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