Filtration Solutions

for Gas Turbines,

Generators, and Compressors

GTS-302GTS-302GTS-302GTS-302GTS-302rev 6/05rev 6/05rev 6/05rev 6/05rev 6/05

Cooling Inlet Air Improves Turbine OutputChoose Evaporative Cooler or Chiller Coils to Create Higher Mass-Flow Rate

Cooling the turbine inlet air --even by a few degrees -- canincrease power output substan-tially. This is because cooled air isdenser, giving the turbine a highermass-flow rate and resulting inincreased turbine output andefficiency -- even as much as 0.4%per degree Fahrenheit or about0.7% per degree Celsius. (Seegraph on p. 4)

Donaldson offers two well-proveninlet air cooling methods:Evaporative cooling and chillercoils. The chart at right containsguidelines for their application.

Donaldson evaporative coolersand chiller coil systems arecurrently cooling gas turbineengines all over the world, fromSouthern California to SaudiArabia -- in hot & arid climates,hot & humid climates, and inplaces with seasonal heat.

Designs range in size from 25,000cfm to 1,300,000 cfm, and areavailable with choices in mediaefficiency and materials.

EvaporativeCooler Module

GDX self-cleaningfilter house withinlet hoods

This Donaldson Evaporative Cooler enablesthis GE Frame 7FA Gas Turbine nearLubbock, Texas, USA, to yield maximumoutput even during the hot dry summermonths.

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Economical operation Uncomplicated system

Can cool the inlet air regardless of ambient humidity Can be sized for small or large systems Broad range of cooling achievable, down to 45F/7C

Advantages:

Disadvantages: Cooling efficiency depends on relative humidity of ambient intake air....high humidity can inhibit cooling effect Need source of make-up water

Need source of chilled water Causes slightly higher P than an evap cooler does

Chiller CoilsEvaporative Cooler

This Donaldson GDX filter system + ChillerCoil filters and cools the air for an AlstomGTX100 gas turbine in the seasonally hot &humid climate of the upper midwest USA.

Chiller Coil System

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Donaldson designs the chiller coilsystem as a module that is typicallypositioned downstream of the airfilters. This allows the coils, finsand parts to stay clean enough tofunction well for many years. Onsome systems where thispositioning is impossible orundesirable for some reason, werecommend using pre-filters toensure the cleanliness andfunctionality of the coils.

For maximum turbine perfor-mance, the design temperature ofthe air leaving the cooling systemand entering the turbine is typicallyno less than 45F / 7C. Theambient air temp and the altitudeat the site are the major factorsused in sizing and designing a coilsystem. Cooling agents are usuallyeither water or a water/glycol mix,depending on local ambientconditions. While Donaldsondoesnt supply systems containingammonia, we will work with yoursupplier who does.

How It WorksAs airflow passes through thechilled coils, the air is cooledthrough an indirect heatexchange with the coolingfluid. The air then passesthrough drift eliminatormedia and into the turbine.

The coils are cold andtherefore condensation iscreated. Condensate dropletsare directed downward andcollected in pans, thendirected out of the system.Typically, allcondensation iseliminated this way, butto ensure air dryness, misteliminator panels are in place toremove any stray condensatedroplets.

(A) Access Module: Provides access so operators cancheck systems functionality andperform repairs should they benecessary. Can be equipped with lights or accesshatches or doors.

(B) Chiller Coil Section: Chiller coil tubes are typically madeof copper and caged with aluminumfins that economically and effectivelyextend the cooling surface area. Coilcasings are stainless steel for long life. Supply and return manifoldsdistribute incoming water evenly toindividual coil headers so that all

The Donaldson Chiller Coil System typicallyoccupies a space between the filter houseand the transition.

A

C

coils cool the airflow to the sametemperature. When moist air is cooled below thewet bulb temperature, condensationforms. Condensate is collected instainless steel drip pans and directedout of the system.

(C) Drift Panels: A final preventive measure, drifteliminator panels prevent anyremaining condensate droplets fromgoing into the ducting. Moisture removed by the drifteliminator panels is drained into thesump at the bottom of the unit.

Chiller System Components

B

(letters correspond to drawing above)

Chiller Coil Systems

(3) Mist Eliminator(1) & (2) Cooling Media

(1) Clean,Warm Air (4) Cooled Air

to Turbine Inlet

How It Works(1) When the filtered air passes through the saturated evaporative

cooling media, water evaporates off the wet media. This evap-oration is the process that reduces the air temperature.

(2) Excess water that does not evaporate is directed downward so asnot to be carried along with the cooled air.

(3) Cooled air then passes through the integral mist eliminator, whereleftover water droplets are removed.

(4) Clean, cooled air is then directed into the turbine inlet.

We generally recommend that theevaporative cooler module bepositioned downstream of the filtersection. Our new, improved designoffers several advantages:

Easier installation: Because ofour exclusive construction design(patent pending), there is almost nofield welding necessary duringerection. This means faster,simpler, more reliable installation.

Solid structural design (patentpending) minimizes leak-through.

Fewer mechanical and moreelectrical & electronic controlsyield a highly reliable watercontrol system that is much moresensitive and responsive to waterlevel needs.

Low air pressure drop of 0.3-0.4inches w.g., or 0.5-0.6 inches w.g.,depending on your media choice.

Two coats of epoxy on thecarbon steel structural membersprevent corrosion. Pans and othercomponents are made of corrosion-resistant materials.

Hazard Protection Little or no water carryover,thanks to integral drift/misteliminators that prevent dropletsfrom reaching the gas turbine inlet.

Only captive fasteners are useddown-stream of final filtration.

Evap CoolerModule

Donaldsons Evaporative Cooler fits neatly behindany of the Donaldson air inlet filters -- in this caseits downstream of a GDX self-cleaning filter.

Evaporative Cooling

XLR, GDX, GDS, Spider-Web, Duratek, and Pleatloc are tradenames of the Donaldson Company, Inc. Donaldson Company, Inc.reserves the right to change or discontinue any model or specification at any time and without notice. Copyright 2005. Printed in U.S.A.An Equal Opportunity Employer

Cooler Inlet Air Means Higher Turbine OutputOptimizing inlet air temperature increases power output,as the graph below illustrates.

Chiller Coil section being liftedinto place, downstream of thefilter section

The Donaldson chiller coil system beinginstalled will cool the inlet air for a GEFrame 7EA Gas Turbine in the hot, dry desertenvironment near Onaizah, Saudi Arabia.

For exampleFor exampleFor exampleFor exampleFor example, a gas turbine generator with a Donaldson evaporativecooling system installed at a site having an ambient temperature of 100Fand a relative humidity of 30% could deliver up to 7.6% more powerthan a gas turbine without an evaporative cooler. Evaporative coolingtypically can decrease inlet air temperatures by as much as 20 to 30F,depending on the ambient humidity.

The Donaldson evaporative cooler, positioned behind theGDX self-cleaning air filter, reduces inlet air emperaturefor a Siemens Westinghouse 501FC Gas Turbinenear St.Paul, Minnesota, USA.

Copyright 1999, AmericanSociety of Heating,Refrigerating and Air-Conditioning Engineers,Inc. (http://www.ashrae.org)Reprinted by permissionfrom Design Guide forCombustion Turbine InletAir Cooling Systems byWilliam E. Stewart, Jr.,Ph.D., P.E.

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Where to Find Us:Where to Find Us:Where to Find Us:Where to Find Us:Where to Find Us:

EMAIL:filterinfo@donaldson.comgts-europe@donaldson.comgts-asiapacific@donaldson.com

Donaldson Company, IncPO Box 1299, 1400 W. 94th St.Minneapolis MN 55440 USAPhone: 01-952-887-3131

Donaldson Europe, BVBAResearch Park Zone 1Interleuvenlaan 1B-3001 Leuven, BelgiumPhone: +32-16-38-3811

Donaldson Gesellschaft m.b.HPostfach 1251, D 48233Dulmen, GERMANYPhone: +49 25 94 78 10

Office is located in U.A.E.Phone: 00 971-6 7 45-2238

Donaldson Filtration Asia PacificNo. 3, Changi Business Park Vista#02-00, Singapore 486051Phone: +65-6311-7373

Donaldson Australasia Pty. Ltd.Lucca Road, WyongNew South Wales 2259 AustraliaPhone: 61-02-4352-2022

Donaldson Shanghai OfficeRoom 602, IKEA Office Building128 Cao Xi Road, Shanghai 200235Phone: 86-21-5425-3508

Donaldson Far East Ltd.Unit A, B & C, 21/F CDW Bld.388 Castle Peak RoadTsuen Wan, N.T. Hong KongPhone 852-2402-2830

DI Filter Systems Pvt. Ltd.D-44, Gulmohar ParkNew Delhi 110-049 IndiaPhone 0091-124-229-0350

Nippon Donaldson, Ltd.Tachikaw Nishikicho Bldg1-8-7 Nishiki-cho, Tachikawa-ShiTokyo 190-0022 JapanPhone: 81-42-540-4112

Donaldson Korea Company, LtdGranada Place 2F45-5, Samsung-dongKangnam-gu, Seoul 135-010REPUBLIC of KOREAPhone: 82-2-517-3333

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