Buildings.ThermalZones.Detailed.Constructions
Package with models for constructions that are used in the room model
Information
This package contains models for constructions that are used in the room model.Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).
Package Content
| Name | Description |
|---|---|
 Construction
|
Model for an opaque construction that has no window |
 ConstructionWithWindow
|
Model for an opaque construction that has one window embedded in the construction |
 Examples
|
Collection of models that illustrate model use and test models |
 BaseClasses
|
Package with base classes for Buildings.ThermalZones.Detailed.Constructions |
Buildings.ThermalZones.Detailed.Constructions.Construction
Model for an opaque construction that has no window
Information
This model is used to compute heat transfer through opaque constructions inside the room model. The model uses the recordlayers to access the material properties
of the opaque construction. The heat transfer is computed in the instance
opa, which uses the model
Buildings.HeatTransfer.Conduction.MultiLayer.
Extends from Buildings.ThermalZones.Detailed.Constructions.BaseClasses.PartialConstruction (Partial model for exterior construction that has no window).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Area | A | Heat transfer area [m2] | |
| Angle | til | Surface tilt [rad] | |
| Opaque construction | |||
| Area | AOpa | A | Heat transfer area of opaque construction [m2] |
| Generic | layers | Material properties of opaque construction | |
| Initialization | |||
| Boolean | steadyStateInitial | false | =true initializes dT(0)/dt=0, false initializes T(0) at fixed temperature using T_a_start and T_b_start |
| Temperature | T_a_start | 293.15 | Initial temperature at port_a, used if steadyStateInitial = false [K] |
| Temperature | T_b_start | 293.15 | Initial temperature at port_b, used if steadyStateInitial = false [K] |
| Dynamics | |||
| Boolean | stateAtSurface_a | true | =true, a state will be at the surface a |
| Boolean | stateAtSurface_b | true | =true, a state will be at the surface b |
Connectors
| Type | Name | Description |
|---|---|---|
| HeatPort_a | opa_a | Heat port at surface a of opaque construction |
| HeatPort_b | opa_b | Heat port at surface b of opaque construction |
Modelica definition
model Construction "Model for an opaque construction that has no window"
extends Buildings.ThermalZones.Detailed.Constructions.BaseClasses.PartialConstruction
(
final AOpa=A);
end Construction;
Buildings.ThermalZones.Detailed.Constructions.ConstructionWithWindow
Model for an opaque construction that has one window embedded in the construction
Information
This model is used to compute heat transfer through constructions with windows inside the room model.
The model consists of the following two main submodels:
-
The instance
opa, which uses the model Buildings.HeatTransfer.Conduction.MultiLayer to compute the heat transfer through the opaque part of the construction. This model uses the recordlayersto access the material properties of the opaque construction. -
The instance
win, which uses the model Buildings.HeatTransfer.Windows.Window to compute the heat transfer through the glazing system. This model uses the recordglaSysto access the material properties of the glazing system.
The parameter A is the area of the opaque construction plus the window.
The parameter AWin is the area of the glazing system, including the frame.
The area of the opaque construction is assigned internally as AOpa=A-AWin.
Extends from Buildings.ThermalZones.Detailed.Constructions.BaseClasses.PartialConstruction (Partial model for exterior construction that has no window).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Area | A | Heat transfer area [m2] | |
| Angle | til | Surface tilt [rad] | |
| Opaque construction | |||
| Area | AOpa | A - AWin | Heat transfer area of opaque construction [m2] |
| Generic | layers | Material properties of opaque construction | |
| Initialization | |||
| Boolean | steadyStateInitial | false | =true initializes dT(0)/dt=0, false initializes T(0) at fixed temperature using T_a_start and T_b_start |
| Temperature | T_a_start | 293.15 | Initial temperature at port_a, used if steadyStateInitial = false [K] |
| Temperature | T_b_start | 293.15 | Initial temperature at port_b, used if steadyStateInitial = false [K] |
| Glazing system | |||
| Area | AWin | Heat transfer area of window [m2] | |
| Real | fFra | 0.1 | Fraction of window frame divided by total window area |
| Boolean | linearizeRadiation | true | Set to true to linearize emissive power |
| Boolean | steadyStateWindow | false | Set to false to add thermal capacity at window, which generally leads to faster simulation |
| Generic | glaSys | redeclare parameter HeatTran... | Material properties of glazing system |
| Dynamics | |||
| Boolean | stateAtSurface_a | true | =true, a state will be at the surface a |
| Boolean | stateAtSurface_b | true | =true, a state will be at the surface b |
Connectors
| Type | Name | Description |
|---|---|---|
| HeatPort_a | opa_a | Heat port at surface a of opaque construction |
| HeatPort_b | opa_b | Heat port at surface b of opaque construction |
| output RadiosityOutflow | JOutUns_a | Outgoing radiosity that connects to unshaded part of glass at exterior side [W] |
| input RadiosityInflow | JInUns_a | Incoming radiosity that connects to unshaded part of glass at exterior side [W] |
| output RadiosityOutflow | JOutSha_a | Outgoing radiosity that connects to shaded part of glass at exterior side [W] |
| input RadiosityInflow | JInSha_a | Incoming radiosity that connects to shaded part of glass at exterior side [W] |
| HeatPort_a | glaUns_a | Heat port at unshaded glass of exterior-facing surface |
| HeatPort_a | glaSha_a | Heat port at shaded glass of exterior-facing surface |
| HeatPort_a | fra_a | Heat port at frame of exterior-facing surface |
| input RealInput | uSha | Control signal for the shading device, 0: unshaded; 1: fully shaded (removed if no shade is present) |
| output RadiosityOutflow | JOutUns_b | Outgoing radiosity that connects to unshaded part of glass at room-side [W] |
| input RadiosityInflow | JInUns_b | Incoming radiosity that connects to unshaded part of glass at room-side [W] |
| output RadiosityOutflow | JOutSha_b | Outgoing radiosity that connects to shaded part of glass at room-side [W] |
| input RadiosityInflow | JInSha_b | Incoming radiosity that connects to shaded part of glass at room-side [W] |
| HeatPort_b | glaUns_b | Heat port at unshaded glass of room-facing surface |
| HeatPort_b | glaSha_b | Heat port at shaded glass of room-facing surface |
| HeatPort_b | fra_b | Heat port at frame of room-facing surface |
| input RealInput | QAbsUns_flow[size(glaSys.glass, 1)] | Solar radiation absorbed by unshaded part of glass [W] |
| input RealInput | QAbsSha_flow[size(glaSys.glass, 1)] | Solar radiation absorbed by shaded part of glass [W] |
Modelica definition
model ConstructionWithWindow
"Model for an opaque construction that has one window embedded in the construction"
extends Buildings.ThermalZones.Detailed.Constructions.BaseClasses.PartialConstruction
(
final AOpa=A-AWin);
constant Boolean homotopyInitialization = true "= true, use homotopy method";
parameter Modelica.Units.SI.Area AWin "Heat transfer area of window";
parameter Real fFra(
min=0,
max=1) = 0.1 "Fraction of window frame divided by total window area";
final parameter Modelica.Units.SI.Area AFra=fFra*AWin "Frame area";
final parameter Modelica.Units.SI.Area AGla=AWin - AFra "Glass area";
parameter Boolean linearizeRadiation = true
"Set to true to linearize emissive power";
parameter Boolean steadyStateWindow = false
"Set to false to add thermal capacity at window, which generally leads to faster simulation";
replaceable parameter HeatTransfer.Data.GlazingSystems.Generic glaSys
"Material properties of glazing system";
HeatTransfer.Windows.Window win(
final glaSys=glaSys,
final A=AWin,
final fFra=fFra,
final linearize = linearizeRadiation,
final steadyState = steadyStateWindow,
final til=til,
final homotopyInitialization=homotopyInitialization) "Window model";
HeatTransfer.Interfaces.RadiosityOutflow JOutUns_a
"Outgoing radiosity that connects to unshaded part of glass at exterior side";
HeatTransfer.Interfaces.RadiosityInflow JInUns_a
"Incoming radiosity that connects to unshaded part of glass at exterior side";
HeatTransfer.Interfaces.RadiosityOutflow JOutSha_a if haveShade
"Outgoing radiosity that connects to shaded part of glass at exterior side";
HeatTransfer.Interfaces.RadiosityInflow JInSha_a if haveShade
"Incoming radiosity that connects to shaded part of glass at exterior side";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a glaUns_a
"Heat port at unshaded glass of exterior-facing surface";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a glaSha_a if haveShade
"Heat port at shaded glass of exterior-facing surface";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a fra_a
"Heat port at frame of exterior-facing surface";
Modelica.Blocks.Interfaces.RealInput uSha(min=0, max=1)
if haveShade
"Control signal for the shading device, 0: unshaded; 1: fully shaded (removed if no shade is present)";
HeatTransfer.Interfaces.RadiosityOutflow JOutUns_b
"Outgoing radiosity that connects to unshaded part of glass at room-side";
HeatTransfer.Interfaces.RadiosityInflow JInUns_b
"Incoming radiosity that connects to unshaded part of glass at room-side";
HeatTransfer.Interfaces.RadiosityOutflow JOutSha_b if haveShade
"Outgoing radiosity that connects to shaded part of glass at room-side";
HeatTransfer.Interfaces.RadiosityInflow JInSha_b if haveShade
"Incoming radiosity that connects to shaded part of glass at room-side";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b glaUns_b
"Heat port at unshaded glass of room-facing surface";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b glaSha_b if haveShade
"Heat port at shaded glass of room-facing surface";
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b fra_b
"Heat port at frame of room-facing surface";
Modelica.Blocks.Interfaces.RealInput QAbsUns_flow[size(glaSys.glass, 1)](
each unit="W",
each quantity="Power") "Solar radiation absorbed by unshaded part of glass";
Modelica.Blocks.Interfaces.RealInput QAbsSha_flow[size(glaSys.glass, 1)](
each unit="W",
each quantity="Power") if haveShade
"Solar radiation absorbed by shaded part of glass";
protected
final parameter Boolean haveShade = glaSys.haveExteriorShade or glaSys.haveInteriorShade
"Parameter, equal to true if the window has a shade";
initial equation
assert(homotopyInitialization, "In " + getInstanceName() +
": The constant homotopyInitialization has been modified from its default value. This constant will be removed in future releases.",
level = AssertionLevel.warning);
equation
connect(win.uSha, uSha);
connect(JInUns_a, win.JInUns_a);
connect(JOutUns_a, win.JOutUns_a);
connect(win.glaUns_a, glaUns_a);
connect(win.glaSha_a, glaSha_a);
connect(win.JInSha_a, JInSha_a);
connect(win.JOutSha_a, JOutSha_a);
connect(win.fra_a, fra_a);
connect(win.JOutUns_b, JOutUns_b);
connect(win.JInUns_b, JInUns_b);
connect(win.glaUns_b, glaUns_b);
connect(win.glaSha_b, glaSha_b);
connect(win.JOutSha_b, JOutSha_b);
connect(win.JInSha_b, JInSha_b);
connect(win.fra_b, fra_b);
connect(opa.port_a, opa_a);
connect(opa.port_b, opa_b);
connect(win.QAbsUns_flow, QAbsUns_flow);
connect(win.QAbsSha_flow, QAbsSha_flow);
end ConstructionWithWindow;