[Amps] Coolant for liquid-cooled solid-state amp

[Jim Barber]

Hi Bob, thanks for the reply.

In this particular case, the electrical conductivity of the coolant doesn't
matter as long as the cooling efficiency stays up and
the corrosion doesn't become an issue for the radiator, the baffle block or
the pump. (I assume you meant electrical conductivity, not thermal)
Would that change the equation?

Anything that contributes to the conversation and gets people thinking
contributes to the SNR... I'm no expert when
it comes to these kinds of cooling systems, so can use all the help I can
get.

Thanks!
Jim N7CXI


On Tue, Oct 8, 2019 at 9:58 AM Bob Darlington <rdarlington at gmail.com> wrote:

> Jim,
>
> Plain ol' distilled water will remove heat a lot better than diluting it
> with glycol, however the chemistry may dictate using it.  Deionized water
> is much more corrosive than distilled even if it starts life as a very poor
> conductor, but will quickly leech metal ions into the solution (although
> not much volume!) and will likely become more conductive faster than
> starting with plain distilled, but it might be a photo finish as to which
> needs to get replaced first.    Just an FYI, and I hope this has a slightly
> beneficial SNR.  If not, I apologize for taking up the space.
>
> -Bob N3XKB
>
> On Tue, Oct 8, 2019 at 10:22 AM Jim Barber <barberaudio at gmail.com> wrote:
>
>> I'm laying out a 2-module MOSFET amp, and intend to use liquid cooling.
>>
>> The last time I visited the topic, ethylene glycol antifreeze diluted with
>> the traditional 50% deionized water was the coolant of choice.
>>
>> Anything new under the sun?  I'm using propylene glycol in my laser tube
>> and CNC spindle coolers, but those don't have to be very efficient. The
>> cooling system for the amp is going to have to move some heat.
>>
>> Thanks,
>> Jim N7CXI
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