composition for low temperature heat transfer fluid

Geeeh! I dont sure but I know there are some kind of ultra low temp. Glycol for such applications. Probably will be good to check with your local supply vendor representative for these ancillary and they will hook you up with the wrigth solution eventually.

Keep it Cool,

MC

Hi Szafar,

Few days ago I also search the answer of this question, There is a very useful temperature chart on Dynalene.com which will answer your question most likely.

Nancy

Gosh! Yeap! Good deal Nancy good move about this temp. chart data, I agree. Important reference to follow up for these request, definetly.

Chart Time,

MC

If your primary concern is heat transfer, then use a substance and pressure that have the fluid boiling at the warm end and condensing at the cool end. You then have half the material moving as a vapor, which is really low viscosity. You also have the heat of vaporization carried by the vapor molecules, which is much more efficient than simply depending on the heating and cooling of a liquid.

This is the method used to cool many, if not most, CPUs in current computers. They, of course use significantly higher temperatures, so can use fluids with higher boiling points at ordinary pressures.

Propane has an atmospheric boiling point of -45°C, so only a slight adjustment in pressure would make it boil at -40°. Note that the hollow containing the refrigerant would be evacuated before introducing the propane, so there would be essentially no oxygen, and therefore no danger of fire, except in the case of rupture.

One of the low temperature fluids from the Paratherm corporation might be of use.

http://www.paratherm.com/