Thermal resistance#

The Thermal resistance block simulates heat transfer in a general form, regardless of simulated heat exchange type.

The equation for heat flux is (1):

(1)#\[Q=\frac{T_1-T_2}{R}\]

where:

\(R\) - thermal resistance;

\(T_1\) – temperature at the block inlet;

\(T_2\) – temperature at the block outlet.

Relation of thermal resistance to other characteristics (2):

(2)#\[R=\frac{b}{\lambda \cdot F}=\frac{1}{\alpha \cdot F}=\frac{1}{k\cdot F \cdot (T_1^2+T_2^2)\cdot (T_1+T_2)}\]

where:

\(b\) - distance between design layers;

\(\lambda\) - thermal conductivity coefficient of the material;

\(F\) - surface area of the heat exchange;

\(k\) - radiation coefficient.

Type of thermal resistance

The user can choose the type of thermal resistance:

Constant - The thermal resistance is specified in the block properties.
Variable - thermal resistance is set through the block port and can be a function of time.

1. Properties#

Property	Default value	Description	Units of measurement
Thermal resistance type: Constant; Variable	Constant	-	-
Thermal resistance	10.0	Available, when `Thermal resistance type` - `Constant`	°C/W

Parameters	Input/Output	Description	Units of measurement	Port type
Thermal resistance	Input	Available, when `Thermal resistance type` - `Variable`	°C/W	Automation
Input	Input	-	-	Heat exchange
Output	Output	-	-	Heat exchange

In order to see the connection capabilities of the block, you need to go to page Description of block ports