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[EnergyPlus_Support] No flowrate in the plant loop. Please help!!



Hi dear forum!

My model has LowTemperatureRadiant:VariableFlow as a zoneHVAC system, and GroundSource HeatPump as a plant with a VariableFlow Pump.
There's no air distribution system except zone airmodel(zone earth tube), thus, no humidity control so far. 
But, the serious problem I have now is that there's zero flowrate in the water-side loop, thus the air temperature of the zone is very high(above 40C). Putting aside the high humidity problem(since there's no control for humidity yet) or lack of cooling capacity,  I can't find the reason why the system doesn't react to the zone load at all.
I've been comparing to other example idf files for plant loop configuration, checked every operational schedules and so on for several days now. It feels like a dead-end..

Please, any advice will be a great help for me!

Thank you in advance!!



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