Calculator for the thermal resistance in a heat flux channel with a discrete heat source in one surface facing an isothermal surface at the opposite surface.

Related links
Thermal design for electronics
Thermal online tools
Unit conversion
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General

The thermal resistance can be based on either the maximum or the average temperature of the heat source.

There are 3 calculation possibilities:

Accurate, an analytical solution 45 degree rule, the 45 deg spread angle approach Quad approx, a more sophisticated spread angle approach

Parts of the theory is explained in the The 45-degree Rule and Spread Angels, Part 1 articles.

Body

X-width is the width in the X-direction.

Y-width is the width in the Y-direction.

Height start is the low height value for the calculation.

Height end is the high height value for the calculation.

Conductivity is the thermal conductivity of the body.


Source

X-width is the width in the X-direction.

Y-width is the width in the Y-direction.


Note

Clicking in the diagram opens a panel with tabled results that can be copied and pasted into a spread sheet.