[NSRCA-discussion] Heat Sinks

[glmiller3 at suddenlink.net]

What the heck are Peltiers?  Flying in LA I never have to worry about batteries being too COOL!

I'm always looking for a way to improve heat exchange, though. 

G
---- John Pavlick <jpavlick at idseng.com> wrote: 

=============
You didn't fly fast enough to heat them up! <LOL> Seriously, LiPOs perform best within a certain temperature range. You electron heads should look into something that can keep the batteries within this range. Maybe Peltiers? These are nice because thay can generate heat OR provide a cooling effect. If anyone wants to explore this I'd be glad to help.
   
  John Pavlick

JEREMY CHINN <lagrue at hotmail.com> wrote:
      .hmmessage P  {  margin:0px;  padding:0px  }  body.hmmessage  {  FONT-SIZE: 10pt;  FONT-FAMILY:Tahoma  }    The assessment on my Kudzu at the Nats was that my batteries never even got to optimum operating temperature...... 

  
---------------------------------
  From: jpavlick at idseng.com
To: nsrca-discussion at lists.nsrca.org
Date: Thu, 31 Jul 2008 22:12:06 -0400
Subject: Re: [NSRCA-discussion] Heat Sinks

          Sounds heavy. Don't electric airplanes have trouble making weight (except for Dave Lockhart's of course)? What are you guys doing for letting air in / out of the fuse. Without proper airflow, even a good heat sink won't work. Actually wouldn't it be better to make some kind of (light weight) thermostatically controlled cooling system? Cold LiPOs don't make optimum power.
   
  John Pavlick
http://www.idseng.com
    ----- Original Message ----- 
  From: Earl Haury 
  To: Discussion List, NSRCA 
  Sent: Thursday, July 31, 2008 9:49 PM
  Subject: [NSRCA-discussion] Heat Sinks
  

  We all tend to mount E batteries on some sort of wooden / carbon / nomex shelf and tie them down with Velcro or a clamp plate - none of which are very good at transferring heat. Possibly we could improve heat transfer from the batts to the cooling air by using aluminum, or better yet - finned aluminum heatsink material for the shelf / clamp. 
   
  I've spent a fair bit of time trying for find appropriate heatsink material online - something 4" long x 3" wide with a high count of thin,  maybe 1/4 high, fins might work. Unfortunately, there's tons of heatsink material available from Newark, Mauser, etc. but it's difficult to find the right stuff - especially material light enough for our use. The closest I've come is Thermaflo # E1243, but I'm lacking a small quantity source. 
   
  Anybody work with this stuff & have recommendations or sources?
   
  Earl
  
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