Closed cooling circulation system
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I designed a closed-loop cooling system with five pumps connected in parallel. The flow rate for each branch is expected to be 65, 65, 65, 65, and 45 L/min respectively; the diameter of the branch pipes is DN25, while that of the main pipe is DN50. The designed pressure for the circulating water is 0.3 Mpa. During actual operation, however, the flow rate of the pumps was significantly lower than the designed values, being 35/25/50/29 L/min respectively. Another branch is not in use at the moment. The operating pressure of the system was measured to be 0.55 Mpa. I wonder if anyone knows what the drawbacks of my design are, and why the flow rate cannot be increased
The diameter of the main pipe is too small; it’s not a match. The parallel flow rate of pumps is not 1+1=2
Parallel operation of pumps to increase flow rate is obvious, and it may also pose safety issues
Could you explain what potential issues might arise in terms of security? Is the equipment damaged?
All pipe diameters are too small, resulting in excessive resistance; the pump cannot reach its optimal operating point, and the flow rate does not increase
Based on my calculations, this problem does indeed exist, which gives me even more confidence; I’ve decided to increase the pipe diameter!