Brian Last-Name wrote: >> Date: Fri, 22 Aug 2008 14:36:25 -0500 >> From: [EMAIL PROTECTED] >> To: [email protected] >> Subject: Re: [Prime] cooling issues >> >> Brian Last-Name wrote: >>> A fan is just a device that creates a pressure differential. If you >> A fan is a device which creates a certain air flow. > > Yes, you are right. My bad.
I didn't mean to sound like I was slapping you on the hand. Sorry if I was a little too direct. [...] >> Having two identical fans, one blowing in and one blowing out, >> will not increase the air flow, except as noted above. >> >> Mike > > Everything you have said, Mike, is right, but in my experience it > doesn't translate well to a computer case. A computer case has a > lot of stuff between it and the fan, including wires and cards. > Many times, fans just end up creating a vortex of air through the fan > and the nearby vent holes, without necessarily crossing the hot > processor. By putting the fans in series, espically one in the front > and one in the back, actually creates a flow through the case and > across the heat sinks. It worked for me, and thats why I put it all > under "lessons learned". Actually, just air flow isn't the whole story, as you point out. You need air flowing over the parts to be cooled. In one situation, I solved an overheating problem with fans actually _inside_ the case. Didn't increase air flow into or out of the case at all, but did redirect the flow. > Here is a good site explaining a lot about fans: > http://www.comairrotron.com/engineering_notes_02.asp Excellent citation. Also, the curves illustrate perfectly the point about case pressure diffferential arising out of flow restrictions, though I trow they are schematic only, and not derived from any actual data. Mike -- p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);} Oppose globalization and One World Governments like the UN. This message made from 100% recycled bits. You have found the bank of Larn. I speak only for myself, and I am unanimous in that! _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
