"I want to place a fan underneath the clock to draw out this hot air, otherwise the life of the clock will not be as long as it will without the heat. "
Hot air 'rises' ie is pushed up by denser air. Pulling hot air down is not as effective as helping it go 'up'. AND, wherever you are moving air, you need an IN and an OUT. I was not sure about your description... if you do pull the air down as you say, can air get in to replace the air you are trying to move.... ie holes in the top? If there are holes for the air to get 'in', then you better compare pulling and pushing - use a thermometer. If there are no holes for the air to get 'in' then you had better reconsider. Blowing air / 'sucking air' around the case will help cool by conduction through the case - a litle. John K ----- Original Message ----- From: Dman777 To: neonixie-l@googlegroups.com Sent: Wednesday, October 08, 2014 11:48 AM Subject: [neonixie-l] Nixie Clock Cool Project- a few questions I have a 6 digit Nixie ZM5660 clock that I got from pvelectronics that is beautiful and super cool. Everything is perfect about it. However, since it is multiplexed there is one spot that has a very high concentration of heat. I want to place a fan underneath the clock to draw out this hot air, otherwise the life of the clock will not be as long as it will without the heat. I will be taking dremel and drilling a large area underneath the case and placing a fan against the case surface(outside of the case) to draw out the hot air. I will then wire the 12v fan to the power supply connectors. When done, I will be placing the clock case on two blocks so there will be about 3 inches of area between the bottom of the clock(with the fan) and the shelf it sits on. I addition, I will drill some small holes for cool air intake on the sides and on top. A few questions come to mind, please: 1) The case is only 3/4 of inch deep. Should I go for a 2 inch fan or 1 inch fan? Typically, a 2 inch fan will draw more heat out. But since there will only be able 3/8" of space between the fan and circuit board, I am not sure which would be more effective in drawing heat out. 2) The source of heat is in the center middle of the clock. If I place the middle of the fan directly underneath the heat concentration, will that heat just sit since it won't be above the blades but instead above the rotor? Should the fan be off center to the actual heat concentration? 3) I would like a fan with a good ratio of not to loud but move enough heat out. Not sure which would be a good cfm. 4) I don't understand why, the heat concentration is in the dead center of the clock, but the source of what I think is the source of the heat...the 7805 voltage regulator... is of to the side of the source of the heat concentration area. 5) Do I need to worry about trace erosion from air flow and friction? On my old Xbox I had the fan running high in it and one of the traces eroded. Here are some of the fans(Would like to stick with ball bearing) I have been looking at. I am big fan of Sunon: 1 inch: http://www.jameco.com/1/1/2967-kde1203pfb2-8-ms-dc-brushless-tubeaxial-fan-bearing-type-ball.html http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_1708465_-1 2 inch: http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?refineValue=Ball&refineType=1&langId=-1&position=1&productId=1950446&refine=1&catalogId=10001&history=6fqaemmj%7CsubCategoryName~DC%2BBrushless%2BFans%5Ecategory~3715%5EcategoryName~cat_37%5EprodPage~15%5Epage~SEARCH%252BNAV%401bnairch%7Ccategory~371530%5EcategoryName~cat_3715%5Eposition~1%5Erefine~1%5EsubCategoryName~DC%2BBrushless%2BFans%2B%252F%2B2.00%2522%2B%252850mm%2529%5EprodPage~15%5Epage~SEARCH%252BNAV%40dnogx9g3%7CrefineValue~SUNON%5ErefineType~1%5Eposition~1%5Esub_attr_name~Manufacturer%5Erefine~1%5EprodPage~15%5Epage~SEARCH%252BNAV&sub_attr_name=Bearing&storeId=10001&ddkey=http:StoreCatalogDrillDownView Thanks, -Darin -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/9afbd7cc-0b78-4cb5-94ae-1a0a3aa65854%40googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/47729F6C30BB45B28973E74A4C0FD865%40compunet4f9da9. For more options, visit https://groups.google.com/d/optout.
