Is the possible entry of water a problem? I've always though that the gap between the impeller and the frame should be on the bottom so that water could not fill the airspace in the fan motor. Having an ICE cranking in the rain due to a loose starter relay dangling from it's wires taught me to always mount things so that water aided by gravity could not get the insides wet. I imagine that it would not be a problem while the fan was turning...
On Mon, Jul 8, 2013 at 9:33 AM, Dach Savage <[email protected]> wrote: > In most any ventilation or cooling scheme it is best to use the fan in an > exhaust mode, IE pulling the air out of a cabinet. Bladed fans almost > always work better as "pullers". If you are trying to keep an enclosure > dust free then you can pressurize the enclosure like I did with my octayurt > at Burning Man, I had a computer mainframe fan >pulling< air thru a water > filter and then pressurizing the enclosure. Worked amazingly well. Dach. > > > > ________________________________ > From: Roland Wiench <[email protected]> > To: Electric Vehicle Discussion List <[email protected]> > Sent: Monday, July 8, 2013 8:05 AM > Subject: Re: [EVDL] Fans Up or Down? > > > In cooling any electrical enclosure, it is recommended to exhaust the air > from the top of the enclosure bringing in cooler air from the bottom of the > enclosure which should have a air filter on it. > > The enclosure should be seal and airtight so the exhaust fan does not > bring air other than through the input port. > > On a seal enclosure, you could put a fan on the intake side to pressurize > the unit and should use a air filter on the intake side. It is recommended > to exhaust to the outside of the vehicle and have a screen over the exhaust > port. > > I use a Dayton 6 inch blower motor on the motor controller and on the > motor to pressurized these units. I also use a standard 6 inch carburetor > filter which attaches to these fans. > > I use a 3 inch inline PVC acid proof fan on the exhaust side of my battery > box. The intake side is make up of 2 inch pvc high pressure plumbing fits > that bring in air below the vehicle which has that green 3M plastic filter > material that is place inside the pipe inlet. > > Roland > > > > > > > > > ----- Original Message ----- > From: Mike Nickerson<mailto:[email protected]> > To: Electric Vehicle Discussion List<mailto:[email protected]> > Sent: Sunday, July 07, 2013 11:43 PM > Subject: [EVDL] Fans Up or Down? > > > I just installed two fans on my Kelly KDHD controller. After installing > them, I realized I had installed them so they were blowing up ( drawing > warm > air from the top of the controller and pushing it towards the hood). > After > noticing that, I realized that I could have reversed the fans to draw air > from the hood and push it down across the controller. The fans are > mounted > directly to the top of the controller that has small (1/8") ridges. > > I'm kind of inclined to leave the fans this way for two reasons. First, > this is the direction of natural convection. Second, the hood is very > close > to the fans and it could be hot. I'm not sure it would be good to pull > hot > air heated by the hood over the controller. > > The controller is also mounted to a 1/4" piece of aluminum plate about 6" > wide and 13" long. There is also some heatsinking on the back side of > the > aluminum plate (about 5" by 6" and 1 1/2" fins). There isn't a lot of > airflow under the hood, but there is some. I've been running the > controller > without fans, so I assume this is an improvement, no matter which > direction > they blow. > > Most of the commute is at highway speeds, so that should help air flow. > The > fans are 12V, 120mm computer fans meant for a CPU case. > > Any opinions whether the cooling would be more effective with the flow > reversed? > > Mike > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub< > http://www.evdl.org/help/index.html#usub> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org< > http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130708/27f5ff47/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130708/03044730/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130708/e7123737/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
