Radiant Variable Flow

Elliot_Glassman · August 9, 2019, 6:42pm

Developing an HVAC system with Radiant variable flow panels. I get the following two severe errors which cause the simulation to fail:

** Severe ** ZoneHVAC:LowTemperatureRadiant:SurfaceGroup flow fractions do not add up to unity for ZONE HVAC LOW TEMPERATURE RADIANT VARIABLE FLOW 1CEILINGS
** Severe ** ZoneHVAC:LowTemperatureRadiant:SurfaceGroup = ZONE HVAC LOW TEMPERATURE RADIANT VARIABLE FLOW 6CEILINGS does not have any surfaces listed.

Any idea how to ameliorate these errors? Is there a need/way to specify surfaces in the model for the radiant surface?

minggangyin · August 10, 2019, 2:02am

@Elliot_Glassman Maybe you should follow this example created by @chris.
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Custom_Radiant_Heating_Cooling_System

MingboPeng · August 10, 2019, 2:31am

@Elliot_Glassman in @chris’ example, it shows you how to create a construction with radiant surfaces, and this method has already tested with Ironbug, which also will help to automatic fix radiant construction issue in multi-floor buildings.

github.com

MingboPeng/Ironbug/blob/master/src/Ironbug.HVAC/IB_HVACSystem.cs#L124


        var osmPath = OpenStudio.OpenStudioUtilitiesCore.toPath(opsModelFilePath);
        var optionalModel = OpenStudio.Model.load(osmPath);


        if(optionalModel.is_initialized()) model = optionalModel.get();
    }
    
    return model;
}


//This is due to how HB sets up the this type of construction
private static void CheckInternalSourceConstruction(OpenStudio.Model model)
{
    var tempM_o = model.getMaterialByName("INTERNAL SOURCE");
    if (tempM_o.isNull()) return;
    var tempM = tempM_o.get();
    var handle = tempM.handle().__str__();


    var tempCName = string.Empty;


    foreach (var item in tempM.sources())
    {