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Problem with humidifier in enclosure

This is a discussion on Problem with humidifier in enclosure within the Semi Hydro / Lights / Greenhouses / Accessories forums, part of the Orchid Culture category; I have my plants on a stand enclosed in plastic. There are 2 fans that ...

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  1. #1
    nicki is offline Senior Member
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    Default Problem with humidifier in enclosure

    I have my plants on a stand enclosed in plastic. There are 2 fans that run off and on. Humidity trays weren't doing much so I attached a hose to an ultrasonic humidifier and ran it into the enclosure. It runs off and on. But it's done pretty nothing to raise the humidity. I thought for sure it'd be fool proof so I don't understand why nothing has really changed. I've tried different output adjustments, placement of the hose and changed it to run more often.
    Has anyone tried something similar or have any ideas on what would work? Or can maybe explain what this isn't working?

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    raybark is online now Senior Member
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    HI Nicki.

    First, you're better off leaving the fans on 24/7, as long as it's not a hurricane.

    Have you tried running the humidifier on its maximum setting?

    Basically, the moisture is escaping to the room around it and the rest of your home or apartment. The lower the RH outside of the "tent" the faster that will happen.

    One last question: You sure your gauge is working properly?

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    nicki is offline Senior Member
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    For the most part the fans run 15 on and 15 off. They are probably a little bit big for the area and even on the lowest setting maybe a tad too strong for the plants closest to them. Not a hurricane but not gentle. Also when the fans are running they can suck in a good but of the mist.

    Raising the setting on the humidifier puts out more mist but it falls down more quickly. It doesn't spread nicely.

    I have the plastic wrapped and clipped to the stand. It's not as secure as a vivarium but it's not just laying over it loosely.

    I have 2 different gauges and they both show a similar reading.

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    My experience with RH is that trays do not help that much, however when I placed expanded brick pellet in the trays and the water level just below them, it made a big difference in the greenhouse.
    Joe

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    Quote Originally Posted by nicki View Post
    <SNIP> Also when the fans are running they can suck in a good but of the mist.

    Raising the setting on the humidifier puts out more mist but it falls down more quickly. It doesn't spread nicely.</SNIP>
    That may work to your advantage: "Mist" is liquid droplets, so it is not "humidity" (vapor). If the fans draw in the mist and circulate it better, they should raise the humidity more efficiently without getting the plants wet.

    I'll also add that the hose/tube connecting the humidifier to the tent might be mechanically coalescing a lot of the droplets on the sidewalls, so they never do become vapor in the tent. Can the humidifier go inside of the tent?

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    nicki is offline Senior Member
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    Joe I've tried hydroton in the humidity trays when I first started up with orchids. I can't recall if it made a big difference. I just didn't like the added maintenance of cleaning the trays with them. The water does gunk up and with just a tray it's easy to wipe it out.

    Ray I was worried about too much mist being drawn into the fans and collecting on them, possibly damaging the fans.

    Yes the hose does collect some of the moisture (more than I'd like) but I can still see a good bit coming out.

    I did start off with the original humidifier in the enclosure on the shelf under the 2 plant shelves. However the mist could not reach up high enough to make an overall difference. It basically stuck to that shelf. Which led me to try using a hose to direct it more where I want it.

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    Default Indoor Humidity

    I have been able to maintain the humidity between 45 - 65% , I run three vaporizers on timers. Vaporizer # 1 will run for half a hour on and one hour off, then # 2 for a half hour and off one hour, then # 3 for a half hour on one hour off then back to # 1, while the T-5 lighting is on. I have a total of nine small fans. Six run during lighting and the other three run during the night time. So far so good. The only downside is the weekly descaling of the vaporizers & have to fill the vapoziers everyday. The clear shower curtain goes to the ceiling and is about 12" above the floor. This set up is in my basement, I had to set this up down there because I have cats that like to mess with the plants. The cats do not go into the basement. Have fun, Rich
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    Rich I took my ideas from your set up. I can't even keep the humidity above 50. I spent last weekend playing around with things. I think I will be doing the same this weekend. I tried having the humidifier on for 30min and off for 15. Still didn't accomplish much. I use distilled water so all I have to worry about is keeping stocked up on that.

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    I will say again: Mist is NOT Humidity.

    It doesn't matter where the mist does-, or does not go. If enough of it turns into vapor, the laws of nature (AKA Physics) will try to keep the humidity level uniform throughout the volume, and if you have fans, it will do so much more easily and quickly.

    So it appears that the bottom line is this: Either your enclosure is not "tight" enough to contain it, or you are simply not putting enough vapor into the air in the first place.

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    nicki is offline Senior Member
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    Quote Originally Posted by raybark View Post
    I will say again: Mist is NOT Humidity.

    It doesn't matter where the mist does-, or does not go. If enough of it turns into vapor, the laws of nature (AKA Physics) will try to keep the humidity level uniform throughout the volume, and if you have fans, it will do so much more easily and quickly.

    So it appears that the bottom line is this: Either your enclosure is not "tight" enough to contain it, or you are simply not putting enough vapor into the air in the first place.
    I understand mist is not humidity. Not once did I think it was. I use the term to refer to what the humidifier is putting out. It looks like a mist so I call it so. I already get that I need to do more tinkering to either tighten up any loose ends in the plastic or figure a way to allow more 'mist' into the enclosure. Which are the two main things I've been adjusting back and forth anyway. Plastic, humidifier output and fans are all things I'll continue to tweak.

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