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tedoro
ToadStool Tender



Registered: 02/06/15
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Selective gas exchange with monotub filters.
#27100660 - 12/21/20 10:36 AM (3 years, 1 month ago) |
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I rarely find something that others haven't already considered here.
So can someone get me up to speed on what the community knows about how different membranes allow different gases to pass though, and how that might affect filter choices when venting a monotub?
I've read there are membranes designed to allow water vapor to easily pass, yet disallowing the main air components.... and conversely, there is housing wrap, which easily allows air to pass but inhibits water vapor.
Wouldn't housing wrap be an interesting monotub filter? I am aware that we need some water vapor to leave the monotub, but I am sure some water vapor gets through house wrap. And mushies sure like fresh air, they just hate drying out.
and I wonder if micropore tape plays any favorites to gases.
-------------------- -------------------- Deep pour soft agar plates-->bags of WBS-->Low Profile Monos Clean spawn thread | Put a thermometer on your PC
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tedoro
ToadStool Tender



Registered: 02/06/15
Posts: 2,206
Last seen: 2 hours, 46 minutes
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Re: Selective gas exchange with monotub filters. [Re: tedoro]
#27100733 - 12/21/20 11:36 AM (3 years, 1 month ago) |
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After posting this, I've been reading about building wrap. There is a whole world to this stuff.
In particular, Im interested in Vapor barrier.
"Properly defined, a vapor barrier alone does not control air movement; it controls the movement of moisture. In fact, a vapor barrier is not actually a barrier; it’s a vapor diffusion retarder (VDR). A VDR regulates moisture flow from inside out or from outside in at the molecular level. This moisture control function happens wherever the VDR is used in the structure. Therefore, unlike an air infiltration barrier, the VDR does not have to be continuous, sealed, or free of holes; a perforation in a VDR simply allows more vapor diffusion in that area compared with other areas where vapor diffusion is less restrictive."
-------------------- -------------------- Deep pour soft agar plates-->bags of WBS-->Low Profile Monos Clean spawn thread | Put a thermometer on your PC
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tedoro
ToadStool Tender



Registered: 02/06/15
Posts: 2,206
Last seen: 2 hours, 46 minutes
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Re: Selective gas exchange with monotub filters. [Re: tedoro]
#27101361 - 12/21/20 06:13 PM (3 years, 1 month ago) |
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I think I'm completely talking about nonsense here. I kept reading and turns out, water vapor isn't easily removed from air by passing through a membrane. A "vapor diffusion reducer" also reduces air flow. They are pretty much tied together.
My apologies.
carry on.
-------------------- -------------------- Deep pour soft agar plates-->bags of WBS-->Low Profile Monos Clean spawn thread | Put a thermometer on your PC
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Leon Forest



Registered: 02/11/13
Posts: 574
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Re: Selective gas exchange with monotub filters. [Re: tedoro]
#27101474 - 12/21/20 07:09 PM (3 years, 1 month ago) |
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tedoro
ToadStool Tender



Registered: 02/06/15
Posts: 2,206
Last seen: 2 hours, 46 minutes
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Re: Selective gas exchange with monotub filters. [Re: Leon Forest]
#27101518 - 12/21/20 07:24 PM (3 years, 1 month ago) |
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Quote:
Indulgence said: this is a great read Thermodynamic Analysis of Monotub Air Currents
I've always had one grip with that post. and I'm likely wrong...
but with a monotub that has a warm sweaty substrate in it, I have a hard time believing that the air flow is downward. Humid air is light. Warm air is light. My lower holes always had indications that air was coming in, not out. But Maybe I was doing it wrong.
-------------------- -------------------- Deep pour soft agar plates-->bags of WBS-->Low Profile Monos Clean spawn thread | Put a thermometer on your PC
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