• 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

    By using this website you agree to our Cookies usage. We and our partners operate globally and use cookies, including for analytics, personalisation, ads and Newsletters

    1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies.
      Dismiss Notice