modelElectrical
Model of the electrical room attached to test cell X3A
Extends from Buildings.ThermalZones.Detailed.MixedAir (Model of a room in which the air is completely mixed).
Information
This is a model for the electrical room connected to test cell 3A in the LBNL User Facility. Other models are provided for the main space of the test cell and the connected closet. This documentation describes the wall constructions used in the electrical room model. For documentation describing how the room models are to be connected to develop a model of the entire X3A test cell see Buildings.ThermalZones.Detailed.FLEXLAB.Rooms.X3A.
There are 4 different wall sections described in the model. They are shown in the figure below.
The different wall sections are entered into the model according to the following table.
| Wall Section Number | Description | Location in Model | Corresponding Layer |
|---|---|---|---|
| 1 | North exterior wall | datConExt[1] | eleExt |
| 2 | East air space connecting to Closet | surBou[2] | |
| 3 | South air space connecting to TestCell | surBou[1] | |
| 4 | West exterior door and wall | Door: datConExt[3] Wall: datConExt[2] |
Door: eleExt Wall: extDooUn |
There are two additional surfaces which are not included in the diagram. One is the model of the roof. It is
modeled in datConExt[4] using the layer roo. The other is the floor, which is modeled in
datConBou[1] using the layer slaCon.
Several of the connections in this model are intended to be connected to specific surfaces in other room models. The following table describes the connections to rooms which are not in the X3A package. The constructions in datConExt are not described in the table because they are connected to the external environment, and no additional heat port connections are necessary. A rationale for why the model is created this way is also provided if it is considered necessary.
| Location in Electrical | Description of External Connection | Rationale |
|---|---|---|
| surf_conBou[1] | Connection to ground temperature model | This port represents the bottom of the floor in the space. It is to be connected to a heat port representing the temperature of the ground. |
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | NConExt (from ConstructionNumbers) | max(1, nConExt) | Number of elements for exterior constructions |
| Integer | NConExtWin (from ConstructionNumbers) | max(1, nConExtWin) | Number of elements for exterior constructions with windows |
| Integer | NConPar (from ConstructionNumbers) | max(1, nConPar) | Number of elements for partition constructions |
| Integer | NConBou (from ConstructionNumbers) | max(1, nConBou) | Number of elements for constructions that have their outside surface exposed to the boundary of this room |
| Integer | NSurBou (from ConstructionNumbers) | max(1, nSurBou) | Number of elements for surface heat transfer models that connect to constructions that are modeled outside of this room |
| Boolean | haveConExt (from ConstructionNumbers) | nConExt > 0 | Flag to conditionally remove components |
| Boolean | haveConExtWin (from ConstructionNumbers) | nConExtWin > 0 | Flag to conditionally remove components |
| Boolean | haveConPar (from ConstructionNumbers) | nConPar > 0 | Flag to conditionally remove components |
| Boolean | haveConBou (from ConstructionNumbers) | nConBou > 0 | Flag to conditionally remove components |
| Boolean | haveSurBou (from ConstructionNumbers) | nSurBou > 0 | Flag to conditionally remove components |
| ParameterConstruction[NConExt] | datConExt (from ConstructionRecords) | Data for exterior construction | |
| Buildings.ThermalZones.Detailed.BaseClasses.ParameterConstructionWithWindow[NConExtWin] | datConExtWin (from ConstructionRecords) | Data for exterior construction with window | |
| Buildings.ThermalZones.Detailed.BaseClasses.ParameterConstruction[NConPar] | datConPar (from ConstructionRecords) | Data for partition construction | |
| Buildings.ThermalZones.Detailed.BaseClasses.ParameterConstruction[NConBou] | datConBou (from ConstructionRecords) | Data for construction boundary | |
| Buildings.ThermalZones.Detailed.BaseClasses.OpaqueSurface[NSurBou] | surBou (from ConstructionRecords) | Record for data of surfaces whose heat conduction is modeled outside of this room | |
| HeatTransfer.Data.OpaqueConstructions.Brick120 | dummyCon (from ConstructionRecords) | Dummy construction to assign a parameter to the instance | |
| Buildings.HeatTransfer.Data.GlazingSystems.SingleClear3 | dummyGlaSys (from ConstructionRecords) | Dummy construction to assign a parameter to the instance | |
| Boolean | homotopyInitialization (from RoomHeatMassBalance) | true | = true, use homotopy method |
| Modelica.Units.SI.Volume | V (from RoomHeatMassBalance) | AFlo*hRoo | Volume |
| Modelica.Units.SI.Area | AFlo (from RoomHeatMassBalance) | Floor area | |
| Modelica.Units.SI.Length | hRoo (from RoomHeatMassBalance) | Average room height | |
| Boolean | linearizeRadiation (from RoomHeatMassBalance) | true | Set to true to linearize emissive power |
| Data.Constructions.OpaqueConstructions.ExteriorConstructions.Construction3 | eleExt | Construction describing the exterior walls in the electrical room | |
| Data.Constructions.OpaqueConstructions.ExteriorConstructions.ExteriorDoorUninsulated | extDooUn | Construction describing the door in the electrical room | |
| Data.Constructions.OpaqueConstructions.Roofs.ASHRAE_901_2010Roof | roo | Construction describing the roof of the electrical room | |
| HeatTransfer.Data.OpaqueConstructions.Generic | slaCon | Construction of the slab | |
| Exterior constructions | |||
| Integer | nConExt (from ConstructionNumbers) | Number of exterior constructions | |
| Integer | nConExtWin (from ConstructionNumbers) | Number of window constructions | |
| Partition constructions | |||
| Integer | nConPar (from ConstructionNumbers) | Number of partition constructions | |
| Boundary constructions | |||
| Integer | nConBou (from ConstructionNumbers) | Number of constructions that have their outside surface exposed to the boundary of this room | |
| Integer | nSurBou (from ConstructionNumbers) | Number of surface heat transfer models that connect to constructions that are modeled outside of this room | |
| General › Ports | |||
| Integer | nPorts (from RoomHeatMassBalance) | 0 | Number of ports |
| Dynamics › Glazing system | |||
| Boolean | steadyStateWindow (from RoomHeatMassBalance) | false | Set to false to add thermal capacity at window, which generally leads to faster simulation |
| Convective heat transfer | |||
| Buildings.HeatTransfer.Types.InteriorConvection | intConMod (from RoomHeatMassBalance) | Buildings.HeatTransfer.Types.InteriorConvection.Temperature | Convective heat transfer model for room-facing surfaces of opaque constructions |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hIntFixed (from RoomHeatMassBalance) | 3.0 | Constant convection coefficient for room-facing surfaces of opaque constructions |
| Buildings.HeatTransfer.Types.ExteriorConvection | extConMod (from RoomHeatMassBalance) | Buildings.HeatTransfer.Types.ExteriorConvection.TemperatureWind | Convective heat transfer model for exterior facing surfaces of opaque constructions |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hExtFixed (from RoomHeatMassBalance) | 10.0 | Constant convection coefficient for exterior facing surfaces of opaque constructions |
| Nominal condition | |||
| Modelica.Units.SI.MassFlowRate | m_flow_nominal (from RoomHeatMassBalance) | V*1.2/3600 | Nominal mass flow rate |
| Experimental (may be changed in future releases) | |||
| Boolean | sampleModel (from RoomHeatMassBalance) | false | Set to true to time-sample the model, which can give shorter simulation time if there is already time sampling in the system model |
| Ports | |||
| Boolean | use_C_flow (from MixedAir) | false | Set to true to enable input connector for trace substance that is connected to room air |
| Dynamics › Zone air | |||
| Modelica.Fluid.Types.Dynamics | energyDynamics (from MixedAir) | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | Type of energy balance for zone air: dynamic (3 initialization options) or steady state |
| Real | mSenFac (from MixedAir) | 1 | Factor for scaling the sensible thermal mass of the zone air volume |
| Initialization | |||
| Medium.AbsolutePressure | p_start (from MixedAir) | Medium.p_default | Start value of zone air pressure |
| Medium.Temperature | T_start (from MixedAir) | Medium.T_default | Start value of zone air temperature |
| Medium.MassFraction[Medium.nX] | X_start (from MixedAir) | Medium.X_default | Start value of zone air mass fractions m_i/m |
| Medium.ExtraProperty[Medium.nC] | C_start (from MixedAir) | fill(0, Medium.nC) | Start value of zone air trace substances |
| Medium.ExtraProperty[Medium.nC] | C_nominal (from MixedAir) | fill(1E-2, Medium.nC) | Nominal value of zone air trace substances. (Set to typical order of magnitude.) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Vessels.BaseClasses.VesselFluidPorts_b[nPorts] | ports (from RoomHeatMassBalance) | Fluid inlets and outlets | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heaPorAir (from RoomHeatMassBalance) | Heat port to air volume | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heaPorRad (from RoomHeatMassBalance) | Heat port for radiative heat gain and radiative temperature | |
| Modelica.Blocks.Interfaces.RealInput[nConExtWin] | uWin (from RoomHeatMassBalance) | Control signal for window state (used for electrochromic windows, removed otherwise) | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a[nConBou] | surf_conBou (from RoomHeatMassBalance) | Heat port at surface b of construction conBou | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a[nSurBou] | surf_surBou (from RoomHeatMassBalance) | Heat port of surface that is connected to the room air | |
| Modelica.Blocks.Interfaces.RealInput[3] | qGai_flow (from RoomHeatMassBalance) | Radiant, convective and latent heat input into room (positive if heat gain) | |
| BoundaryConditions.WeatherData.Bus | weaBus (from RoomHeatMassBalance) | Weather data | |
| Modelica.Blocks.Interfaces.RealInput[nConExtWin] | uSha (from MixedAir) | Control signal for the shading device (removed if no shade is present) | |
| Modelica.Blocks.Interfaces.RealInput[Medium.nC] | C_flow (from MixedAir) | Trace substance mass flow rate added to the room air. Enable if use_C_flow = true | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput[NConExtWin] | HGlo (from MixedAir) | Global solar irradiance | |
| Buildings.Controls.OBC.CDL.Interfaces.RealOutput[NConExtWin] | QTraGlo (from MixedAir) | Transmitted global solar radiation |
Components
Revisions
-
October 13, 2021, by Michael Wetter:
Added missingparameterkeyword.
This is for issue 2669. -
September 16, 2013 by Peter Grant:
Added a model representing the floor. -
July 26, 2013 by Peter Grant:
First implementation.