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Offlineprimus
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Registered: 08/22/16
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FAE vs Humidity controls
    #23846919 - 11/18/16 10:01 PM (7 years, 2 months ago)

on my shiitake tent i have two 10a controllers that control humidity and temperature.



the problem ive run into is that my fans and fogger bucket are tied into the same output. so if the temperature goes above 20c the bucket kicks on and begins humidifing the tent... no matter what the humidity is.

this causes the humidity in the tent to always be at 90+%... rendering its controls useless.

i could solve this problem by putting the fans on a seperate relay or controller, to only kick on without the fogger, but then i would be pumping dry air into the tent and the humidity contoler would kick the fogger on anyway.

you can see the current enviromental conditions in the above picture.
shroomery info says humidity during fruiting shold be 60-80, which is what the humidity controller is set up for.


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OfflineKubo
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Re: FAE vs Humidity controls [Re: primus]
    #23847505 - 11/19/16 04:31 AM (7 years, 2 months ago)

Is your fan set up to run with PWM or do you run it at full speed at all times?

I'm working on a similar system, with the humidifier bucket and the fan also doing both humidity and FAE. The fan can run a full FAE solo if needed very fast, and for the rest it will run at a much lower speed slowly pumping in the fog (also rich in oxygen). Besides depending on the fog, I also use a layer of moist vermiculite in the grow chamber for passive humidity to balance the atmosphere. I will use a CO2 sensor to calibrate the system, you don't really need one in your permanent set-up, but it can give you valuable data to analyse how your environment is influenced by all the different factors.

As for temperature control, consider using a thermal mass inside the tent to have a more balanced temperature and to depend less on the fan.

In short, I would recommend to set up your system in such a way to be able to control the fan (with PWM) and humidifier separately.


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Offlineprimus
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Re: FAE vs Humidity controls [Re: Kubo]
    #23848236 - 11/19/16 11:14 AM (7 years, 2 months ago)

Quote:

Kubo said:
Is your fan set up to run with PWM or do you run it at full speed at all times?

I'm working on a similar system, with the humidifier bucket and the fan also doing both humidity and FAE. The fan can run a full FAE solo if needed very fast, and for the rest it will run at a much lower speed slowly pumping in the fog (also rich in oxygen). Besides depending on the fog, I also use a layer of moist vermiculite in the grow chamber for passive humidity to balance the atmosphere. I will use a CO2 sensor to calibrate the system, you don't really need one in your permanent set-up, but it can give you valuable data to analyse how your environment is influenced by all the different factors.

As for temperature control, consider using a thermal mass inside the tent to have a more balanced temperature and to depend less on the fan.

In short, I would recommend to set up your system in such a way to be able to control the fan (with PWM) and humidifier separately.




hey kubo, sorry what do you mean by pwm?


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Offlinedrake89
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Re: FAE vs Humidity controls [Re: primus]
    #23848471 - 11/19/16 12:39 PM (7 years, 2 months ago)

pulse width modulation, a way to change the speed of usually larger fan motors.  i recomend few air changes on shiitakes, but it might be easier to set your fan to a lower constant speed.  if you want to initiate pinning i would keep your humidty closer to 95 until the mushrooms are thumb sized.


--------------------
Fiery Fungi (like us on faeboo)


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OfflineGr0wer
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Re: FAE vs Humidity controls [Re: primus]
    #23848477 - 11/19/16 12:40 PM (7 years, 2 months ago)

Shiitake don't need FAE, how are you cooling? using outside air? What do you intend to use in the summer? If you want primo shiitake you want 93-98% RH so the stems are nice and soft and usable. A simple solution for your setup is separate your outlets for the humidity output, and yes you can have one cord from your cooling control and another cord from you RH control to the same fan. But again it sounds like you actually need more humidity so your not really having issues IMO.


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Offlineprimus
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Re: FAE vs Humidity controls [Re: drake89]
    #23848622 - 11/19/16 01:19 PM (7 years, 2 months ago)

Quote:

drake89 said:
pulse width modulation, a way to change the speed of usually larger fan motors.  i recomend few air changes on shiitakes, but it might be easier to set your fan to a lower constant speed.  if you want to initiate pinning i would keep your humidty closer to 95 until the mushrooms are thumb sized.




Variable speed control is what i think you mean. thats what i know it as.


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Offlineprimus
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Re: FAE vs Humidity controls [Re: Gr0wer]
    #23848676 - 11/19/16 01:32 PM (7 years, 2 months ago)

Quote:

Gr0wer said:
Shiitake don't need FAE, how are you cooling? using outside air? What do you intend to use in the summer? If you want primo shiitake you want 93-98% RH so the stems are nice and soft and usable. A simple solution for your setup is separate your outlets for the humidity output, and yes you can have one cord from your cooling control and another cord from you RH control to the same fan. But again it sounds like you actually need more humidity so your not really having issues IMO.




right now both controllers are hooked up to the same receptacle controlling the fogger and the fans. originally just the humidity controller did this but i added the temperature because i wanted to be able to see the temp in the chamber and add cooling if i had to. i am in a basement where the temperature is steady cool. so, i was just going to add a contactor and a separate receptacle for just the fans. that way, if it gets too hot the temp controller kicks on only the fans. if it gets too dry, (which it never does) the humidity controller powers the contactor which powers two receptacles feeding the fogger and the fans.

the tent never drops humidity unless i open the door. in fact its set for 80 but it climbs to 100 on its own and stays there. I thought since shroomery data lists the fruiting requirements for humidity at 80% i was going to use dry air to bring it down and cool at the same time.


Edited by primus (11/19/16 01:36 PM)


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Offlineprimus
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Re: FAE vs Humidity controls [Re: primus]
    #23848682 - 11/19/16 01:35 PM (7 years, 2 months ago)

what are my options for cooling? swamp bucket? hack in a portable ac? those are the only two i can think of.


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OfflineGr0wer
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Re: FAE vs Humidity controls [Re: primus]
    #23848710 - 11/19/16 01:42 PM (7 years, 2 months ago)

A window mount AC will work but they clog up quick with spores if your not cleaning it on a schedule. How big is your chamber?


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Offlineprimus
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Re: FAE vs Humidity controls [Re: Gr0wer]
    #23848731 - 11/19/16 01:48 PM (7 years, 2 months ago)

Quote:

Gr0wer said:
A window mount AC will work but they clog up quick with spores if your not cleaning it on a schedule. How big is your chamber?




its a grow tent, roughly 3 x 7 in size.



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OfflineGr0wer
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Re: FAE vs Humidity controls [Re: primus]
    #23848799 - 11/19/16 02:08 PM (7 years, 2 months ago)

How hard would it be to A/C the room its in?


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Offlineprimus
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Re: FAE vs Humidity controls [Re: Gr0wer]
    #23848806 - 11/19/16 02:12 PM (7 years, 2 months ago)

Quote:

Gr0wer said:
How hard would it be to A/C the room its in?




not possible. its in an open basement.


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