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Multi Radiation

 Multiple Heat Radiation

Description

The Multi Radiation component models multiple Heat Radiations.

The total number of Heat Radiation components is determined by the Nodes parameter.

The following image is an example with Heat Radiation components to explain the behavior of Multi Radiation component.

Radiation type

Radiation geometry

Use Correction input

Constant

-

false or true

External input

-

false or true

General

-

false or true

Use References

Surrounded object

false or true

Two parallel plates

false or true

Two long concentric cylinders

false or true

Concentric spheres

false or true


The following table is the image of radiation geometry when Radiation type is Use References.

Radiation type

Radiation geometry

Use References

Surrounded object

Two parallel plates

Two long concentric cylinders

Concentric spheres


(For details, see Heat Radiation help).

Equations

(For details, see Heat Radiation help).

Variables

(For details, see Heat Radiation help).

Connections

Name

Units

Condition

Description

Modelica ID

port_ai

 

 

i-th thermal port, a

port_a[i]

port_bi

 

 

i-th thermal port, b

port_b[i]

Gr__in

m2

if Radiation type is
External input.

Input signal of the heat transfer coefficient

Gr_in

cori

-

if use correction input is
true.

i-th input signal of the correction factor for Qflow

cor[i]

Parameters

Symbol

Default

Units

Description

Modelica ID

Radiation Type

General

Select Type of Radiation

 General : Use the generalized equation

 Constant : Radiation conductance is constant

 External input: Radiation conductance given by input

 Use References : Use references for Radiation conductance

TypeOfRadiation

Radiation Geometry

Surrounded object

Geometry type of Radiation.

RadiationGeometry

Nodes

2

Number of node

numNode

Use references of  emissivity for Material1

false

If true, Emissivity for Material 1 are defined by reference data

use_reference_emissivity1

Use references of  emissivity for Material2

false

If true, Emissivity for Material 2 are defined by reference data

use_reference_emissivity2

Material 1

Brass Polished :0.03

Emissivity for Material 1 if Use references of emissivity  for Material 1 is true.

TypeOfMaterial1

Material 2

Brass Polished :0.03

Emissivity for Material 2 if Use references of emissivity  for Material 2 is true.

TypeOfMaterial2

ε__1

1

 

Emissivity of object 1 on port a

eps1

ε__2

1

 

Emissivity of object 2 on port b

eps2

A__1

1

m2

Surface area of object 1

A1

A__2

1

m2

Surface area of object 2

A2

r__1

0.1

m

Radius of object 1, Inner

r1

r__2

0.2

m

Radius of object 2, Outer

r2

L__1

0.1

m

Length of object 1

L1

F__12

1

View factor for Radiation

F12

Gr

1

m2

Net radiation conductance between two surfaces

Gr

Use Correction input

false

If true, input of correction for Gr_act is valid

use_correction

See Also

Heat Transfer Library Overview

Multiple Overview