Manfred has the right idea.
For this application, you want something that is 'set and forget'. If I
were looking at a coolant today, I would look at the perflourocarbons.
We used this to cool magnets in tokamaks with good success. The 3M
Flourinert is pricey, but I found it available on the web recycled as
well as a range of clones at much more reasonable prices. Different
boiling points are available so evaporative options are open.
Bottom line: What is your time/equipment worth? Do the math.
YMMV
Dave
K7DLS
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