LPT Cooling Tower
Forced draft centrifugal fans counterflow cooling tower. Executed as per standard with Z-725 (725 g/m² zinc) galvanized steel panels. Applicable for airconditioning and industrial cooling when reduced cooling tower height is required (LP = Low Profile).
An LPT cooling tower is the ideal solution for sound-sensitive installations due to the centrifugal fan with forward curved fan blades to allow static pressure for the installation of sound-attenuators.
The LPT units can be installed indoors due to the compact design and the available static pressure. Ductwork can be added on air-inlet and outlet side. As an option a vertical air-inlet and outlet (TOP-TOP) can be executed.
The LPT cooling tower range is CTI (Cooling Technology Institute) certified in the USA and is complient with the International Building Code (IBC). Evapco Europe provides with each cooling tower a Thermal Performance Guarantee. LPT-units have a maximum nominal capacity of 1.5 MW.
Long-lasting corrosion protection is guaranteed with the Z-725 heavy gauge mill hot-dip galvanized steel (Z-725 = 725 g/m² zinc) casing. The galvanized steel construction withstands the most difficult environmental and operating conditions.
For special applications, Evapco can produce the units with a stainless steel sump, with a water touched stainless steel construction or a full stainless steel execution (AISI 304 and 316 are possible).
- Unit: Open cooling tower
- Models: 43 Models (LPT 316 till LPT 8812)
- Width: 1.029 / 1.540 / 2.388 mm
- Design: Forced draft
- Capacity: 120 till 1.460 kW
- Air Flow: approx. 3,3 till 32,5 m³/s
- Fan: Centrifugal
- Drive: Belt driven
- Low height
- Low sound
- Low Maintanance
- Anti-Fog coils as an option
- Indoor and Top-Top execution possible
The LRT cooling tower range is designed to minimize the cooling tower height. The fan is installed besides the fill section and not underneath it like for the LS-style cooling equipment. Low equipment height is sometimes required for architectural and/or esthetical reasons.
The standard installed forward curved centrifugal fan has a natural low sound emission. Installation of an inlet attenuator will reduce the dominant fan-noise significantly. Additional reductions can be established by installing outlet sound attenuators, these will further reduce the sound emmision of the fan but also of the spray system.
The LPT unit has been designed to satisfy installation requirements where height limits must be observed. The lower profile design of the LPT does not, however, sacrifice maintenance accessibility for reduced height. Its unique casing design allows the water distribution system, cold water basin, fan section and other unit components to be easily maintained. Small, light weight sections of the drift eliminators can be easily removed to access the water distribution system. Large circular access doors are located on both sides of the cold water basin to allow adjustment of the float assembly, removal of the stainless steel strainers and cleaning of the basin. The fan motor and drive system are located at one end of the unit and are completely accessible by removing the inlet screens. Although, routine maintenance can be performed from the exterior of the unit without removing the inlet screens.
Anti-Fog coils as an option
To reduce the typical cooling tower plume during evaporation of warm water in the airflow, an anti-fog coil can be installed on top of the equipment. By heating up the leaving air before it mixes with the ambient air above the cooling tower, plume reduction will result. Evapco can offer 2 or 3-row copper/aluminum anti-fog coils.
Indoor and Top-Top execution possible
Indoor installation often require ducting from the cooling tower to the building. By increasing the motor size of the centrifugal fan, additional external static airpressure can be accepted without thermal performance loss. The standard LP-type unit has a horizontal air intake and a vertical air outlet. If vertical air inlet and outlet is required, Evapco will modify the inlet plenum around the fan to establish the optional Top-Top execution. To avoid recirculation, a section with guiding vanes over the entire surface of the air outlet is included in the Top-Top option.
Warm water from the heat source is pumped to the water distribution system at the top of the tower. The water is distributed over the wet deck fill by means of large orifice nozzles. Simultaneously, air is drawn in by the centrifugal fans inside the fan and drive enclosure and directed upward into the fill casing opposite the water flow. A small portion of the water is evaporated which removes the heat from the remaining water. The warm moist air is discharged to the atmosphere while the cooled water drains to the basin at the bottom of the tower and is returned to the heat source. The vertical air discharge of the LPT 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.
1. Casing and basin design
High Performance drift eliminators
The drift eliminators remove entrained water droplets from the air stream to limit the drift rate to less than 0.001% of the recirculating water rate. The unit 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.
A unique feature of the LPT Cooling Towers are split fan housings. The split fan housing on the LPT allows quick removal of the fans from the front end of the unit. This feature allows fan removal when units are placed side by side where space is minimal.
Z-725 Galvanized steel panels
EVAPCO has developed the ultimate system for corrosion protection in galvanized steel construction - the EVAPCOAT Corrosion Protection System. Z-725 is the heaviest level of galvanizing available for manufacturing evaporative condensers and has a minimum of 165% more zinc protection than competitive designs using Z-275 steel.
2. Heat transfer system
EVAPCO’s patented EVAPAK® fill is specially designed to induce highly turbulent mixing of the air and water for superior heat transfer. The fill sheets are thermally formed into a cross flute design. The individual fill sheets are bonded together to form rigid fill blocks. The fill blocks are then stacked within the unit’s protective casing. The structural strength of the assembled fill pack enables it to be used as a working platform. EVAPCO fill is impervious to rot and decay.
3. Mechanical design
Statically and dynamically balanced galvanized centrifugal fans with forward curved fan blades. The centrifugal fans allow static pressure to be added to the unit for installation of attenuators, anti-fog coils, ducts, etc...
Single speed fan motor
Each Evapco unit is equipped as per standard with a heavy duty, single speed IP55 TEFC / TEAO electrical motor.
4. Water distribution
The water distribution system is made with non-corrosive materials durable ABS plastic nozzles.
Spray-water distribution system
The water distribution system is enclosed and completely protected by the casing panels and drift eliminators. The water distribution system is made with non-corrosive materials including schedule 40 PVC pipe and durable ABS plastic nozzles. The spray branch piping is easily removed and designed with threaded end-caps for easy cleaning. Evapco’s design avoids the problems of biological growth and clogging.
5. Maintenance and inspection
Round access door
The circular access door is provided to allow access to the basin. All float-valve and strainer assemblies are located near the door for easy adjustment and cleaning. ICT units have round doors to allow access in the fan plenum.
6. Operational control
Mechanical water level control
Simple but reliable water level control system with adjustable mechanical floadbal and brass float-valve.