<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I think direct contact liquid cooling (DCLC)solutions from Asetek and CoolIT are much more practical, as are immersion cooling systems using 3M Novec engineered fluid. Novec is really appealing because of the heat transfer efficiency of the change of state. I believe it was originally designed as an electronic parts cleaner, too. It evaporates at room temp like other electronic cleaners, so when you pull hardware out the liquid, it's dry in a matter of seconds, and very clean, too! Much more practical than mineral oil in that regard. 3M claims it has a very low global warming factor, too.<br>
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Personally, I think DCLC since any leaks in the data center should be smaller than if a tank-like chassis springs a leak, and there one is scared of the environmental impact of water, even when antifreeze and other water treatment chemicals are added to it, as would be needed in this use case.<br></blockquote></div><div><br></div><div><br></div><div>2 phase solutions are sexy but ultimately impractical.</div><div><br></div><div> * what happens when your recondensing loop fails? and you've evaporated all the fluid off...</div><div><br></div><div> * try and get a permit to hold large volumes of it in a computer room</div><div> * try and find a computer room that will allow it in</div><div> * the above two are mostly due to the low boiling point of the fluid</div><div><br></div><div> * expensive (~ an order of magnitude)</div><div><br></div><div>AND you don't actually need a 2 phase solution to get the heat off the cpu's etc. A single phase solution works just fine.</div><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Dr Stuart Midgley<br><a href="mailto:sdm900@sdm900.com" target="_blank">sdm900@sdm900.com</a></div>
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