division 15Section “Motors”.

B. Enclosure Type: TEAO or TEFCC. Fan Motor Speed: Premium Efficient VFD Duty (Option: 2-speed)1. Motors shall be provided with space heaters.

D. Drive: Power Band Belt designed for 150% of the motornameplate HP.1. Belt: Mutli-groove, solid back V-belt type neoprenereinforced with polyester cord. 2. Sheaves: Aluminum alloy if located inside the airstream.3. Bearings: Heavy duty, self-aligning pillow block bearingswith lubrication lines extended to side access door.Minimum L10 life for bearings shall be 75,000 hours. Provideextended grease lines and fittings. 4. Vibration Cutout Switch: (optional) Mechanical switch to de-energize fan motors if excessive vibration in NEMA 4 enclosure.

3.5 MAINTENANCE ACCESSA. Internal Working / Service Platforms: Provide a completeinternal working platform and ladder system for service of alldrive components. A suitable working platform may beconstructed of the heat transfer coil for counterflow closedcircuit coolers. If a crossflow cooler is used, provide an internalwalkway with ladder and elevated working platform to allowfor service and maintenance to motor and drive assembly.B. Handrails/Grabrails: Galvanized steel pipe complying with 29CFR 1910.23. If access to fan deck is required, supply a perimeterhandrail with ladder from grade to fan deck.C. Ladders: (optional) Aluminum, sloped “ships type” withgrabrail or vertical complying with 29 CFR 1910.27.

13

SPEC IF ICAT IONS


EVAPCO’s … Water and Energy

14

The EVAPCO eco-ATW closed circuit coolers utilize the optionalSage2® water and energy conservation control system which controlsDry & Evaporative modes of operation. The eco-ATWE is providedstandard with the Sage3® control panel which controls Dry, WaterEfficient and Evaporative modes of operation. The control systemoperates by measuring and analyzing water inlet and outlettemperature simultaneous with ambient dry bulb monitoring inorder to minimize the evaporative cooling mode of operation andto save system water. The Sage can also be programmed to operatewith a water savings or energy savings priority.

The Sage Controller features a NEMA 4 enclosure with UL approval.The panel also includes a 10" touch screen operator interface withcolor display and a Modbus 485* data port for communication withthe building automation system. The data points are: InletTemperature, Outlet Temperature, Dry Bulb Temperature, BasinWater Temperature Sensor, Fan Run Time, Pump Run Time, VFDSpeed, Fan Motor Status – On/Off, Fan RPM, Pump Status – On/Off.

Standard Control Items• A MODBUS 485* Port for the BuildingAutomation System

• Programmable Logic Control

• Fluid Inlet Temperature Sensor(s)

• Fluid Outlet Temperature Sensor(s)

• Basin Temperature Sensor(s)

• Ambient Dry Bulb Sensor(s)

• Variable Frequency Drive(s) for Fan Motor(s)

• Recirculating Pump Motor Starter(s).

• Main Disconnect

• Manual Bypass

• DC Power Supply for the PLC andInstrumentation.

• Heater Package Controls w/ Contactor withOverload Protection

• Control Power Transformer

• 5-Probe Electronic Water Level Control Package

• High Water Level Alarm Contact(s)

• Low Water Level Alarm Contact(s)

• Fan Motor: Space Heater Control(s)

Control for Optional Accessories• Discharge Hood Damper Controls

• Vibration Switch Controls

SAGE SYSTEM


15

Conservation Control System

SAGE SYSTEM

HMI Panel DisplayAll Sage2® and Sage3® Control Panels are provided with a 10” touch screen operator interface with a color display. This allows for easy viewing and control at the panel.

Easy-to-use Touch Screen NavigationThe panel boasts an easy to navigate menu which will allowthe user to control each cell independently from other unitsand gather useful run time information at the unit.

Window EnclosureThe display screen is encased by a window enclosure. Thisenclosure protects the HMI display from the elements.

Electric Water Level Control PackageWhen a Sage® Panel is provided, a 5-probe Electronic WaterLevel Controller is standard. In addition to controlling themake-up valve, this controller contains two probes that can beutilized as High/Low water alarms. This controller will also beused as a safety device, shutting off the pump and heaters ifthe water level becomes too low.

Temperature SensorsFour separate temperature data points are monitored withthis package.

• Inlet Temperature Sensor: 32ºF – 212ºF range

• Outlet Temperature Sensor: 32ºF – 212ºF range

• Dry Bulb Temperature Sensor: -30ºF – 130ºF range

• Basin Temperature Sensor: 32ºF – 212ºF range

Enclosure Temperature ControlThe panel enclosure includes an intake and an exhaustventilation fan. When the enclosure temperature rises to apredetermined set point, the exhaust fans are activated. Theenclosure also contains a heater. The heater eliminates thedrastic temperature changes which could create condensationinside of the enclosure.

Plan View Screen

End View Screen

Alarm Setpoints Screen

*Optional Communication Protocol May Be Available. Please Contact Your Local Sales Representative.

Fan Heater

16

DES IGN FEATURES

eco-ATW Operating BenefitsThe eco-ATW features the new EVAPCO Ellipti-fin coil, whichutilizes elliptical spiral fin coil technology. This technology allowsfor a significant increase in thermal performance with up to a40% lower operating horsepower (HP) than a typicalevaporative cooler! This will results in tremendous energysavings throughout the year.

If minimizing the footprint of the unit is of greater concern, theincreased thermal capacity of the Ellipti-fin technology willallow a selection that yields up to a 40% smaller plan area!

Additionally, the Ellipti-fin coil technology enables the eco-ATWto be operated in a 100% Dry Mode, whereby the switchovertemperature is significantly higher than that of a typical baretube coil. This leads to a significant increase in dry operatinghours, thus increasing your water savings. This combination offeatures allows the eco-ATW to be operated with both energyand water efficiency in mind, making it the ideal choice formany installations.

eco-ATWE Operating BenefitsThe eco-ATWE maintains all of the advantages of the eco-ATWwith the additional benefit of enabling simultaneous wet and dryoperation. The unique Water Efficient Mode of the eco-ATWEallows for a portion of the heat load to be rejected through bothevaporative cooling AND dry cooling, even at high ambienttemperatures, this further increases your ability to save water andoffers additional associated cost savings through reduced watermake-up, blow-down and chemical consumption. The eco-ATWEprovides an ideal solution for applications where minimizing bothenergy and water consumption is critical.

Depending on the optimum eco-Cooler you select for your job, onecan operate 100% wet, 100% dry or simultaneously Wet & Dry inthe Water Efficient Mode, offering unique advantages in freezingclimates, higher temperature industrial cooling applications where100% evaporative cooling is not always favorable.

eco-ATW & eco-ATWE Operational Savings:Consider a Data Center cooling application for Minneapolis, MNwhere the unit is required to reject a constant heat load of 216tons with 650 gpm of water entering at a temperature of 95°F anda leaving temperature of 85°F. The process operates 24 hours aday 7 days a week. Both the eco-ATW and the eco-ATWE arecompared to:

• Cooler A – an evaporative cooler without dry cooling capability• Cooler B– an induced draft counter-flow cooler capable of

some dry operation

The eco-Coolers require lower pump HP than Cooler A andlower pump HP and fan HP than Cooler B. Additionally, the eco-Coolers provide either a similar or smaller footprint alongwith the HP savings.

With the increased dry cooling efficiency of the eco-ATW andeco-ATWE and the use of the Sage® Water and EnergyConservation Control System, each unit is able to operate dry for48.00% of the year. Additionally, the revolutionary design of theeco-ATWE allows the unit to operate in a Water Efficient Modefor an additional 47.9% of the year, further reducing waterconsumption. This is illustrated below:

eco-ATW eco-ATWE 12-6L12-Z 12-6L12-Z Cooler A Cooler B Fan Motor HP 25 25 25 (2) 20 Spray Pump HP 5 (2) 2 10 (2) 3 Box Size (ft) 12x12 12x12 12x12 17x12 Weight (lbs.) 27,530 28,115 24,880 39,700

Model Attribute Comparison

Yearly Temperature Curve

Monthly Water Usage Comparison

*Based on 3 cycles of concentration **$0.006 per gallon (Water & Sewer)

Due to the Dry Operation capabilities of the eco-Coolers andthe added Water Efficient Mode of the eco-ATWE the reducedcosts associated with water usage is illustrated below:

Summarizing these costs, the eco-Coolers will save theoperator a minimum of $18, 864 per year in associated watercosts vs. a typical cooler and up to $10,000 vs. an induceddraft counter-flow cooler with some dry capacity.

eco-ATW eco-ATWE 12-6L12-Z 12-6L12-Z Cooler A Cooler B Dry Bulb Switchover ºF 46.22 46.22 NA 33.44 % Dry Operation (Hrs.) 48.00% 48.00% NA 31.00% % Water Efficient Mode (Hrs.) NA 47.90% NA NA

Dry Mode of Operation Comparison

eco-ATW eco-ATWE 12-6L12-Z 12-6L12-Z Cooler A Cooler B Total Annual Water Usage* (gallons) 2,609,876 1,897,074 5,753,899 3,568,387 % Savings vs. Cooler A / 54.64% / 67.03% / - / 37.98% / Cooler B 26.86% 46.84% - - Annual Water Savings $18,684 / $23,140 / - / $8,132 / vs. Cooler A / Cooler B** $5,751 $10,027 - -

Annual Water Cost Comparisons

Deg

rees

Fah

renh

eit

NOTES

17


IBC COMPL IANCE

What is IBC?International Building CodeThe International Building Code (IBC) is a comprehensiveset of regulations addressing both the structural designand the installation requirements for building systems –including HVAC and industrial refrigeration equipment.The IBC is intended to replace BOCA’s The NationalBuilding Code, ICBO’s Uniform Building Code and SBCCI’sStandard Building Code.

Compared to previous building codes that consideredonly the building structure and component anchorage,the requirements contained within the IBC addressanchorage, structural integrity, and the operationalcapability of a component following either a seismic orwind load event. Simply stated, the IBC codeprovisions require that evaporative coolingequipment, and all other components permanentlyinstalled on a structure, must be designed to meetthe same seismic and wind load forces as thebuilding to which they are attached.

How Does IBC 2006 Apply to ClosedCircuit Coolers?Based on the project zip code and site design factors,calculations are made to determine the equivalentseismic “g force” and wind load (in pounds per squarefoot – psf) on the unit. The closed circuit cooler must bedesigned to withstand the greater of either the seismic orwind load.

More than 80% of the United States has design criteriaresulting in a seismic design force of 1.0g or below. Thesesites will be provided with the standard ATWB structuraldesign. An upgraded structural design is available forinstallations with design criteria resulting in “g forces”

greater than 1.0g. The highest “g force” location inNorth America is 5.12g. The highest wind load shown onthe maps is 170 mph, which is approximately equal to 145psf velocity pressure. Therefore, the upgradedstructural design package option for the New ATWBis designed for 5.12g and 145 psf making itapplicable to ALL building locations in NorthAmerica.

Seismic DesignThe attached chart from the US Geological SurveyWebsite (http://www.usgs.gov/) shows the potentialseismic activity in the United States. Buildings constructedin the red, orange and yellow areas of the map mayrequire the upgraded ATWB construction design basedon the site seismic design factors and should be reviewedclosely. Critical use facilities, such as hospitals, are alsomore likely to require the upgraded design.

The project architect or civil engineer is responsible fordetermining the seismic design factors to be used for thebuilding design. A mechanical consulting engineer and/ordesign build contractor then applies these factors to aseries of charts and graphs to determine the appropriateseismic design factors based on the location of theinstallation and ultimately the “importance” of thefacility. The specific factors necessary for seismic design aswell as a sample seismic calculation are shown on thenext page.

32+

Highest Hazard

Lowest Hazard

%g

24-3216-248-164-82-40-2

Map courtesy US Geological Survey website

In its continuing commitment to be the leaders in evaporative cooling equipment design and services,EVAPCO ATWB Closed Circuit Coolers are now Independently Certified to withstand both Seismicand Wind Loads in ALL Geographic Locations and Installations in accordance with IBC 2006.

The New ATWB is offered with a choice of TWOstructural design packages:

• Standard Structural Design – For projects with ≤ 1.0g seismic or 145 psf wind loads

• Upgraded Structural Design – Required forprojects with > 1.0g seismic or 145 psf max windloads

18


IBC COMPL IANCE

Wind DesignThe IBC 2006 code book includes a map of basic windspeed (3-second gust) by contour lines. However, localregulations may be more stringent than these publishedspeeds. The specific factors necessary for wind load as wellas a sample wind load calculation are shown on Page 16.

Whichever design force - seismic or wind - is moresevere for the building, governs the design of thebuilding and all attached equipment.

Design ImplementationEVAPCO applies the given seismic and wind loadinformation provided by the mechanical consultingengineer to determine the equipment design necessaryto meet IBC requirements. This process ensures that themechanical equipment and its components are compliantper the provisions of the IBC as given in the plans andspecifications for the project. For design build projects,EVAPCO is equipped to look up the information andsubmit the resulting loads for approval.

Independent CertificationPer the most recent edition of the code, the EVAPCOcompliance process included an exhaustive analysis by anindependent approval agency. As required by theInternationalBuilding Code,EVAPCOsupplies acertificate ofcompliance aspart of itssubmittaldocuments. Thecertificate ofcompliance

demonstrates that the equipment has been independentlytested and analyzed in accordance with the IBC seismic andwind load requirements. Evapco has worked closely withthe independent approval agency, The VMC Group, tocomplete the independent equipment testing and analysis.

If the seismic “g force” and wind “psf” load requirementsfor the project site are known, EVAPCO’s onlineequipment selection software, iES, will allow you tochoose the required structural design package – eitherstandard construction or upgraded construction.

If the project requirements are unknown, the followingcalculations must be completed.

For further questions regarding IBC compliance, pleasecontact your local EVAPCO Representative or visitwww.evapco.com.

Seismic Load CalculationsThe data required to calculate the seismic load are:

Occupancy Category – I, II, III or IV depending on thenature of the building occupancy. Table 1604.5 in the IBC2006 Code Book defines each of the four categories indetail. In summary the four categories are:

• Category I - structures that represent a low hazard to human life in the event of a failure. • Category III - structures that represent a substantial hazard to human life in the event of a failure. • Category IV - structures designated as essential facilities. • Category II - any structures not listed in I, III or IV.

Site Classification – A, B, C, D, E or F based on the typesof soil and their engineering properties. Table 1613.5.2in the IBC 2006 Code Book defines each of the categoriesin detail. IBC specifies site class “D” when soil propertiesare unknown.

Maximum Spectral Response Acceleration (Ss) –Numerical value found using the U.S. Geological (USGS)data based on the Zip Code of the project. This datapoint can be determined using the Ground MotionParameter Calculator at http://www.usgs.gov/. Note thecalculator assumes a site classification of B for the 0.2second maximum Ss. The site coefficient (Fa), definedbelow, will correct for the actual site classification.

When using the EVAPCO selection software to make aselection, these calculations are already incorporatedinto the selection process. Simply enter the requiredseismic factors and the Seismic Design Force and WindLoad will be calculated automatically!!

Wind Load Map Courtesy IBC 2006 Text –See full-sized map for location specific values

19

IBC COMPL IANCE

Site Coefficient (Fa) – Values ranging from 0.8 to 2.5determined based on the Ss and the Site Classification.Table 1613.5.3(1) in the IBC 2006 Code Book definesthese values.

Design Spectral Response Acceleration (SDS) – Acalculated value using the values for Ss and Fa.

Amplification Factor (ap) – 2.5 for flexible componentsor flexibly attached components. Due to its low inherentnatural frequencies, most evaporative cooling equipmentfalls under the definition of flexible. Therefore thedefault for Closed Circuit Coolers is 2.5. See Table 13.6-1in the American Society of Civil Engineers (ASCE)Standard 7-05, to which IBC often references, for moreinformation.

Response Modification Factor (Rp) – 2.5 for non-isolated evaporative cooling equipment. 2.0 for vibrationisolated evaporative cooling equipment. Table 13-6.1 ofASCE 7-05 provides additional information.

Component Operating Weight (Wp) – This weightterm has been removed from the equation below,because EVAPCO is expressing the force in terms of g’sand not lbs.

Importance Factor (Ip) – 1.5 for Occupancy Category IV,life safety components required to function after aseismic event or component containing hazardouscontent. 1.0 for all other components. ASCE 7-05 Section13.1.3 provides additional detail on importance factors.

Installation Location (Z/h) – 0 for units installed atground level. 1.0 for units installed on a rooftop. PerASCE 7-05 Section 13.3, z = the height of the point ofattachment of the component and h = the relative roofheight.

Seismic Design Force, (Fp) – “G-force” that the unitmust be able to withstand. This number is calculatedusing the factors described above. The New ATWB isoffered with a choice of two structural design packages,consisting of:

– Standard Structural Design ≤ 1.0g – Upgraded Structural Design – up to 5.12g (the maximum value for North America)

Seismic Load Sample Calculation

The following example demonstrates the procedure fordetermining which structural design package aCommunity Hospital located in Charleston, SC (zip code29401) would require under the latest version of IBC. Inthis example, the closed circuit cooler will be installed ona roof, approximately 60 feet above grade. The unit willalso be installed with a vibration isolation system.

Step 1: Calculate the Design Spectral ResponseAcceleration (SDS)

Where:

SS = 1.495; using the USGS Ground Motion Parameter Calculator

Fa = 1.0; from Table 1613.5.3(1) in the IBC 2006 CodeBook assuming a Site Classification of D

Step 2: Calculate the Seismic Design Force (Fp )

Where:

ap = 2.5; the default for cooling towers and closed circuit coolers

SDS = 0.9966; as calculated in Step 1

Wp = 1.0; the default for cooling towers and closed circuit coolers

Rp = 2.0; the default for isolated equipment

Ip = 1.5; the default for life safety components

z/h = 1.0; the default for units on a rooftop

In order to meet Code requirements, the unit and itsanchorage must be constructed to withstand 2.24g. Thiswill require that the upgraded structure option be chosento meet the seismic requirements of this project. Becausethe seismic load requires the upgraded structural design,the wind load calculation results will not change thedesign and are not required for this analysis.

20

IBC COMPL IANCE

Wind Load CalculationsNote, both the standard construction and the upgradedconstruction ATWB Closed Circuit Cooler are designed tomeet a wind load of 145 psf. Therefore, the followingdetails are provided for informational purposes only.

The data required to calculate the wind load are:

Basic Wind Speed (V) – Numerical value, in miles perhour (mph) found in ASCE 7-05 Figures 6-1 (A,B,C).

Wind Directionality Factor (Kd) – 0.85 for buildingcomponents and cladding. Table 6-4 of ASCE 7-05provides additional information.

Occupancy Category – I, II, III or IV depending on thenature of the building occupancy. Table 1604.5 in theIBC 2006 Code Book defines each of the categories indetail. This is the same Occupancy Category used inSeismic calculations.

Importance Factor (I) – Numerical value between 0.77and 1.15 based on the Basic Wind Speed and theOccupancy Category. These values are found in Table 6-1of ASCE 7-05.

Exposure Category – B, C or D as defined in Section6.5.6.3 of ASCE 7-05.

Component Elevation (z) – The anchorage height ofthe unit in feet.

Nominal Height of the Atmospheric Boundary Layer(zg) - Numerical value based on Exposure Category. Thesevalues are found in Table 6-2 of ASCE 7-05.

3 second Gust-Speed power Law Exponent (α) -Numerical value based on Exposure Category. Thesevalues are found in Table 6-2 of ASCE 7-05.

Velocity Pressure Exposure Coefficient (Kz) – Acalculated value using the values for zg and α.

Topographic Factor (Kzt) – 1.0 default whentopographic effects are not a factor. ASCE 7-05 Section6.5.7 provides additional detail on topographic factors.

Velocity Pressure (qz) – This number in pounds persquare foot (psf) is calculated using the factors describedabove. The New ATWB is offered with a choice of twostructural design packages, consisting of:

– Standard Design and Upgraded Structural Design – both up to 145 psf (the maximum value for North America)

Wind Load Sample Calculation

The following example demonstrates the procedure todetermine which structural design package aCondominium Building located in Miami, FL (zip code33101) would require under the latest version of IBC. Inthis example, the closed circuit cooler will be installed onthe top of the 60 foot tall building.

Step 1: Calculate the Exposure Category Coefficient (Kz)

Where:

z = 60; Installation Height

zg = 700; from ASCE 7-05 Table 2 using an ExposureCategory of D.

α = 11.5; from ASCE 7-05 Table 2 using an ExposureCategory of D.

Step 2: Calculate the Velocity Pressure (qz)

Where:

Kz = 1.31; as calculated above.

Kzt = 1.0; default when topographic effects are not afactor.

Kd = 0.85; default for building components andcladding.

V = 145; wind speed from ASCE 7-05 Figure 6-1.

I = 1.0; Based on an Occupancy Category of II.

In order to meet Code requirements, the unit and itsattachments must be designed and constructed towithstand 59.93 psf. Because the wind load does notdictate the closed circuit cooler design, the seismic loadcalculation must also be completed to determine if theresults will change the unit design.

( )KZ = 2.01 a

2zzg( )

qz = 0.00256(Kz)(Kzt)(Kd)(V2)(I) =

0.00256(1.31)(1.0)(0.85)(1452)(1.0) = 59.93psf

( )( )KZ = 2.01 a

2 2

11.5zzg( ) = 2.01 = 1.31

60700( )

21


NOTES

22


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EVAPCO Europe, S.r.l.Via Ciro Menotti 10I-20017 Passirana di RhoMilan, ItalyPhone: (39) 02-939-9041Fax: (39) 02-935-00840E-mail: [email protected] Europe, S.r.l.Via Dosso 223020 Piateda Sondrio, ItalyEVAPCO Europe, GmbHBovert 22D-40670 Meerbusch, GermanyPhone: (49) 2159-69560Fax: (49) 2159-695611E-mail: [email protected] coil a/sA subsidiary of EVAPCO, Inc.Knøsgårdvej 115DK-9440 Aabybro DenmarkPhone: (45) 9824 4999Fax: (45) 9824 4990E-mail: [email protected] S.A. (Pty.) Ltd.A licensed manufacturer of EVAPCO, Inc.18 Quality RoadIsando 1600Republic of South AfricaPhone: (27) 11 392-6630Fax: (27) 11-392-6615E-mail: [email protected] Egypt Engineering Industries Co.5 El Nasr Road, Nasr City, Cairo, EgyptPhone: +2 (02) 24022866/+2 (02) 24044997/8Fax: +2 (02) 24044667/8Mobile: +2 (012) 3917979E-mail: [email protected] / [email protected] / [email protected]: www.Tibagroup.me

Evapco (Shanghai) Refrigeration Equipment Co., Ltd.1159 Louning Rd., Baoshan Industrial ZoneShanghai, P.R. China, Postal Code: 200949Phone: (86) 21-6687-7786Fax: (86) 21-6687-7008E-mail: [email protected]

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1500/0910/YGS Bulletin 230

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