[Elecraft] OT: The Great KPA Fan Mystery

[Clay Autery]

Wayne is correct....  (of course).  Thermal performance VERY often runs 
altogether in opposition to intuitive thinking on the application.

______________________
Clay Autery, KY5G
(318) 518-1389

On 04/30/20 14:06, Wayne Burdick wrote:
> For each product, we experimented with air flow direction and many other variables. The current configurations produced the fastest and most consistent cooling.
>
> 73,
> Wayne
> N6KR
>
>
>> On Apr 30, 2020, at 12:01 PM, Andy Durbin <a.durbin at msn.com> wrote:
>>
>> "Why does the KPA500 suck air from the top vents and blow it out the back"
>>
>> I asked quite a while ago what thermal analysis had been performed on the KPA500 and got no answer here.   It would seem reasonable for the fan to augment natural convection rather than oppose it.
>>
>> Kenwood built a batch of TS-590SG with the fans installed backwards but eventually they corrected the mistake in production.  I don't think Elecraft ever decided the KPA500 fan was the wrong way round.
>>
>> Now for a KPA500 mystery question - does heat flow from the Z bracket into the heatsink or does it flow from the heatsink to the Z bracket?
>>
>> 73,
>> Andy, k3wyc