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 < [email protected]> 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 > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > -- If you gaze long into an abyss, your coffee will get cold. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
