Marley MD - Cooling Towers
Overview
For decades, SPX Cooling Technologies has been a leading producer of counterflow cooling towers for large industrial installations. Today we’re bringing the technology down to size… with the new Marley MD Cooling Tower.
The Marley MD is a packaged counterflow cooling tower. Available as both Factory Assembled or Field Erected, the Marley MD has a smaller footprint while providing comparable capacity as a crossflow cooling tower. This induced-draft counterflow tower is ideal for applications with restricted site conditions and/or low energy requirements.
Features
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- CTI Certified
- ASHRAE 90.1 compliant
- OSHA compliant
- Low noise "L" configurations
- Single inlet piping
- Rugged G600 galvanized steel (G235 in the Americas) is standard with 300 series stainless steel as an optional upgrade to part or the entire tower structure
- Triple-pass inlet louvers and drift eliminators that conserve water and improve winter operation
- 5 year mechanical warranty
Available:
Worldwide
Related Information:
- Marley MD Brochure
- Marley MD Engineering Data and Specifications
- Marley MD Installation, Operation and Maintenance
- Field Installation Manual MD5008 and MD5010
- Field Installation Manual MD5016
Counterflow towers have different footprints from crossflow towers and offer layout alternatives. Where space is limited or otherwise restricted, the counterflow’s smaller footprint can be a perfect fit. In addition to taking up less site space, counterflow towers may have a lower installed weight. Plus, piping costs can be reduced since a single inlet is usually standard.
The counterflow’s tight louvers prevent sunlight from hitting the collection basin reducing algae growth. Counterflow towers also offer easy access from all tower sides. The wet surface is enclosed for winter operation and protection from environmental elements. It has all of this and a corrosion-resistant spray system, too.
Low Energy Consumption
Induced draft counterflow equipment minimizes the energy consumption by providing a lower fan energy requirement than centrifugal fan counterflow units. And being remarkably energy efficient, it doesn’t waste a single kilowatt.
Superior Water Management
To reduce “splash-out” typically found in competitive counterflow designs, Marley introduces an industry first: a triple-pass inlet louver that conserves water and improves winter operation.
Smaller Footprint
Induced draft counterflow design requires less plan area than crossflow towers. And typically because the tower’s size results in less steel used, its reduced weight requires less support structure.
Long Life Construction
Rugged G600 heavy mill galvanized steel (G235 in the Americas) is standard with 300 series stainless steel as an optional upgrade to part or the entire tower structure. Marley ISO certified plants assure quality factory-assembly.
Low-Noise
The Marley MD comes standard with our low-noise fan, suitable for most noise-sensitive situations.
Unmatched Reliability
Heavy-duty construction, high-performance design, and our five-year mechanical warranty ensure consistent, fully rated cooling over a wide range of flow and temperature requirements.
Ease of maintenance
Marley has worked hard to address the maintenance difficulties long associated with counterflow towers. Our MD tower provides larger access doors and other features that simplify maintenance.
What makes the Marley counterflow tower better?
- Triple-pass inlet louvers and drift eliminator for superior splash-out protection and water conservation
- SPX’s position as “sole source supplier” for all configurations of cooling towers and fluid coolers
- Marley Geareducer option, offering a five-year, no-oil-change interval
Air Movement Package
- Eased inlet fan cylinder ensures full area, low turbulent airflow through the cylinder.
- High efficiency fan wide-chord design for maximum efficiency at low fan tip speeds.
- New Nozzle Design allows for complete coverage without alignment dependency.
- Marley PowerBelt™ an industry-leading drive, all aluminum sheaves, easy belt replacement and 100,000-hour bearing life.
- TEFC Fan Motor 1.15 service factor, variable torque, and specially insulated for cooling tower duty for extended life.
- Removable fan guard welded heavy gauge rods. Hot dip galvanized after fabrication.
- The MD air movement package including the structural support the guaranteed against failure for a period of five full years. The motor is warranted separately by the motor manufacturer.
Water Distribution System
- Single water inlet and outlet designed to have the right connections for your application.
- Pressurized spray distribution system is self-balancing and designed for a range of flows.
- Marley NS7 polypropylene nozzles deliver precise distribution of water over the fill area. Grommet style nozzles make replacement easy and are not alignment dependent.
- Marley MC thermoformed PVC film fill is assembled in blocks for easy removal and cleaning and is usable as a walking surface.
- Industry First Triple Pass Louvers and Eliminators that limit drift losses to no more than .001% of the design flow rate. Less louver “splash-out” than that typically found in competitive counterflow designs.
Structure
- Counterflow configuration provides a fully encased fill design inhibiting ice formation.
- Steel Construction G600 (G-235 in Americas) heavy mill galvanized steel construction standard. Series 300 stainless steel optional.
- Factory assembly ensures hassle-free installation. On site assembly is available.
- Easy Access from all four sides of the cooling tower allows entry at any point of the basin.
Quality Parts
- High Efficiency Axial Fan Adjustable-pitch fan blades permit the maximum utilization of rated horsepower and optimal tower performance.
- Fan Motor TEFC 1.15 service factor, vertical-shaft motor designed to Marley specifications for cooling tower duty. Specially insulated for humid cooling tower service.
- SofTork Coupling absorbs excessive shock loads at start-up—forgives minor misalignment between the motor and Geareducer when selected as an option.
- Five-Year Mechanical Warranty - Five-year total mechanical equipment warranty including mechanical equipment support, plus our exclusive 5-year maintenance-free System 5 Geareducer.
Popular Options
- Mechanical Access Door Platform - steel structure and bar-grating attached to and supported by the tower.
- Control Systems - ranges in sophistication from standard fan starters and disconnects to Programmable Logic Controllers that work in conjunction with your building or process system.
- Variable Speed Drive - provides the ultimate in temperature control, energy management, sound control and mechanical equipment longevity.
- Solid State Water Level Control Package - monitor basin water level with solenoid-valve water makeup. Configurations include makeup along with high and low water level alarm and cutoff and electric basin heater cutoff.
- Stainless Steel Collection Basin - all collection basin parts exposed to the circulating water, including structural members projecting into the basin, plus attaching hardware, and all basin options, including sumps, are heavy-gauge series 300 stainless steel. Galvanized steel tower option.
- Electric basin heater - a stainless steel electric immersion heater employs a magnetic contactor and solid-state circuit board to help prevent freezing during cold weather.
- Sound attenuation - baffles can be installed across the length of the air outlet opening. All baffles are contained within a self-supporting steel box. Splash attenuation is also available.
Air2Air™ - Wet-Dry Hybrid Cooling
Overview
Reduce your cooling tower water consumption up to 30 percent annually with Air2Air™ water recovery technology.
Features
Details:
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Available:
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Air2Air is a fully integrated system that operates more reliably than coil-based systems. By using a series of PVC heat exhanger packs in the tower plenum, ambient air condenses much of the moisture before it exits the tower.
The system can be installed on a single cell, or an entire tower, depending on the required water return rate. It is also available both for existing and new cooling towers.
Challenges
Water scarcity is a problem. Many industries face serious operating constraints from a lack of water resources. These industries lose millions in revenue in lost production and suffer from increasing water costs each year. Many power plants are finding it more difficult to get approval for plant expansions, solely because of a lack of water.
Solutions
SPX scientists and engineers have developed a simple and effective system for recovering much of the water that is evaporated in a standard cooling tower. Recovered water can be returned directly to the tower basin, or even piped away as a pure water stream for boiler make-up or other plant uses.
Use of this system can allow greater plant production, reduce water consumption and treatment cost, and even replace more costly means of generating pure water. By combining the Air2Air technology with a hybrid, split steam system, steam-plant cooling systems can be optimized to provide the most efficient use of available water resources possible.
Save Water and Save Money
With environmental concerns high than ever, SPX’s Air2Air technology can help you accomplish something concrete and significant — and something that benefits everyone.
Consider this: One large cooling tower fan cell equipped with an Air2Air system can save nearly 270 million 8-ounce glasses of water every year — enough to quench the thirst of every adult in the United States. And that’s only one cell, for only one year.
Annual Water Savings — USA
| 12% | 18% | 21% | 24% | 27% | 30% |
| 345,000 | 515,000 | 600,000 | 685,000 | 770,000 | 865,000 |
Benefits include:
- Simpler hydraulics for simpler operation
- Fewer moving parts, requiring less maintenance
- No freezing concerns
- Visible plume is greatly reduced along with the headaches associated with conventional coil systems and external plume abatement systems
- Less need for costly pure water make-up
- Less chemical treatment
- High-quality condensate available for other uses
- Colder water, less power usage, and lower capital costs compared to ACC Dry Cooling
Hybrid Cell-Type Cooling Tower - Wet-Dry Hybrid Cooling
Overview
The hybrid cell-type cooling tower offers efficient cold water temperatures with reduced visible plume and enhanced water conservation.
Features
Available:
Worldwide
Related Information:
SPX Cooling Technologies has extensive experience designing and constructing hybrid cooling towers globally. Efficient cold water temperatures are achieved with reduced visible plume, similar to dry cooling systems.
Principles of Hybrid (Wet/Dry) Cooling
A hybrid cooling tower functions in principle like a wet cooling tower. An additional dry section installed in the upper part of the cooling tower reduces visible plume by heating wet air coming from the rain zone.
Our engineers and thermo-hydraulic specialists are experienced in the design and construction heat exchangers and the wet cooling equipment to ensure reliable continuous functioning of the cooling tower.
Material of Casing and Structure
- FRP (Fiberglass Reinforced Polyester)
- Concrete
- Wood
Sound Attenuation Options
- Low noise fans
- Droplet impact absorbers
- Sound attenuators
Hybrid Cooling Tower Types
- Cell-type forced draft
- Cell-type induced draft
- Circular cooling tower with forced draft fans — advantages include minimized salt emissions for seawater application and favorable space requirements
Marley MC Fluid Cooler - Evaporative Fluid Coolers
Overview
The Marley MC steel forced draft counterflow fluid cooler is the ideal solution for sound- and space-sensitive applications.
Features
Details:
- OSHA compliant
- Low noise configurations
- Rugged G235 galvanized steel (G600 in Europe/Z600 China) is standard with S300 series stainless steel as an optional upgrade to part or the entire tower structure
- 5 year mechanical warranty
Available:
Worldwide
Related Information:
Low Maintenance
Unlike most forced draft fluid coolers, the Marley MC Fluid Cooler utilizes large access doors for easy entry and exit. In addition this configuration provides easy access to the motors and fans from grade.
Quiet by Design
All Marley MC Fluid Coolers are designed for low sound levels by utilizing centrifugal fans and a fully contained water splash zone. In addition, For those applications where sound is more of a concern than typical, consider air inlet or outlet attenuation for the ultimate in quiet tower operation.
Long Life Construction
Rugged G235 heavy mill galvanized steel (G600 in Europe/Z600 China) is standard with S300 series stainless steel as an optional upgrade to part or the entire tower structure. ISO certified plants assure quality factory-assembly.
Steel Construction
- MC Steel Fluid Cooler use heavy-mill galvanized steel or 300 series stainless steel for high-performance under any operating conditions.
High Performance Inside and Out
- Low-sound forward curved centrifugal fans overcome the static pressure imposed by external ductwork for quiet indoor operation
- Fully-enclosed falling splash zone water area ensures low noise
- Air movement system is belt-driven by means of wedge-belts sized for 150 percent of the nominal power
- Water distribution system includes PVC lateral subsidiary pipes and low-clog polypropylene nozzles
- Low air resistance keeps power consumption to a minimum
- Factory-design tested and rated sound attenuators available for air inlet and discharge
What every premium installation demands
- Low energy consumption
Fluid cooling equipment minimizes the energy consumption of the entire system because it provides lower operating temperatures — saving money while conserving natural resources. -
Low noise
Centrifugal fans, a fully-enclosed falling water area and optional sound attenuation create one of the quietest fluid cooler configurations on the market. -
Smaller footprint
Forced-draft counterflow design requires considerably less plan area than crossflow towers. -
Ease of maintenance
An extra large entry panel makes the interior of the unit easy to access for service and maintenance. For even greater access, the motor and drive are located outside the plenum area near the grade.
Hybrid Circular Tower - Wet-Dry Hybrid Cooling
Overview
Circular hybrid cooling towers are the ideal solution for cooling of higher water flow rates with reduced visible plume.
Features
Available:
worldwide
Related Information:
SPX Cooling Technologies has extensive experience designing and constructing circular hybrid cooling towers. Efficient wet cooling cold water temperatures are achieved with reduced visible plume similar to dry cooling systems. The special advantages of a circular cooling tower is the elimination of recirculation effects, the reduction of operating costs plus the combination of hybrid cooling with higher water flow rates.
Principle of Circular Hybrid Cooling Towers
A hybrid cooling tower functions in principle like a wet cooling tower. An additional dry section installed in the upper part of the cooling tower reduces visible plume by heating wet air coming from the rain zone.
The fans for the wet section are arranged around the circumference of the cooling tower shell at ground level. At the dry section the fans are located above the wet level in front of the heat exchangers. The hyperbolic shell achieves a natural draft effect which supports the fans of both sections. Therefore the power consumption is reduced.
Elimination of the Recirculation Effects
For cell-type cooling towers the recirculation effect needs to be considered with regard to the thermal performance as well as to the plume-free operation. As the plume of the circular cooling tower is conducted by the higher shell, the recirculation effect is eliminated.
Reduction of Operating Costs
As the natural draft effect supports the fans the power consumption is reduced. Considerably lower operating costs are achieved especially by the application of two-speed motors.
Salt Water Application
The higher rise of the plume results in a wider dispersion. That means for seawater application the salt particles are also better distributed in the air and the resulting salt concentration on the ground is considerably reduced. SPX has special experience with the component design and the selection of materials suitable for saltwater application.
Space Requirements
The recirculation effect need not to be taken into account for circular cooling towers therefore the space requirements are reduced. Also the circular shape is more favorable in comparison to cooling tower cells located in defined distances.
Natural Draft - Cooling Towers
Overview
SPX Cooling Technologies has more than 100 years experience designing and constructing natural draft cooling towers up to 200m / 655’ in height.
Features
Available:
Worldwide
