Simple questions

This post was last edited by ylb913 on 2016-4-23 at 10:00. 1. If the temperature difference between the inlet and outlet water of the cooling water in a heat exchanger decreases, it can be said that the heat exchanger is fouled or that its heat exchange efficiency has declined. If the temperature difference between the inlet and outlet water of the cooling water in a heat exchanger increases, it does not necessarily mean that the heat exchanger is performing well. The tube bundle in a certain area of the heat exchanger may become clogged with scale, or the inlet to that section of the tube bundle may be blocked by dirt; a decrease in the water supply can also cause this issue. ——Ultimately, these two issues need to be determined in conjunction with changes in the water supply volume and the cooling condition of the medium being cooled. 2. The temperature difference for circulating water should not exceed 10 degrees; preventing scaling is certainly one of the factors involved, and this relates to the long-term operation of the cooler. Additionally, a temperature difference of 8 or 10 degrees is specified in the design to ensure proper selection of the cooler; in actual operation, a value slightly above 10 degrees can occur. Finally, it’s likely an issue with the cooling capacity of the cooling tower; such a large temperature difference probably prevents effective cooling.

Consider import and export pressure, temperature, and circulating water flow rate

On the 2nd floor, the answer was very detailed

In addition to considering scaling, the heat exchange capacity of the heater also needs to be taken into account; for example, an excessive amount of cooling water can also result in a too small temperature difference between the upper and lower water streams.

A decrease in the temperature difference between the cooling water inlet and outlet of the heat exchanger indicates that the heat exchange efficiency has declined; of course, this is not necessarily due solely to scaling. Furthermore, if the temperature difference increases, it can no longer be said to be absolutely good – issues such as the proper operation of the equipment, pressure, water flow rate, and so on come into play!

Thank you, teacher. The maintenance is now complete. As the engineer said, for one of the condensers, the temperature difference in the return water of the circulating water system was over 30 degrees. Since it was a newly installed unit, poor water quality and blockages in the tubes were ruled out first; it was suspected that the designed heat load was too low. After carrying out maintenance and taking the unit apart, it was found that a large amount of circulating water filler had blocked the tubes. It is now working normally after cleaning.

Increased simple recirculation water inlet, large-pore filter screen :victory: