[Andrew Blair]

Originally Posted by lukevanoort

Unfortunately, that'll only get it down to ambient temperature unless you use an active cooling method. For that, you need some sort of refrigeration, most units are much too heavy/power hungry, the only thing that I can think of that could do it is a Peltier junction. These are nifty little ceramic (I think) blocks that get hot on one side, cold on the other when you run current through them. Then you have to worry about condensation. Peltiers could instead be used with fans to help reduce the temperature below ambient. I don't know where you could get one though, but they used to be popular with the extreme case-mod/water-cooling crowd so there probably is a place to acquire them. Most will probably be in the 12VDC area, but power consumption is pretty low, (if I remember correctly) 10 NiCd AAAs could probably power it and the robot, NiMHs would be even better. (less toxic) The Robot Marketplace has customizable battery packs you could use.

Ooohh...Peltier's...those are cool. I might just suggest this little baby- http://www.electronickits.com/kit/co...tier/ck500.htm

You seem very intent on cooling the air, not just introducing it, so this in a sealed metal box would work quite nicely. Otherwise, just use a plain fan and some bullet holes as Bilbo said.

But I have a question: What kind of kid goes outside in 100 degree temperatures to play with a robot instead of slugging around inside watching TV? Sounds more like some crazed ME to me... ;-)