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ConfidentialENGINEERING BULLETINProduct: EVAPCO AXS vs. BAC 3000 vs. SPX/Marley NCNo. 74Date: Jun 2015Introduction:This engineering bulletin is designed to compare the EVAPCO AXS product line ofcooling towers to the BAC* Series 3000 and SPX/Marley* NC cooling towers. Use this guideto promote the application and key advantages of EVAPCO AXS cooling towers to yourengineers, contractors and owners.*BAC is a registered trademark of Baltimore Aircoil Co., Inc. with whom EVAPCO has no affiliation or relationship*SPX/Marley is a registered trademark of SPX Cooling Technologies, Inc. with whom EVAPCO has no affiliation or relationship
2Advantages:Drift EliminatorsAir Inlet Louvers1. Bonded Fill MediaEVAPCOEVAPCO crossflow fill features integral drifteliminators and air inlet louvers. The integral designallows for entire bonded block sections to be easilyhandled. Block sections are each 1 ft. wide x 2 ft.long and the section height varies with unit size. Thebonded block design allows for minimal air bypasssince the fill sheets will not separate over time.Fill MediaEVAPCO Crossflow FillBAC and SPX/MarleyBAC and SPX/Marley utilize sheet fill in their crossflow cooling towers. This fill is a hangingsheet-type which is supported from galvanized steel bars or tubes that span the width of thecasing panels. The sheet fill is not bonded together so the spacing between fill sheets duringmanufacturing is critical to overall performance. The fill sheets may potentially separate overtime allowing air to bypass. Air bypass leads to a negative thermal performance impact since aportion of the incoming air does not make contact with the recirculated system water.Marley sheet fill includes integral drift eliminators and air inlet louvers. BAC sheet fill featuresintegral drift eliminators and separate inlet louvers. Direct exposure to the outside elementsincreases the potential for visible scale build up on the fill sheets over time.Gaps in Integral Drift EliminatorsPoint of View: Inside of Unit Looking OutInlet Louvers and Separated Fill SheetsPoint of View: Outside of Unit Looking In
32. Bottom Supported Fill MediaEVAPCOThe bonded block crossflow fill is bottomsupported with G-235 galvanized steel channelsas standard. The supports will change to Type 304or 316 stainless steel dependent upon the stainlesssteel basin construction. The bottom supportsallow a minimum clearance of 3” above the basinfloor for routine basin cleaning. This allowssufficient room for optional factory supplied sumpsweeper piping to be used whenever sweeperpiping is required.An Example of Crossflow Fill SaggingPoint of View: Inside of UnitBasin FloorAXS Bottom Fill Support Drawing DimensionsBAC and SPX/MarleyHanging fill sheets may begin to sag and stretchover time until the fill sheets are touching thebasin floor. It may be necessary to field cut the fillsheets 3-4” from the bottom to allow access forroutine basin cleaning. Trimming the fill sheetsreduces efficiency and creates a negative thermalperformance impact. Any sediment or debrisunder the fill sheets will be trapped causing thelikelihood of localized corrosion to greatlyincrease when the fill sheets rest on the basinfloor.
43. Modular Hot Water BasinsEVAPCOThe hot water basins are designed such that they canbe easily removed and replaced without the need toremove any side or end casing panels. The standardconstruction for hot water basins is G-235 galvanizedsteel*. EVAPCO’s modular hot water basin designallows for minimal downtime and lower replacementcosts over the competitor’s traditional crossflow hotwater basin design.EVAPCO Hot Water Basin Exploded ViewBAC and SPX/MarleyOther crossflow cooling towers include hot waterbasins constructed of G-235 galvanized steel asstandard*. However, the hot water basins are integralto the end or side panels. Replacement costs could behigher for this design because it typically requiresadditional work to remove and replace the hot waterbasins.Corroded Hot Water Basin* Due to the corrosive environment of the hot water basin it is not uncommon to replace thehot water basin before the unit has exceeded its useful life.
54. Cold Water Basin Covers (optional)EVAPCOCold water basin covers are an optional accessory for the AXS cooling tower. The cold waterbasin covers effectively block sunlight and debris from coming in direct contact with basin waterat the air inlet ends.*The material of construction for coldwater basin covers will match that of thebasin panels (G-235 galvanized steel,Type 304 or Type 316 stainless steel) andwill be provided with handles for easyremoval and handling. These removablecovers provide protection against debrisand sunlight from the air inlet ends whilestill offering access for routine basincleaning and visual inspection fromoutside the unit.EVAPCO Cold Water Basin CoversBACBAC utilizes a sloped basin feature which does not allow sunlight to come in direct contact withbasin water at either air inlet end of the unit.* The basin slopes up to the basin end panels at thebottom of the fill sheets as part of the basin design. Although the design provides protectionagainst sunlight through the air inlet ends it does not allow access for routine basin cleaning andvisual inspection from outside the unit.SPX/MarleySPX/Marley has an optional accessory similar to the cold water basin covers offered byEVAPCO. The covers claim to protect the basin from sunlight and debris.** Due to the inherent design of crossflow cooling towers sunlight will contact basin waterthrough the fan cylinder opening for any manufacturer.
6Nomenclature:EVAPCO AXS Series:BAC 3000 Series:
7SPX/Marley NC Series:
8Comparison:The EVAPCO AXS should be used as a complimentary product to the AT counterflow productline. Please refer to the Marketing Department or evapSelect to find the right product for the job.Model NumberEVAPCOAXS 12-1G22AXS 12-1H22AXS 12-1I22AXS 12-1J22AXS 12-1K22AXS 12-1L22AXS 12-1M22AXS 12-1N22AXS 12-1O22AXS 12-1P22AXS 12-2I22AXS 12-2J22AXS 12-2K22AXS 12-2L22AXS 12-2M22AXS 12-2N22AXS 12-2O22AXS 12-2P22AXS 12-2Q22AXS 12-2R22AXS 14-1H24AXS 14-1I24AXS 14-1J24AXS 14-1K24AXS 14-1L24AXS 14-1M24AXS 14-1N24AXS 14-1O24AXS 14-1P24AXS 14-2J24AXS 14-2K24AXS 14-2L24AXS 14-2M24AXS 3E-1424-14OXES3E-1424-14PMotor 35691739780729797855901986
9AXS 14-2O24AXS 14-2P24AXS 14-2Q24AXS 14-2R24AXS 139410481107117812881366The following Dimensional Analysis provides detailed information about the full product line ofEVAPCO AXS, BAC 3000 Series and SPX/Marley NC series.
10Dimensional Analysis:EVAPCO AXS SeriesModelNumberNominalTonnageFanMotor HPOperatingWeightShippingWeightAXS 12-1G22AXS 12-1H22AXS 12-1I22AXS 12-1J22AXS 12-1K22AXS 12-1L22AXS 12-1M22AXS 12-1N22AXS ,78012,580AXS 12-1P22AXS 12-2I22AXS 12-2J22AXS 12-2K22AXS 12-2L22AXS 12-2M22AXS 12-2N22AXS 12-2O22AXS 12-2P22AXS ,06041,25020,31041,40020,450AXS 12-2R22114810041,79020,850WidthLengthHeight11'-4 1/4"11'-10"22'-9"22'-6 7/8"
11EVAPCO AXS SeriesModelNumberNominalTonnageFanMotor HPOperatingWeightShippingWeightAXS 14-1H24AXS 14-1I24AXS 14-1J24AXS 2532,22514,61532,27314,663AXS 14-1L24AXS 14-1M24AXS 14-1N24AXS 632,77015,15932,87015,259AXS 14-1P24AXS 14-2J24AXS 14-2K24AXS 14-2L24AXS 14-2M24AXS 99723,349AXS 14-2O24AXS 14-2P24AXS 14-2Q24AXS 23,70350,45023,80250,85524,207AXS 14-2S24135712551,67325,025WidthLengthHeight11'-4 1/4"13'-11 1/4"24'-9"22'-6 7/8"
12BAC 3000 SeriesModel NumberNominalTonnageFanMotor HPOperatingWeight (lbs)ShippingWeight '-1"12'-6"9'-10"20'-1"10'-10"
13BAC 3000 SeriesModel NumberNominalTonnageFanMotorHPOperatingWeight (lbs)ShippingWeight 5"
14BAC 3000 SeriesModel NumberNominalTonnageFanMotor HPOperatingWeight (lbs)ShippingWeight 24'-1"12'-4"
15BAC 3000 SeriesModel NumberNominalTonnageFanMotorHPOperatingWeight (lbs)ShippingWeight '-1"22'-5"22'-9"22'-5"
040SPX/Marley NC SeriesShippingOperatingWeightWeight (lbs)(lbs)WidthLengthHeight781040626'-6 1/4"12'-10"10'-2 1/2"1017148908'-4 3/4"14'-2"10'-3"1581274428'-4 3/4"18'-2"11'-11 1/4"1969186859’-10 3/4"19'-11"11'-11 1/4"
405060101520253040506075SPX/Marley NC LengthHeight248241166411'-10 3/4"21'-0"11'-11 3/4"300131370013'-10 3/4"22'-5"11'-11 3/4"373341795311'-10 3/4"22'-5"18'-10"
18SPX/Marley NC 162035813'-10 3/4"22'-5"18'-10"452302056111'-10 3/4"22'-5"22'-7 3/16"489372267113'-10 3/4"22'-5"22'-7 3/16"
cooling towers to the BAC* Series 3000 and SPX/Marley* NC cooling towers. Use this guide . Cold water basin covers are an optional accessory for the AXS cooling tower. The cold water . Model Number Motor (HP) Tonnage EVAPCO BAC SPX HP AXS S3E NC AXS 12-1G22 N/A NC8407KAN 5 312 317 AXS 12-1H22 XES3E-1222-07J NC8407MAN 7.5 353 354 362 .
