Buildings.Rooms.Constructions

Information

Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).

Package Content

Name	Description
ConstructionWithWindow	Model for an opaque construction that has one window embedded in the construction
Construction	Model for an opaque construction that has no window
Examples	Collection of models that illustrate model use and test models
BaseClasses	Package with base classes for Buildings.Rooms.Constructions

Buildings.Rooms.Constructions.ConstructionWithWindow

Information

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 record layers to 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 record glaSys to 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.Rooms.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	redeclare parameter Building...	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
Generic	glaSys	redeclare parameter HeatTran...	Material properties of glazing system

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[glaSys.nLay]	Solar radiation absorbed by unshaded part of glass [W]
input RealInput	QAbsSha_flow[glaSys.nLay]	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.Rooms.Constructions.BaseClasses.PartialConstruction(
    final AOpa=A-AWin);

  parameter Modelica.SIunits.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.SIunits.Area AFra = fFra*AWin "Frame area";
  final parameter Modelica.SIunits.Area AGla=AWin - AFra "Glass area";
  parameter Boolean linearizeRadiation = true 
    "Set to true to linearize emissive power";

 replaceable parameter HeatTransfer.Data.GlazingSystems.Generic glaSys 
    "Material properties of glazing system";

  HeatTransfer.Conduction.MultiLayer opa(
    final A=AOpa,
    final layers=layers,
    final steadyStateInitial=steadyStateInitial,
    final T_a_start=T_a_start,
    final T_b_start=T_b_start) 
    "Model for heat transfer through opaque construction";

  HeatTransfer.Windows.Window win(
    final glaSys=glaSys,
    final A=AWin,
    final fFra=fFra,
    final linearize = linearizeRadiation,
    final til=til) "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";

protected 
  final parameter Boolean haveShade = glaSys.haveExteriorShade or glaSys.haveInteriorShade 
    "Parameter, equal to true if the window has a shade";

public 
  Modelica.Blocks.Interfaces.RealInput QAbsUns_flow[glaSys.nLay](each unit="W",
      each quantity="Power") 
    "Solar radiation absorbed by unshaded part of glass";
  Modelica.Blocks.Interfaces.RealInput QAbsSha_flow[glaSys.nLay](each unit="W",
      each quantity="Power") if haveShade 
    "Solar radiation absorbed by shaded part of glass";

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;

Buildings.Rooms.Constructions.Construction

Information

Extends from Buildings.Rooms.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	redeclare parameter Building...	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]

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.Rooms.Constructions.BaseClasses.PartialConstruction(
    final AOpa=A);

end Construction;