Calculation Of Surface Area Of Heatsink

This calculator should not be used in instances where the heat source is much smaller than the base of the heat sink.

Calculation of surface area of heatsink.

A side length. Given height h and edge length a the surface area can be calculated using the following equations. Krug december 2015. Any heat sink with a larger value of h x a will be able to produce a lower source temperature.

Next the radiation heat transfer from the area a 2 given by equation 10 is calculated. E lateral edge length. 2 u channel interior surface identification 4. 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.

H air film convective coefficient a exposed surface area of the fins. 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. The metal surface is supposed to be untreated shiny metal colour and the thickness should exceed 1 5 mm. Check out the heatsinkcalculator if you need to evaluate these smaller heat sources.

The heat transferred from the junction to case multiplied by the junction case. Estimate the overall volume of the heat sink required to cool a heat source by using the following equation. This temperature is commonly higher than the temperature of the device s exterior and its case. The stefan boltzmann constant σ has a value of 5 67 10 8 w m 2 k 4.

Heat sink design and optimization i. The highest operating temperature that a semiconductor in an electronic device can withstand is called its junction temperature. Base sa a 2. 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.

Heat sink sizing calculator rough estimate. P perimeter of the fins. Fins are used to increase heat transfer area and provide a cooling effect. Total sa a 2 2a a 2 2 h2.

S slant height. Applications of a heat sink calculator. Heat transfer by convection of a heat sink with fins calculator and equations. It is assumed that all surfaces of the heat sink are gray and.

Lateral sa 2a a 2 2 h2. Heat sink sizing calculator v4. However if h a p k is greater than 1 00 the fins will insulate and prevent heat flow. S tot total surface area.

The p rocedure for calculating the radiative heat transfer coefficient for the u channels is outlined in the book by ellison ref. Concentration of the heat source over an area much smaller than heat sink base is not taken into account in this calculator. Plate fin heat sink attached to a printed circuit board continue. S lat lateral surface area.