modelControllerValveAndCompressor_mflow

Controls the mass flow through a valve or a compressor depending on the pressure difference

Diagram of ControllerValveAndCompressor_mflow

Extends from TransiEnt.Basics.Icons.Controller (Icon for controller).

Information

1. Purpose of model

This controller gives the desired mass flow rate to a valve or compressor. The given pressures before and after the unit and the mass flow rate through the unit can be given by parameters or inputs.

The desired pressure difference (p_after - p_before) is the decisive factor. Hysteresis is limited.

2. Level of detail, physical effects considered, and physical insight

(none)

3. Limits of validity

(no remarks)

4. Interfaces

m_flowDesired: input for the desired mass flow rate in kg/s

p_before: input for the pressure before the unit in Pa

p_after: input for the pressure after the unit in Pa

m_flowValve: output for the mass flow rate through the valve in kg/s

m_flowCompressor: output for the mass flow rate throught the compressor in kg/s

5. Nomenclature

(no elements)

6. Governing Equations

(no remarks)

7. Remarks for Usage

(no remarks)

8. Validation

(no remarks)

9. References

(no remarks)

10. Version History

(no remarks)

Parameters

Type	Name	Default	Description
Fundamental Definitions
SI.Pressure	p_before_low	1e5	Lower limit for hysteresis to limit mass flow for too low pressures
SI.Pressure	p_before_high	1.1e5	Higher limit for hysteresis to limit mass flow for too low pressures

Connectors

Type	Name	Description
TransiEnt.Basics.Interfaces.General.MassFlowRateIn	m_flowDesired	Desired mass flow rate
TransiEnt.Basics.Interfaces.General.PressureIn	p_before	Pressure before the valve/compressor
TransiEnt.Basics.Interfaces.General.PressureIn	p_after	Pressure after the valve/compressor
TransiEnt.Basics.Interfaces.General.MassFlowRateOut	m_flowValve	Mass flow rate through the valve
TransiEnt.Basics.Interfaces.General.MassFlowRateOut	m_flowCompressor	Mass flow rate through the compressor

Components

Type	Name	Default	Description
Modelica.Blocks.Logical.Hysteresis	hysteresis