Cooling limit of circulating water
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Theoretically, the cooling limit temperature for industrial circulating cooling water is the local wet-bulb temperature; however, due to various factors such as cooling towers, the actual cooling limit temperature is generally several degrees higher than the local wet-bulb temperature. I saw someone say that, in fact, the cooling limit is generally the local wet-bulb temperature plus 4°C. I would like to ask: by how many degrees is the temperature of the cooling water used in circulating water systems (mechanically ventilated cooling towers) usually higher than the local wet-bulb temperature? In particular, cases where the design of the circulating cooling tower is excellent and its operation and management are also good.
It seems what you said is more or less correct. I have a set of data here: For the design of recirculating water systems, local meteorological data is generally used – wet-bulb temperature τ=27.8°C, dry-bulb temperature θ=32.2°C, and atmospheric pressure P=0.1014 MPa； The temperature difference between the inlet and outlet of the circulating water station is △t=10℃, within the range of (32–42℃). I’m not sure if this is useful to you. \"Code for Design of Industrial Circulating Cooling Water Treatment\" (GB. 50050-2007) \"Code for Design of Industrial Circulating Water Cooling Systems\" (GB. 50102-2003)
The design of cooling towers also takes their cost into consideration; theoretically, it is possible to approach the local wet-bulb temperature as closely as desired, but such towers would be extremely expensive to construct. Choosing the most economical circulation rate and a reasonably appropriate watering density achieves a balance between investment and efficiency.
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