modelInteriorConvection

Model for a interior (room-side) convective heat transfer with variable surface area

Extends from Buildings.HeatTransfer.Convection.BaseClasses.PartialConvection (Partial model for heat convection).

Information

This is a model for a convective heat transfer for interior, room-facing surfaces. The parameter conMod determines the model that is used to compute the heat transfer coefficient:

If conMod= Buildings.HeatTransfer.Types.InteriorConvection.Fixed, then the convective heat transfer coefficient is set to the value specified by the parameter hFixed.
If conMod= Buildings.HeatTransfer.Types.InteriorConvection.Temperature, then the convective heat tranfer coefficient is a function of the temperature difference. The convective heat flux is computed using
- for floors the function Buildings.HeatTransfer.Convection.Functions.HeatFlux.floor
- for ceilings the function Buildings.HeatTransfer.Convection.Functions.HeatFlux.ceiling
- for walls the function Buildings.HeatTransfer.Convection.Functions.HeatFlux.wall

This model is identical to Buildings.HeatTransfer.Convection.Interior except that it has an input u that is used to scale the heat transfer. This can be used if the heat transfer area is variable. An example usage is for a window with shade, in which the surface area of a shaded part of a window changes depending on the shading control signal.

Parameters

Type	Name	Default	Description
Modelica.Units.SI.Area	A (from PartialConvection)		Heat transfer area
Boolean	homotopyInitialization	true	= true, use homotopy method
Buildings.HeatTransfer.Types.InteriorConvection	conMod	Buildings.HeatTransfer.Types.InteriorConvection.Fixed	Convective heat transfer model
Modelica.Units.SI.CoefficientOfHeatTransfer	hFixed	3	Constant convection coefficient
Modelica.Units.SI.Angle	til		Surface tilt

Connectors

Type	Name	Description
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	solid (from PartialConvection)
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b	fluid (from PartialConvection)
Modelica.Blocks.Interfaces.RealInput	u	Input connector, used to scale the surface area to take into account an operable shading device

Components

Type	Name	Description
Modelica.Units.SI.HeatFlowRate	Q_flow (from PartialConvection)	Heat flow rate from solid -> fluid
Modelica.Units.SI.HeatFlux	q_flow (from PartialConvection)	Convective heat flux from solid -> fluid
Modelica.Units.SI.TemperatureDifference	dT (from PartialConvection)	= solid.T - fluid.T

Revisions

February 11, 2022, by Michael Wetter:
Change parameter isFloor to is_floor, and isCeiling to is_ceiling, for consistency with naming convention.
April 14, 2020, by Michael Wetter:
Changed homotopyInitialization to a constant.
This is for IBPSA, #1341.
March 2, 2015, by Michael Wetter:
First implementation.