The problem of circulating water temperature rise in water cooler
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When installing a water cooler, what is the appropriate temperature rise of circulating water? What is the basis?
The inlet water temperature is generally around 30°C, which varies slightly due to different local conditions. The outlet water temperature should be less than 45°C to prevent structural damage. The specific values must be designed according to the circulating water volume, flow rate, heat transfer, etc. according to the process.
We require the temperature difference between the entrance and exit to be greater than 10 degrees Celsius!
Generally, the export is calculated as 10 degrees higher than the import.
It depends on your process requirements, mainly the temperature of the supply water. Generally, the return water should not be above 45 degrees. The supply water is also related to the temperature.
During the design process, regional differences and time differences must be considered. Generally speaking, the temperature may be higher in summer and the heat exchange effect is not good. In winter, the temperature is lower and the heat exchange effect is better. However, the maximum difference is plus or minus 5 degrees. Generally, it is 30 degrees near the water, and the outlet water cannot be higher than 45 degrees.
Determine the water temperature rise by looking at the temperature of the medium being cooled. The higher the medium temperature, the greater the water temperature rise. Since many medium temperatures are not very high, most of the water temperature rise is between 5-10°C.
There should be no fixed requirements for the water temperature difference. The design value is also just a reference.
I think there are two points to consider when it comes to the temperature rise of circulating water. First, it is determined based on the salt content in the water. If the temperature of the circulating water rises too high at this time, it will lead to the formation of dirt. On the other hand, the cooling capacity of the cooling tower should be considered. If the temperature rise is too high and the cooling tower cannot cool it down, the process requirements will not be met. The allowable temperature rise of the cooling water is sometimes related to the structure of the heat exchanger.
The temperature rise of the circulating water of the water cooler, that is, the temperature difference between the inlet and outlet water of the circulating water is determined by many factors. Such as the flow rate and temperature of the medium to be cooled, and the flow rate and temperature of circulating water. The flow rate and temperature of the two media determine the size selection of the cooler. Generally, the outlet water temperature should not be too high, mainly to prevent the cooler from scaling and affecting heat transfer.
We all calculate based on the 10-degree temperature difference between the import and export.