A cooling tower is a heat rejection device that rejects waste heat to the atmosphere through the cooling of a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature.
Water, which has been heated by an industrial process or in an air-conditioning condenser, is pumped to the cooling tower through pipes. The water sprays through nozzles onto banks of material called “fill,” which slows the flow of water through the cooling tower, and exposes as much water surface area as possible for maximum air-water contact.
When the water and air meet, a small amount of water is evaporated, creating a cooling action. The cooled water is then pumped back to the condenser or process equipment where it absorbs heat. It will then be pumped back to the cooling tower to be cooled once again.
In a short summary, the purpose of a cooling tower is to cool down water that gets heated up by industrial equipment and processes. Water comes in the cooling tower hot (from industrial process) and goes out of the cooling tower cold (back into the industrial process).
Types Of Cooling Towers
Cooling towers are designed and manufactured in several types, with numerous sizes available. Understanding the various types, along with their advantages and limitations, is important when determining the right tower for a project. The product list provides an overview of towers to help you determine which is right for your application.
Combined Flow Cooling Towers
Combined flow is the use of both a heat exchange coil and fill for heat transfer in a closed circuit cooling tower. The addition of fill to the traditional closed circuit cooling tower design reduces evaporation in the coil section, reducing the potential for scaling and fouling. Combined flow closed circuit cooling towers utilize parallel flow of air and spray water over the coil, and crossflow air/water flow through the fill.
The process fluid travels from the bottom to the top of the coil, increasing efficiency by bringing the coldest spray water and air in contact with the process fluid at its coldest temperature.In the fill of Combined flow closed circuit cooling towers, air and water interact in a crossflow configuration: water flows vertically down the fill as air flows horizontally across it.
Counterflow Cooling Towers
In a counterflow closed circuit cooling tower design, the flow of the air is in the opposite direction of the spray water. Counterflow closed circuit cooling towers, air travels vertically up through the unit while the spray water travels vertically down over the coil. The process fluid flows from top to bottom through the coil and is in thermal counterflow to the air.
Crossflow Cooling Towers
In crossflow towers the water flows vertically through the fill while the air flows horizontally, across the flow of the falling water.
Because of this, air does not have to pass through the distribution system, permitting the use of gravity flow hot water distribution basins mounted at the top of the unit above the fill.
Special axial flow type fan, with forward tilting blades and streamline cylinder, direct driven no belt. All motors are Siemens or WEG brand,has advantages of compact size, light weight, good start performance, durable and reliable abilities.Compared with same level centrifugal fan system, axial flow type need half motor power only, effectively saves energy.
The spraying water pump designed with high quality non steering restricted mechanical seal, no leakage and long lifespan. Adopt Siemens or WEG brand special outdoor type motors and equipped with imported bearings, which could guarantee its long term operation, low noise, and high performance.
SS304 or Imported Aluminum Zinc Alloy Plate Casing
Besides stainless steel plate, Aluminum Zinc Alloy plate is also available for equipment casing. Aluminum Zinc Alloy plate is one of the plates with strongest corrosion resistant characteristics, and its lifetime is 3 to 6 times of common galvanized steel, with advantages of heat resistance, high temperature resistance, beautiful appearance and so on
The heat exchange coil is made by top quality steel pipe. For closed circuit cooling tower, red copper, stainless steel, and galvanized steel available. For evaporative condenser, stainless steel and galvanized steel selected mostly. And the galvanized steel coil is made by top quality seamless steel pipe, strong pressure resistance. Till now, the biggest operating pressure of coil we designed reach to 30mpa, far more than the competitors level.Various type coil tube available which depends on operating requirements, such like elliptical tube, finned tube, wave tube, compound type coils.
Electric Water Treatment Device
Equipped with advanced water treatment electronic device to antiscale and sterilization by electronic pulse technology, which could effectively prevent coil wall and infill from scaling.Removable Drift Eliminator Removable type drift eliminator, made of high quality PVC material, Special designed structure could effectively collect vapors from wet air, and keep water drift loss rate no more than 0.005%. Removable design is convenient for cleaning.
Advanced Water Distribution System
Large discharge and antiblockage nozzles equipped in water spraying system, which ensures cooling water spraying on coil surface continuously and evenly, make a high efficient heat exchange
between air, spraying water and cooling media. Removable nozzles are easy for maintenance and cleaning.
PVC Fills
Cooling tower fill is one of the most important components for exchange of gas and water in cooling tower. It is the major parts to improve the efficiency of cooling tower and make sure the economic and safe operation.
Cross flow type honeycomb PVC infill, special designed with distinctive big surface area air channel where spraying water flow as a big water film and enlarge water flow time inside of infill, to extend the water cooling effect. And have advantages of small drag coefficient, anti-aging, no easy to deformation.