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**Golddiggie** · 12-01-2012, 12:30 AM

Quote:

Originally Posted by xkred27

I use the fridge. I tape the probe from the temperature controller onto the bucket. In a sense, I guess I'm letting the yeast operate the fridge for a while. It would be more accurate to have the probe in the middle of the wort, but then I would have to wrap my probe.

And no one wants that.

I sheath mine in stainless steel.

Wynne-R · 12-01-2012, 01:23 AM

Quote:

1 W/(m.K) = 1 W/(m.oC) = 0.85984 kcal/(hr.m.oC) = 0.5779 Btu/(ft.hr.oF)

Alcohol 0.17

Air, atmosphere (gas) 0.024

Glass 1.05
Pyrex glass 1.005

Ice (0oC, 32oF) 2.18
Snow (temp < 0oC) 0.05 - 0.25
Water 0.58

Aluminum 205
Copper 401
Iron, cast 55
Stainless Steel 16

Just for fun, let me throw some numbers for thermal conductivity into the mix.

I don’t know about air, but for water the inside vs outside temp is a few tenths of a degree F. That’s for a water bath with frozen bottles cooling a glass fermentor.

If you figure the difference in conductivity is x24, then 8-10 F corresponds to .33 -.40 in water, compared to air.