[time-nuts] Temp/Humidity control systems?

William H. Fite omniryx at gmail.com
Wed Oct 26 14:45:28 EDT 2016

Rick, professional environmental chambers and their contents have a great
deal of thermal inertia. In addition, they have overbuilt refrigeration
systems, electric heaters, and de/humidifiers. You teach your lab rats to
enter the chambers as infrequently as possible, to close the doors as
quickly as possible, to assure that materials brought into the chamber are
as near as is practical to chamber temperature, avoid bringing open liquids
in, etc. A good chamber will easily hold +/- 1C and +/- 2% RH in free air,
even with powered equipment inside cycling on and off and occasional
entries. An air lock wouldn't help as much as you might think because the
human body is a much larger heat reservoir than the air that might be
exchanged while the door is open. Keep in mind, too, that most
chambers--certainly the ones that would interest John--are intended to
maintain stability fairly near external ambient conditions. High and low
temperature chambers are a whole different species of animal.

On Wednesday, October 26, 2016, Richard (Rick) Karlquist <
richard at karlquist.com> wrote:

> On 10/26/2016 8:59 AM, John Ackermann N8UR wrote:
>> I may have the opportunity to build a small "clock room" and am
>> considering whether I could make it an environmentally controlled space.
>>  I'd like to learn about the options for doing this.
>> The space would probably be 6x8 feet or so, in a basement with one
>> outside wall.
> I'm lost with the basic concept here.  Help me understand this.
> If you go in and out of this room through a door, I don't
> know how you prevent large fluctuations in temp/humidity.
> You would probably need an air lock.
> Is it a "room" where humans go, or just a "chamber" that is
> locked up most of the time?
> Rick N6RK
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