• Welcome to engineeringclicks.com
  • Thermal problem: Designing an aluminium heatsink?

    Discussion in 'The main mechanical design forum' started by kenny82, Oct 19, 2009.

    1. kenny82

      kenny82 Well-Known Member

      Joined:
      Aug 2009
      Posts:
      50
      Likes Received:
      0
      I need some help with a thermal question...

      I am trying to design an aluminium die casting. It is for an enclosure but will have a PCB screwed to its inside face. The outside face must act as a heatsink.
      I have two questions:

      1) If I need to dissipate 20W of heat from that PCB, what should the heatsink “fin†dimensions be like (thickness ad height), and what should their spacing be? I need to ensure optimal performance, but don’t know how to best to design a heatsink. Is there a standard formula or standard rules for designing such a thing?

      2) Secondly, I have seen heatsinks that have “pins†instead of “finsâ€. How much better is the performance of pins compared to fins? I presume pins are better because they have more surface area? How could I calculate the geometry of the pins to ensure optimal performance?

      Any help appreciated. :)
       
    2.  
    3. bigbamboo

      bigbamboo Guest

      Do you have an airflow or is it free convection.
       
    4. kenny82

      kenny82 Well-Known Member

      Joined:
      Aug 2009
      Posts:
      50
      Likes Received:
      0
      Its for the outdoors so there will be some airflow but I want to design for zero airflow to be considering the worst situation possible. I already design a heatsink - it seems to work ok but I would still like an answer to my original question because maybe I can optimise it.,
       
    5. mvalenti

      mvalenti Well-Known Member

      Joined:
      Nov 2009
      Posts:
      257
      Likes Received:
      0

    Share This Page