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1. Re: [Amps] making sinks black (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Sat, 22 Jul 2006 11:33:45 -0500; "...what difference does it make what color it has as to the heat it will dissipate?" A big difference, if you don't use forced air flow. Black bodies radiate and absorb heat many times more efficien; /archives//html/Amps/2006-07/msg00873.html (6,907 bytes)
2. Re: [Amps] making sinks black (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Sat, 22 Jul 2006 12:57:06 -0400; I have heard it said that this is largely true at extreme temperatures. Might be nice to have someone dissipate a "real world" amount of power (say 100 watts) in a heat sink of raw aluminum and do it; /archives//html/Amps/2006-07/msg00877.html (7,795 bytes)
3. Re: [Amps] making sinks black (score: 1): Author: "" <dcoffman@iquest.net>; Date: Sat, 22 Jul 2006 12:57:54 -0400; Thanks for the information. I never thought of it like that. I would just be worried that a layer of primer and a layer of paint would lessen the heat transfer effect. I think I would opt for anodize; /archives//html/Amps/2006-07/msg00878.html (8,105 bytes)
4. Re: [Amps] making sinks black (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 22 Jul 2006 18:03:06 +0100; It will depend a lot on the situation - reasonable convection will dominate over radiation, so black won't make much difference where there's forced air, or vertical orientation with free airflow. Ma; /archives//html/Amps/2006-07/msg00879.html (8,442 bytes)
5. Re: [Amps] making sinks black (score: 1): Author: "slifamily" <slifamily@earthlink.net>; Date: Sat, 22 Jul 2006 13:11:10 -0400; I have heard it said that this is largely true at extreme temperatures. Might be nice to have someone dissipate a "real world" amount of power (say 100 watts) in a heat sink of raw aluminum and do it; /archives//html/Amps/2006-07/msg00882.html (8,169 bytes)
6. Re: [Amps] making sinks black (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 17:00:47 -0400; That might be true. Very often the largest portion of cooling is through contact with moving air. This is the same as several others have said, but it might be useful to repeat it anyway in differen; /archives//html/Amps/2006-07/msg00896.html (8,136 bytes)
7. Re: [Amps] making sinks black (score: 1): Author: "S. J. Blackwell" <w5lu@hotmail.com>; Date: Sat, 22 Jul 2006 18:33:33 -0500; Tom, I agree with your statements below. The color has very little to do with heat sinks that we deal with. Most heat sinks now days have relatively tall closely spaced fins. For practical porposes t; /archives//html/Amps/2006-07/msg00897.html (10,042 bytes)
8. Re: [Amps] making sinks black (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 22 Jul 2006 20:47:02 -0400; Excellent point! Thanks for opening my eyes on this. The interesting thing is this is how grounding systems and antennas work also. Radiation from an antenna has nothing to do with how much stuff yo; /archives//html/Amps/2006-07/msg00898.html (8,265 bytes)
9. Re: [Amps] making sinks black (score: 1): Author: "Dr. David Kirkby" <david.kirkby@onetel.net>; Date: Sun, 23 Jul 2006 03:15:27 +0100; I think you will find the *radiation* from a heat sink is going to be very small indeed. It will not depend the slightest on airflow. *Convection* will be the dominant method of loosing heat, which w; /archives//html/Amps/2006-07/msg00903.html (9,455 bytes)
10. Re: [Amps] making sinks black (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 23 Jul 2006 08:08:41 +0100; If the fins are too close together, then the convection airflow between them can get choked with turbulence and, again, the heat loss ends up little better than a solid block. I tried an experiment; /archives//html/Amps/2006-07/msg00915.html (8,816 bytes)
11. Re: [Amps] making sinks black (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 23 Jul 2006 09:36:46 +0200 (CEST); Somewhen back in the early 1970's (showing my age!) there was an article in one of the professional UK electronics magazines (long defunct). The people had done work on heat transfer from heat sinks.; /archives//html/Amps/2006-07/msg00917.html (9,636 bytes)

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