How to set time domain Simscape model to hours instead of seconds?

For my hydraulic isothermic model I model a centrifugal pump installation. Normally, flows and pump capacity characteristics are in m^3/h. However, in the centrifugal pump (IL) block I need to set capacity vector in m^3/s, and it does not recognize me changing it to m^3/h. This makes it more difficult than necessary, as I now need to change all other flow units to m^3/s. I cannot just act like seconds are hours, as I will then get problems with units as rpm (minute).

How do I change the flow to m^3/h?

Answer 1

[DB]

It seems the notation for hours is hr, not h. Therefore, I can change the flowrate from m^3/s to m^3/hr and it works.

Answer 2

[Nikhil Muthakana]

Convert your m^3/h parameters to m^3/s by dividing the m^3/h value by 3600 (since 1 m^3/s = 3600 m^3/h)

[DB]

Yes, that's what I do currently, but I want it all cleanly in hours so I avoid pump curves in m^3/s and avoid other errors. Currently, the pump curves are:

But I want them to be with flow Q in m^3/h:

[Nikhil Muthakana]

The blocks do not have the option of m^3/h (even in the Flow Rate Sensor block), so after converting the simscape physical signals to simulink data signals, use a gain block on the signal with 3600 as the value to convert the m^3/s to m^3/h when you log the flow rate signals. You can name the signals appropriately to keep track of the units.

[DB]

It seems the notation for hours is hr, not h. Therefore, I can change the flowrate from m^3/s to m^3/hr and it works.