Cooling towers ВГ-192

Covering, wind partitions, the bridging of the cooling tower
The panels, as well as wind partitions, are made of fiberglass (fiberglass reinforced plastic, δ=2.0 mm) and are fastened to the steel frame with the usage of galvanized steel joints. Design eliminates air leak through thinness of covering. The proposed material (fiberglass reinforced plastic) has high mechanical strength and wear resistance, is not vulnerable to corrosion. The temperature range, in which it is possible to use fiberglass reinforced plastic – from “-70” up to “+120”0C. The covering made of fiberglass panels proved to be excellent in conditions of the environment with high humidity and chemical exposure (the used material is non-flammable, resistant to acids, alkalis, fats, oils, ultraviolet).
Water catcher
	To effectively capture water droplets in the used airflow we offer to install cell water catcher BC-150. This design of water catcher furthers the efficient capture of water and reduces water loss with the entrainment up to 0.007% of the total water consumption for the cooling tower due to 3 time changing of the air flow direction.  It also has excellent aerodynamic characteristics: reduces capacity requirements of the fan and provides additional contribution to increase of the cooling capacity of the cooling tower. The water trapper is made of PVC, which does not support combustion, is resistant to acids, alkalis, fats, oils, ultraviolet.
Water distribution system
The water distribution system of the cooling tower is a collector consisting of the supply and distribution pipes. The nozzles are evenly located on each distribution pipe. The water distribution system of one section of the cooling tower includes 4 feeding collectors Дy 300, to which distribution pipes are connected. To ensure reliable corrosion protection and long life of the water distribution system, we recommend to install the collector made of fiberglass. Advantages of fiberglass water distribution system: - the collector of the fiberglass reinforced plastic has a significantly longer life compared to metal one (the warranty period for fiberglass reinforced plastic pipes – 30 years, while the comparable figure for metal pipes is 5 years); - collector made of fiberglass reinforced plastic does not require corrosion protection and subsequent maintenance work; - high resistance to chemically active substances; - fiberglass reinforced plastic does not support combustion; - no “wandering” flows; - the collector is supplied in unassembled from, which reduces transport costs; - it is assembled by means of flange connections, which provides the possibility of its checkup and cleaning;
- the coefficient of roughness of fiberglass pipes is much less than that of the ferrous metal pipes, in result, the flow capacity of fiberglass pipe is not reduced with time (the inner surface of the pipe is practically not blocked); - lightness of fiberglass reinforced plastic pipes substantially reduces the complexity of installation, which consequently reduces the time and cost of the works; - fiberglass pipes have good acoustic absorption, therefore, transmission of noise caused by flow of water through pipes is limited;        For even flow distribution and efficient aerodynamic mode, the spray nozzles of dynamic type with cup-shaped reflector are used. They are made from polypropylene.        These nozzles have a direct water output channel, which significantly reduces the risk of clogging with impurities, which are in the water. The design of the nozzle (the cup-shaped reflector) increases the time of contact of water with air in over irrigation space that will reflect well on the overall cooling efficiency of the cooling tower.        The design of the water distribution system of each section provides the complete discharge of water at the output after usage.
Irrigator
To ensure high cooling efficiency, the cooling tower will be equipped with a combined irrigator, consisting of corrugated PVC sheets of film irrigator and net blocks. The film irrigator with cross-corrugated channels furthers improvement of water distribution by splitting the water flow. The water flow is splitted at least ten times as it passes over the surface of irrigator. The square of the heat-mass exchange of film irrigator under low specific load on the support structure significantly exceeds the same indicator of other types of irrigator. Specially designed corrugating, designed microstructure and high standards of manufacture allow to achieve high thermal efficiency with minimal pressure loss. Features and benefits of film irrigator made of PVC: - improved distribution of water; -  high resistance to contamination; - special additives for high resistance to UV radiation; - high efficiency of heat dissipation; - special edges for directing the water on both sides of the sheet; - the irrigator is made of PVC material, which does not support combustion (in accordance with the Standard 136 of Cooling Technology Institute CTI). The water distribution net blocks are installed on top of the film irrigator. This decision improves the water distribution in the irrigation space, accelerates the formation of a thin film of water and protects the irrigator from directional non sprayed water flow in case of failure of the nozzle.
Fan installation
Each section of the cooling tower equipped with fan installation ВГ-70, which consists of a diffuser, impeller and electromotor. The diffuser of the fan installation is made of laminated fiberglass, has a stream-lined inlets, where there is a minimum clearance between the edges of the blades and the housing of the diffuser. The height of the diffuser is determined by calculation and can vary within 2.1 3.5 m.  The diameter in the area of impeller rotation is 7050 or 8050 mm. The advanced systems of design analysis and application of digital production technologies ensure perfect circle in the area of impeller rotation. The multilayer structure of the diffuser has a specially designed system of stiffener plates; due to this it has light weight and high strength. A hatch is provided for access the fan. The cooling towers of ВГ series are equipped with 3,4-or 5-blad impeller with diameter of 6990-8000 mm. The blades of the impeller are made of epoxy resin reinforced with glass fibre (fibreglass), with corresponding values of spin and cone ratio for maximum airflow. All blades are manufactured with the same moment of the mass to allow replacement of individual blades without the need of re-balancing, i.e. each blade can be mounted individually. The fixing elements are made of stainless steel. The fiberglass impellers have a considerable number of advantages in comparison with aluminum blades and, especially, with carbon steel: - high corrosion resistance both chemical and mechanical; - the possibility of forming a complex profile of the blade, which provides better performance; - high class of dynamic balancing of impellers – 6.3 G; - low specific gravity of the material; - reduction of noise and vibration; - reduction of starting currents of the electromotor; - less time-consuming installation works; - longer service life due to the use of corrosive resistant material. For drive of the fan installation impellers, the electromotors of leading European manufacturers with optimally matched power in a sealed air-cooled design with special insulation for cooling towers are used. The cooling towers of ВГ series are equipped with 75 or 90 kW electromotor of АСВО5К-75 (90)-32У1 brand. The electromotors of АСВО5К brand are asynchronous with squirrel-cage motors, vertical ones are designed for gearless direct drive of axial fans. The single-speed motors brand АСВО5К are equipped with bearings, which make replenishment of the lubricant possible in the operation without disassembling the motor. The estimated durability of the bearings is not less than 70 000 hours. In the lower end shield of the motor there are plugs for condensate draining. The motor start is direct and is performed at nominal circuit voltage as well as at the voltage reduced during start-up to 0.8 Unom. Speed control is possible with ЧП in the range from 10 to 50 Hz Degree of protection of housing and terminal box: IP55. Class of insulation of stator windings: F. Installation execution: IМ9631 (vertical, shaft up). Cooling method: ІСА0141 - external air cooling by cooling tower fan. Motors of АСВО5К brand are equipped with: - vibration sensor; - temperature sensors of the upper and lower bearings with a nominal static characteristic of the РТ -100, output signal 4-20 mA; - temperature sensor of winding (posistor), the output signal is “dry contact”; - anticondensation heating system (ТЭН - 2pcs.). The use of electromotors of АСВО5К brand in set with frequency converter allows to operate these motors in a power range 40÷100%, allowing a more accurate selection of optimal power/speed of the electromotor depending on the required cooling capacity.