Filtration Solutions
for Gas Turbines,
Turbines,
Generators, and Compressors
Cooling InletAir ImprovesTurbine Output
Choose Evaporative Cooler or Chiller Coils to Cr eate Higher Mass-Flow Rate
Create
Cooling the turbine inlet air -- GDX self-cleaning Evaporative Chiller Coil System
even by a few degrees -- can filter house with Cooler Module
increase power output substan- inlet hoods
tially. This is because cooled air is
denser, giving the turbine a higher
mass-flow rate and resulting in
increased turbine output and
efficiency -- even as much as 0.4%
per degree Fahrenheit or about
0.7% per degree Celsius. (see
graph on p. 4)
This Donaldson Evaporative Cooler This Donaldson GDX filter system +
Donaldson offers two tried-and- enables this GE Frame 7FA Gas Chiller Coil filters and cools the air for
true inlet air cooling methods: Turbine near Lubbock, Texas, USA, to an Alstom GTX100 gas turbine in the
yield maximum output even during the seasonally hot & humid climate of the
Evaporative cooling and chiller hot dry summer months. upper midwest USA.
coils. The chart at right contains
guidelines for their application.
Which Cooling Method Is Best For YYour
our Site?
Donaldson evaporative coolers
Evaporative Cooler Chiller Coils
and chiller coil systems are
Advantages:
currently cooling gas turbine • Can cool the inlet air regardless
• Economical operation
engines all over the world, from of ambient humidity
• Uncomplicated system
Southern California to Saudi • Can be sized for small or large systems
Arabia -- in hot & arid climates, • Broad range of cooling achievable,
hot & humid climates, and in down to 45F/7C
places with seasonal heat.
Disadvantages:
• Cooling efficiency depends • Need source of chilled water
Designs range in size from 25,000
on relative humidity of • Causes slightly higher ,P than an
cfm to 1,300,000 cfm, and are ambient intake air....high humidity evap cooler does
available with choices in media can inhibit cooling effect
efficiency and materials. • Need source of make-up water
GTS-302
rev 3/01
Chiller Coil System How It Works
Donaldson designs the chiller coil
As airflow passes through the
system as a module that is typically
chilled coils, the air is cooled
positioned downstream of the air
through an indirect heat
filters. This allows the coils, fins A
exchange with the cooling
and parts to stay clean enough to
fluid. The air then passes
function well for many years. On
through drift eliminator B
some systems where this
media and into the turbine.
positioning is impossible or
undesirable for some reason, we
The coils are cold and C
recommend using pre-filters to
therefore condensation is
ensure the cleanliness and
created. Condensate
functionality of the coils.
droplets are directed
downward and collected
For maximum turbine perfor-
in pans, then directed out
mance, the design temperature of
of the system. Typically,
the air leaving the cooling system
all condensation is
and entering the turbine is typically
eliminated this way, but to ensure
no less than 45°F / 7°C. The
air dryness, mist eliminator
ambient air temp and the altitude
panels are in place to remove any
at the site are the major factors
stray condensate droplets.
used in sizing and designing a coil
system. Cooling agents are usually
either water or a water/glycol mix,
Chiller System Components (letters correspond to drawing above)
depending on local ambient
conditions. While Donaldson (A) Access Module: coils cool the airflow to the same
• Provides access so operators can temperature.
doesn’t supply systems containing
check systems functionality and • When moist air is cooled below the
ammonia, we will work with your perform repairs should they be wet bulb temperature, condensation
supplier who does. necessary. forms. Condensate is collected in
• Can be equipped with lights or access stainless steel drip pans and directed
hatches or doors. out of the system.
(B) Chiller Coil Section
Section: (C) Drift Panels:
• Chiller coil tubes are typically made • A final preventive measure, drift
of copper and caged with aluminum eliminator panels prevent any
ì
fins that economically and effectively remaining condensate droplets from
extend the cooling surface area. Coil going into the ducting.
casings are stainless steel for long life. • Moisture removed by the drift
• Supply and return manifolds eliminator panels is drained into the
distribute incoming water evenly to sump at the bottom of the unit.
individual coil headers so that all
The Donaldson Chiller Coil System
typically occupies the space between
the filter house and the transition.
Evaporative Cooler Module (1) & (2)
We generally recommend that the Cooling Media (3) Mist Eliminator
evaporative cooler module be
positioned downstream of the filter
section. Our new, improved design
offers several advantages:
(1) Clean,
Warm Air (4) Cooled Air
• Easier installation: Because of to Turbine Inlet
our exclusive construction design
(patent pending), there is almost no
field welding necessary during
erection. This means faster,
simpler, more reliable installation.
• Solid structural design (patent
pending) minimizes leak-through.
• Fewer mechanical and more How It Works
electrical & electronic controls (1) When the filtered air passes through the saturated evaporative
yield a highly reliable water cooling media, water evaporates off the wet media. This evap-
control system that is much more oration is the process that reduces the air temperature.
sensitive and responsive to water (2) Excess water that does not evaporate is directed downward so as
level needs. not to be carried along with the cooled air.
(3) Cooled air then passes through the integral mist eliminator, where
• Low air pressure drop of 0.3-0.4 leftover water droplets are removed.
inches w.g., or 0.5-0.6 inches w.g., (4) Clean, cooled air is then directed into the turbine inlet.
depending on your media choice.
Donaldsons Evaporative Cooler
• Two coats of epoxy on the Evap Cooler fits neatly behind any of the
Module Donaldson air inlet filters -- in
carbon steel structural members this case its downstream of a
prevent corrosion. Pans and other GDX self-cleaning filter.
components are made of corrosion-
resistant materials.
Hazard Protection
• Little or no water carryover,
thanks to integral drift/mist
eliminators that prevent droplets
from reaching the gas turbine inlet.
• Only captive fasteners are used
down-stream of final filtration.
The Donaldson evaporative Chiller Coil section being lifted
Where to Find Us:
cooler, positioned behind into place, downstream of the website: www.donaldson.com
the GDX self-cleaning air email:
filter section
filter, reduces inlet air
temperature for a Siemens
filterinfo@mail.donaldson.com
Westinghouse 501FC gts-europe@mail.donaldson.com
Gas Turbine near St. gts-asiapacific@donaldson.com.sg
Paul, Minnesota, USA.
Donaldson Company, Inc.
Gas Turbine Systems
ì
P.O. Box 1299
Minneapolis, Minnesota 55440 USA
Phone 952-887-3543
Fax 952-887-3843
Parts/Elements 800-431-0555
Donaldson Europe N.V.
Research Park Zone 1
Interleuvenlaan, 1
B-3001 Leuven, Belgium
Phone 32-16-38-3940
The Donaldson chiller coil system Fax 32-16-38-3939
being installed will cool the inlet air for
a GE Frame 7EA Gas Turbine in the Donaldson Filtration Asia Pacific Pte Ltd
hot, dry desert environment near No. 9, Changi South Street 3, #07-01
Onaizah, Saudi Arabia. Singapore 486361
Phone 65-546-4400
Fax 65-546-4325
Donaldson Far East Ltd.
Unit A, B & C, 21/F CDW Bld.
388 Castle Peak Road
Cooler Inlet Air Means Higher Turbine Output Tsuen Wan, N.T. Hong Kong
Optimizing inlet air temperature increases power output, Phone 852-2402-2830
Fax 852-2493-2928
as the graph below illustrates.
Donaldson Shanghai
Rating Point Copyright 1999, American Unit F2, 6/F
Society of Heating, Zhao Feng Universe Building
59°F
Refrigerating and Air-
Conditioning Engineers,
1800 Zhong Shan West Road
Inc. (http:// Shanghai 200233
1.1 aHR
te
Heat R www.ashrae.org) Phone 86-21-6440-1808
Turbine Capcity
Reprinted by permission Fax 86-21-6440-1639
1.0 from “Design Guide for
Combustion Turbine Inlet DI Filter Systems Pvt. Ltd.
Pow Air Cooling Systems” by
er O D-44, Gulmohar Park
0.9 utp William E. Stewart, Jr., New Delhi 110-049 India
ut Ph.D., P.E. Phone 91-11-124-6337350, 6337351
0.8 Fax 91-11-6569534
0.7 Nippon Donaldson Ltd.
13-2, 5-chome, Imadera
Ome City, Tokyo 198 Japan
40°F 60°F 80°F 100°F Phone 81-428-31-6399
Fax 81-428-31-7076
Compressor Inlet Air Temperature
Donaldson Australasia Pty. Ltd.
Lucca Rd, Wyong, New South Wales
For example, a gas turbine generator with a Donaldson evaporative Australia 2259
cooling system installed at a site having an ambient temperature of 100ºF Phone 61-02-4352-2022
Fax 61-02-4351-2036
and a relative humidity of 30% could deliver up to 7.6% more power
than a gas turbine without an evaporative cooler. Evaporative cooling
typically can decrease inlet air temperatures by as much as 20 to 30ºF,
depending on the ambient humidity.
GDX, 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 2001. Printed in U.S.A.
An Equal Opportunity Employer
