On 10/27/2016 03:41 AM, Poul-Henning Kamp wrote:
Over insulating is a 100% sure-fire way to get unstable temperature inside,
because it amplifies the consequences of any change in power dissipation.
It is a classic mistake to build a 100mm insulated enclosure inside an
office-like environment and end up having less stable temperature on
the inside than the outside.
Cinder blocks is a much better material for that scenario, because they
have both thermal mass and inertia (= heat capacity and heat impedance)
True Poul-Henning Kamp.
My application was to ecologically stabilize a room exposed to
outside weather. I am pleased to see the heater rarely come on,
even on cold Winter days. I attribute that to the insulation
and equipment mass (half-century old computer, avionics, and
amateur radio equipment). Even in the Summer heat, the room
stays cooler than air temperature (barn roof and day/night
averaging?).
John's Georgia basement may also enjoy natural cooling and
thermal inertia. Cinder blocks may be optimal. We really need
to know John's goal and existing conditions.
Mike - AA8K
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