modelIdealSource

Base class for pressure and mass flow source with optional power input

Extends from IDEAS.Fluid.Movers.BaseClasses.IdealSource (Base class for pressure and mass flow source with optional power input).

Information

Model of a fictitious pipe that is used as a base class for a pressure source or to prescribe a mass flow rate.

Note that for fans and pumps with dynamic balance, both the heat and the flow work are added to the volume of air or water. This simplifies the equations compared to adding heat to the volume, and flow work to this model.

Parameters

Type	Name	Default	Description
Boolean	control_m_flow (from IdealSource)		if true, then the mass flow rate is equal to the value of m_flow_in
Boolean	control_dp (from IdealSource)	not control_m_flow	if true, then the head is equal to the value of dp_in
Assumptions
Boolean	allowFlowReversal (from PartialTwoPort)	true	= false to simplify equations, assuming, but not enforcing, no flow reversal
Advanced
Modelica.Units.SI.PressureDifference	dp_start (from PartialTwoPortTransport)	0	Guess value of dp = port_a.p - port_b.p
Medium.MassFlowRate	m_flow_start (from PartialTwoPortTransport)	0	Guess value of m_flow = port_a.m_flow
Medium.MassFlowRate	m_flow_small (from PartialTwoPortTransport)		Small mass flow rate for regularization of zero flow
Advanced › Diagnostics
Boolean	show_T (from PartialTwoPortTransport)	true	= true, if temperatures at port_a and port_b are computed
Boolean	show_V_flow (from PartialTwoPortTransport)	true	= true, if volume flow rate at inflowing port is computed

Connectors

Type	Name	Description
Modelica.Fluid.Interfaces.FluidPort_a	port_a (from PartialTwoPort)	Fluid connector a (positive design flow direction is from port_a to port_b)
Modelica.Fluid.Interfaces.FluidPort_b	port_b (from PartialTwoPort)	Fluid connector b (positive design flow direction is from port_a to port_b)
Modelica.Blocks.Interfaces.RealInput	m_flow_in (from IdealSource)	Prescribed mass flow rate
Modelica.Blocks.Interfaces.RealInput	dp_in (from IdealSource)	Prescribed pressure difference port_a.p-port_b.p

Components

Type	Name	Default	Description
Medium.MassFlowRate	m_flow (from PartialTwoPortTransport)		Mass flow rate in design flow direction
Modelica.Units.SI.PressureDifference	dp (from PartialTwoPortTransport)		Pressure difference between port_a and port_b (= port_a.p - port_b.p)
Modelica.Units.SI.VolumeFlowRate	V_flow (from PartialTwoPortTransport)	m_flow/Modelica.Fluid.Utilities.regStep(m_flow, Medium.density(Medium.setState_phX(p = port_a.p, h = inStream(port_a.h_outflow), X = inStream(port_a.Xi_outflow))), Medium.density(Medium.setState_phX(p = port_b.p, h = inStream(port_b.h_outflow), X = inStream(port_b.Xi_outflow))), m_flow_small)	Volume flow rate at inflowing port (positive when flow from port_a to port_b)
Medium.Temperature	port_a_T (from PartialTwoPortTransport)	Modelica.Fluid.Utilities.regStep(port_a.m_flow, Medium.temperature(Medium.setState_phX(p = port_a.p, h = inStream(port_a.h_outflow), X = inStream(port_a.Xi_outflow))), Medium.temperature(Medium.setState_phX(port_a.p, port_a.h_outflow, port_a.Xi_outflow)), m_flow_small)	Temperature close to port_a, if show_T = true
Medium.Temperature	port_b_T (from PartialTwoPortTransport)	Modelica.Fluid.Utilities.regStep(port_b.m_flow, Medium.temperature(Medium.setState_phX(p = port_b.p, h = inStream(port_b.h_outflow), X = inStream(port_b.Xi_outflow))), Medium.temperature(Medium.setState_phX(port_b.p, port_b.h_outflow, port_b.Xi_outflow)), m_flow_small)	Temperature close to port_b, if show_T = true

Revisions

October 8, 2013, by Michael Wetter:
Removed parameter show_V_flow.
May 25, 2011 by Michael Wetter:
Removed the option to add power to the medium, as this is dealt with in the volume that is used in the mover model.
July 27, 2010 by Michael Wetter:
Redesigned model to fix bug in medium balance.
April 13, 2010 by Michael Wetter:
Made heat connector optional.
March 23, 2010 by Michael Wetter:
First implementation.