[TenTec] Is there a beefier 2N5301?

[Gary Hoffman]

Hi Jerry,

Nope...a properly designed TEC cooler is very efficient.  My designs usually
operate at a COP of between 3 and 7.  Its a common myth that TEC coolers
operate at a COP of near unity or less.   (COP = Coefficient of performance
which is cooling power accomplished divided by electric power used to
accomplish it)  That's for those other than Jerry who might not know the
acronym.

Yes, the heat does finally have to get out to the air via a sink...but the
key is that the transistor no longer sees the high temp of that sink.

73 de Gary, AA2IZ


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: <tentec at contesting.com>
Sent: Tuesday, March 06, 2007 8:50 PM
Subject: Re: [TenTec] Is there a beefier 2N5301?


> On Tue, 2007-03-06 at 18:59 -0500, Gary Hoffman wrote:
> > Active cooling might well be an answer.  Not just a fan, but how about a
TEC
> > device ?  If there were wide enough interest I could perhaps offer a
design
> > as this sort of thing is what I do (thermodynamics).
> >
> > 73 de Gary, AA2IZ
> >
> There may be more efficient and economical techniques. Such as low drop
> regulators using MOSFETs or going to switching supplies. Wouldn't moving
> 100 watts average from a pass transistor require more than 100 watts of
> input power to the TEC that still has to be dissipated at the hot side
> of the TEC in addition to the heat from the pass transistor?
> -- 
> 73, Jerry, K0CQ,
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>