On Thursday, January 05, 2012 12:54:56 PM Dave did opine: > On 1/5/2012 11:29 AM, Kent A. Reed wrote: > > On 1/5/2012 11:07 AM, Dave wrote: > >> On 1/5/2012 8:45 AM, andy pugh wrote: > >>> On 5 January 2012 13:41, Edward Bernard<yankeelena2...@yahoo.com> wrote: > >>>> How do you deal with cooling issues having all that gear in one > >>>> enclosure? > >>> > >>> I don't know yet. > >>> The actual servo drives will be external (and near the motors) > >>> though, so the only heat in there should be from the low-power > >>> motherboard. > >> > >> If the surrounding environment is not too hostile, the easiest way is > >> to blow air through the box - like a PC. The MW525 does not > >> require a fan so if you create a breeze across > >> the heat sink it should be cooled sufficiently in even a hot > >> environment. If everything is in a sealed box the only alternative > >> is to blow air across the components inside the box and make sure > >> the box is large enough to become warm yet dissipate the heat > >> into the cooler surrounding air. A MW525 system throws off about 20 > >> watts of heat. > >> > >> I recently bought some of these to help keep dust and dirt out of a > >> PC enclosure in dirty environment. Along with a good 120 mm fan, > >> something like this would be useful in some industrial environments > >> to ventilate a cabinet with filtered air. > >> http://www.tigerdirect.com/applications/searchtools/item-details.asp? > >> EdpNo=5554585&SRCCODE=WEBLET03ORDER&cm_mmc=Email-_-WebletMain-_-WEBLE > >> T03ORDER-_-Deals > >> > >> The Intel bios has a display that will show you the CPU core > >> temperature so you can get an idea of how efficiently your enclosure > >> is keeping your PC boards cool. > >> > >> Dave > > > > Gentle persons: > > > > Watercooling is the cats meow in high-end gaming systems. My local > > Microcenter has a whole aisle devoted to aftermarket add-ons like > > pumps, heat exchangers, tubing in disco colors, etc., (with or > > without the attendant lowrider lighting!). > > > > Apart from our natural conservatism, is there any reason y'all with > > big systems aren't watercooling within a sealed box, piping the heat > > to an external radiator? > > > > Regards, > > Kent > > It really isn't just a CPU cooling issue. Usually the entire enclosure > needs to be cooled. The cheap industrial way to cool a cabinet is to > use a Exair type vortex compressed air powered cooler. They are > relatively cheap, and bulletproof, but they eat a lot of compressed air. > But if you have a lot of compressed air available, then that can be a > good solution. > > In general, I like to keep water away from electronics and high > voltages... :-) > > Although... the low rider lighting is attractive.. ;-) > > I have worked on a few high power induction heating units that use water > to cool just about everything, including the power conductors. I find > them a bit scary. 480 volts, SCRs the size of hockey pucks, mixed with > hoses and water all in the same cabinet! > > I close the cabinet and stand around the corner when I throw the > disconnect switch on after a repair. > > Dave
Our old transmitter was a bit like that, used a water cooled triode tube for a final amp, so the water hookup came from the hoses attached to 1" gate valve faucets on the bottom of the socket that had 7200 volts present, and rode in insulated brackets about 3" from the cabinet walls up to the flow gages and a short section of pipe inserted into the hoses 2" from the grounded 2" copper plumbing that had a 50 ma full scale meter from that piece of pipe to ground that gave us an indication of the waters purity by showing the leakage current. Early on I installed a culligan deionizer system as a bypass treatment, running a stream tapped off the top of the 15 hp pump, using 50' of icemaker hose as a flow restrictor, and dumped that back into the 200 gallon storage tank after it came thru the deionizer. Before then, we were replacing the hoses and hose barbs at 6 month intervals because using only distilled water as evaporation make up let it get dirty enough that electrolysis was eating the hose barbs away in about 9 months. After putting in the deionizer, I was able to replace the meter with a 10 ma movement, and it was time to get the cartridge recycled when it was showing .1 ma of leakage current. The hoses and barbs in it right now are the same as when we turned it off in June 2008 & they were then about 10 years old, still in good condition. In fact, I hope the water was drained. The building hasn't been heated since because we moved the transmitter to Clarksburg with the digital changeover. Things did get interesting once as we always bought the replacement hosing from a mining supply company locally, and one time when I went up and got the usual 50 feet, they subbed an anti-static semiconductor hose for the 1" bore 300 psi stuff I normally used. Same identical bright yellow color and all. Put it in, filled it up with water and fired it up. About 30 seconds later we could smell hot rubber, so I killed the high voltage and opened the door to see if I'd left it where the fan motors could rub on it or ?? I found that anti-static hose had gotten so hot in that 30 seconds with 7200 volts from end to end that it was imitating a soaker type garden hose! Finally read that line of text rolled onto the side of the hose. Oooops... This was about 5 am, & I had to wait for that mining supply to open for the day so I could get the Right Stuff this time, did, and put it in, finally getting enough water (we had emptied our two big garbage cans of spare good water filling it the first time) in the system by jury rigging the deionizer to feed it cistern water about an extra hour just to make enough good water to work. I was about 1'ish in the afternoon getting us back on the air, and one damned tired puppy by then. But lesson learned too. :( Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> I finally went to the eye doctor. I got contacts. I only need them to read, so I got flip-ups. -- Steven Wright ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
