Recent content by Chano

Yes it should be independent of the exterior pressure. We said atmospheric pressure because we though that the fluid pressure at the moment the circuit was first time filled would be the atmospheric pressure at the location where it is filled (let´s say, 1 bar). The later changes in the height...

Hi Lnewqban, can I ask you about NPSHa in closed systems? From our previous analysis we think that the pressure on the suction side should always be the static pressure (atmospheric pressure) and NPSHa would be Patm - Pvapor, which is independent of the friction.

Thank you very much, Lnewqban, we were worried about the project and after your help, things became clearer!

I see, if the pressure is uniform, there will be no flow at all. On the other hand, I do realize that the head loss through the pipes is actually negligible compared to the pressure drop in coils and valves. And I think I was interpreting the centrifugal pump curve wrong, the pump performance...

Sorry about not being clear. I would like to know if the gauge pressure is the same in every part of the system (if we can neglect dynamic pressure because the fluid velocity is about 3 ft/s). Or it depends on the part of the system where you place the pressure gauge. Here´s a simple scheme of...

I thought that maybe due to the closed nature of the system, the static pressure would be uniform in the system, guess I was wrong. I am curious about the pressure at the inlet of the pump in the case where a too powerful pump is selected and the static pressure it adds is higher than the loss...

kind of, it´s head versus flow rate. From my understanding, the head or equivalent pressure is the resistance that the pump has to overcome. The lower the head (resistance), the higher the flowrate (mass flow). here´s an example

I would definitely say so, since there is no phase transition and there is a pump and some pipes.

How can we control the pressure of the water inside a closed loop system (chiller system for example)? Let´s say, we have a pump curve and an system resistance curve that can be modified (through opening or closing some valves) In everywhere, what I see is that the intersection of the system...