Hi
Just for reference:
It takes about 700 pounds of steel shot to fill up the region between
a 30 gallon steel drum and a 55 gallon steel drum. You can get roughly
2" of foam in between the outside of the 55 gallon steel drum and a
110 gallon drum. A 2x4 wall around the 110 gallon drum can be useful
for taking care of drafts.
Steel may not be perfect, but in shot form - it's cheap.
Bob
On Jun 10, 2009, at 8:19 PM, J. Forster wrote:
Take a look here:
http://en.wikipedia.org/wiki/Thermal_diffusivity
-John
===========
The thermal conductivity of cast iron is relatively poor for a metal.
Water has even lower thermal conductivity however this can be
overcome
by stirring.
Bruce
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