Closed loop cooling

[Jeff Wohlt]

CPU cooling fluid may be a good coolant. Wetter than water...however that works...LOL... but I do know they put stuff in HP car radiators and it works and drops temps.

[Jeff Wohlt]

CPU cooling fluid may be a good coolant. Wetter than water...however that works...LOL... but I do know they put stuff in HP car radiators and it works and drops temps.

http://www.frozencpu.com/products/15033/ex-liq-203/Ice_Dragon_Cooling_Nanofluid_Coolant_-_32oz.html

[Grazacind]

[QUOTE=drwayne;416904]Except for those 2 times when the castles self cremated, I dont overheated packs.

Packs work best when warmed through to a "hot blonde's body" temp of 37->40'c.
I see HC have LiPo cooling plates.. these introduce a temperature dynamic across the polymer which I assure you is bad for business.
Id prefer to use those as heat dissipators in a cooling loop system !

Cooling the cables only I was suggesting. Once your wires get hot they become innefficient.

[Old Sloppy]

My ESCs have no moving parts, so what's to break?
Opinions please! JIM

Jay is correct ! You should listen to his words. thermal over-contraction will cause cracks. ( AKA breakage)

Harry

[drwayne]

Tony
shorter runtime POV is fine !
Longer Vs shorter outnumber us 100:1
My state is an rc boat hydrocarbon jungle. Introduction Proboat and Chinese cheap electrics have changed the local pond demographics, but the short runtime self build POV people are ( not so silently) growing in numbers. !

I equate heat buildup as a dynamic between cheap inefficient equipment, and over driving an underpowered setup.
The balance of budget Vs bravado oft ignores longevity.
wiki:pontification ! haha

Ive video of my 36" cat 6S1P to twin 1512 @85+mph.. and at WOT the water exhaust raises some 3" from small outlets..
Logged 128A a side peaks, avg 80ish in oval trim.
The water flow was 'low' yet the elecs returned within temp for what is clearly a hard run ( day temp 30'c )
http://www.youtube.com/watch?v=WLxCebi3i5w turn up the sound ! ( hehehehe )

Varister temp probes are great. A simple loop that increases R as temp rises.
Use as reference for voltage IC and easy water flow controller.. hotter = moreV = more flow.

Adieu.

[Prop-a-Gator]

Intense vid, Dr. Wayne! What type of water pickups? Very interesting view of the water outlets. You can clearly see one side starve in the turns. Significant? Maybe not, but cool to see in action.

[drwayne]

Intense vid, Dr. Wayne! What type of water pickups? Very interesting view of the water outlets. You can clearly see one side starve in the turns. Significant? Maybe not, but cool to see in action.

Outside motor returns a tad warmer ( because it had farther to go? haha ).
Single OSE underhull pickup per side .. to SF120 to HRC jacketed 1512 to outlet .

Im a fan of underhull pickups.
As we race clockwise , why have rudder pickups on outside face which is in vacuum phase during high speed turns ?
The sprintcat36" I ran with rudder has vid of flow loss in corners... later as underhull, no loss. !

[drwayne]

Back to the closed loop systems, with thermostat controlled coolant flow ....
What is considered 'optimal' temp range for esc & motors ?
A few ppl here state that overcooling is bad.. and I agree.. what would be most efficient temp range?
From a motor's sealed oil bearing viewpoint 100'F (35'c) would be nice...
Id aim for an average run temp overall, and a thermostat could alleviate those damaging heat spikes...

Thoughts ?
Thx
W

[T.S.Davis]

I've been threatening to build one of these into my cooling system for years.

https://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=200&products_id=2584&zenid=23375f330a9eb2bcce7436463085efaa

I wasn't thinking closed loop at the time though. One of these radiators with some creative air passages through the canopy could be um.......cool. haha If you look into PC cooling you'll find they've been doing closed loop for years.

For T offshore I once built a canister that had an aluminum coil tube inside it. The canister I filled with ice water. Water came in from the lake and was cooled further by passing through the coil/icewater contraption. It seemed like a good idea but was so poorly executed that I couldn't keep the water in the canister. Ended up with a mess o' water in the boat. I should try that again now that I'm smarter.

What about an actual refrigerant type system?

None of these are very practical. Fun mental exercise though.

[drwayne]

Hi
Used a watercooled dual cpu when editing Australian Nationals DVD 2006 ( see chapters on youtube drwayne1966)
Problem being they are also closed loop and an upper limit after which it would blow a hose !!!!!!!!!
But this needed a fan and a pump... and a header tank and radiator and and... and a dual fan heatsink accomplished a better result..
I think a large header tank with pump per motor is most adequate. The runtime here is not in the day long realm of Pc gamers ( I wish ! ) so over heating the coffee pot wont be a problem.
Nice radiators all the same !...

W

[Old Sloppy]

What is considered 'optimal' temp range for esc & motors ?
A few ppl here state that overcooling is bad.. and I agree.. what would be most efficient temp range?
Thx
W

optimal temp for ESC & Motor is 33 degrees F.
optimal temp for Lopo's is 122 degrees F.

Harry

[ozzie-crawl]

optimal temp for ESC & Motor is 33 degrees F.
optimal temp for Lopo's is 122 degrees F.

Harry

Not sure if the 33f is a typo or not.
I have played with a fair few rc car brushless motors and when some were given enough gearing and dynamic timing they become completely different animals but run in the 85-90 deg Celsius area. They would do this run after run with no apparent drop in performance. Its the gearing/timing making the big performance difference but if the motor is happy to run at those temps while others need to be well below that makes me think optimal temps would change from motor to motor.
but i am no electrical engineer so i could be completely wrong

[drwayne]

optimal temp for ESC & Motor is 33 degrees F.
optimal temp for Lopo's is 122 degrees F.

Harry

Yes, that's what Ive heard.
Thx
W

[ozzie-crawl]

I will see if i can get you a litre of my EX wifes blood. It passes threw a heart of ice and i am sure it would stay cold for the next few hundred years

[tlandauer]

You are a genius! Why didn't i think of it? NASA , are you listening? I am sure enough of us will be glad to look into this alternative yet enviornmentally "green" method. Nothing is wasted!