Liquids that have Good Endothermic Properties and do NOT Conduct Electricity

Endothermic usually refers to a chemical reaction or process and not the chemical itself.

bugger oh yeah, sorry. good thermal conductivity for cooling then.

Distilled water?

Mineral oils are used as heat transfer fluids and are non-conductive.

What is the temperature range you will be using said fluid?

The fluid would only have to withstand temperatures between -20°C to 120°C. the fluid would have to be efficient at heat transfer from a surface (possibly brass) to a vent system. Hope this helps. :-)

look at transformer oils. These are meant for what you have asked here.

very good answer sir..

Can you please describe your application in as much detail as possible as there are still to many unknowns (such as a vent system which indicates a possible open loop system, in which case perhaps distilled water with antifreeze additive to handle -20 to 120 deg C process temperature range). Also how much of it do you need? Is the liquid circulated with a pump? Why does the liquid need to be non-conductive (most liquid cooled applications do not have the liquid in contact with electricity unless it is for winding or busbar cooling, etc)?

The more information you give the easier it is to answer without guessing. Can you please describe your application in detail.

The system is a closed circuit under a slight pressure but this is only maintained by rubber seals it also comes very close to (UK) 240V mains electric and due to the UK Health and Safety board it is an added requirement.

The Fluid would be circulated with a pump and can not be to viscous due to the small nature of said pump. I like the idea of distilled water with anti freeze but i have read somewhere that it will still conduct electric (only a small amount). I hope this helps as it is very difficult to describe exactly why i need this information. (i can however strongly stipulate it is NOT illegal in anyway shape or form.)

When my watercooled computer sprung a leak (water+antifreeze) it did screw up the motherboard due to the conductivity of the antifreeze. Cleaned it with distilled water and all was fine.

Mineral oil at -20C is probably going to be too viscous to pump and Fluorinert is toxic.

if my system sprung a leak it would screw the person sat in front of it like a live electric heater thrown into a bath. he he he. soon kinda need the non conductivity as a must have. I would not want to fry my customers now :-) (ok some maybe, but only because their more hassle than they are worth)

Pumps can be changed so don't limit your options just because a liquid may have an elevated viscosity. A gear pump works very well with viscous liquids.

I think what you are looking for is silicone oil. There are too many formulations to list here. But, an internet search should give you a product that matches your specific need. It does meet the spec's you mentioned in your OP. Hope this helps.

Thank you so much for your help. I am going to look into both silicone oil and mineral oil and i will get back to you all with my results.

You might like to look at Galden PFPE, its a sort of liquid teflon.

We used it as a medium in our "Chip fryer" (vapour phase oven).

http://www.solvaysolexis.com/products/bybrand/brand/0,,16049-2-0,00.htm

Its capable of transferring heat well, is chemically inert, and has high dielectric properties.

Years ago I built a dummy load to use at 7 Mhz 600V 100 W final amplifier and used corn oil, yes regular cooking oil, as the cooling liquid. Worked great. Just use an Ohmmeter to be sure you get a non conductive brand. I used Crisco.

The Galden fluorinated liquids should do your job. 3M also makes a series of fluids called Fluorinert that will do what you want. See http://en.wikipedia.org/wiki/Fluorinert Transformer oils are flammable (unless you add cancer causing chemicals).

Use any cooking oil like corn and mustord oil or silicon oil. They will extract heat and are cheap also

Check out these guys, I'm fairly sure they have something that will work for you.

http://www.paratherm.com/

Many thanks to all of you for your suggestions. I am going to look into all of them and will update you once the most efficient one is located and tested.

Tim

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