Ti – To = water temperature difference from tower top to tower bottom in ☌ ( cooling tower inlet hot water and outlet cold water temperature difference)Ĭp = specific heat of water = 1 kcal/kg / ☌ (or) 4.184 kJ / kg / ☌ Blowdown Loss Lambda = Latent heat of vaporization of water = 540 kcal/kg (or) 2260 kJ / kg or This means T 1 – T 2 = inlet water temperature minus outlet water temperature (☏), with 0.00085 being an evaporation constant.Įvaporation loss can also be expressed by using this formula: Evaporation loss is as simple as it sounds just water loss due to evaporation. Next, you have to consider evaporation losses when it comes to water in the cooling tower. Drift loss is considered a function of drift eliminator design and is considered to be:ĭrift loss (D) = 0.3 to 1.0 percent of circulating water (C ) for a natural draft towerĭrift loss (D) = 0.1 to 0.2 percent of circulating water (C ) for a typical induced draft towerĭrift loss (D) = about 0.0005 to 0.001 percent or less of circulating water (C ) for a cooling tower with high-efficiency drift eliminators Evaporation Loss One of the types of loss is drift loss in a cooling tower or windage. There are several different types of water loss experienced depending on the tonnage of a cooling tower, and these all must be calculated to find your makeup water calculation. Knowing water loss also lets you know how much makeup water needs to be added and your annual water costs. Gauging how well the cooling tower is performing and its efficiency is important, so performing a cooling tower evaporation loss calculation is one of the important parameters operators should be aware of. Smaller cooling towers are used in other settings as well, such as schools and hospitals. An industrial cooling tower is a vitally important part of HVAC operations in larger industries, such as chemical plants and industrial power plants.
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