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OfflineBlue Eyed Devil
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Low environmental RH and drilling new #1719 tubs
    #18862128 - 09/19/13 09:22 AM (10 years, 4 months ago)

Hey everyone. Just grabbed some new tubs and getting ready to make SGFCs. My RH in my house is low 30's - high 20's. I'm thinking about drilling 1/8" instead of the standard 1/4" holes.
I'm hoping this will keep the fc from drying out so quickly.
I'm thinking if I drill the bottom holes the standard 1/4" I will have created a bit of a venturi effect causing more airflow from the bottom through the perlite and then the moisture will be somewhat restricted on exiting the fc. Creating a higher RH inside chamber.

Peer Review?


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Offlineblojo02184
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Re: Low environmental RH and drilling new #1719 tubs [Re: Blue Eyed Devil]
    #18862169 - 09/19/13 09:33 AM (10 years, 4 months ago)

Alot of people are going to say that you need to stick to the tek.

im going to tell you, since you said tubs, make 1 to the tek and the other your way. then come back and tell us what you found out.

another thing you could do is get a humidifier for your house/room.


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OfflinePussyFart
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Re: Low environmental RH and drilling new #1719 tubs [Re: Blue Eyed Devil]
    #18862180 - 09/19/13 09:36 AM (10 years, 4 months ago)

Quote:

Blue Eyed Devil said:
Hey everyone. Just grabbed some new tubs and getting ready to make SGFCs. My RH in my house is low 30's - high 20's. I'm thinking about drilling 1/8" instead of the standard 1/4" holes.



Don't....just follow the tek.

Drilling smaller holes will not help anything, it will only hurt.

Quote:

Blue Eyed Devil said:
I'm hoping this will keep the fc from drying out so quickly.



All it will do is lower your RH.

Quote:

Blue Eyed Devil said:
I'm thinking if I drill the bottom holes the standard 1/4" I will have created a bit of a venturi effect causing more airflow from the bottom through the perlite and then the moisture will be somewhat restricted on exiting the fc. Creating a higher RH inside chamber.

Peer Review?



I doubt it would work.

I would do this as an experiment only, but not with cakes I was depending on.

Stick with what is known to work for great results.

If your worried that your low RH might affect the SGFC, get a humidifier and humidify the room it's in.


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Offlinehgmstl
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Re: Low environmental RH and drilling new #1719 tubs [Re: blojo02184]
    #18862190 - 09/19/13 09:38 AM (10 years, 4 months ago)

I have under 20% humidity in my house.
A PROPERLY BUILT sgfc will hold proper humidity. Measure each hole out.
Or you can do as the friend above said and do one of each. Would be a fun experiment.


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OfflineBlue Eyed Devil
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Re: Low environmental RH and drilling new #1719 tubs [Re: hgmstl]
    #18862305 - 09/19/13 10:04 AM (10 years, 4 months ago)

I have done my other tubs to the letter from the TEK. I'm not happy with how it performs. Cakes sometimes/ too often blue and perlite dries out quickly. 7-10 days.

Notahacker420- how would smaller hole make the tub drier? You said it will lower my RH. IF ( they might be ) the holes were too small it would keep moisture in due to lack of FAE. Right? Now if I created too much of an airflow it would indeed reduce the RH. The remedy then would be to chase the 1/8" holes with the 1/4" drill bit. Then were back to the TEK specs.

How many of you know what a venturi effect is? Any mechanics/fabricators in the house?

Is this theory wrong about open and restricted air flow? if you reduce the opening, you gain velocity which instead of carrying gasoline like a carburetor, its carrying water up and out of perlite.

I am a newbie and I WILL listen to proper instruction. But the amount of contaminated TEK threads on this forum is insane. So, I'm just thinking about options and ideas, sharing them, and hopefully get proper up to date information.


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Offlineretaardvark
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Re: Low environmental RH and drilling new #1719 tubs [Re: Blue Eyed Devil]
    #18862566 - 09/19/13 11:11 AM (10 years, 4 months ago)

Quote:

Blue Eyed Devil said:
I have done my other tubs to the letter from the TEK. I'm not happy with how it performs. Cakes sometimes/ too often blue and perlite dries out quickly. 7-10 days.

Notahacker420- how would smaller hole make the tub drier? You said it will lower my RH. IF ( they might be ) the holes were too small it would keep moisture in due to lack of FAE. Right? Now if I created too much of an airflow it would indeed reduce the RH. The remedy then would be to chase the 1/8" holes with the 1/4" drill bit. Then were back to the TEK specs.

How many of you know what a venturi effect is? Any mechanics/fabricators in the house?

Is this theory wrong about open and restricted air flow? if you reduce the opening, you gain velocity which instead of carrying gasoline like a carburetor, its carrying water up and out of perlite.

I am a newbie and I WILL listen to proper instruction. But the amount of contaminated TEK threads on this forum is insane. So, I'm just thinking about options and ideas, sharing them, and hopefully get proper up to date information.





Smaller holes will lower your RH because the increased volume of gas exchange through upper holes pulls in more air through your perlite, meaning more fresh air that is more-frequently passing through moist perlite.

I live in an arid low desert. I designed my SGFC with 1/4" all along the bottom, and then around the sides and lid 1/4" interspersed by 1/8". My FAE was way low, as evidence by evaporation rates.

I drilled out all my 1/8" to 1/4", and I can visibly see an enormous increase in fluid deposition on the sides of my tubs. I know this is generally a sign of relative temperature differential, but my observations somewhat control for temperature swings.

Awaiting first fruiting performance, but I am confident it will blow away previous design.

As far as the venturi effect...it's present in any site of gas exchange in a fruiting chamber, but I dare say it doesn't matter much. So what if the fluid speeds up as it passes through the bottom into your chamber? If the volume of air inside isn't allowed to exit easily, more air won't be pulled in; I don't think the difference in air exchange speed between 1/8" and 1/4" holes makes up for the four-fold difference in area.


Edited by retaardvark (09/19/13 11:11 AM)


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OfflineRogerRabbitM
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Re: Low environmental RH and drilling new #1719 tubs [Re: retaardvark]
    #18862598 - 09/19/13 11:17 AM (10 years, 4 months ago)

Quote:

retaardvark said:So what if the fluid speeds up as it passes through the bottom into your chamber? If the volume of air inside isn't allowed to exit easily, more air won't be pulled in; I don't think the difference in air exchange speed between 1/8" and 1/4" holes makes up for the four-fold difference in area.




That part of the science is not about air exchange, but rather humidity.  As the velocity of the air increases around the granules of perlite, so too does the amount of water absorbed into that air from the perlite.

Stick to the shotgun terrarium tek, especially in a desert environment.  Using smaller holes will lower both air supply and humidity.
RR


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OfflineBlue Eyed Devil
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Re: Low environmental RH and drilling new #1719 tubs [Re: RogerRabbit]
    #18862631 - 09/19/13 11:26 AM (10 years, 4 months ago)

ok.

Thanks!
:thumbup:


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OfflineRogerRabbitM
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Re: Low environmental RH and drilling new #1719 tubs [Re: Blue Eyed Devil]
    #18863147 - 09/19/13 01:44 PM (10 years, 4 months ago)

Quote:

Blue Eyed Devil said:
I have done my other tubs to the letter from the TEK. I'm not happy with how it performs. Cakes sometimes/ too often blue and perlite dries out quickly. 7-10 days.






This simply means you're not misting enough. :shrug:
RR


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OfflineBlue Eyed Devil
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Re: Low environmental RH and drilling new #1719 tubs [Re: RogerRabbit]
    #18863298 - 09/19/13 02:23 PM (10 years, 4 months ago)

Quote:

RogerRabbit said:
Quote:

Blue Eyed Devil said:
I have done my other tubs to the letter from the TEK. I'm not happy with how it performs. Cakes sometimes/ too often blue and perlite dries out quickly. 7-10 days.






This simply means you're not misting enough. :shrug:
RR




Damn... I suck again!


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