[time-nuts] OT question about liquid cooling

bownes bownes at gmail.com
Wed Oct 3 19:50:29 EDT 2012


BWIWY (back when I was young) we needed a dummy load for a supercomputer (think Cray YMP size) that drew many many kw. 

Our test load was about 250' of 3/4" copper tubing coiled at about 12" dia and 1" spacing. The load was varied by changing where the + and - leads were bolted onto the coil with u bolts. 

The whole mess was cooled by running water through it. A hose barb on the input connected up to the cold water supply and the output was run into a drain. You had too little resistance dialed in when all thy came out the output end was steam. :)

Anyway such a test load could be replicated using 1/4" ice machine copper tubing available at the hardware store, some hose clamps, and or hose barbs.

Bob

On Oct 3, 2012, at 19:35, Tom Harris <celephicus at gmail.com> wrote:

> My day job is large industrial power supplies. The test racks have large
> resistive loads with big fans exhausting to the outside. Cheap & simple.
> Safety is by several strings of temperature cutouts wired in series. We
> usually get work experience students in to wire them up.
> 
> Tip: to make a funny valued power resistor, just get the next value up and
> wrap some nichrome wire around it to bring it down to the correct value.
> 
> I met an engineer who made a battery charger for one of our submarines.
> This was tested by putting the load bank in a dumpmaster, and keeping it
> filled up with water using a firehose!
> 
> On 4 October 2012 02:01, Javier Herrero <jherrero at hvsistemas.es> wrote:
> 
>> Hello all,
>> 
>> Please excuse me for the OT, but since this list is plenty of very
>> knowledgeable colleagues, I'm tempted to ask...
>> 
>> I need to cool several resistive loads, in the order of 5kW, and I plan to
>> use a cold plate and a liquid-to-liquid heat exchanger like the Lytron
>> LCS-20, but this unit is quite big, and an overkill (it has 20kW
>> capability).
>> 
>> If someone could suggest me a smaller liquid-to-liquid heat exchanger, and
>> preferably a rack mount unit (and share any experience), it would be most
>> welcome.
>> 
>> Since this has not too much to do with time and frequency, please answer
>> off list.
>> 
>> Thank you very much! Best regards,
>> 
>> Javier
>> 
>> 
>> 
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> 
> 
> -- 
> 
> Tom Harris <celephicus at gmail.com>
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