[time-nuts] Temp/Humidity control systems
scott.j.stobbe at gmail.com
Thu Oct 27 12:50:35 EDT 2016
I'm not sure I follow the insulation is bad argument, thermal time constant
= RC, better insulation, longer time constant.
On Thu, Oct 27, 2016 at 12:37 PM, Mike Naruta AA8K <aa8k at comcast.net> wrote:
> On 10/27/2016 03:41 AM, Poul-Henning Kamp wrote:
>> Over insulating is a 100% sure-fire way to get unstable temperature
>> 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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