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 <[email protected]> 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 <[email protected]> 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 >> >> >> >> ______________________________**_________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. > > > > -- > > Tom Harris <[email protected]> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
