Cooling towers are heat rejection device which rejects waste heat to the atmosphere through the cooling of the water stream to a lower temperature. Common applications include cooling the circulating water used in food and beverage manufacturing, oil refineries, petrochemical and other chemical plants, thermal power stations and HVAC systems for cooling buildings.
Dry Cooling and Bacteria
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 or, in the case of closed circuit dry cooling towers, rely solely on air to cool the working fluid to near the dry-bulb air temperature. Cooling towers can scale up and corrode due to the repeated use of water, and if left untreated, the warm, dirty water they can contain and will encourage bacteria to grow, and Legionnaires’ disease can be the fatal consequence.
Water treatment is used to optimize the cooling process so that operating costs and risks are reduced.Highly treated recycled water may be an effective means of reducing cooling tower consumption of potable water, in regions where potable water is scarce. Besides treating the circulating cooling water in large industrial cooling tower systems to minimize scaling and fouling, the water should be filtered to remove particulates, and also be dosed with biocides and algaecides to prevent growths that could interfere with the continuous flow of the water. Under certain conditions, a biofilm of micro-organisms such as bacteria, fungi and algae can grow very rapidly in the cooling water, and can reduce the heat transfer efficiency of the cooling tower. Biofilm can be reduced or prevented by dosing chlorine or other chemicals.
Cooling towers are important in commercial and industrial sites and can also allow for cost savings. There are many industrial and commercial applications that will require a cooling tower to maintain systems. Enviro Concepts offer a wide range of cooling tower water filtration and chemical dosing products, and have the expertise to suggest which of these products would best suit your needs.
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