They require specialized maintenance to ensure safe, efficient, and reliable operation, including an effective water treatment program. Ozone treatment for cooling towers ozone water treatment. Performance analysis of automated control system for. Best practice guidelines water conservation in cooling towers au 1.
Water treatment for cooling towers 1 of 2 water treatment helps ensure that heattransfer surfaces perform to design specifications by amanda meitz, senior microbiologist, nalco diversified technologies, inc. Treatment and corrosion control of cooling water page 3 section 1 cooling water treatment introduction this document is based on the practical experience of chemical engineers working in the field in the main industrial centres in the united kingdom, from small factory units with cooling systems of a few cubic metres, to. Conversion to recycled water has allowed biogen idec to realize significant cost savings through discounted rates and. To ensure such cooling towers are correctly maintained and operate at optimum efficiency it is essential that the correct cooling water conditions are established and then maintained at all times.
Audit and assessment cooling water pretreatment chemical applications monitoring before effective treatment can be provided, a thorough assessment of conditions in your cooling water system must be made. Best management practice and guidance manual for cooling. An acceptable water treatment program must be compatible with the variety of materials incorporated in a cooling towerideally the ph of the circulating water should fall between 6. The cooling towers at biogen idec are the largest users of water in the facility. Gsa proving ground evaluated an electrochemical water treatment system for cooling towers at the juliette gordon low federal building in savannah, georgia, to test whether the technology could. Chemtreat is the knowledge leader in cooling treatment. Solar water treatment for cooling towers final report prepared for the new york state energy research and development authority albany, ny. A cooling tower water treatment system is an arrangement of technologies that remove damaging impurities from your cooling tower feed water, circulation water, andor blowdown. Safety is a priority both with our chemical treatment programs and the environment. Blow down is a term for water that is removed from the recirculated cooling water to reduce contaminant buildup in the tower water. Dec 19, 2017 cooling towers are recirculating water systems used to remove heat from building air conditioning equipment and industrial processes. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wetbulb air temperature or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near. Earlier, cooling towers were constructed primarily with wood, including the frame, casing, louvers, fill and cold water basin. As the universal solvent, water is capable of dissolving a variety of materials as well as holding.
An acceptable water treatment program must be compatible with the variety of materials incorporated in a cooling tower ideally the ph of the circulating water should fall between 6. Basic cooling water treatment treatment can be divided into four steps. Our field engineers average 16 years of experience with industrial water cooling, providing our customers with the highest level of expertise and service available. What is a cooling tower water treatment system and how does. Dcn59 page confidential 9 of 12 appendix a cooling tower water treatment equipment & chemical list system water treatment controller chemical pump chemical feed chemical use container size. Best management practice and guidance manual for cooling towers. Cooling towers can cycle water numerous times before the water becomes saturated and must be discharged out of the system.
Pdf electrochemical water treatment for cooling towers. Water treatment for cooling towers 1 of 2 email a colleague. Cooling towers can cycle water numerous times before the water becomes saturated and must. So, for our example drift would amount to approximately 1 gpm. Cooling tower calculations cooling water treatment. Cooling tower problems can be very costly, theres the physical cost to repair or replace, productivity loss because of down time, and loss of heat transfer in the the cooling tower. These solids concentrate and increase the scaling, corrosion, and fouling potential of the water. Optimization of water treatment for cooling towers. Understand fully the implications of the control setpoints, feed limit and. Preventive maintenance program and plan for cooling towers.
There are two main sources of cooling water fresh water. Traditional water treatment approaches rely on chemicals to extend the ability of the water to hold scaling minerals in suspension, minimize corrosion and prevent biological growth. 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. The most common type of cooling towers used at power plants are of the wet design elliot, 1989. Sodium chlorite treatment of cooling water with chlorine dioxide.
A basic understanding of the system water distribution shall be established in order to properly operate and maintain a cooling tower on a water efficient manner. From the sump cool water is pumped back to the heat exchanger. Air enters at the ambient condition point a, absorbs heat and mass moisture from the water. Cooling towers contain large amounts of water and are potential breeding grounds for legionella bacteria if they are not properly disinfected and maintained. A psychromehic analysis of the air passing through a cooling tower illustrates this effect figure 2. The tower takes the heat from the water stream and rejects it to. System water treatment is documented with annual certification, quarterly inspections with legionella sampling results, monthly.
Any fouling of the heat exchanger surface by scale, debris. Cqms water treatment employs the latest technologies to provide a costeffective, environmentally friendly solution that answers all of the needs for cooling towers water treatment while saving water and energy, and reducing chemical costs. This can be achieved using carefully selected cooling tower water treatment chemicals. Oct 26, 2016 but what is a cooling tower water treatment system and how does it work. Cooling is accomplished through the latent heat of vaporization. By understanding how cooling tower systems function, facility owners and operators can operate and maintain their systems more. Introduction an open circuit or evaporative cooling tower is a heat rejection device that rejects heat to the atmosphere by cooling a water stream to a lower temperature. Ultrasound application would be expected to minimize the corrosion risk and simultaneously reduce consumption of halogen dosing higher water reuse and recycle trends predominant in the microelectronic industry, prefer alternative treatment like. Treating water for cooling towers is an integral part of the process operations in many industries and is used to minimise water depletion and remove zinc, chromates and carbonate from the water used in cooling towers. In cooling towers with wellengineered mist eliminators, a common design drift rate is 0.
As water evaporates in a cooling tower, dissolved solids and suspended solids remain behind. Cooling tower water treatment prevent scale, corrosion, fouling and microbiological contamination. The corrosion processes that could occur due to a bad cooling water quality may under certain circumstances be local and by. Cooling water treatment and analysing background correct cooling water treatment and followup of the cooling water condition are of utmost importance for keeping the cooling water systems of the engines in good condition. Cooling tower chemical dosing prevents growths that may interfere with continuous water flow. The current state of water treatment in gsa buildings is to use conventional chemical based cooling tower water treatment to maintain cooling tower water quality and contract out this specialized service to a thirdparty company specializing in such service.
Water treatment basics learn water treatment process. Opening the controller enclosure exposes user to the risk of electrical shock at power line voltages. Sufficient information is included in this paper for a water treatment engineer to design, manufacture, and apply scale and corrosion control remedies throughout a wide range of conditions. Basic cooling tower terms types of towers important properties of water system calculations factors that limit cycles of concentration system concerns treatment options overview cooling towers are an integral component of many refrigeration systems, providing comfort or process cooling across a broad range of. Cooling towers other uses of water healthy water cdc. Ozone treatment for cooling towers new energy and water saving technology to reduce cooling tower operating costs abstract the use of ozone as a maintenance treatment for cooling towers has good potential for operation and maintenance savings in the federal sector. Technical reference for water conservation in cooling towers. Ultrasound for cooling water application ozone water treatment. Today, manufacturers are using a variety of materials to construct cooling towers. Cooling system treatment treatment of cooling systems has two basic objectives.
741 1191 95 1028 1454 1 507 795 921 1422 210 464 573 868 405 1383 648 501 271 626 357 215 954 78 1290 715 35 1285 1477 908 801 627 321 1211 284 1495 907 764 1396 545 67 1444 698 1498