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Multizone model fails if `CoolerOn` has different settings for different zones

Created by: marcusfuchs

Describe the bug In multizone building models like AixLib.ThermalZones.ReducedOrder.Examples.Multizone , each zone can have active cooling or not, depending on the value of CoolerOn in the zone records. If all zones have CoolerOn set to the same value (i.e. all true or all false) the model works. But when setting some zones to CoolerOn = true and others to false, the model fails with the following message:

Failed to expand connect(multizone.TSetCool, multizone.zone.TSetCool);

Found in class AixLib.ThermalZones.ReducedOrder.Multizone.BaseClasses.PartialMultizone, C:/git/AixLib/AixLib/ThermalZones/ReducedOrder/Multizone/BaseClasses/PartialMultizone.mo at line 229, and used in component multizone.

Expansion failed for heterogeneous array caused by conditionally removed variables.

To Reproduce In AixLib.ThermalZones.ReducedOrder.Examples.Multizone, simply change

  AixLib.ThermalZones.ReducedOrder.Multizone.Multizone multizone(
    buildingID=1,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
    VAir=33500,
    ABuilding=8375,
    ASurTot=12744.27,
    numZones=5,
    zoneParam={AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office()},
    redeclare package Medium = Modelica.Media.Air.SimpleAir,
    T_start=293.15,
    zone(ROM(extWallRC(thermCapExt(each der_T(fixed=true))), intWallRC(
            thermCapInt(each der_T(fixed=true))))),
    internalGainsMode=1)
    "Multizone"
    annotation (Placement(transformation(extent={{32,-8},{52,12}})));

to

  AixLib.ThermalZones.ReducedOrder.Multizone.Multizone multizone(
    buildingID=1,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
    VAir=33500,
    ABuilding=8375,
    ASurTot=12744.27,
    numZones=5,
    zoneParam={AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(CoolerOn=true),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office(),
        AixLib.DataBase.ThermalZones.OfficePassiveHouse.OPH_1_Office()},
    redeclare package Medium = Modelica.Media.Air.SimpleAir,
    T_start=293.15,
    zone(ROM(extWallRC(thermCapExt(each der_T(fixed=true))), intWallRC(
            thermCapInt(each der_T(fixed=true))))),
    internalGainsMode=1)
    "Multizone"
    annotation (Placement(transformation(extent={{32,-8},{52,12}})));

I can also upload a branch with a demo example

Expected behavior The model should simulate successfully even if some zones have cooling and others don't

Desktop (please complete the following information):

  • Dymola 2020x

Additional context I think it would be good to include at least one example with at least 1 zone with active cooling in the unit tests to make sure this is covered. If I understand the existing code correctly, there is no example with CoolerOn = true in the library