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-   -   Dry Ice as Motor Coolant (http://www.chiefdelphi.com/forums/showthread.php?t=134484)

Ether 13-02-2015 17:30

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by techhelpbb (Post 1443545)
Probably can't stop you from using fully melted dry ice in no container :D

Physics will stop you from storing "fully melted" (liquid) CO2 in no container.



techhelpbb 13-02-2015 22:44

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by Ether (Post 1443555)
Physics will stop you from storing "fully melted" (liquid) CO2 in no container.



Technicality ;)

GeeTwo 13-02-2015 23:59

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by G25
ROBOTS may not intentionally detach or leave parts on the FIELD.

As I recall, the field is a volume, not a surface, so venting carbon dioxide to the atmosphere would violate G25 as well.

seg9585 14-02-2015 01:14

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by GeeTwo (Post 1443730)
As I recall, the field is a volume, not a surface, so venting carbon dioxide to the atmosphere would violate G25 as well.

Hah. In that case, wouldn't an infinitesimal amount of pneumatics accumulator leakage also break the same rule? We will need to reference the Maxwell-Boltzmann distribution equations to know how quickly G25 becomes violated.

BBray_T1296 14-02-2015 01:56

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by alicen (Post 1443516)
It's dangerous, technically a hazardous material, and has potential for leakage or spilling, thus causing damage to the field or other robots.

I understand the whole argument that dry ice could be considered a hazard to humans, but out of curiosity I am interested in how you think any amount of dry ice (let's be reasonable) could cause damage to the field or other robots.

I feel like dumping air from the pneumatic system is more dangerous to a robot simply from the moisture condensate in the tanks


By the way, at any standard temperature for a robotics venue, dry ice does not melt, but sublimes

Kevin Sevcik 14-02-2015 09:11

Re: Dry Ice as Motor Coolant
 
Poorly secured dry ice on a robot would be a hazard if the robot tipped. Plus you're going to confuse field staff with your "smoking" motor. Plus thermal stresses like that aren't good for a motor. Plus condensation. I'll pile on with everyone else and ask what you're doing to this motor that's making it so hot.

Ether 14-02-2015 09:56

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by BBray_T1296 (Post 1443775)
at any standard temperature for a robotics venue, dry ice does not melt, but sublimes

CO2 cannot exist as a liquid below 75 psi pressure, regardless of temperature.

Also, CO2 cannot exist as a true liquid above approx 31 degrees C, regardless of pressure.



josephus 15-02-2015 13:36

Re: Dry Ice as Motor Coolant
 
Additionally, if you start a match with five grams of a substance and you end the match with five grams less than you started with, are you leaving materials on the field?

Ether 15-02-2015 13:50

Re: Dry Ice as Motor Coolant
 
Quote:

Originally Posted by josephus (Post 1444509)
are you leaving materials on the field?

...because CO2 is heavier than air?



matthewdenny 15-02-2015 14:06

I would think the "leaving it on the field" argument people are making here would apply to pre pressurized pneumatics as well? Technically your robot would have less mass if the pneumatics was lower pressure at the end.

who716 15-02-2015 16:07

Re: Dry Ice as Motor Coolant
 
we have specially made aluminum that we place on the motors in between matches and the heat from the motors transfers right over to heat the aluminum


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