I've been using the beer cooler hack instead of a sous vide machine and I was wondering if water is the only medium I can use to cook in it. I was thinking that I could fill it with oil for a high thermal mass that would use less energy since I'm using a plastic bag to prevent any contact with the food anyway. Also, how important is that plastic bag? Could I use a broth to sous vide in with something pourous holding my meat and seasoning together?
Do you have to use water to sous vide
sous-vide
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Best Answer
You could use oil, but I don't think it's worth it; realize that you're going to be using additional energy for obtaining, cleaning, and disposal of it.
Regarding using a broth with a porous bag, well, that isn't sous vide. That's more akin to a slow-cooker. The whole point of sous vide is the airtight barrier between food and heat.
Update
Oil does not have a higher thermal mass than water. Ammonia does, but I'd suggest avoiding that. ;)
Source: http://www.engineeringtoolbox.com/specific-heat-fluids-d_151.html