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Offlinediablovt1125
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Heat Bomb in Mini Green House
    #7585678 - 11/01/07 09:23 PM (16 years, 2 months ago)

I am having troubles maintaining proper humidity in my mini green house (About 1/3 the size of a Martha). I am using a ceramic heater fan in a small room to maintain temps, but when I run the fan, the humidity in my greenhouse drops. When I don't run the fan, it is a perfect 95% humidity. First i was running the fan pointed towards the greenhouse. Now I have moved it so it is facing an adjacent wall (not too close though) and it seems to help a little with my humidity problem. I was wondering if a heat bomb, maybe a 10gallon aquarium heater in a 2 liter bottle, would be adequate to heat my mini greenhouse?

Thanks


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OfflineBlueRidge
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Re: Heat Bomb in Mini Green House [Re: diablovt1125]
    #7586872 - 11/02/07 08:20 AM (16 years, 2 months ago)

you'll need something bigger than a 10 gallon heater. i haven't tried to heat a mini greenhouse, but i would get a 100 or 150watt heater and see how that works. good luck


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OfflineRogerRabbitM
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Re: Heat Bomb in Mini Green House [Re: BlueRidge]
    #7586876 - 11/02/07 08:23 AM (16 years, 2 months ago)

You want to heat the room, not the grow area or you'll have condensation problems.
RR


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Offlinediablovt1125
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Re: Heat Bomb in Mini Green House [Re: RogerRabbit]
    #7587365 - 11/02/07 11:17 AM (16 years, 2 months ago)

Thats what im doing currently RR. But the problem im having is when the room gets around 73-75 degrees, my RH is dropping to about 85%. When I turn my heater off, or face it completely away, my RH goes back to around 90-95%, but my temps fall to around 68 degrees. I've been trying to fine tune this for the last two days but with only so much success... any thoughts?


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Offlinesoulsizzle
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Registered: 05/17/05
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Re: Heat Bomb in Mini Green House [Re: diablovt1125]
    #7587528 - 11/02/07 11:57 AM (16 years, 2 months ago)

What are you using to maintain your humidity? The drop in RH indicates that the heater you are using is pushing fresh air into your green house which, in turn, is pushing the humid air out. Fresh air is always a good thing, so my goal would be to find a solution that provides more humidity and keep the heater that you have.

If you like the humidification method that you have, a cheap space heater without a fan might be a better option.


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Invisiblemycocurious
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Re: Heat Bomb in Mini Green House [Re: diablovt1125]
    #7588144 - 11/02/07 02:41 PM (16 years, 2 months ago)

Quote:

diablovt1125 said:
Thats what im doing currently RR. But the problem im having is when the room gets around 73-75 degrees, my RH is dropping to about 85%. When I turn my heater off, or face it completely away, my RH goes back to around 90-95%, but my temps fall to around 68 degrees. I've been trying to fine tune this for the last two days but with only so much success... any thoughts?




That's simply because of the change in temperatures, not because it's blowing your humidified air away. Relative Humidity is a ratio of how much water vapor is contained in the air at a given temperature for a given air pressure. Since are air pressure isn't really changing much in this case, it's a direct function of the change in temperature.

Or, in other words, because warmer air can hold more water vapor than colder air can, it takes more moisture to create 95% @ 75(F) than it does to create 95% RH @ 68(F). This is where the dew-point comes into play. At a given temperature, for a given relative-humidity there is a corresponding temperature at which the air becomes saturated and cannot hold anymore water-vapor. At this point it condensation forms on surfaces as the air off-loads the excess moisture.

So, in your case, the amount of water-vapor in the air is not changing at all, it's just because the temperature is fluctuating that you're noticing the RH jumping around.

Here's a fun link to determine the RH / Dew-Point / Temp /
http://einstein.atmos.colostate.edu/~mcnoldy/Humidity.html


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:justdontknow: Don't mistake my tone for a "matter-of-fact" attitude.  I'm just presenting what I believe to be correct, until I'm corrected...

- How Myco-Curious Prepares Coir & Compost Substrates
- How Myco-Curious Builds A Bulk Humidifier
- How Myco-Curious Builds An Automated Greenhouse
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figgusfiddus said:
Keep in mind that inoculating or whatever in front of a flow hood won't help your bad substrate, your bad inoculant, your bad sterile procedure, etc. etc. etc. It's not a +3 flowhood of magic, it's just a tool.


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Invisiblemycocurious
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Re: Heat Bomb in Mini Green House [Re: mycocurious]
    #7588181 - 11/02/07 02:55 PM (16 years, 2 months ago)

I forgot to bottom line it... :foreheadslap:

Set up the rig so that you have those 75(F) temps again and then we can start examining your fruiting chamber for ways to bolster the RH...but it's infinitely easier to fix RH issues when the temps are steady.


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:justdontknow: Don't mistake my tone for a "matter-of-fact" attitude.  I'm just presenting what I believe to be correct, until I'm corrected...

- How Myco-Curious Prepares Coir & Compost Substrates
- How Myco-Curious Builds A Bulk Humidifier
- How Myco-Curious Builds An Automated Greenhouse
------------------------------------
figgusfiddus said:
Keep in mind that inoculating or whatever in front of a flow hood won't help your bad substrate, your bad inoculant, your bad sterile procedure, etc. etc. etc. It's not a +3 flowhood of magic, it's just a tool.


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Offlinediablovt1125
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Re: Heat Bomb in Mini Green House [Re: mycocurious]
    #7588645 - 11/02/07 05:04 PM (16 years, 2 months ago)

Thanks for the thorough follow up myco. I have faced the heater completely away from the FC and set the temp to 71. The fruiting chamber has risen again to 95% and about 70 degrees. Ill bump the temp a little more and monitor what happens when the fan is faced 180 degrees away, it seems to help quite a bit. In the mean time I hope my newly fruited casings are doing alright with the unsteady environment. Cross your fingers for me.

And to answer what im using for humidification, a simple cool mist hooked up to the mini green house. I know it is adequate b/c I used the same setup in my old residence in my closet and set the ambient temp of the room to 75 (which was easily achieved due to proper insulation of the building). Now I live in a one hundred year old home with terrible insulation and its much colder in my room over all, hence a space heater inside the current closet I have. Basically I don't have a thermostat for just my room anymore so its impossible to keep just my space at 75, we'd have to keep the whole house at that and it would be far too costly.


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Offlinesoulsizzle
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Re: Heat Bomb in Mini Green House [Re: diablovt1125]
    #7589226 - 11/02/07 07:44 PM (16 years, 2 months ago)

75 is a little warm for a casing. I would bring it down a little bit closer to room temperature.


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