![]() ![]() This will lead to corrosion & scaling problem in the system if COC is not maintained as per design limit. It means as COC increases dissolved solids gets concentrate. Blow down:Īs you know when water evaporates it leaves solids & only pure water evaporates. On other side higher COC increases dissolved solids concentration in cooling tower. It is always advisable to maintain COC as high as possible to reduce make water requirement. The cycles of concentration normally vary from 3.0 to 8.0 depending on the design of a cooling tower. COC = Make up water quantity / Blowdown water quantityįormula#1, is general formula and you can use this formula in any type of water.įormula#2, is normally used to calculate COC of sea water cooling tower.įormula#3, gives you more accurate COC then any other formula if you have flow measurement facility available for makeup & Blowdown water in the cooling tower. ![]() COC = Conductivity in cooling water / Conductivity in makeup water COC = Silica in cooling water / Silica in makeup water You can calculate COC in three different ways. It can be calculated by any of the below formulae. Cycle of concentration(COC):Ĭycle of concentration (COC): It is simply a ratio of the parameters of cooling water to the parameters of makeup water. Induced Draft Cooling Tower: 0.1 to 0.3 * Recirculation Rate / 100Ĭooling Tower with drift eliminator: 0.01 * Recirculation Rate / 100 #10. Natural Draft Cooling Tower: 0.3 to 1.0 * Recirculation Rate / 100 If it isn’t available then you can assume based on below formula. Drift or windage loss of cooling tower is normally provided by its manufacturer based on cooling tower design. It is very difficult to ignore the drift problem in a cooling tower. Theoretically, the evaporation quantity of water is 1.8 m 3 for every 10,00,000 Kcal heat rejected.Įvaporation Loss(m3/hr) = 0.00153 * Recirculation Rate (m3/hr) * Delta T #9. Evaporation Loss:Įvaporation Loss: It is the loss of water from a cooling tower by evaporation. Normally, the circulation rate is measured in m 3/hr #8. It is the flow rate of water which is circulated in the cooling tower. It is the total volume of water present in the whole circuit of the cooling tower including piping & equipment. Cooling Tower Effectiveness:ĬT effectiveness (%) = Range / (Range + Approach) *100 #6. This is the difference between the cooling tower outlet cold water temperature and ambient wet bulb temperature.Īpproach = Cold cooling water outlet – Wet bulb temperature #5. Range or Delta T = Hot cooling water inlet temp – Cold cooling water outlet temp #4. It is the difference between cooling water inlet temperature and outlet temperature. If the humidity is 100% then no evaporation is possible because air is completely saturated with water. Relative humidity simply represents how much moisture could be at a given temperature compared to the actual moisture present in the air. It doesn’t take account of relative humidity in the air. ![]() Wet bulb temperature of a cooling tower is measured by sling psychomotor. Wet bulb temperature is measured by the thermometer which is wrapped in a cloth called soak. Let’s start… Cooling Tower Calculations & Terminologies: #1. In order to understand cooling tower calculations, you need to understand some basic terminology & formulas. ![]()
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