What are the reasons for high pressure differences in parallel circulating water systems?
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Our company has a circulating water treatment station that supplies water to two separate systems. One of these systems is located at a higher elevation, while the other is at a lower elevation, with a slope of 2 meters. The pressure in the main pipe supplying circulating water to the higher-elevation system is 0.45 MPa, while the return water pressure is 0.20 MPa. The parameters for the system at the lower elevation are roughly the same as those of the main pipe. However, in the system at the higher elevation, the pressure in the main pipe supplying circulating water is 0.2 MPa, and the return water pressure is 0.15 MPa. This results in poor heat exchange efficiency in the equipment of this system, severely affecting its normal operation. What causes this phenomenon, and how can it be resolved? Additionally, the main pipe for circulating water in the higher-elevation system is a 159mm diameter pipe; could it be that this pipe is too small, leading to insufficient flow of circulating water? I would appreciate any advice from those with more experience. Thank you!
The conditions you mentioned cannot solve the problem you’ve raised; sufficient conditions are required. At present, I can only say that the difference in elevation is not a major issue, but factors such as pipe diameter and water consumption play a role. Therefore, just specifying the diameter of one side of the pipes will not solve the problem, nor will specifying the diameters of both sides. It is also necessary to know the flow rate, pipe length, layout of the piping system, and the height of the heat exchanger, among other things.
What if we reduce the water supply to the low-lying areas? If the water pressure in the higher areas remains low, could it be that there is too much resistance in the pipes there? Combined with the difference in elevation, this results in a loss of pressure; in that case, it’s necessary to use a pump with a higher flow rate