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Water Boundary

Boundary condition of Air

	Description
	The Water Boundary component models a generic boundary condition for the lumped thermal fluid simulation of Water.

Equations

The calculation is changed based on parameter values of Fidelity of properties and Dynamics of mass in the Water Settings component.

Fidelity of properties = Constant and Dynamics of mass = Static

In / Outlet = Inlet

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

$`port.p` = p$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

$`port.T` = T$

Mass flow rate is defined with:

$`port.mflow` = \{\begin{array}{c} - mflow__in & External input of Mass flow rate = true \\ - mflow__boundary & others \end{array}$

State equation:

$p = ρ \cdot `HeatTransfer.Properties.Fluid.SimpleWater.R_gas` \cdot T$

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.SimpleWater.cp` \cdot T + `HeatTransfer.Properties.Fluid.SimpleWater.hflowoff`$

$`port.hfow` = hflow$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleWater`$ , see more in Water Settings.

In / Outlet = Outlet

State equation:

$p = ρ \cdot `HeatTransfer.Properties.Fluid.SimpleWater.R_gas` \cdot T$

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.SimpleWater.cp` \cdot T + `HeatTransfer.Properties.Fluid.SimpleWater.hflowoff`$

$`port.hfow` = hflow$

Other definitions:

$`port.T` = T__boundary$

$T = T__boundary$

$p = `port.p`$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleWater`$ , see more in Water Settings.

Fidelity of properties = Constant and Dynamics of mass = Dynamic

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

State equation:

$p = ρ \cdot `HeatTransfer.Properties.Fluid.SimpleWater.R_gas` \cdot T$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.SimpleWater.cp` \cdot T + `HeatTransfer.Properties.Fluid.SimpleWater.hflowoff`$

$u = hflow - \frac{p}{ρ}$

Port's variable definitions:

$`port.p` = p$

$`port.hflow` = hflow$

$`port.rho` = ρ$

$`port.T` = T$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleWater`$ , see more in Water Settings.

Fidelity of properties : Liquid Water (Lookup table of IAPWS/IF97) and Dynamics of mass = Static

In / Outlet = Inlet

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

$`port.p` = p$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

$`port.T` = T$

Mass flow rate is defined with:

$`port.mflow` = \{\begin{array}{c} - mflow__in & External input of Mass flow rate = true \\ - mflow__boundary & others \end{array}$

State equation:

$ρ = LUT__ρ (p, T) &semi;$

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = LUT__ρ (p__boundary, T__boundary)$

$`port.hfow` = hflow$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined with Liquid Water (Lookup table of IAPWS/IF97), see more in Water Settings.

	In / Outlet = Outlet
	State equation: $p = LUT__ρ (p__boundary, T__boundary)$ $`port.rho` = ρ$ Definition of Enthalpy: $hflow = LUT__hflow (p__boundary, T__boundary)$ $`port.hfow` = hflow$ Other definitions: $`port.T` = T__boundary$ $T = T__boundary$ $p = p__boundary$ (*) The properties are defined with Liquid Water (Lookup table of IAPWS/IF97), see more in Water Settings.

Fidelity of properties : Liquid Water (Lookup table of IAPWS/IF97) and Dynamics of mass = Dynamic

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

State equation:

$ρ = LUT__ρ (p, T) &semi;$

Definition of Enthalpy:

$hflow = LUT__ρ (p__, T__)$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined with Liquid Water (Lookup table of IAPWS/IF97), see more in Water Settings.

Fidelity of properties : IAPWS/IF97 standard and Dynamics of mass = Static

In / Outlet = Inlet

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

$`port.p` = p$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

$`port.T` = T$

Mass flow rate is defined with:

$`port.mflow` = \{\begin{array}{c} - mflow__in & External input of Mass flow rate = true \\ - mflow__boundary & others \end{array}$

State equation:

$p = `HeatTransfer.Properties.Fluid.WaterIF97_Density_pT` (p, T, 0)$

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.WaterIF97_SpecificEnthalpy_pT` (p, T, 0)$

$`port.hfow` = hflow$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined with IAPWS/IF97 standard, see more in Water Settings.

In / Outlet = Outlet

State equation:

$p = `HeatTransfer.Properties.Fluid.WaterIF97_Density_pT` (p__boundary, T__boundary, 0)$

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.WaterIF97_SpecificEnthalpy_pT` (p__boundary, T__boundary, 0)$

$`port.hfow` = hflow$

Other definitions:

$`port.T` = T__boundary$

$T = T__boundary$

$p = p__boundary$

(*) The properties are defined with IAPWS/IF97 standard, see more in Water Settings.

Fidelity of properties : IAPWS/IF97 standard and Dynamics of mass = Dynamic

Pressure is defined with:

$p = \{\begin{array}{c} p__in & External input of Pressure = true \\ p__boundary & others \end{array}$

Temperature is defined with:

$T = \{\begin{array}{c} T__in & External input of Temperature = true \\ T__boundary & others \end{array}$

State equation:

$p = `HeatTransfer.Properties.Fluid.WaterIF97_Density_pT` (p, T, 0)$

Definition of Enthalpy:

$hflow = &grave; HeatTransfer.Properties.Fluid.WaterIF97_SpecificEnthalpy_pT` (p, T, 0)$

$u = hflow - \frac{p}{ρ}$

Port's variable definitions:

$`port.p` = p$

$`port.hflow` = hflow$

$`port.rho` = ρ$

$`port.T` = T$

(*) The properties are defined with IAPWS/IF97 standard, see more in Water Settings.

Variables

Symbol	Units	Description	Modelica ID
$p$	$Pa$	Pressure	p
$T$	$K$	Temperature	T
$ρ$	$\frac{kg}{m^{3}}$	Density	rho
$hflow$	$\frac{J}{kg}$	Specific enthalpy	hflow
$u$	$\frac{J}{kg}$	Specific energy	u
$mflow$	$\frac{kg}{s}$	Mass flow rate	mflow

Connections

Name	Condition	Description	Modelica ID
$port$		Air Port	$port_a$
$p__in$	if External input of Pressure is true.	Input signal of Pressure condition	$p_in$
$T__in$	if External input of Temperature is true.	Input signal of Temperature condition	$T_in$
$mflow__in$	if External input of Mass flow rate is true.	Input signal of Mass flow rate condition	$mflow_in$

Parameters

Symbol	Default	Units	Description	Modelica ID
$Water simulation settings$	$WaterSettings1$	$-$	Specify a component of Water simulation settings	Settings
$p__boundary$	$101325$	$Pa$	Boundary condition of pressure	p_boundary
$External input of Pressure$	$false$	$-$	If true, $p__in$ is valid	p_ext
$T__boundary$	$293.15$	$K$	Boundary condition of temperature	T_boundary
$External input of Temperature$	$false$	$-$	If true, $T__in$ is valid	T_ext
$mflow__boundary$	$0.001$	$\frac{kg}{s}$	Boundary condition of mass flow rate	mflow_boundary
$External input of Mass flow rate$	$false$	$-$	If true, $mflow__in$ is valid	mflow_ext
$In / Outlet$	$Inlet$	$-$	Select Inlet or Outlet if Dynamics of mass is Static.	InOut

	See Also
	Heat Transfer Library Overview Water Overview Water Boundaries Overview

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Automotive and Aerospace

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Machine Design & Industrial Automation

Other

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Institutional Student Licensing

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Product Training

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Media Center

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