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

Radiation type

Radiation geometry

Use References

Surrounded object

Two parallel plates

Two long concentric cylinders

Concentric spheres

Material

Emissivity value

Brass Polished

0.03

Brass Oxidized 600oC

0.6

Copper electroplated

0.03

Copper Polished

0.04

Steel Oxidized

0.79

Steel Polished

0.07

Steel Galvanized New

0.23

Steel Galvanized Old

0.88

Stainless Steel, Polished

0.075

Stainless Steel, weathered

0.85

Aluminum Foil

0.04

Aluminium Heavily Oxidized

0.25

Iron, dark gray surface

0.31

Iron, plate rusted red

0.61

Cast Iron

0.65

Cast Iron, newly turned

0.44

Wrought Iron

0.94

Lead Oxidized

0.43

Carbon, not oxidized

0.81

Plastics

0.91

Rubber Nat Hard

0.91

Porcelain, glazed

0.92

Glass smooth

0.93

Paper

0.93

Symbol

Units

Description

Modelica ID

$\mathrm{Q\_\_flow}$

$W$

Heat flow rate from port a to port b

Q_flow

$\mathrm{T\_\_a}$

$K$

Temperature of port a

$\mathrm{T\_\_b}$

$K$

Temperature of port b

$\mathrm{Gr\_\_act}$

$m^2$

Net radiation conductance between two surfaces

Gr_act

$\stackrel{}{\mathrm{\σ}}$

$\frac{w}{m^2\cdot K^4}$

Stefan-Boltzmann constant 5.670373e-8

sigma

$\mathrm{\ε\_\_act1}$

Emissivity of object 1 on port a

eps_act1

$\mathrm{\ε\_\_act2}$

Emissivity of object 2 on port b

eps_act2

Name

Units

Condition

Description

Modelica ID

$\mathrm{port\_a}$

-

-

Thermal port, a

port_a

$\mathrm{port\_b}$

-

-

Thermal port, b

port_b

$\mathrm{Gr\_\_in}$

$m^2$

if Radiation type is
External input.

Input signal of the heat transfer coefficient

Gr_in

$\mathrm{cor}$

-

if Use correction input is
true.

Input signal of the correction factor for $Q_{\mathrm{flow}}$

cor

Symbol

Default

Units

Description

Modelica ID

$\mathrm{Radiation} \mathrm{Type}$

$\mathrm{General}$

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

$\mathrm{Radiation} \mathrm{Geometry}$

$\mathrm{Surrounded} \mathrm{object}$

Geometry type of Radiation.

RadiationGeometry

$\mathrm{Use} \mathrm{references} \mathrm{of} \mathrm{emissivity} \mathit{for}\mathit{ }\mathrm{Material1}$

$\mathrm{false}$

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

use_reference_emissivity1

$\mathrm{Use} \mathrm{references} \mathrm{of} \mathrm{emissivity} \mathit{for}\mathit{ }\mathrm{Material2}$

$\mathrm{false}$

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

use_reference_emissivity2

$\mathrm{Material} 1$

$\mathrm{Brass} \mathrm{Polished} \:0.03$

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

TypeOfMaterial1

$\mathrm{Material} 2$

$\mathrm{Brass} \mathrm{Polished} \:0.03$

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

TypeOfMaterial2

$\mathrm{\ε\_\_1}$

$1$

Emissivity of object 1 on port a

eps1

$\mathrm{\ε\_\_2}$

$1$

emissivity of object 2 on port b

eps2

$\mathrm{A\_\_1}$

$1$

$m^2$

Surface area of object 1

A1

$\mathrm{A\_\_2}$

$1$

$m^2$

Surface area of object 2

A2

$\mathrm{r\_\_1}$

$0.1$

$m$

Radius of object 1, Inner

r1

$\mathrm{r\_\_2}$

$0.2$

$m$

Radius of object 2, Outer

r2

$\mathrm{L\_\_1}$

$0.1$

$m$

Length of object 1

L1

$\mathrm{F\_\_12}$

$1$

View factor for Radiation

F12

$\mathrm{Gr}$

$1$

$m^2$

Net radiation conductance between two surfaces

Gr

$\mathrm{Use} \mathrm{Correction} \mathrm{input}$

$\mathrm{false}$

If true, input of correction for Gr_act is valid

use_correction