On Sep 27, 2007, at 10:41 AM, Larry Doolittle wrote: > > OTOH, your radiator has to get quite hot to carry away much > heat by infrared radiation. Presumably you have some airflow, > either passive (convection) or active (fan-driven). Then you > want exposed metal, and its emissivity doesn't matter much.
You'd be surprised at how much gets carried away by radiation. For things like resistors, 2X derating relative to natural convection is generally sufficient in a vacuum. But if you calculate the thermal resistance of a thin plastic film over metal, you'll find it's negligible. John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [EMAIL PROTECTED] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
