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://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
