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Multi-tub ducted air plenum system? (Bouncing idea around)
    #14190878 -

I've been wondering lately if anyone's ever built a plenum (mixing chamber) into which fresh (possibly filtered) air is pumped, humidity is provided (ultrasonic humidifier, and temperature is adjusted, with the plenum then ducted to one, or a number of tubs/chambers/mini-greenhouses?

My thinking is that with the large amount of humidity an ultrasonic can provide, you could just turn it to max, have a heating element (whatever variety you prefer) thermostatically controlled, and then ramp up your fans until RH dropped below 100% at the exhaust.

This would allow for maximum possible FAE at high RH, with temp control, and more importantly remove the need to build/maintain growing chambers, as cakes would just be placed on a rack in a standard tub with an inlet hole and exhaust hole, making scaling he system up relatively quick/cheap/easy.

Admittedly light would still need to be sorted, but I leave mine stacked near the window in my spare bedroom, so that might not be an issue depending on your setup.

I'll be giving it a shot when I get the chance, but in hte meantime, does anyone have any thoughts on the concept?

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14190894 -

Fairly common. Filtered air is pushed into a chamber like a 5 gal bucket with water and one of those ultrasonic fog making floaty devices, which is then distributed to the tubs via pvc.

Automating it by RH isn't really necessary. Usually it's just on a timer. Humidity controls are for a whole room usually. Look up ratdog's wet bulb for an interesting setup.


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The above post is fictional, hypothetical, or downright nonsensical.


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Edited by anonjon (03/27/11 07:13 AM)

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14190901 -

You don't really want constant high humidity like that.


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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Doc_T]
    #14190918 -

anonjon said:
Fairly common. Filtered air is pushed into a chamber like a 5 gal bucket with water and one of those ultrasonic fog making floaty devices, which is then distributed to the tubs via pvc.

Automating it by RH isn't really necessary. Usually it's just on a timer. Humidity controls are for a whole room usually. Look up ratdog's wet bulb for an interesting setup.


Ahk, cheers.  I wasn't talking about automating it with regards to humidity, just turning the fan speed up manually until you reach the limit of the ultrasonic's capacity to keep RH up.

Doc_T said:
You don't really want constant high humidity like that.


Why's that?

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14190927 -



This is spongiform's setup. I think you would enjoy this thread.


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The above post is fictional, hypothetical, or downright nonsensical.


:moon:  :moon:  :moon:  :moon:    :moon:

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14191059 -

Fischer said:
Why's that?


A fluctuating humidity will work better than steady saturation.  Evaporation of moisture from the substrate is the number 1 pinning trigger.

For example, in our shiitake farm, we spray the floor, walls, ceiling and substrates twice or more daily.  This brings the humidity up to 99%.  I then let it drop to 75% before spraying again, which takes four to five hours.  With cubensis, try letting the humidity drop to 85% between misting sessions.  Remember, it will still be nearly 100% humidity right at the substrate surface, which is what is needed for primordia formation, but the evaporation into the less humid air is a pinning trigger.

As for a ducted plenum, those have never worked out well for people here.  The problem is that all your moisture will go to the tub that is fed with the shortest hose or the largest hose.  If you try to put the tubs in series, the first one gets flooded and the rest dry out.  Also, the hoses are a major bacteria breeding ground.
RR


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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: RogerRabbit]
    #14192749 -

Thanks anonjon, that's pretty much exactly what I was suggesting.  Nice little setup, that.

RR, cheers for the explanation.  I never considered the bacteria factor.

I wonder whether having the ultrasonic on a timer that dropped exhaust RH to a lower value (say 50-70%) would be enough to provide the humidity cycling you mention and possibly dry out the tubing enough to prevent bacterial growth as well?

The main reason I'm pondering this is because like a lot of people I imagine, my job keeps me from being able to attend to my tubs for 8-10 hours during the day.

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14192867 -

A simple timed schedule is sufficient. 15 minutes every 2 hours for example.


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The above post is fictional, hypothetical, or downright nonsensical.


:moon:  :moon:  :moon:  :moon:    :moon:

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: anonjon]
    #14196061 -

Wouldn't dropping the humidifier off completely while keeping (relatively) high airflow dry out the substrate too much in between cycles?

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14196786 -

The fan only comes on when the humidifier does.

I'm not advocating these setups btw. I think the passive tubs make more sense. Another good setup is by a guy named wattballast. You ought to look up his thread on that...there's one thread where he and spongiform are trading notes/trying diff shit.


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The above post is fictional, hypothetical, or downright nonsensical.


:moon:  :moon:  :moon:  :moon:    :moon:

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14269746 -

I did something similar, but the plenum is actually the fruiting chamber.

Container 1 has a fan that creates a vacuum in the fruiting chamber.
The FC is connected to a container with an ultrasonic mist.
The container with the mist has a filtered entry for fresh air.

The fan and ultrasonic mister have their own timer.

FAE occurs when just the fan is on.

If moist air is needed, both the fan and the ultra sonic mister are on.


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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: shubrick]
    #14270909 -

Did you have a contamination problem, or notice any decline in eventual contamination with a filtered intake setup?

Also (semantics), in this instance the plenum is the US, not the FC.

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14273097 -

I didn't see any contaminations, but I've only done one grow with it. The trick is to not make the vacuum so strong that air leaks into the FC from a source other than the plenum (with the Ultrasonic).  So, I've got weather stripping and a pretty tight seal around the FC.

In preparation, I cleaned the heck out of it, and when it was time to harvest and dunk for another grow, I cleaned everything (especially the tubes).

I appreciate the semantic correction..

Edited by shubrick (04/11/11 04:01 PM)

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: shubrick]
    #14276997 -

I don't suppose you've had the chance to compare it to the SGFC?

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: Fischer]
    #14277887 -

Compared on what criteria? I tried the SG but my house is too cold. Maybe there ate other reasons why I didn't get good growth but my thing worked well. Also, my intent was to try this and then do a green house version, something where  I can do pan cyans.

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Re: Multi-tub ducted air plenum system? (Bouncing idea around) [Re: shubrick]
    #14280383 -

Criteria would be total fruit yield, time from birthing to fruiting and contamination problems (if any) I suppose.

If I can build an automated chamber that performs comparably with an SGFC (which seems to be the yardstick around here), then why not?  And the temps in my house are 60-65, though I've managed to keep the SGFC's humidity at 95%+ without much effort so far.

*EDIT* Mind you, I guess you could only really directly compare fruiting chambers using an isolate, and having both cakes/casings going in each the same time.

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