[Amps] Black heat shields

[Fuqua, Bill L]

Bare Aluminum if real can make a real good IR reflector. If you can make it so that it reflects the IR to the case it may work even better.

73
Bill wa4lav
________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of Fuqua, Bill L [wlfuqu00 at uky.edu]
Sent: Saturday, December 18, 2010 11:33 PM
To: Jim  Garland; 'Paul Kraemer'; amps at contesting.com
Subject: Re: [Amps] Black heat shields

yes but the temperature of the alu. sheet is much less than the tube still and the the heat absorbed by the
aluminum sheet is related to its temperature in Kevin raised to the 4th power. So if it does rise
50 or 70 degrees C it will not change its ability to absorb heat by much.

73
Bill wa4lav

________________________________________
From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of Jim  Garland [4cx250b at muohio.edu]
Sent: Saturday, December 18, 2010 10:53 PM
To: 'Paul Kraemer'; amps at contesting.com
Subject: Re: [Amps] Black heat shields

Hi Paul,
Yes, if the shield is bonded to the chassis, and as long as the chassis is
at a lower temperature than the shield, then there will be a heat flow to
the chassis. However, the devil is in the details, and if the shield and the
chassis are made of aluminum, say .063" thick, then I'd guess the thermal
transfer would be small compared to the heat generated by the tubes.
>
> The heat shield is bonded to the chassis. Won't that pull heat from the
> shield?
> Paul K0UYA
> ----- Original Message -----
> From: "Jim Garland" <4cx250b at muohio.edu>
> To: <amps at contesting.com>
> Sent: Saturday, December 18, 2010 8:40 PM
> Subject: [Amps] Black heat shields
>

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