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DesJardins
COOLING TOWER CONSULTING SERVICES
COUNTER
FLOW AND CROSS FLOW COOLING TOWER PROGRAMS
PSYCHROMETRIC PROBLEM SOLVING PROGRAMS
EVAPORATIVE AIR PRE-COOLERS FOR AIR COOLED HEAT
EXCHANGERS
COOLING TOWER CONSULTING SERVICES
Many companies which no longer have the luxury of having an experienced cooling tower engineer on their staff now use our services. Our client list includes some of the most notable engineer-constructor firms in the world, major power producers, refineries, consulting engineers, developers, tower manufacturers, cooling tower repair firms, and industrial and air conditioning users.
Custom developed thermal rating programs
for both counter flow and cross flow towers are used to provide quick, accurate
tower performance predictions. Computerized
standard specifications are adapted to
your unique requirements. It is usually much less expensive to make a computer study than
field tests, and while field testing may tell you what your tower is doing now,
it does not predict what it will do after you make additions or modifications.
Although we are the leading independent expert in cooling tower thermal
performance, we also have 49 years experience
in every aspect of the cooling tower industry from component design of
structures, mechanical equipment, and other tower features to practical
solutions for citing and installing your tower complete with all the controls
and associated equipment.
SERVICES WE HAVE PROVIDED FOR OUR CLIENTS
HAVE INCLUDED:
- Bid analysis and thermal performance evaluations
- Specification preparation
- Inspections
- Review for
thermal upgrade
- Economic
comparisons and evaluations
- Practical
review of project needs
- Confidential
preliminary tower sizing and budget pricing
- Review material
requirements
- Psychrometric,
water conservation, and plume abatement problem analysis and design
- Evaporative cooling process studies
- Designs of cooling
tower and evaporative cooling sections
- Dry and wet
tower economic analysis
- Owner's Representative
to monitor thermal performance test
- Thermal performance tests
SOME EXAMPLES OF THOSE WHO HAVE BENEFITED
FROM OUR SERVICES
- A major power
producer now saves over $300,000 per year because tower performance was
up-graded at the time of replacement.
- A repair
contractor's fill replacement recommendation was changed to get greater
performance for less cost.
- Bid analysis of
many proposals revealed possible performance problems, and material and
design deficiencies were discovered.
- A specification
was developed to encapsulate a failing galvanized steel tower in fire
retardant fiberglass, saving the client over $250,000.
- A thermal
performance rating program was developed for a major cooling tower repair
firm.
- Many
specifications have been prepared for refinery and power plant projects.
- Tower repair
inspections and construction inspection services have been provided for
many projects including specification preparation and thermal performance
improvement review.
- Evaporative air
pre-coolers have been designed and built for air cooled heat exchangers
and turbine air inlet cooling.
- Several turbine
inlet air chilling studies have been made, including formal preparation of
turnkey bids.
- Plume abatement studies and designs have been provided
for several environmentally sensitive projects.
- A complete line
of packaged cooling towers was designed for a foreign company including
drawings for every part, computerized thermal rating system, inspection of
prototype, operation manuals and installation instructions.
- Thermal tests
complete with analysis for energy rebates have been provided for high-rise
office buildings.
- Expert witness data has been provided for attorneys.
- Complete design and operational analysis of plume
abated cooling towers located in noise and vibration sensitive areas.
A
COMPLICATED COOLING TOWER
The design of the tower
shown above included the following:
- Cooling tower thermal performance assessment and design for a 1.3
MW cogeneration central plant retrofit to a 1,000,000 + square foot office
building.
- Design parameters for an architectural enclosure and layout to meet
existing building space and structural requirements including visual and
environmental concerns.
- Plume abatement coil design including by-pass dampers and control
system designed to use external heat source for plume abatement and also
for emergency heat load dump from the plant generator engine to the coils
when the absorption chiller is not in operation. Coils and dampers per API design
requirements with conservative fouling factors.
- Fans provided with VFD and controls to assure proper air velocities
in the wet section if coil dampers are open or closed. Control system requirements were
developed for plume control for all expected atmospheric and load
conditions.
- Mechanical equipment selected for noise control to meet city
ordinance.
- Vibration isolation of each 2-cell tower. One tower is over an auditorium.
- Piping and valves, and equalization piping designed for hydraulic
water balance between the cold water basins of both towers for various
combinations of cell operation.
- Fiberglass tower structure and casing with all welded stainless
steel cold water basin.
- PVC fill and drift eliminators selected for design conditions and
water quality.
- Fire sprinkler system to meet local codes.
- Redundancy of cells and considerations for reliability for
different weather conditions, heat loads, and number and types of
turbines, engines and chillers running.
PAGE DOWN FOR DATA ON COOLING TOWER AND
PSYCHROMETRIC PROGRAMS
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INDUSTRIAL QUALITY FOR
AIR
COOLED HEAT EXCHANGERS
GAS TURBINES
INDUSTRIAL BUILDINGS
Evaporative air pre-cooling can significantly
decrease your initial capital costs, operating costs, and in some cases allow
you to do what otherwise would be impossible. Standard air cooled heat
exchangers operate on the dry bulb temperature as the lowest temperature sink
for disposal of heat. By using evaporative sections in advance of the air
cooled exchanger it is possible to reduce the dry bulb to near the wet bulb
temperature by evaporating moisture into the air stream, thus either reducing
the amount of surface required, reducing the operating temperature, or
increasing the number of hours you can operate at the design dry bulb
temperature. Often the use of an air
cooled heat exchanger with evaporative air pre-cooling sections can be used
where a cooling tower that requires much more year-around water supply would
preclude the building of a plant.
EVAPORATIVE
EFFICIENCY AND PRESSURE DROP
CUSTOM OPTIMIZED FOR YOUR SPECIFIC SITE CONDITIONS AND EQUIPMENT
NO WATER CARRY OVER
Air cooled heat exchanger applications are
designed for air velocities which do not require drift eliminators. Gas turbine inlet applications are designed
with securely fastened drift eliminators
All welded stainless steel frame
PVC pipe manifolds and fittings
Stainless steel air inlet screens
Munters Glasdek or Celdek media
0.1 to
0.5 inches w.g.
We will custom design structural attachment beams
and channels, flashings, doors, piping, fans, pumps, valves, flow meters, water
treatment equipment package with controls and filter, winter by-pass louvers
and freeze protection, etc. to meet the specific needs of your project. Special attention is given to making each
part accessible for maintenance.
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BLOW-DOWN FITTINGS BALANCE VALVES
DOUBLE DISTRIBUTION PADS FLOW
METERS
WEST COAST ENGINEER:
"We investigated several installations and this is the best we
have seen."
CONSTRUCTION MANAGER:
"WE INSTALLED 40 SECTIONS IN ONE DAY"
OVER
47 YEARS OF EXPERIENCE WITH EVAPORATIVE COOLING EQUIPMENT
EVAPORATIVE COOLING WITH FOGGING NOZZLES
We provide design, consulting
and supply (though one of our associate companies) of evaporative cooling
fogging nozzle systems for large air cooled heat exchangers. These installations require about the same
design parameters as listed above for wet surface sections, but the cooling
efficiency is limited to about 50% to assure all the water is evaporated. Two distinct advantages are no additional
pressure drop and no start-up time required.
The designs usually include high pressure pumps, required RO water
supply, and controls. Nozzles are high
technology to provide very fine fog droplets that are staged to evaporate in
only 2 to 4 feet from the nozzle, thus minimizing or eliminating wetting of the
surrounding structure, fans and coils.
The first cost of this type of system is generally less than wet surface
sections, but wind effects can affect the operation, and the parasitic pump
power is higher.
PSYCHROMETRIC PROBLEM
SOLVING PROGRAM
Much more than just a data point look-up
tool.
Use it to quickly and accurately step
through your process, changing the pressure as you go, as actually happens in
the real world, combine air streams, add or remove heat, and quickly solve
evaporation or condensation problems. Solve
psychrometric and heat transfer problems for
air pollution control scrubber systems, HVAC, chemical processes, evaporative
cooling with just a few key strokes. No more
having to read a single pressure chart until your eyes pop out.
- Combine two air
streams using three different types of input.
- Given two known
streams - find the combined stream properties.
- If the first
and final streams are known - find the missing stream.
- Second stream
flow is a percentage of the first stream - find results.
- Add or remove
heat from an air stream.
- Find the
sensible and latent heat added or removed when given two known points.
- Given a
starting point, add or remove latent and sensible heat from an air stream.
- Given a
starting point and "Cooling Efficiency", solve evaporative
cooling problems.
Condensation and evaporative heating or
cooling calculations are made easy. The
amount of water added or condensed is calculated. Flow entry can be in CFM or
pounds of dry air or pounds of mix. The
psychrometric program calculates the properties of moist air at any elevation
to 20,000 feet and for pressures to 35 psia. Temperature range is from -80oF to 2,000oF.
The Mol Weight and Specific Heat can be
revised to allow calculations of properties of other moist gases (such as flue
gases). Hot gas scrubbing calculations
are made easy.
- The program
uses four different pressure input modes: altitude, psia, inches mercury
or inches water gage absolute.
- Nine different
property input modes are possible: dry bulb - wet bulb; dry bulb -
relative humidity; wet bulb - humidity ratio; enthalpy - humidity ratio;
dry bulb - humidity ratio; dry bulb - enthalpy; wet bulb - relative
humidity; enthalpy - relative humidity; and humidity ratio - relative
humidity.
- Given any two
of the above properties and a pressure, the other properties are
calculated along with three different specific volume options, the dew
point temperature, three vapor pressure options, and the density of the
mix.
Easy use:
The program saves your last results or inputs to save you time in going
to the next portion of your problem.
Extensive error warnings help keep you from obtaining false results. You
can add notes to your print-out to explain your process or project. Results can
be saved to a file for import to a spread sheet or other program for further
calculations.
COUNTER
FLOW AND CROSS FLOW COOLING TOWER
THERMAL
PERFORMANCE PREDICTION PROGRAMS
An example of Output from Counter Flow
Cooling Tower Thermal Performance Prediction Program. The program includes a built in estimator and help function
guidelines for practical tower design parameters. It is all you need to know to check the size
of a cooling tower design or make an
economic evaluation.
COUNTER FLOW COOLING TOWER CHECK RATING PROGRAM
CALCULATE MECHANICAL DRAFT TOWER PERFORMANCE: Included are data
for the most commonly used new tower fans, fills and eliminators. Also included are data for many old fills and
other components so you can thermally analyze existing towers. What used to take hours now takes seconds.
OBTAIN ACCURATE PREDICTIONS: Use either standard Cooling Tower Institute performance
theory (Merkel Theory) or an advanced
theory which has built in hot water correction
and adjusts for other traditional inaccuracies that might lead to an undersized
tower.
ANALYZE YOUR BIDS: Be a
knowledgeable buyer. Although the
Cooling Tower Institute recommends you test your tower after it is installed to
be sure it was designed and built as expected, towers often do not get tested. You can add a degree of protection by checking the predicted performance before you buy.
EASILY INVESTIGATE ALTERNATE OPPORTUNITIES: Study alternate tower configurations, estimate the power
evaluated cost, or find the best way to up-grade. Use the cost estimator to
investigate the optimum use of fan and pump power as compared to installed
capital cost. Use the help screens to be
sure the design is within normal design parameters for good air and water
distribution, minimum drift and windage losses. Predict performance at high altitude.
ASK
US. If you have a cooling tower
question, send us e-mail. We will answer it.
MEMBER COOLING
TECHNOLOGY INSTITUTE
DesJardins
COOLING TOWER CONSULTING SERVICES
RICHARD J. DESJARDINS
1471 LA LOMA DRIVE
SAN MARCOS, CA 92078
Telephone & FAX: 760-304-4282 Cell phone: 760-641-4264
e-mail
us: coolingtower@roadrunner.com
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