On Saturday 07 November 2020 23:38:28 Chris Albertson wrote: > I had a water cooling setup at my place for a few years. I used the > minimum amount of plain old automotive antifreeze which is "not much" > here in California. But even if it never gets cold here, the > antifreeze keeps stuff from growing in the tank. > > Then to take care of Gene's problem with "gunk" in the tank I set up > an ordinary aquarium filter. It ran 24x7 even when the system was not > in use. These small filters can be small and only use 3 watts of > power or larger and use much more. But with no fish in the tank, > there is not much to filter out of the water. A cheap filter keeps > the tank clean. > > My use of water cooling was when I was developing an astronomical > camera. The CCD chip was cooled to near-cryogenic temperature and kept > in a vacuum to prevent it from icing over. "Noise" in electronics is > dramatically reduced by temperature. This camera was literally > counting photons from stars and thermal noise would have "swamped" the > small signal. I had a development copy at home for software > development. (ok to head off the question of how to get very low > temperature with ware cooling -- thermoelectric devices were stacked > with the last device bonded to the water cooling block. > > In any case, I never had an issue with the water not being perfect. > My system used a 50 gal aquarium tank and pumps and filters repurposed > from one of my salt-water aquariums. In the case of an aquarium with > no fish, use a small pump that re-circulates the entire tank volume > perhaps one per hour, and let it run 24x7. So even a 50 gal tank only > needs a 1 gal per minute water pump.
Two pumps in the tank would likely heat it pretty warm if one ran continuously. These pumps are 10 to 25 watts. OTOH, it wouldn't freeze since power failures are 5 second affairs due to a 20kw standby. The existing pump comes on with the spindle motor drive. Right ow the flow thru the motor is quite restricted, and 50C pink water comes back from the motor in just 2 minutes at the starting speed of 2k revs on a 24k motor. And the motor is getting warm rapidly. So I need something that will also chemically clean that crap out of the motor. I'll check at wallies and see if they have something to clean that crap back out of an rv's water system. > > Other people were smarter than me. Seeing as a development system is > only runs a few hours for testing they used a MUCH simpler system: A > garden hose connected to the input of the cooling block and the output > was let to a flower bed. No pumps, no filters. That would work nice if I had water in the garage. Unforch, the nearest water pipe is 20 feet thru the house away. I found it in a wall while I was redecorating in 2004, and hooked it up to a frost free on the front of the house. Thanks Chris. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
