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Oil Bath Cooling for Overclocking LED's

post #1 of 9
Thread Starter 
I want to use a water-cooling setup to pump mineral oil directly onto high-powered LED's (Luminus CBT-120s). I want to see how much more power I can get out of them with direct cooling, and I also want to run some tests at high temperatures to characterize changes in wavelength, etc.

Anybody know how hot you can run PC watercooling loops? Is there a different type of pump I should be using? Can I even run mineral oil through a pump made for computers?

Thanks!
post #2 of 9
max fluid temp of the mcp655 (the water cooling pump i use) is 60C. It is commonly used for oil set ups but will draw a lot of power so beware of that.

The max fluid temp is how hot it can run, if everything is attached well then the plastic, reservoir, etc. will all be fine. Just make sure if you are planning on running near that temperature that everything is attached very well, or else the temperature will loosen the tubing off the barbs potentially.

Edit #2: Depending on how large your loop is, how much restrictions in the water block, etc, you may want to go with 2 pumps, for added pressure and to split the work.
Edited by postama - 7/19/11 at 9:08am
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post #3 of 9
Thread Starter 
Thanks, it looks like I'll have to look to another market for pumps that go higher... I want to hold the LED's near their maximum operating temperature regardless of how little power I run through them, maybe even above 100*C.

I know that the water block, the tubing, etc. can take 150*C, but I wasn't sure if the plastics used in the pumps would be similarly rated.
post #4 of 9
If your going that hot you sould look into an electric oil pump for a car engine. They are of corse 12v so you should be able to splice it into a power supply. It will likely cost about the same as a 12v water pump as well.
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post #5 of 9
If you go with two DDC-1 pumps in series and use a cooling mixture of 50/50 PG glycol, then the LEDs can go to 100C. The only concern then is keeping the pump cool at that extreme. Koolance has pump heatsinks for the DDC series. Allowing air to coll over the pump heatsink really helps out.
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post #6 of 9
Quote:
Originally Posted by bmaverick View Post
If you go with two DDC-1 pumps in series and use a cooling mixture of 50/50 PG glycol, then the LEDs can go to 100C. The only concern then is keeping the pump cool at that extreme. Koolance has pump heatsinks for the DDC series. Allowing air to coll over the pump heatsink really helps out.
That is far, far over the maximum recommended fluid temp for the pumps; I would not recommend this. Pumps get most of their cooling from the fluid flowing through them, and air cooling the pumps would not cool the internals nearly as fast as they will burn out from having hot fluid run through it...plus the added temp from the pump working so hard
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post #7 of 9
Are you going to submerge them? Won't that affect the wavelength and create some loss transisting between the two mediums?
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post #8 of 9
Quote:
Originally Posted by DuckieHo View Post
Are you going to submerge them? Won't that affect the wavelength and create some loss transisting between the two mediums?
Thinking the exact same thing!?
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post #9 of 9
Thread Starter 
I looked on Danger Den and they do rate the DDC series at 60*C fluid temp, so that doesn't look like an option. Also, I have to go non-conductive with my coolant because I am submerging the LED's. The flow goes right onto the emitter, without any lens or cover, so PG and water is out.

The wavelength changes with the electric current and the device temperature. Anything you put between the emitter and the detector is going to absorb some of the light, but the media and transitions won't change the wavelength (except with special optics and lasers).

Thanks for all the suggestions!
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