modelPartialEightPortInterface

Partial model with eight ports and declaration of quantities that are used by many models

Extends from Buildings.Fluid.Interfaces.EightPort (Partial model with eight ports).

Information

This component defines the interface for models with eight fluid ports and four fluid streams. It is similar to Buildings.Fluid.Interfaces.PartialTwoPortInterface, but it has eight ports instead of two.

The model is used by other models in this package that add heat transfer, mass transfer and pressure drop equations.

Parameters

Type	Name	Default	Description
Assumptions
Boolean	allowFlowReversal1 (from EightPort)	true	= true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal2 (from EightPort)	true	= true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal3 (from EightPort)	true	= true to allow flow reversal in medium 3, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal4 (from EightPort)	true	= true to allow flow reversal in medium 4, false restricts to design direction (port_a -> port_b)
Advanced › Initialization
Modelica.Units.SI.SpecificEnthalpy	h_outflow_a1_start (from EightPort)	Medium1.h_default	Start value for enthalpy flowing out of port a1
Modelica.Units.SI.SpecificEnthalpy	h_outflow_b1_start (from EightPort)	Medium1.h_default	Start value for enthalpy flowing out of port b1
Modelica.Units.SI.SpecificEnthalpy	h_outflow_a2_start (from EightPort)	Medium2.h_default	Start value for enthalpy flowing out of port a2
Modelica.Units.SI.SpecificEnthalpy	h_outflow_b2_start (from EightPort)	Medium2.h_default	Start value for enthalpy flowing out of port b2
Modelica.Units.SI.SpecificEnthalpy	h_outflow_a3_start (from EightPort)	Medium3.h_default	Start value for enthalpy flowing out of port a1
Modelica.Units.SI.SpecificEnthalpy	h_outflow_b3_start (from EightPort)	Medium3.h_default	Start value for enthalpy flowing out of port b1
Modelica.Units.SI.SpecificEnthalpy	h_outflow_a4_start (from EightPort)	Medium4.h_default	Start value for enthalpy flowing out of port a1
Modelica.Units.SI.SpecificEnthalpy	h_outflow_b4_start (from EightPort)	Medium4.h_default	Start value for enthalpy flowing out of port b1
Nominal condition
Modelica.Units.SI.MassFlowRate	m1_flow_nominal		Nominal mass flow rate
Modelica.Units.SI.MassFlowRate	m2_flow_nominal		Nominal mass flow rate
Modelica.Units.SI.MassFlowRate	m3_flow_nominal		Nominal mass flow rate
Modelica.Units.SI.MassFlowRate	m4_flow_nominal		Nominal mass flow rate
Advanced
Medium1.MassFlowRate	m1_flow_small	1E-4*abs(m1_flow_nominal)	Small mass flow rate for regularization of zero flow
Medium2.MassFlowRate	m2_flow_small	1E-4*abs(m2_flow_nominal)	Small mass flow rate for regularization of zero flow
Medium3.MassFlowRate	m3_flow_small	1E-4*abs(m3_flow_nominal)	Small mass flow rate for regularization of zero flow
Medium4.MassFlowRate	m4_flow_small	1E-4*abs(m4_flow_nominal)	Small mass flow rate for regularization of zero flow
Advanced › Diagnostics
Boolean	show_T	false	= true, if actual temperature at port is computed

Connectors

Type	Name	Description
Modelica.Fluid.Interfaces.FluidPort_a	port_a1 (from EightPort)	Fluid connector a1 (positive design flow direction is from port_a1 to port_b1)
Modelica.Fluid.Interfaces.FluidPort_b	port_b1 (from EightPort)	Fluid connector b1 (positive design flow direction is from port_a1 to port_b1)
Modelica.Fluid.Interfaces.FluidPort_a	port_a2 (from EightPort)	Fluid connector a2 (positive design flow direction is from port_a2 to port_b2)
Modelica.Fluid.Interfaces.FluidPort_b	port_b2 (from EightPort)	Fluid connector b2 (positive design flow direction is from port_a2 to port_b2)
Modelica.Fluid.Interfaces.FluidPort_a	port_a3 (from EightPort)	Fluid connector a1 (positive design flow direction is from port_a3 to port_b3)
Modelica.Fluid.Interfaces.FluidPort_b	port_b3 (from EightPort)	Fluid connector b2 (positive design flow direction is from port_a3 to port_b3)
Modelica.Fluid.Interfaces.FluidPort_a	port_a4 (from EightPort)	Fluid connector a1 (positive design flow direction is from port_a4 to port_b4)
Modelica.Fluid.Interfaces.FluidPort_b	port_b4 (from EightPort)	Fluid connector b2 (positive design flow direction is from port_a4 to port_b4)

Components

Type	Name	Default	Description
Medium1.MassFlowRate	m1_flow	port_a1.m_flow	Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction)
Modelica.Units.SI.Pressure	dp1	port_a1.p - port_b1.p	Pressure difference between port_a1 and port_b1
Medium2.MassFlowRate	m2_flow	port_a2.m_flow	Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction)
Modelica.Units.SI.Pressure	dp2	port_a2.p - port_b2.p	Pressure difference between port_a2 and port_b2
Medium3.MassFlowRate	m3_flow	port_a3.m_flow	Mass flow rate from port_a3 to port_b3 (m3_flow > 0 is design flow direction)
Modelica.Units.SI.Pressure	dp3	port_a3.p - port_b3.p	Pressure difference between port_a3 and port_b3
Medium4.MassFlowRate	m4_flow	port_a4.m_flow	Mass flow rate from port_a4 to port_b4 (m4_flow > 0 is design flow direction)
Modelica.Units.SI.Pressure	dp4	port_a4.p - port_b4.p	Pressure difference between port_a4 and port_b4
Medium1.ThermodynamicState	sta_a1	if allowFlowReversal1 then Medium1.setState_phX(port_a1.p, noEvent(actualStream(port_a1.h_outflow)), noEvent(actualStream(port_a1.Xi_outflow))) else Medium1.setState_phX(port_a1.p, inStream(port_a1.h_outflow), inStream(port_a1.Xi_outflow))	Medium properties in port_a1
Medium1.ThermodynamicState	sta_b1	if allowFlowReversal1 then Medium1.setState_phX(port_b1.p, noEvent(actualStream(port_b1.h_outflow)), noEvent(actualStream(port_b1.Xi_outflow))) else Medium1.setState_phX(port_b1.p, port_b1.h_outflow, port_b1.Xi_outflow)	Medium properties in port_b1
Medium2.ThermodynamicState	sta_a2	if allowFlowReversal2 then Medium2.setState_phX(port_a2.p, noEvent(actualStream(port_a2.h_outflow)), noEvent(actualStream(port_a2.Xi_outflow))) else Medium2.setState_phX(port_a2.p, inStream(port_a2.h_outflow), inStream(port_a2.Xi_outflow))	Medium properties in port_a2
Medium2.ThermodynamicState	sta_b2	if allowFlowReversal2 then Medium2.setState_phX(port_b2.p, noEvent(actualStream(port_b2.h_outflow)), noEvent(actualStream(port_b2.Xi_outflow))) else Medium2.setState_phX(port_b2.p, port_b2.h_outflow, port_b2.Xi_outflow)	Medium properties in port_b2
Medium3.ThermodynamicState	sta_a3	if allowFlowReversal3 then Medium3.setState_phX(port_a3.p, noEvent(actualStream(port_a3.h_outflow)), noEvent(actualStream(port_a3.Xi_outflow))) else Medium3.setState_phX(port_a3.p, inStream(port_a3.h_outflow), inStream(port_a3.Xi_outflow))	Medium properties in port_a3
Medium3.ThermodynamicState	sta_b3	if allowFlowReversal3 then Medium3.setState_phX(port_b3.p, noEvent(actualStream(port_b3.h_outflow)), noEvent(actualStream(port_b3.Xi_outflow))) else Medium3.setState_phX(port_b3.p, port_b3.h_outflow, port_b3.Xi_outflow)	Medium properties in port_b3
Medium4.ThermodynamicState	sta_a4	if allowFlowReversal4 then Medium4.setState_phX(port_a4.p, noEvent(actualStream(port_a4.h_outflow)), noEvent(actualStream(port_a4.Xi_outflow))) else Medium4.setState_phX(port_a4.p, inStream(port_a4.h_outflow), inStream(port_a4.Xi_outflow))	Medium properties in port_a4
Medium4.ThermodynamicState	sta_b4	if allowFlowReversal4 then Medium4.setState_phX(port_b4.p, noEvent(actualStream(port_b4.h_outflow)), noEvent(actualStream(port_b4.Xi_outflow))) else Medium4.setState_phX(port_b4.p, port_b4.h_outflow, port_b4.Xi_outflow)	Medium properties in port_b4

Revisions

September 22, 2023, by Michael Wetter:
Improved documentation.
This is for IBPSA, #1796.
February 3, 2022, by Michael Wetter:
If allowFlowReversal==false, removed noEvent() declaration for sta_a and for sta_b because the variable is either already used with inStream() in the computation of state_*_inflow, or the result of a variable of the model that already may generate an event.
This is for IBPSA, #1578.
February 2, 2022, by Hongxiang Fu:
If allowFlowReversal==false, replaced actualStream() with inStream() for sta_a and removed actualStream() for sta_b.
This is for IBPSA, #1578.
March 30, 2021, by Michael Wetter:
Added annotation HideResult=true.
This is for IBPSA, #1459.
July 12, 2019, by Michael Wetter:
Corrected wrong medium in declaration of m4_flow.
July 2014, by Damien Picard:
First implementation.