S slant height.
Calculation of surface area of heatsink.
The stefan boltzmann constant σ has a value of 5 67 10 8 w m 2 k 4.
Any heat sink with a larger value of h x a will be able to produce a lower source temperature.
Krug december 2015.
Heat transfer by convection of a heat sink with fins calculator and equations.
Check out the heatsinkcalculator if you need to evaluate these smaller heat sources.
Plate fin heat sink attached to a printed circuit board continue.
The highest operating temperature that a semiconductor in an electronic device can withstand is called its junction temperature.
Is the convection coefficient of the heat sink is the total surface area of the heat sink is the temperature of the source being cooled is the ambient temperature.
S lat lateral surface area.
The variables ε is the surface emissivity of the heat sink.
2 u channel interior surface identification 4.
A side length.
The metal surface is supposed to be untreated shiny metal colour and the thickness should exceed 1 5 mm.
H air film convective coefficient a exposed surface area of the fins.
However if h a p k is greater than 1 00 the fins will insulate and prevent heat flow.
Where a hs is the surface of the metal plate in cm 2 and r th hs a is the thermal resistance from the heat sink to the ambient in c w.
Given height h and edge length a the surface area can be calculated using the following equations.
Concentration of the heat source over an area much smaller than heat sink base is not taken into account in this calculator.
Fins are used to increase heat transfer area and provide a cooling effect.
Heat sink design and optimization i.
Heat sink sizing calculator rough estimate.
The p rocedure for calculating the radiative heat transfer coefficient for the u channels is outlined in the book by ellison ref.
Estimate the overall volume of the heat sink required to cool a heat source by using the following equation.
It is assumed that all surfaces of the heat sink are gray and.
The heat transferred from the junction to case multiplied by the junction case.
This temperature is commonly higher than the temperature of the device s exterior and its case.
This calculator should not be used in instances where the heat source is much smaller than the base of the heat sink.
P perimeter of the fins.
Base sa a 2.
S tot total surface area.
Typical values are listed in the article the importance of radiation in heat sink design.
E lateral edge length.
The surface area of a square pyramid is comprised of the area of its square base and the area of each of its four triangular faces.
Total sa a 2 2a a 2 2 h2.
Applications of a heat sink calculator.
Please use our online heat sink calculator for this step.
