ClosedVolumeVolume of fixed size, closed to the ambient, with inlet/outlet ports |
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Diagram
Information
This information is part of the Modelica Standard Library maintained by the Modelica Association.
Ideally mixed volume of constant size with two fluid ports and one medium model.
The flow properties are computed from the upstream quantities, pressures are equal in both nodes and the medium model if use_portsData=false.
Heat transfer through a thermal port is possible, it equals zero if the port remains unconnected.
A spherical shape is assumed for the heat transfer area, with V=4/3*pi*r^3, A=4*pi*r^2.
Ideal heat transfer is assumed per default; the thermal port temperature is equal to the medium temperature.
If use_portsData=true, the port pressures represent the pressures just after the outlet (or just before the inlet) in the attached pipe.
The hydraulic resistances portsData.zeta_in and portsData.zeta_out determine the dissipative pressure drop between volume and port depending on
the direction of mass flow. See VesselPortsData and [Idelchik, Handbook of Hydraulic Resistance, 2004].
Parameters (18)
| energyDynamics |
Value: system.energyDynamics Type: Dynamics Description: Formulation of energy balance |
|---|---|
| massDynamics |
Value: system.massDynamics Type: Dynamics Description: Formulation of mass balance |
| substanceDynamics |
Value: massDynamics Type: Dynamics Description: Formulation of substance balance |
| traceDynamics |
Value: massDynamics Type: Dynamics Description: Formulation of trace substance balance |
| p_start |
Value: system.p_start Type: AbsolutePressure (Pa) Description: Start value of pressure |
| use_T_start |
Value: true Type: Boolean Description: = true, use T_start, otherwise h_start |
| T_start |
Value: if use_T_start then system.T_start else Medium.temperature_phX(p_start, h_start, X_start) Type: Temperature (K) Description: Start value of temperature |
| h_start |
Value: if use_T_start then Medium.specificEnthalpy_pTX(p_start, T_start, X_start) else Medium.h_default Type: SpecificEnthalpy (J/kg) Description: Start value of specific enthalpy |
| X_start |
Value: Medium.X_default Type: MassFraction[Medium.nX] (kg/kg) Description: Start value of mass fractions m_i/m |
| C_start |
Value: Medium.C_default Type: ExtraProperty[Medium.nC] Description: Start value of trace substances |
| nPorts |
Value: 0 Type: Integer Description: Number of ports |
| use_portsData |
Value: true Type: Boolean Description: = false to neglect pressure loss and kinetic energy |
| portsData |
Value: Type: VesselPortsData[if use_portsData then nPorts else 0] Description: Data of inlet/outlet ports |
| m_flow_nominal |
Value: if system.use_eps_Re then system.m_flow_nominal else 1e2 * system.m_flow_small Type: MassFlowRate (kg/s) Description: Nominal value for mass flow rates in ports |
| m_flow_small |
Value: if system.use_eps_Re then system.eps_m_flow * m_flow_nominal else system.m_flow_small Type: MassFlowRate (kg/s) Description: Regularization range at zero mass flow rate |
| use_Re |
Value: system.use_eps_Re Type: Boolean Description: = true, if turbulent region is defined by Re, otherwise by m_flow_small |
| use_HeatTransfer |
Value: false Type: Boolean Description: = true to use the HeatTransfer model |
| V |
Value: Type: Volume (m³) Description: Volume |
Inputs (2)
Connectors (2)
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ports |
Type: VesselFluidPorts_b[nPorts] Description: Fluid inlets and outlets |
|---|---|---|
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heatPort |
Type: HeatPort_a |
Components (4)
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system |
Type: System Description: System properties |
|---|---|---|
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medium |
Type: BaseProperties |
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portsData |
Type: VesselPortsData[if use_portsData then nPorts else 0] Description: Data of inlet/outlet ports |
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heatTransfer |
Type: HeatTransfer |
Used in Examples (2)
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Modelica.Fluid.Examples.TraceSubstances Demonstrates a room volume with CO2 accumulation |
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Modelica.Fluid.Examples.TraceSubstances Demonstrates a room volume with CO2 controls |