[Amps] Fan for SB220

[Fuqua, Bill L]

   If you would just look at the math relating the energy absorbed and radiated by an object and the object's emissivity.
This constant applies to both radiation and emission of radiant energy. 
   This discussion is acually useless because the interaction of the two tubes' anodes is very small. 
Each tube radiates much more energy in other directions in the cabinet than they radiate at each other. 
Even if the inside of the cabinet is 90% reflective the IR inside would make many reflections and each time
10%  absorbed each time. 
73
Bill wa4lav
 
________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of Adrian [vk4tux at bigpond.com]
Sent: Sunday, December 19, 2010 1:05 AM
To: amps at contesting.com
Subject: Re: [Amps] Fan for SB220

Ok a black body absorbs infra red radiation very well, but how does it
radiate it?
For it to radiate infra red radiation then it becomes red with rise in
temperature and is no longer black.

The reason black gives off heat so well is due to the immediate
convection cooling with air contact and its higher surface temperature
than other colours.

The problem with your theory is that convection heat transfer has been
misrepresented as radiated heat transfer.

To demonstrate my point please make a black heat radiator that stays
black, that I can feel the (radiated) heat from several feet away. use
whatever energy source you like, but it must stay black
at the heat source. ( No fan or air movement involved > convection).

Adrian ... vk4tux


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