[time-nuts] OXCO insulation

[Jim Lux]

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