modelLumpVolume
Information
This component links the variation of the potential enthalpy (or temperature for an ideal gase) to heat flow balance in the opened lumped volume. It is the thermal inertia of a lumped volume
A lump volume means that a fixed geometric volume is considered but the boundary of this volume are not hermetic thus the volume is not closed.
The volume is at constant pressure since the focus is on the thermal aspect only and the thermal time is often much greater than the aeraulic time.
For an open volume the balance is performed with the enthalpy to take account of the isobaric dilatation.
The basic constitutive equation for convection derives from the first principe of thermodynamics :
Where :
- port.Q_flow: The Heat flow balance at the heat port
- m: The Mass of the inertial component
- h: The specific enthalpy
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.Volume | V | 1 | Air node volume [m3] |
| Dynamics | energyDynamics | Dynamics.FixedInitial | Formulation of energy balance |
| Modelica.SIunits.Temperature | T_start | 293.15 | Start value for temperature, if not steady state |
| Modelica.SIunits.Pressure | p | Medium.reference_p | Constant pressure |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | port_a |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.BaseProperties | medium | ||
| Modelica.SIunits.Energy | E | Energy storage | |
| Modelica.SIunits.Mass | m | Mass of the volume | |
| Medium.Temperature | T | temperature of the fluid |
Contents
| Name | Description |
|---|---|
 Medium |