LSC-E Evaporative Condenser

Principle of Operation

The refrigerant is circulated through the coil of evaporative condenser. Heat from the refrigerant is dissipated through the coil tubes to the water cascading downward over the tubes. Simultaneously, air is forced upward, over the coil opposite the water flow by the fans. A small portion of the water is evaporated which removes the heat. The warm moist air is discharged to the atmosphere while the cooled water drains to the basin at the bottom of the condenser where it is recirculated by the pump up through the water distribution system and back down over the coils. The vertical air discharge of the LSC-E design and the distance between the discharge air and the fan intake reduce the chance of air recirculation since the warm humid air is directed up and away from the unit. For detailed layout information, please consult EVAPCO’S Equipment Layout Guidelines.

Low Sound Design

Centrifugal fan units provide an inherently low noise characteristic which makes this design preferred for most installations that require low sound levels. The sound they produce is predominantly in the high frequencies which is easily attenuated by building walls, windows, and natural barriers. Additionally, since the sound from the fans is directional, single sided air entry models can be turned away from critical areas avoiding a sound problem. When even quieter operation is necessary, centrifugal fan models can be equipped with optional sound attenuation packages. Consult the factory for details.

Thermal-Pak II® Coil

EVAPCO's Thermal-Pak II ® coils feature a patented design which assures maximum cooling capacity. The airflow through the coil is counterflow to the fluid flow, providing the most efficient heat transfer process. A special coil design is utilized to reduce the air pressure drop through the unit while maximizing tube surface area and increasing its heat transfer capabilities. The uniquely shaped tubes of the coil are staggered in the direction of airflow to obtain a high film coefficient.
The coils are manufactured from high quality steel tubing following the most stringent quality control procedures. Each circuit is inspected to assure the material quality and then tested before being assembled into a coil. Finally, the assembled coil is pneumatically tested at 400 psig (2758 kPa) under water to ensure it is leak free.

To protect the coil against corrosion, it is placed in a heavy steel frame and then the entire assembly is dipped in molten zinc (hot-dip galvanized) at a temperature of approximately 800°F (427º).

Pressurized Water Distribution System

EVAPCO's Zero Maintenance ZMII® Spray Nozzle remains clogfree while providing even and constant water distribution for reliable, scale-free evaporative cooling under all operating conditions. The heavy duty ABS ZMII® Spray nozzles have a 32mm diameter opening and a 32mm splash plate clearance. Furthermore, the fixed position ZMII® nozzles are mounted in corrosion-free PVC water distribution pipes that have threaded end caps. Together, these elements combine to provide unequaled coil coverage and scale prevention, and make the industry's best performing non-corrosive, maintenance-free water distribution system.

Efficient Drift Eliminators

An extremely efficient drift eliminator system is standard on the LSC-E Evaporative Condenser. The patented design incorporates three changes in direction of the air and removes entrained water droplets from the air stream limiting the drift rate to less than 0.001% of the recirculating water rate. With a low drift rate, the LSC-E Evaporative Condenser saves valuable water and water treatment chemicals. The LSC-E Evaporative Condenser can be located in areas where minimum water carryover is critical.

The drift eliminators are constructed of an inert polyvinyl chloride (PVC) plastic material which effectively eliminates corrosion of these vital components. They are assembled in sections to facilitate easy removal for inspection of the water distribution system.

Forged Bearing Journal

The fan shafts used on all LSC-E models are standard with forged bearing journals. The competition’s design utilizes a two-piece fan shaft with welded end journals that is susceptible to rusting and eventual failure. The solid forged design of the LSC-E fan shaft provides durable long-lasting operation, free from premature mechanical failure.

Fast, On-Time Shipments

The LSC-E is a completely factory assembled evaporative condenser manufactured by a dedicated professional workforce, expert in building evaporative condensers. Factory trained mechanics and EVAPCO's strict quality control and inspection procedures guarantee the quality of every unit shipped.
EVAPCO's controlled factory environment ensures fast on-time shipments, allowing the LSC-E to be available WHEN THE CUSTOMER WANTS IT!

IBC Compliant

What is IBC?
   
The International Building Code requires that evaporative cooling equipment must meet the same seismic or wind load forces as the building to which they are attached.

How does it apply?
   
Based on project zip code and site design factors, calculations are made to determine the equivalent seismic "g force" and wind load on the unit.

What does EVAPCO offer?
   
Standard Structural Design:  Projects with ≤ 1.0g seismic or 7kPa wind loads
   
Upgraded Structural Design: Projects with > 1.0g seismic or 7kPa wind loads
   
The upgraded structural design package for the New LSC-E is designed for 5.12g and 7kPa.

Stainless Steel Strainers

One other component of evaporative cooling equipment which is subject to excessive wear and corrosion is the suction strainer. EVAPCO provides a lasting Type 304 stainless steel strainer on all units (except remote sump applications) as standard. Strainers are positioned around a large anti-vortex hood in easily handled sections.

Thermal-Pak II ® Coil

EVAPCO's Thermal-PakII® coils is designed to assure maximum cooling capacity. The airflow through the coil is counter to the fluid flow, providing the most efficient heat transfer process. A special coil design is utilized to reduce the air pressure drop through the unit while maximizing tube surface area and increasing its heat transfer capabilities. The uniquely shaped tubes of the coil are staggered in the direction of airflow to obtain a high film coefficient.

The coils are manufactured from high quality steel tubing following the most stringent quality control procedures. Each circuit is inspected to assure the material quality and then tested before being assembled into a coil. Finally, the assembled coil is pneumatically tested at 400 psig (2758 kPa) under water to ensure it is leak free.

To protect the coil against corrosion, it is placed in a heavy steel frame and then the entire assembly is dipped in molten zinc (hot-dip galvanized) at a temperature of approximately 800°F (427ºC).

Note: Closed circuit coolers should only be used on sealed, pressurized systems. Continual aeration of the water in an open system can cause corrosion inside the tubes of the cooler leading to premature failure.

EVAPCOAT Construction

G-235 Hot-Dip Galvanized Steel Construction

The standard material of construction for evaporative cooling equipment for many years has been hot-dip galvanized steel. The purpose of galvanizing is to protect the base metal from corrosion, and the thickness of the galvanized layer directly affects the equipment life.

EVAPCO has been instrumental in the development of corrosion protection technology and was the first manufacturer to use G-235  galvanized steel construction. The G-235 designation equates to a minimum of 2.35 ounces of zinc per square foot of surface area.

The EVAPCOAT Corrosion Protection System is the heaviest galvanized coating available for extended corrosion protection eliminating the need for costly, unreliable epoxy paint finishes.

Easy Access

The pan/fan section of a centrifugal fan unit is designed for accessibility and maintenance. Fan and drive components are positioned to allow easy adjustment and cleaning. All grease fittings are in convenient locations for periodic lubrication. Large circular access doors are provided on each section to allow entry into the pan. All float valve and strainer assemblies are located near the door for easy adjustment and cleaning. The pan sump is designed to catch the dirt accumulated and can be flushed out with a hose.

Fan Motor Mount

EVAPCO mounts the fan motor in a convenient open area to make it easy to adjust belt tension, lubricate the motor, electrically connect it, or change the motor is necessary. The fan motor and drive are under a protective cover for safety purposes and to protect them from the elements.

Fan Motors

All LSC-E Evaporative Condenser models utilize heavy-duty totally enclosed (T.E.F.C.) fan motors designed specifically for cooling tower applications. In addition to the standard motors provided on each evaporative condenser, EVAPCO offers many optional motors to meet your specific needs, including:

• Premium Efficiency Motors
• Multi-Speed Motors

The TEFC motors are mounted horizontally in convenient open area for easy routine service and under a protective cover in the dry entering air stream.

Forged Bearing Journal

The fan shafts used on all LSC-E models are standard with forged bearing journals. The competition’s design utilizes a two-piece fan shaft with welded end journals that is susceptible to rusting and eventual failure. The solid forged design of the LSC-E fan shaft provides durable long-lasting operation, free from premature mechanical failure.

Belt Drive

The belt drive system consists of multigrooved V-Belts with high lateral rigidity. The belts are designed for evaporative condenser service, and are constructed of neoprene with polyester cords. The belt drive is sized for 150 percent of the motor nameplate horsepower ensuring long and trouble free operation.

Centrifugal Fans and Drives

The LSC-E features forwardly curved centrifugal fan wheels constructed of hot-dip galvanized steel for strength and efficiency. All fans are statically and dynamically balanced and mounted in a hot-dip galvanized steel housing designed and manufactured by EVAPCO. The drive sheaves are located in the dry entering air stream for longer life and are accessible from the side of the fan and drive enclosure.

304 Stainless Steel Coil

The EVAPCO manufactured Stainless Steel Coil is an elliptical tube, continuous return bend, 304 stainless steel coil. It is available in both the Thermal Pak Coil design used on AT, LR and LS coolers and condensers and in the patent pending SensiCoil design used in the ESWA.

Sound Attenuation

Centrifugal fan units provide an inherently low noise characteristic which makes this design preferred for most installations that require low sound levels. If the standard LSC-E sound pressure level is not quiet enough for certain applications, the sound levels can be further reduced by adding fan intake and discharge sound attenuators. EVAPCO also recommends the use of Variable Frequency Drives (VFD) or two speed motors for reduced fan speed when operating at less than design load for additional noise reduction.

Fan Inlet Attenuation

Reduces sound radiated through the air intake. It consists of baffled panels to change the path of the air entry and to capture the radiated noise, thus reducing the overall sound levels generated. The attenuator is self-supporting and does not require structural steel support.

Discharge Attenuation

The discharge attenuation hood features a straight sided design with insulated baffles to reduce the overall sound levels of the discharge air. The discharge attenuator incorporates a large access panel to allow entry to the drift eliminators and water distribution system. If a higher discharge velocity is required, a tapered discharge hood that provides minimal sound attenuation is available.

Electric Water Level Control

EVAPCO evaporative condensers are available with an optional electric water level control system in place of the standard mechanical makeup valve and float assembly. This package provides very accurate control for the basin water level and does not require field adjustment, even under varying operating conditions.

The control was designed by EVAPCO and is manufactured exclusively for EVAPCO. It consists of multiple heavy duty stainless steel electrodes. These electrodes are mounted external to the unit in a vertical stand pipe. For winter operation, the stand pipe must be wrapped with electric heating cable and insulated to protect it from freezing.

The weather protected slow closing solenoid valve(s) for the makeup water connection is factory supplied and is ready for piping to a water supply with a pressure between 25 and 50 psig (138 kPa and 345 kPa).

Stainless Steel Basin

For additional corrosion protection, several stainless steel options are available in either type 304 or for extreme applications, type 316 stainless steel. The LSC-E’s modular design allows specific areas to be enhanced from the cold water basin, to water touch panels, up to the entire unit. Combined with EVAPCO’s non-corrosive eliminators and water distribution system, this is the most effective extended corrosion protection available. Unlike costly, unreliable epoxy paint finishes, stainless steel will not peel or bubble exposing the base metal and clogging the suction strainers.

Screened Bottom Panels

Protective inlet screens are provided on the front of the fan section on the LSC-E. Screens are not provided on the bottom of the fan section since most units are mounted on the roof or at ground level. If units are installed in an elevated position, bottom screens are recommended for safety protection.

Other Options

• Pony Motors
• Ladders
• Stainless Steel Fan Shafts
• Tapered Discharged Hoods
• Solid Screened Bottom Panels
• Hot Water or Steam Coils
• Steam Injectors
• Vibration Switches
• Remote Sump Configuration
• A.S.M.E. Condensing Coils
• Motors– Energy Efficient / Inverter Duty / 2S/1W and 2S/2W / Mill and Chem Duty Automotive Duty

Many More, Consult the Factory

Extended Surface Coil

Evaporative condensers can be provided with spiral fins on the heat exchanger coil to increase the dry performance of the unit. Dry performance is accomplished by rejecting heat to the atmosphere without the use of the spray pump and the evaporation process. Dry operation can be practical in cold climates and/or when reduced winter loads exist. The number of fins per inch and and quantity of rows finned can be varied to obtain different dry performances.

Electric Heaters

Electric immersion heaters are available as an option and are located in the basin of the condenser. They are sized to maintain a +40° F (4,4º C) pan water temperature at 0°F (-18º C) ambient with the fans off *. They are furnished with a thermostat and low water protection device to cycle the heater on when required and to prevent the heater elements from energizing unless they are completely submerged. All components are enclosed in rugged, weather proof enclosures for outdoor use. Heater control packages that include contactor, transformer or disconnects are available.

(*) - Electric heater selection based on 0°F (-18º C) ambient temperature. For alternate low ambient heater selections consult the factory.