Air Boundary - MapleSim Help

All Products Maple MapleSim

Home : Support : Online Help : MapleSim Toolboxes : MapleSim Heat Transfer Library : Air Components : Boundaries : Air Boundary

Air Boundary

Boundary condition of Air

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

Equations

The calculation is changed based on parameter values of Fidelity of properties and Dynamics of mass in the Air 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:

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

$`port.rho` = ρ$

Definition of Enthalpy:

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

$`port.hfow` = hflow$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleAir`$ . See more details in Air Settings.

In / Outlet = Outlet

State equation:

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

$`port.rho` = ρ$

Definition of Enthalpy:

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

$`port.hfow` = hflow$

Other definitions:

$`port.T` = T__boundary$

$T = T__boundary$

$p = `port.p`$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleAir`$ . See more details in Air 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:

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

Definition of Enthalpy:

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

$u = hflow - \frac{p}{ρ}$

Port's variable definitions:

$`port.p` = p$

$`port.hflow` = hflow$

$`port.rho` = ρ$

$`port.T` = T$

(*) The properties are defined in $`HeatTransfer.Properties.Fluid.SimpleAir`$ . See more details in Air Settings.

Fidelity of properties : Ideal Gas (NASA Polynomial) 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:

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

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.NASAPoly_h_T` (`HeatTransfer.Properties.Fluid.NASAPolyAir`, T)$

$`port.hfow` = hflow$

$u = hflow - \frac{p}{ρ}$

(*) The properties are defined with NASA polynomials and coefficients. For details, see Air Settings.

(*) $`HeatTransfer.Properties.Fluid.NASAPoly_h_T`$ is NASA polynomial of Specific enthalpy .

(*) NASA Glenn coefficients and other properties are defined in $`HeatTransfer.Properties.Fluid.NASAPolyAir`$ .

In / Outlet = Outlet

State equation:

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

$`port.rho` = ρ$

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.NASAPoly_h_T` (`HeatTransfer.Properties.Fluid.NASAPolyAir`, T__boundary)$

$`port.hfow` = hflow$

Other definitions:

$`port.T` = T__boundary$

$T = T__boundary$

$p = `port.p`$

(*) The properties are defined with NASA polynomials and coefficients. For details, see Air Settings.

(*) $`HeatTransfer.Properties.Fluid.NASAPoly_h_T`$ is NASA polynomial of Specific enthalpy .

(*) NASA Glenn coefficients and other properties are defined in $`HeatTransfer.Properties.Fluid.NASAPolyAir`$ .

Fidelity of properties : Ideal Gas (NASA Polynomial) 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:

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

Definition of Enthalpy:

$hflow = `HeatTransfer.Properties.Fluid.NASAPoly_h_T` (`HeatTransfer.Properties.Fluid.NASAPolyAir`, T)$

$u = hflow - \frac{p}{ρ}$

Port's variable definitions:

$`port.p` = p$

$`port.hflow` = hflow$

$`port.rho` = ρ$

$`port.T` = T$

(*) The properties are defined with NASA polynomials and coefficients. For details, see Air Settings.

(*) $`HeatTransfer.Properties.Fluid.NASAPoly_h_T`$ is NASA polynomial of Specific enthalpy .

(*) NASA Glenn coefficients and other properties are defined in $`HeatTransfer.Properties.Fluid.NASAPolyAir`$ .

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
$Air simulation settings$	$AirSettings1$	$-$	Specify a component of Air 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 Air Overview Air Boundaries Overview

Download Help Document

Maple

Maple Add-Ons

MapleSim

MapleSim Add-Ons

Systems Engineering

Consulting Services

Maple T.A. and Möbius

Education

Industries

Automotive and Aerospace

Robotics

Machine Design & Industrial Automation

Other

Application Areas

Product Pricing

Purchasing

Institutional Student Licensing

Maplesoft Elite Maintenance (EMP)

Support

Product Training

Online Product Help

Webinars & Events

Publications

Content Hubs

Examples & Applications

Community

About Maplesoft

Media Center

User Community

Contact

Online Help

All Products Maple MapleSim

Maple

Powerful math software that is easy to use

Maple Add-Ons

MapleSim

Advanced System Level Modeling

MapleSim Add-Ons

Systems Engineering

Consulting Services

Maple T.A. and Möbius

Education

Industries

Automotive and Aerospace

Robotics

Machine Design & Industrial Automation

Other

Application Areas

Product Pricing

Purchasing

Institutional Student Licensing

Maplesoft Elite Maintenance (EMP)

Support

Product Training

Online Product Help

Webinars & Events

Publications

Content Hubs

Examples & Applications

Community

About Maplesoft

Media Center

User Community

Contact

Online Help

All Products Maple MapleSim