Temperature control in an open-loop circulating water system
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The total flow rate of the circulating water in our company is 40,000 m3/h, with the temperature of this water being controlled between 28–33°C. The cooling tower fans used have a diameter of φ9144 mm; the motors driving these fans have a power rating of 185 kW and operate at a voltage of 6 kV. In winter, turning one fan on or off can cause a significant change in water temperature of up to 2°C. We were informed that high-voltage frequency conversion technology is not yet fully developed. Are there any other modifications that could help reduce the fluctuations in water temperature? Thank you.
Consider controlling the amount of water fed into the tower; if power savings are not a concern and the fans continue to operate, reducing the amount of water fed into the tower in winter can decrease evaporation and help control the temperature of the circulating water
That’s how it’s done at the moment; I’m not sure if there are any new technologies available for upgrading the equipment. Make the fan operate at different speeds at various water temperatures.
It’s about precise control; I’m looking for new technologies that allow the fan to operate at different speeds at various water temperatures.
Is it possible to change the approach and consider using water volume control with cold equipment? After all, this is more energy-efficient and usually sufficient to meet the requirements.
Three options. One is to use a high-voltage frequency converter directly, from ABB. Second, replace the low-voltage motor with an inverter. Third is to adjust the water flow rate to the upper tower.