modelConductionElement

Model of quasi-stationary mass and heat transfer

Extends from Internal.PartialConductionElement.

Information

This model represents an element with a fixed volume (fig. 1). The mass inside the volume is assumed quasi-stationary, meaning it is computed statically using the volume and density, and the inlet mass flow is coupled to the outlet mass flow.

Because of this, the ConductionElement cannot be used as a loop breaker.

The advantage of this approach is that multiple ConductionElements can be connected in series without causing oscillations or fast eigenvalues between their masses. The ConductionElement implements conservation of mass and energy equations for the fluid contained within the component.

For further details, see the documentation of the base class Internal.PartialConductionElement.

The useHeatTransferPropertyInput option can be selected to enable input connectors for the overall heat transfer coefficient U or the thermal conductance k = U*A. The resistanceFromAU checkbox determines which quantity is activated:

useHeatTransferPropertyInput = true and resistanceFromAU = true: enables the U input (overall heat transfer coefficient)
useHeatTransferPropertyInput = true and resistanceFromAU = false: enables the k input (thermal conductance)
useHeatTransferPropertyInput = false and resistanceFromAU = true: enables the U parameter (overall heat transfer coefficient)
useHeatTransferPropertyInput = false and resistanceFromAU = false: enables the k parameter (thermal conductance)

Parameters

Type	Name	Default	Description
Boolean	displayAnything	displayParameters and (displayVolume or displayConduction)
String	parameterString	if displayParameters and displayVolume and displayConduction then "V=%V, " + conductionString elseif displayParameters and displayVolume and not displayConduction then "V=%V" elseif displayParameters and not displayVolume and displayConduction then conductionString else ""
String	conductionString	if useHeatTransferPropertyInput and resistanceFromAU then "A=%A" elseif not useHeatTransferPropertyInput and resistanceFromAU then "A=%A, U=%U" elseif not useHeatTransferPropertyInput and not resistanceFromAU then "k=%k_par" else ""
Thermal Conductance
Boolean	useHeatTransferPropertyInput	false	= true, if input connector for either U or k_par is enabled
Boolean	resistanceFromAU	true	= true, if thermal conductance is given by U*A
SI.Area	A	1	Heat transfer area
SI.CoefficientOfHeatTransfer	U	200	Overall heat transfer coefficient
SI.ThermalConductance	k_par	200	Thermal conductance
Layout › Display parameters
Boolean	displayVolume	true	= true, if volume V is displayed
Boolean	displayConduction	true	= true, if thermal conductance is displayed

Components

Type	Name	Default	Description
Modelica.Blocks.Interfaces.RealInput	U_var		Overall heat transfer coefficient input connector [W/(m2.K)]
Modelica.Blocks.Interfaces.RealInput	k_var		Thermal conductance input connector [W/K]