Set flow direction of radiant floor in Energyplus

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i'm trying to modelling capillary radiant heating floor.

all of tubes have same flow direction.

I want to make the Energyplus modeling the same way because all the capillary oil flows in the same direction.

I think 'ZoneHVAC:LowTemperatureRadiant:ConstantFlow' class in the current Energyplus is impossible make flow

direction same, is there any other way?

Or should I make external programming by python?