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<blockquote type="cite">. And serviceability is challenging. You
need to pull the "wet" boards out, or you need to connect and
disconnect fluid connectors, etc. If you're in an environment
where you can manage that (or are forced into it by necessity),
then you can do it.<br>
</blockquote>
</p>
<p>I think everyone on this list already knows I'm no fan of mineral
oil immersion (It just seems to messy to me. Sorry, Stu), but
immersion cooling with other liquids, such as 3M Novec engineered
fluid addresses a lot of your concerns. It as a low boiling point,
not much above room temperature, and it was originally meant to be
an electronic parts cleaner (according to a 3M rep at the 3M booth
at SC a few years ago, so if you pull a component out of it, it
dries very quickly and should be immaculately clean. <br>
</p>
<p>The low boiling point is an excellent feature for heat transfer,
too, since it boils from the heat of the processor (ebullient
cooling). This change of state absorbs a lot of energy, making it
very effective at transferring heat away from the processor. The
vapor can then rise and condense on a heat exchanger with a
chilled water heat exchanger, where it again transfers a lot of
heat through a change of state. <br>
</p>
<pre class="moz-signature" cols="72">Prentice </pre>
<div class="moz-cite-prefix">On 11/05/2018 06:30 PM, Stu Midgley
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEM1RsWddaGF8f9O8LAidRVu_BShyd-F7+BSpiCpqUCxR=G=gg@mail.gmail.com">
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<div>I refute both these claims.</div>
<div><br>
</div>
<div>You DO want to run your boards immersed in coolant. It
works wonderfully well, is easy to live with, servicing is
easy... and saves you almost 1/2 your power bill.</div>
<div><br>
</div>
<div>People are scared of immersion cooling, but it isn't that
difficult to live with. Some things are harder but other
things are way easier. In total, it balances out.</div>
<div><br>
</div>
<div>Also, given the greater reliability of components you get,
you do less servicing.</div>
<div><br>
</div>
<div>If you haven't lived with it, you really have no idea what
you are missing.</div>
<div><br>
</div>
<div><br>
</div>
<div>Serviceability is NOT challenging.</div>
<div><br>
</div>
<div><br>
</div>
<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">You really
do NOT want to run boards immersed in coolant - yeah,
there's folks doing it at HPC scale<br>
<br>
Whatever the coolant, it leaks, it oozes, it gets places you
don't want it to go. And serviceability is challenging. You
need to pull the "wet" boards out, or you need to connect
and disconnect fluid connectors, etc. If you're in an
environment where you can manage that (or are forced into it
by necessity), then you can do it.<br>
</blockquote>
</div>
-- <br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">Dr Stuart Midgley<br>
<a href="mailto:sdm900@gmail.com" target="_blank"
moz-do-not-send="true">sdm900@gmail.com</a></div>
</div>
</div>
<br>
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</pre>
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