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05-04-2007, 03:39 PM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,758
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Hypothetical Question
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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05-04-2007, 03:40 PM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,758
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Even better, as an extra point question... what use is this information?
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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05-04-2007, 04:43 PM
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Senior Member
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Join Date: Oct 2006
Location: Ukraine
Posts: 1,188
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I believe it is possible.
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05-04-2007, 07:13 PM
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Senior Member
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Join Date: Apr 2006
Zone: 5a
Location: Quebec, Canada
Age: 43
Posts: 2,720
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Gee Ross I don't know for sure. If you have anything exploding let us know 
Lesson the risk and get a hamster with a wheel for good air circulation 
Yes I know, I'm helpful ...
Your welcome!
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Gloria
"If you don't ask, you'll never learn"
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05-04-2007, 07:15 PM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,758
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OK, I have to clarify things here. This is a hypothetical question based on reality. So, again - if one were to be able to achieve 90%+ humidity in a closed tank, would running fans 24/7 change the humidity/dryness?
__________________
Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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05-05-2007, 04:37 AM
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Senior Member
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Join Date: Oct 2006
Location: Ukraine
Posts: 1,188
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 Just tell us the answer, please! |
05-05-2007, 05:52 AM
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Senior Member
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Join Date: Feb 2007
Zone: 6a
Posts: 168
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Yes
Yes, it is possible to get 100% humidity in a closed system. Fans running will not change the outcome, but will likely result in achieving the higher RH more quickly by providing more air/water interface opportunity. In mass transfer operations it is always preferrable to increase contact between the phases.
Two disclaimers...if system is not closed then very high humidity is unlikely unless one has the water supply and fan capacity to saturate the entire earth's atmosphere. Secondly, the pressure wave ahead of the fan blades will condense moisture on the blades before 100% RH is attained in the system. Therefore, if the fan is large and powerful it might limit humidity in the entire system to slightly less than 100%.
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05-05-2007, 09:29 AM
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Senior Member
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Join Date: Jun 2006
Location: San Antonio, TX
Posts: 450
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I agree...the difficulty lies in getting a truly closed system. unless that tank is truly air tight, which I doubt, you're never going to get to 100%. but you can certainly get close!
also, I would think you wouldn't want a truly closed system, because you do want to have some gas exchange. unless, that is, you are going to be piping in fresh gas from a tank, but I don't know if that's a desirable option.
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05-05-2007, 10:09 AM
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Moderator
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Join Date: Jun 2006
Zone: 9b
Location: Central Florida
Posts: 2,947
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__________________
Cheryl
“Although the tongue weighs very little, few people are able to hold it.”
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05-05-2007, 10:57 AM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,758
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OK, here's the answer
Yes!
I have happily been keeping the new tank at nearly 99% Here's the specs:
Tank not quite closed tight (approx 7 square inches openings in two 1/2" slots)
No active air exchange with outside - only passive from opening doors a couple times a week to fertilize and through the slots.
Active misting runs for 5 seconds every 4 hours. 3" 12 volt fan blows directly on orchids and front wall 24/7.
Top of tank averages 71-72 degrees F and 90-94% humidity (depends on how much time has passed since misters went off)
Bottom of tank, out of direct air movement stays approx 3 degrees F cooler (further from lights) and a constant 99% humidity.
Bottom line, new grow, new roots, new spikes, and even my Dendrobium aberrans will be blooming soon. Second species I haven't killed yet. 
__________________
Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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