On 2/23/15 9:35 PM, Brian Inglis wrote:
On 2015-02-22 17:42, Charles Steinmetz wrote:
Brian wrote:
Thought of trying aerogel insulation?
Dust free varieties avoid handling issues.
Be careful not to over-insulate the oven -- it depends on a certain
amount of heat flow to ambient to balance the heater. The stability
of the heater control loop depends on having the correct amount of
thermal resistance from oven to ambient (also, on the thermal
resistance being distributed similarly to the original scheme).
R-value for commercial aerogel insulation is about double rigid
polyurethane insulation, so half the thickness would be about right.
What about fiberglass or rockwool
extruded foam polystyrene is about R-5 per inch
Fiberglass is about R-3.2/inch, mineral wool is a bit better at R-4 to
R-4.3/inch
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