It actually takes supprisingly little water flow to dissipate 5 kW. Very roughly 5 kW = 1250 cal/sec (4.18 J/cal)
so, for a 1 C degree = 1.25 liters/sec at 50C degrees = 25 mL / sec. = 1.5 L/min. -John ====================== > 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. > > _______________________________________________ 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.
