Hi Gary, from Gary :)
The condensation problem is real, but is solved commercially by insulating
and sealing the cold side of the system.
The hot side is remoted, to the outside of the case, using the (insulated)
cold water tubes. Then, the heat is rejected using a large enough heatsink,
with natural convection, thus no noise. The tiny water pump involved makes
no noise you can detect.
Regards,
Gary
AA2IZ
----- Original Message -----
From: "Gary Smith" <mandolinist@ameritech.net>
To: "Gary Hoffman" <ghoffman@spacetech.com>; <tentec@contesting.com>
Sent: Monday, January 19, 2004 7:22 PM
Subject: Re: [TenTec] Quieting fan
> One of the problems people using the Peltier chips for cooling is that the
> hot side stil needs to be cooled and if you use a fan on that you'll be
> defeating the noise issue. In the computer most people do it so as to
> overclock the processor and not have any heat problem to deal with
> whatsoever. Many people use the Peltier chip cool side on the processor
> and then use a water cooling block on the hot side of the processor
> because the water removes the heat so efficiently compared to air..
>
> Another problem with the Peltier chips is condensation that happens due
> to the heat & cold plates being so close together. There's ways of
> reducing the problem but I've avoided it since condensation will happen
> and droplets of water will eventually be produced.
>
> My Corsair II never gets so hot I have a problem so it's silent. Same with
> the TR-7. I suspect if I were to be in a RTTY contest I'd have a problem
> though at full bore.
>
> Gary
> ka1j
>
> > The problem with air is that to cool a space as small as a chip, and
> > yet remove perhaps 80 watts of power from that confined space,
> > requires substantial amounts of air. This is more than can be moved
> > through the small passages unless you use high pressure. The
> > thermodynamics just don't work out.
> >
> > That's why you use liquids instead. Of course, you must use materials
> > (additives) that prevent the growth of the green things (although of
> > course actual green stuff doesn't grow in the absence of light).
> > Still, other things do grow, but additives prevent this.
> >
> > A good source of chilling is to use a Thermoelectric cooler. This is
> > easily done with the DC power supplies we all have in the shack. -----
> > Original Message ----- From: "Martin Ewing" <martin@aa6e.net> To:
> > "Gary Hoffman" <ghoffman@spacetech.com>; <tentec@contesting.com> Sent:
> > Monday, January 19, 2004 6:54 PM Subject: Re: [TenTec] Quieting fan
> >
> >
> > > This seems off-topic, but anyway...
> > >
> > > Some of the larger xmtr tubes have water cooling jackets; they must
> > predate the
> > > PC. So, nothing new here, except applying it to transistor finals.
> > >
> > > You need a source of "chilled water" for this technique. You have
> > > to
> > worry
> > > about green stuff growing in the water, spills, etc.
> > >
> > > I have toyed with the idea of making an air distribution system,
> > > with a
> > squirrel
> > > cage blower/compressor in an acoustically isolated place. Pump in
> > > large
> > volume,
> > > relatively low pressure air instead of making noise with small fans.
> > > This
> > is
> > > pipe organ technology.
> > >
> > > Has anyone done it in a ham environment?
> > >
> > > 73 - Martin AA6E
> > >
> > > Gary Hoffman wrote:
> > > > I design these kinds of things. Much more compact than a heater
> > > > core,
> > and
> > > > no fan, and much cooler.
> > > >
> > > > ok....end of shameless plug ! :)
> > > >
> > > > Seriously, these work for radios too, and you can totally get rid
> > > > of
> > fans if
> > > > you want to.
> > > >
> > > > Regards,
> > > >
> > > > Gary
> > > >
> > > > ----- Original Message -----
> > > > From: "Gary Smith" <mandolinist@ameritech.net>
> > > > To: <tentec@contesting.com>
> > > > Sent: Monday, January 19, 2004 5:20 PM
> > > > Subject: Re: [TenTec] Quieting fan
> > > >
> > > >
> > > >
> > > >>I rarely chirp in but I do as many "power" computer users do &
> > > >>that's "water cooling" on my computer. There's a large market for
> > > >>these kind of heat sinks & in short what is done is to have water
> > > >>replace air as the
> > > >
> > > > heat
> > > >
> > > >>sink cooling media. An in-line water pump pushes water through the
> > > >>"water block aka heat sink" and it's cooled remotely by a 120MM
> > > >>fan blowing through an automotive heater core.
> > > >>
> > > >>Water is far more efficient than air for cooling so you get
> > > >>temperatures
> > > >
> > > > of
> > > >
> > > >>about 4 degrees C maximum over ambient room temperature from a
> > > >>processor running 80 watts.
> > > >>
> > > >>Yeah... I know it's too much for most people to deal with & no,
> > > >>you
> > don't
> > > >>get water inside your equipment... but your computer is dead
> > > >>silent except for the sound of the drives. If you were to do this
> > > >>with a radio it would be the same, no fan noise.
> > > >>
> > > >>Do a google search for water cooling on computers & you'll enjoy
> > > >>the
> > read.
> > > >>
> > > >>Gary
> > > >>ka1j
> > > >>
> > > >>Also, if someone knows the whereabouts of an Alpha 77SX with the
> > > >>serial 2931 it's mine & I want it back. I sent it to Alpha when it
> > > >>was owned by ETO & it was never returned after they moved from
> > > >>Colorado Springs. Yes, I have all the documentation.
> > > >>
> > > >>
> > > >>
> > > >>>Hi,
> > > >>>
> > > >>>I lost the message that I am referring to. Someone said they put
> > > >>>a resistor in series with the fan motor in order to make it run
> > > >>>quieter. How do you determine that there is still sufficient air
> > > >>>flow to properly cool the tubes? What about in a warmer time of
> > > >>>year? What if you (or future owner of the amplifier, or would it
> > > >>>be ampli-fire) moved to a higher altitude QTH and left the
> > > >>>resistor in circuit? I understand the desire to make the
> > > >>>amplifier run quieter, but obviously there are other important
> > > >>>considerations. You could just disconnect the fan altogether and
> > > >>>it would be silent, but of course then it would not perform it's
> > > >>>intended purpose.
> > > >>
> > > >>Gary
> > > >>
> > > >>Gary Smith
> > > >>CQ DX de KA1J
> > > >>http://musician.dyndns.org
> > > >>http://musician.dyndns.org/homebrew.html
> > > >>
> > > >>If you pick up a starving dog and make him prosperous, he will not
> > > >>bite you. This is the principal difference between a dog and a
> > > >>man.
> > > >>
> > > >>- Mark Twain -
> > > >>
> > > >>
> > > >>_______________________________________________
> > > >>TenTec mailing list
> > > >>TenTec@contesting.com
> > > >>http://lists.contesting.com/mailman/listinfo/tentec
> > > >>
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > TenTec mailing list
> > > > TenTec@contesting.com
> > > > http://lists.contesting.com/mailman/listinfo/tentec
> > >
> > >
> > >
> >
> >
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
> Gary
>
> Gary Smith
> CQ DX de KA1J
> http://musician.dyndns.org
> http://musician.dyndns.org/homebrew.html
>
>
> "Give a man a beer and he'll drink for five minutes.
> Teach him where the beer is, he'll drink for a lifetime and get it
himself".
>
>
>
>
>
>
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|