OpenStudio Error when using Low Temp Radiant Var Flow- HVAC system, possible bug?

asked 2025-05-12 07:38:55 -0500

Alex89's avatar

updated 2025-05-12 10:43:35 -0500

Hi!

I encountered an error while trying to create a Thermally Activated Building Structure, a TABS System.

I used OpenStudio 3.9 and created a Plant Loop with Low Temp Radiant Var Flow Objects in OS or ZoneHVAC:LowTemperatureRadiant:VariableFlow:Design according to the EnergyPlus Input Out Doc.

When i try to run the system (District Heating & Cooling, SetPoint Manager, Variable Pump) i get the error messages:

   ** Severe  ** <root>[Branch][Plant Loop 1 Demand Branch 2][components][0] - Missing required property 'component_name'.
   ** Severe  ** <root>[Branch][Plant Loop 1 Demand Branch 2][components][0] - Missing required property 'component_object_type'.

image description

When i check the idf-File in the idf editor using the Validity Check Feature the the name objects are alway empty and i cant seem to find the corresponding names.

Is there maybe a Bug where it is currently not possible to use the ZoneHVAC:LowTemperatureRadiant:VariableFlow:DesignObjects due to errors in translating to idf?

Any help would be appreciated! Also if you have any other ideas for creating a tabs system i would like to hear it all! Alex

Edit: Add Pictures showing missing Entrys

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Comments

1

Do you also have a ConstructionProperty:InternalHeatSource and assigned to the constructions that you are using for radiant surfaces? While I am not familiar with the implementation in OpenStudio, EP3 will double-check for compatible radiant prior to creating the EnergyPlus ZonehVAC:LowTemperatureRadiant:VariableFlow object.

kwalkerman's avatar kwalkerman  ( 2025-05-20 01:30:52 -0500 )edit

Hi, yes i believe that was the problem! I fixed it and now i can export without an issue. Maybe there is bug because it isnt giving any error just not exporting the objects at all.

Alex89's avatar Alex89  ( 2025-05-20 12:23:28 -0500 )edit