We will work with you to develop a customized cooling tower chemical treatment plan that will provide an effective defense against key contamination issues such as biological growth, concentrated mineral content and white rust formation. Cooling tower cycles of concentration cycle of concentration coc ratio of concentration in dissolved solids blowdown vs makeup water typical coc 2. Rp m 2 rp m 1 cfm 2 c fm 1 staticpressure 2 static pressure 1 cfm 2 cfm 12 ho rsep ower 2 ho rsepow er 1c fm cfm 3 formulas ra nge e ntering water tem per ature leavingwater temperature. The inhibitor consists of a chemical compound that added to water lowers the metals corrosion factor.
Rp m 2 rp m 1 cfm 2 c fm 1 staticpressure 2 static pressure 1 cfm 2 cfm 12 ho rsep ower 2 ho rsepow er 1c fm cfm 3 formulas. To the city of portsmouth, new hampshire, herein called the owner. Realize lions share of savings from coc of 3 to coc of 10, savings level off after coc of 15. Eliminating the need for water treatment chemicals for scale, corrosion and biological growth increasing chiller. Operation and maintenance of cooling towers must be in accordance with applicable regulations and bmps outlined in this document. Cooling tower systems operation is most efficient when their heat transfer surfaces are clean. However, due to variations in the water source and their operating in an. The undersigned, as bidder, herein referred to as singular and masculine declares as follows. Modern treatment substances and their properties in. Electrochemical water treatment for cooling towers nrel. Problems of cooling systems and possible solutions of suitable water treatment have been shown. Invitation to bid plainly marked, boilers and cooling towers.
Cooling towers can be split into two distinct categories. Antimicrobials used in cooling water systems general information steam electric facilities using recirculating cooling water systems. Circulate the preq 331 for 12 to 24 hours without a heat load on the tower. A highly instrumentated cooling tower pilot plant was designed and constructed at the dow chemical texas division plant, freeport, texas, for the purpose of developing operating guidelines for fuse of various commercially available nonchromate cooling water treatment programs. Specifically, chemical softening lime or limesoda softening, ion exchange, and reverse osmosis are included. Enter a cooling tower with caution chemical processing. The water is distributed over the wet deck fill by means of large orifice evapjet nozzles. Increasing the cycles of concentration is a very common water conservation measure for cooling towers. A comprehensive cooling water treatment program using. Evoqua offers a broad s election of filtration solutions for cooling systems which will remove suspended solids in the recirculating water stream. When the po4 level in the cooling water has dropped to below 15ppm, the longterm cooling tower treatment program can be started.
The treatment consisted of injection of a single emulsion of filming amines to achieve a residual level of 2 to 2. Technical information for cooling towers using recycled water. Cooling tower water treatment rochester midland corporation. So before we talk about the chemicals used in it, we should know what cooling water tower system is, so that we can understand easier then. Progressive non chemical cooling tower water treatment supports stable system operation, prevents mineral scale, keeps bacteria, biofilm and pathogens under control, and permits cooling system operational practices to inhibit corrosion. Pdf electrochemical water treatment for cooling towers. Two main types of closed water systems are used at many installations. Microbiological control strategy in cooling tower systems. Water flow a checking system for chemical products concentration in water flow is to. Langenhoffb ainstitute for biodiversity and ecosystem dynamics ibed, university of amsterdam, amsterdam, the netherlands.
Cooling is accomplished through the latent heat of vaporization. Cooling tower chemicals what is a cooling tower chemical. We cover popular water treatment topics that include boiler water, cooling water, and waste water treatment. Prior attempts at cleaning the cooling tower system with a variety of biocides, both oxidizing and nonoxidizing, proved ineffective. Cooling tower water treatment the ongoing challenge of all industrial cooling water programs is to provide chemical programs that will maintain clean heat transfer surfaces. Cooling systems use a significant amount of water, requiring reliable treatment.
Maybe some of us didnt know what it is or maybe we even rarely heard about it or even see it. Cooling tower water treatment can be both chemical and physical. The location of the cooling tower and the processes near the cooling tower can greatly affect the propensity for mb activity. Different water filtration systems each offer differing benefits and associated costs. Jake noted that the flow patterns indicated a problem with the old tower. Full hvac training course by ramy ghoraba pdf files. Corrosion is an electrochemical or chemical process that may lead to the. Sodium chlorite cooling water treatment with chlorine dioxide. Drift eliminators are installed to prevent water entrained in the air from leaving the system. Cooling tower chemical water treatment cooling tower. Cooling tower process tower basin distribution deck basin tower fill induced draft fan recirc pump return water supply water a tower cools water by evaporation by drawing high volume air across the water surface, which transfers heat to the atmosphere.
Cooling tower treatment filtration of recirculating water and treatment of tower blowdown to reduce waste is a common concern. 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. Cooling water treatment cooling tower may require these facilities. Effective cooling tower water treatment for new system startup. Score will be awarded for adoption of cooling tower water treatment system with cycles. Invitation to bid plainly marked, boilers and cooling. Side stream filtration for cooling towers prepared for the u. Chardon laboratories is your best source for reliable cooling tower chemical treatment services. Corrosion and scale control chemical formulation is dosed continuously in the sump from dosing tank by dedicated metering dosing pumps. A cooling tower chemical is defined as a corrosion inhibitor and scale prevent chemical and a cooling water biocide. Suezs combination of cooling tower treatment chemicals, software, monitoring and industry expertise can help prevent these issues or aid in the recovery from a failure event. Sufficient information is included in this paper for a water treatment engineer to design, manufacture, and apply scale and corrosion control remedies throughout a. Apr 24, 2017 in addition, there was a history of process chemical leaks in the cooling tower water stream. Bibliography of technical papers cooling tower water.
Oct, 2016 an effective cooling tower water treatment system will provide the right quality of water to your cooling tower, the correct circulation chemistry, allowing it to run efficiently, avoiding problematic deposition, and maintaining a manageable amount of blowdown. This model sow provides details on factors to consider when purchasing chemicals and guidance for preparing purchasing documents. Cycles of concentration coc determines the water chemistry without chemical treatment. Lab result shows existence of legionella more than 1 one c. Chemical treatment of water for cooling and heating systems. Open the cooling tower blowdown at the end of this step to reduce the phosphate level in the cooling water. Preventive maintenance program and plan for cooling. The term induced draft denotes that air is drawn by fans through the flow of falling water and up and out of the cooling tower. Understanding key components of cooling towers and. Understanding the differences in these technologies is necessary for proper selection. Common cooling tower water treatment problems and how to.
A 40,000gal cooling tower chiller system composed of two 1,200ton centrifugal chillers, one 650ton chiller and two cooling towers was selected for the trial. This, in turn, helps conserve the amount of any makeup water or chemicals needed. They needed an immediate solution to clean the tower that was fast, cost effective, and did not require removal and manual cleaning of the towers fill material. In addition, there was a history of process chemical leaks in the cooling tower water stream. Transfer system for transferring formulation into the dosing tank is provided. This would involve applications both to cooling water treatment and boiler water treatment using single pass and recirculating processes. Cooling tower chemical water treatment cooling tower services. Progressive nonchemical cooling tower water treatment supports stable system operation, prevents mineral scale, keeps bacteria, biofilm and pathogens under control, and permits cooling system operational practices to inhibit corrosion. Download full hvac training course by ramy ghoraba four parts in pdf files free hvac tutorial download free mep calculation excel sheets, autocad drawings, and training courses for hvac, firefighting, plumbing and electrical systems design. It can also reduce treatment chemical costs, because when less water is used, fewer. Jake and the area engineer tested the two towers over the next two days and found the old tower missed design by 10f. Oct 26, 2016 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. As the water is reuse the water may become corrosive and the tendency of scaling may increase. Simultaneously, air is drawn in through the air inlet louvers at the base of the tower and travels upward through the wet deck fill opposite the water.
Best management practice and guidance manual for cooling. This means providing protection against corrosion, scale and biological fouling that will ensure continuous operation of equipment with minimal downtime. Preventive maintenance program and plan for cooling towers. What is a cooling tower water treatment system and how does. Warm water from the heat source is pumped to the water distribution system at the top of the tower. Annual chemical new water treatment ro concentrate is typically high in alkalinity, so it is important to either degasify the water or only mix it with soft water to avoid scale. Location 103 industrial drive, waxahachie texas, 75165 972 93809.
Watertreatment and chemical conditioning of open and. Claritys water treatment blog is dedicated to topics having to do with the water treatment industry. What type of cooling tower you have open circulating, oncethrough, or closed loop. 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. Food plants, for example, can contribute plenty of organic compounds for the bacteria to have. When the solids concentration in the cooling tower water is triple that of the makeup water, it is described as three cycles of concentration. Preventive maintenance program and plan for cooling towers utica cfmu00018 r1 printed copies are considered uncontrolled. Cooling tower and heat exchanger efficiencies are of paramount importance in operating any watercooled process found.
Other factors, which we will see, must be stated along with flow rate m3hr. The cooling towers at biogen idec are the largest users of water in the facility. Coc is the number of times the constituents in the raw makeup water is concentrated in a cooling tower as water is evaporated. Standard chemical treatment of pilotscale cooling towers by the addition of free chlorine positive control was able to achieve appreciable reduction in both planktonic 23 orders of magnitude and sessile microbial growth 34 orders of magnitude in these towers. Concerning cooling towers treatment, this prevents the deterioration of water pipes and thus keeping the system efficient. Targets of cooling water treatment in open and closed circuits were pointed out. Each of the treatment concerns can decrease cooling tower performance, increase the use of. Th e treatment consisted of injection of a single emulsion of fi lming amines to achieve a residual level of 2 to 2.
Pdf gsa proving ground evaluated an electrochemical water treatment. The fanlaws can be used topredi ctthe pe rformance ofa towerwitha nonstandard motor. Typical water treatment processes result in 20% to 50% of the water. For legionella emergency disinfection purposes, an initial 50 ppm. What is a cooling tower water treatment system and how. Corrosion, deposition, fouling, and biological growth can derail your operations. Once properly treated, the system water does not form scale and has little or no corrosion potential. F o r m u l a s a n d t a b l es formulasandtables fanlaws.
Water treatment the purpose of a cooling tower is to remove the heat generated by an hvac system cooling of compressor refrigerant and heat generated by the compressor itself. Correct application of chemical treatment programs can eliminate many problems associated with cooling operations. The use of corrosion inhibitor and scale prevent chemicals will allow the cooling tower water reuse to maximize before blowdown. This report of lessons learned has segregated the problems into two major areas. If you have time, please watch some of posted cooling tower videos online. An effective cooling tower water treatment system will provide the right quality of water to your cooling tower, the correct circulation chemistry, allowing it to run efficiently, avoiding problematic deposition, and maintaining a manageable amount of blowdown.
Testing and evaluation of a chemicalfree cooling tower. Cooling towers are an integral component of many cooling systems that provide comfort or process cooling. The hydrex 2000 chemical range is used for water treatment in cooling tower blow down and cooling tower side stream. In open circuit systems the recirculating water returns to the tower after 1 one ton of refrigeration is equal to 12,000 btuhour. Watertreatment and chemical conditioning of open and closed.
Internal chemical and external equipment based treatment possibilities and limitations have been discussed. Chlorine dioxide is also nonreactive with ammonianitrogen and with most treatment chemicals corrosion and scale inhibitors present in cooling water systems. Makeup water water added to the system to replace water lost through evaporation, bleed of and windage recirculation the rate at which water circulates in the cooling tower in m 3 hour litressec. Eliminating the need for water treatment chemicals for scale. Engineering report and the project design documents.
Chardon labs offers cooling tower treatment for new systems with two clear objectives in mind. The paper will focus on the pilot plant as an evaluation. Cooling water treatment cooling tower company in india. Careful consideration should be paid to developing individual chemical, mechanical, and application components to ensure cooling. If the pollutant characteristics of cooling tower effluent meet the prohibited. The startup of a new cooling system is a critical period in its lifecycle. A 40,000gal cooling towerchiller system composed of two 1,200ton centrifugal chillers, one 650ton chiller and two cooling towers was selected for the trial. Makeup water water added to the system to replace water lost through evaporation, bleed of and windage recirculation the rate at which water circulates in the cooling tower in m 3 hour litressec bleed off water deliberately bled from the system to prevent the cooling system water from becoming too concentrated. Technical reference for water conservation in cooling towers pub.
Conclusions table 2 shows the results of the midwestern industrial plants evaluation of their options to save. Use smaller amounts of water than facilities using a oncethrough system based on industry survey data, the average blowdown flow rate was 0. The hydrex 2000 series chemicals from veolia are the ideal cooling tower water treatment chemicals as they improve the efficiency and reliability of open, closed and oncethrough cooling water systems. Water treatment chemicals utilized for cooling tower systems which contain molybdenum are prohibited in the jea sanitary sewer. The specific configuration of your system will depend on several things, including. Range range is determined not by the cooling tower, but by the process it is serving. Specifically, water treatment chemicals, such as chromium, are added to cooling tower waters to protect equipment and piping from corrosion, and to control algae growth in the tower. Biological control in cooling water systems using non. A corrosion inhibitor and scale prevention chemical allows the cooling tower to reuse the water.
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