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Jerry Cochran
Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR
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 Posted: Wed May 17, 2006 5:10 pm Post subject: Avionics Cooling |
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Folks,
I did the test suggested by Brian Lloyd below, and was pleasantly surprised.
My stack is an EIS4000, 2 Comms, 1 Xponder, 1 Audio Panel. Started at 83.0f
after 15 mins 87.0, so guess I won't have to mess with no stinkin'
fan....???? BTW, checked over, under, around... Thanks, Brian.
Also, Fry's has a nice little 12v fan with real bearings for $11.00, 29CFM
Draws .13a, 26db. 30,000 hours... *they say*
Jerry Cochran
Wilsonville, OR
Whether or not you need a cooling fan depends on how you have the radios
stacked in there. A single radio has all its surface area available to get
rid of heat by convection and probably doesn't need extra airflow. I have
my Terra radios stacked vertically, single wide, and the temperature rise
is minimal because they still have plenty of surface area so I don't need a
fan. When you really pack the radios in there the ratio of surface area to
volume/heat goes down so you need to make what area you do have shed heat
more rapidly. A fan is an asset there.
You know, the military uses conduction cooling of equipment. You can do
the same thing by placing a finned heat sink on the sides of your radio
stack with the fins oriented vertically. Natural convection will carry
away a lot of heat without the need for a fan.
So, in answer to the question, "do I need a fan for my radio stack." the
answer is an unqualifed, "maybe and maybe not." What matters is
temperature rise. Turn on the master (use a battery charger or, better
yet, a regulated power supply to keep from running the battery down), turn
all the radios on, and then measure the temperature of your radio stack
after about 15 minutes of operation. If the temperature rise is 5-10
degrees C, don't worry about it. If it is 30 degrees C, you definitely
need to help the radios shed heat.
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brian
Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA
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| Posted: Thu May 18, 2006 6:12 am Post subject: Avionics Cooling |
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On May 17, 2006, at 6:00 PM, Jerry2DT(at)aol.com wrote:
| Quote: |
Folks,
I did the test suggested by Brian Lloyd below, and was pleasantly
surprised.
My stack is an EIS4000, 2 Comms, 1 Xponder, 1 Audio Panel.
Started at 83.0f
after 15 mins 87.0, so guess I won't have to mess with no stinkin'
fan....???? BTW, checked over, under, around... Thanks, Brian.
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You are welcome. How long ago did I write that? It has been awhile.
Brian Lloyd 361 Catterline Way
brian-yak AT lloyd DOT com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
Antoine de Saint-Exupry
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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)
I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery |
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