modelReversibleConnection

A connection that supports reversible flow with a pump and a valve

Extends from Buildings.Fluid.Interfaces.PartialTwoPortInterface (Partial model with two ports and declaration of quantities that are used by many models).

Information

This model implements a piping connection for reversible mass flow rate between the storage plant and the district network.

Type	Name	Default	Description
Modelica.Units.SI.MassFlowRate	mTan_flow_nominal		Nominal mass flow rate for CHW tank branch
Modelica.Units.SI.PressureDifference	dpPum_nominal		Nominal pressure difference for supply pump sizing
Modelica.Units.SI.PressureDifference	dpVal_nominal		Nominal pressure difference for return valve sizing
Assumptions
Boolean	allowFlowReversal (from PartialTwoPort)	true	= false to simplify equations, assuming, but not enforcing, no flow reversal
Nominal condition
Modelica.Units.SI.MassFlowRate	m_flow_nominal (from PartialTwoPortInterface)		Nominal mass flow rate
Advanced
Modelica.Units.SI.MassFlowRate	m_flow_small (from PartialTwoPortInterface)	1E-4*abs(m_flow_nominal)	Small mass flow rate for regularization of zero flow
Advanced › Diagnostics
Boolean	show_T (from PartialTwoPortInterface)	false	= true, if actual temperature at port is computed
Initialization
Modelica.Units.SI.ThermodynamicTemperature	T_start		Start temperature

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.RealOutput	PEle	Estimated power consumption
Modelica.Blocks.Interfaces.RealInput	yPum	Normalized speed signal for pump
Modelica.Blocks.Interfaces.RealInput	yVal	Normalized flow signal for valve

Type	Name	Default	Description
Modelica.Units.SI.MassFlowRate	m_flow (from PartialTwoPortInterface)	port_a.m_flow	Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction)
Modelica.Units.SI.PressureDifference	dp (from PartialTwoPortInterface)	port_a.p - port_b.p	Pressure difference between port_a and port_b
Medium.ThermodynamicState	sta_a (from PartialTwoPortInterface)	if allowFlowReversal then Medium.setState_phX(port_a.p, noEvent(actualStream(port_a.h_outflow)), noEvent(actualStream(port_a.Xi_outflow))) else Medium.setState_phX(port_a.p, noEvent(inStream(port_a.h_outflow)), noEvent(inStream(port_a.Xi_outflow)))	Medium properties in port_a
Medium.ThermodynamicState	sta_b (from PartialTwoPortInterface)	if allowFlowReversal then Medium.setState_phX(port_b.p, noEvent(actualStream(port_b.h_outflow)), noEvent(actualStream(port_b.Xi_outflow))) else Medium.setState_phX(port_b.p, noEvent(port_b.h_outflow), noEvent(port_b.Xi_outflow))	Medium properties in port_b
Buildings.Fluid.Movers.Preconfigured.SpeedControlled_y	pum		Supply pump
Buildings.Fluid.FixedResistances.CheckValve	cheVal		Check valve
Buildings.Fluid.Actuators.Valves.TwoWayPressureIndependent	val		Valve that throttles CHW from the supply line to the tank