Some news about the 570L/h mystery.
Mail from Laing :
Quote:
Hi David
Now it gets a little bit difficult for me to explain the “mystery” about our pump curves, even because I’m not a technician.
The curves that you measured are correct, but our curves are correct too. That is to trace back to the fact that we use different test facilities and test methods.
To get the max. flow at no resistance, you have to compensate the resistance of the measuring facility itself. Also you have to use a second pump in the system to neutralise the system resistances. If you work accordant to this process, you will measure also the 570l/h, as we did it.
If you compare some duty points of the actual curve and the former curve you won’t find too many differences.
David, I hope I could clarify the differences in the measuring methods, even if I have the opinion that we will not work in the area of 5 to 15 kPa, because the resistance of the coldplates, the tubes and other components of the cooling system will be higher. What`s your opinion?
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It could be 2 DDC in parallel and 570L/h could be the result, but it's a strange method again... I ask him some pics/diagrams of their test bench to have more precise info because he don't know really the procedure as he said...
Thoughts?