Heat sink sizing calculator rough estimate.
Calculation of surface area of heatsink.
The heat transferred from the junction to case multiplied by the junction case.
Fins are used to increase heat transfer area and provide a cooling effect.
S tot total surface area.
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.
Next the radiation heat transfer from the area a 2 given by equation 10 is calculated.
Plate fin heat sink attached to a printed circuit board continue.
Heat sink sizing calculator v4.
The metal surface is supposed to be untreated shiny metal colour and the thickness should exceed 1 5 mm.
This temperature is commonly higher than the temperature of the device s exterior and its case.
It is assumed that all surfaces of the heat sink are gray and.
2 u channel interior surface identification 4.
Any heat sink with a larger value of h x a will be able to produce a lower source 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.
Check out the heatsinkcalculator if you need to evaluate these smaller heat sources.
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.
The stefan boltzmann constant σ has a value of 5 67 10 8 w m 2 k 4.
Typical values are listed in the article the importance of radiation in heat sink design.
Estimate the overall volume of the heat sink required to cool a heat source by using the following equation.
A side length.
Concentration of the heat source over an area much smaller than heat sink base is not taken into account in this calculator.
S slant height.
S lat lateral surface area.
Given height h and edge length a the surface area can be calculated using the following equations.
The highest operating temperature that a semiconductor in an electronic device can withstand is called its junction temperature.
Krug december 2015.
Heat transfer by convection of a heat sink with fins calculator and equations.
However if h a p k is greater than 1 00 the fins will insulate and prevent heat flow.
Please use our online heat sink calculator for this step.
H air film convective coefficient a exposed surface area of the fins.
Total sa a 2 2a a 2 2 h2.
P perimeter of the fins.
The variables ε is the surface emissivity of the heat sink.
Lateral sa 2a a 2 2 h2.
E lateral edge length.
Applications of a heat sink calculator.
Heat sink design and optimization i.