Thinking about water cooling...

[electric]

Here is the pump I ordered yesterday:

http://www.lightobject.com/3LMin-mini-DC-Water-Pump-Good-for-CPU-HHO-P122.aspx

[electric]

Wow. Out of curiousity I did a rough order calculation and .216 lb (6 cu/in) of ice has the ability to remove approx 211 watts over a 3 minute run time. Thats more then I would have guessed.

Of course the systems you guys have designed and run cannot carry 6 cubic inches of ice. I just used that number as it was much easier to use a known volume. The real numbers would probably be less then half as no gradient or material coefficients were included and those all would reduce the cooling capacity.

John

http://www.mhi-inc.com/Converter/watt_calculator.htm

I am not an engineer, just a software guy, so not sure if this is good news or bad news?? Chuckle.

[m4a1usr]

I am not an engineer, just a software guy, so not sure if this is good news or bad news?? Chuckle.

Its not bad news. But it does make me want to do some heat load calculations on some preconceived notions I had been taking for granted. The real problem is defineing the losses. The more items, the less eff the cooling becomes.

John

[questtek]

Wow. Out of curiousity I did a rough order calculation and .216 lb (6 cu/in) of ice has the ability to remove approx 211 watts over a 3 minute run time. Thats more then I would have guessed.

Of course the systems you guys have designed and run cannot carry 6 cubic inches of ice. I just used that number as it was much easier to use a known volume. The real numbers would probably be less then half as no gradient or material coefficients were included and those all would reduce the cooling capacity.

John


http://www.mhi-inc.com/Converter/watt_calculator.htm

Good job, John......Now you can see why it has to be ice and water and not just water. Remember, these are small containers, 3x2x1 inch so using a large container would go a long way in removing more heat since it is directly proportional.

Water weighs 0.036127 lbs per cubic inch or 16.387064 grams per cubic inch. Thus filled with water this adds 6 x 0.036127 = 0.217 lbs or 3.4 ounces. Uniquely the weight of the water is almost exactly that of the pump, connectors, tubing, container and micro temperature sensor!

The upshot is you are adding almost 7 oz to the weight of your FE boat. And to think, (strength and looks issues aside), you bought the carbon fiber/epoxy hull version for $125 more than the fiberglass polyester resin model because it was 2 ounces lighter!

[questtek]

Here is the pump I ordered yesterday:
http://www.lightobject.com/3LMin-min...-HHO-P122.aspx

Jeff asked where I obtained all my mini pumps............surplus years ago, probably for a few bucks a piece. None of my contacts have access to that type of item now and I used all I had as the pump for the "Blood" injection system for my RC great white shark fins. The pump you found in indeed the only one I was able to find also. I think it is worth a try.

[Jeff Wohlt]

I think I will get a few of those as well. Try some options.

This is more than enough to keep water flowing and cooling parts...we all want the esc to be coolest first. The nice thing is it is easy to keep the water very cold for the 4-5 minutes we are out there. easy to bring the temps of water down.

it is a win/win no matter how you do the math.