[TenTec] Delta II Cooling Fan

[Jeff Modlin]

Mitch,

HVAC convention is to have cooling fans suck the air over the heat
source.  The simple reason is that the heat generated by the motor and
the friction losses in the machine add energy to air and consequently
raise the temperature.  So the air being pushed by a fan has slightly
more energy in it than air pulled by a fan.

All of this being said and referencing KE4TEG's reply, having the fan
pulling air over the fins is better as long as the fan is on.  If for
the sake of noise reduction or any other reason, the fan is switched
off; its presence will impede cooling.


73 de Jeffrey Modlin
KD4ZNC in Coral Springs, Florida  USA





-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com] On Behalf Of Mitch Alexander
Sent: Sunday, March 02, 2003 6:34 PM
To: tentec at contesting.com
Subject: Re: [TenTec] Delta II Cooling Fan


Hi, Guys --
Just relaxing after the contest weekend.  It's not 0:00 yet, but I'm
finished.  Whew !!
I've always wondered which is the correct mounting for a cooling fan --
blowing cool air onto the heat sink, or drawing the heat away?  In other
words, blowing in or blowing out ?  I have muffin fans on the top of my
amp drawing the air out of the tube chimneys -- same principal for heat
sinks, or not?
cheers--
Mitch Alexander -- KJ4DX
 
 Greg Breeden <gbreeden at pivot.net> wrote:List,

I am looking for a cooling fan for my Delta II. It looks as though any
fan
would work, provided it would fit the pre drilled screw holes in the
heat
sink and was 12 volts.

Can anyone direct me to a good source for this fan, or even the factory
fan
which you would part with at a reasonable cost.

Greg, AL0A

in Maine where it is snowing again...

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