Steve Thompson wrote:
>
>
>Vic K2VCO wrote:
>> Floyd Sense wrote:
>>
>>>Most amps today use convection cooling. To me, radiation cooling would
>>>imply no airflow used and that isn't seen very often.
>>
>>
>> I would say that external anode tubes like the 3Cx800, etc. are
>> convection (or more precisely, forced-air) cooled,
>
>But doesn't convection (and forced air) start with conduction between
>the hot surface and the air - so they're all conduction cooled?
>
Not in the normal usage of those terms... but it also depends on whom
you ask.
A fluid dynamicist would describe any kind of heat transfer by a moving
fluid as "convection". An engineer would divide this into "free
convection" (driven only by buoyancy) and "forced convection".
However, both would say that "conduction" can only occur in a solid, and
thus it ends at the surface boundary.
>I'd say a 'conduction cooled' tube displaces the heat through a solid
>link to a cooled surface
Certainly, that is always what "conduction cooled tube" means.
The three classical heat transfer mechanisms are conduction, convection,
and radiation. If you look hard at any particular amplifier, and think
in detail about the way the heat is transferred away from the hot bits
(anode/collector/drain) and eventually dumped out into the surrounding
environment, you will always find that all three mechanisms are
involved.
--
73 from Ian G/GM3SEK
http://www.ifwtech.co.uk/g3sek
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