How Many FANS are NEEDED in a GREENHOUSE?
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- Опубліковано 13 січ 2018
- Want to grow your own food, and use automation to control it??? You need fans to move that air around. This is a multi part series where we will be going over each part of our off-grid, sustainable food and energy production project that we call Hab 1. In this video we will go over our current methods for circulating air in the greenhouse and bringing in more fresh air.
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Thanks buddy!
Thank u so much for answering my question of if other fans are needed and what direction to have them pointing in! I’m forever grateful!
Thanks Jeff. Realy informative. :)
Perhaps the loss of you crop due to fungal infestation was due to the settling of the spores in the micro humid areas around your top watered micro green growing trays? Be aware that even when you bottom water your crop, you will still get accumulated moisture around your greens as the plants themselves will aspirate as they photosynthesis during the day. I suggest that you may need to have air movement much closer to the actual action to interrupt the fungal parties.
You could do a “smoke test” to see/check if the air circulation is going the way you think it goes...
Great system! Are you also thinking of making a logo for the channel?
+Tokke van Leeuwen I'd love to... Just a time thing. If subscribers want to submit concepts I'd be open
so it probably would make sense to make the next habitat round, so the airflow is easyer and more economical to manage cheers.
It seems like an industrial version of a Venmar air exchanger makes more sense than that giant exhaust fan. It allows you to bring in the fresh and minimize the heat loss due to it having an efficient heat exchanger. Not to mention it would bring in a lower humidity air from outside which would help with moisture.
I already emailed Jeff about an air/air heat exchanger and never heard back from him. He could build it himself.
Great series of video. Thanks for the great content and educational. Also very interesting get my gears turning.. Why don't you try to install ventelation ducking to consentrating sir flow over the micro greens. I believe this if you install more fans might just cancel the current of air... Hmmm less is more sometimes.. Like stone in a pond the ripple affects.. If I'm correct. Just wanted to share my thoughts. Thank again for the great content
How about a geothermal type system?
Have you looked into a heat exchanger
Jeff, would it be practical to make concentration nozzles for the fans to blow closer to the tops of the flats and draw more moisture away from you seedlings?
If you can find them they are called DC motor fans they're a little bit more efficient than your normal AC motor fans I've seen them around where I live in use but I have no idea where people have purchased them they're usually in industrial cages they are a slow startup but they use less power might be something to do some research on if you're running that many fans. I know for us when we heat our Cottage we always run our ceiling fans on low to push the air around slowly as to not create a cooling effect but I imagine you're going for moving more air over the slight heat loss.
I don't think there is such a thing as too many fans, you just need to be wary of the stalker types.
lol...that's awesome
You awesome
Are you going to do mushrooms?
Just when everything is running perfect... seems there's something a little of on your camera's auto-focus. It isn't major but it is doing a focus correction throughout the parts where you're on camera and nearby. You may want to slow down the speed so it is even less noticeable.. best suggestion. Everything else is great and it isn't really distracting but thought you should know because this can become a bigger issue down the line.
The shot in the UV lights had no issues. Hope thats helpful.
thank you...I've noticed autofocus has been acting weird...i'll check into it
You should have enough CFM flowing to exchange the entire volume of air at least once in the greenhouse every 30 minutes (some would say faster) to produce proper supplementation, that’s if you aren’t going to supplement with co2 generators. You should really look into carbon filters/HEPA filters, especially after your mildew outbreak. You can get speed controllers for fans. More expensive to get started up but has the potential to save your crop in the future. Heating greenhouses are not cheap.
Some companies spend up to $40,000 a month in the cold season (per greenhouse) to heat properly and insure sustainability, but those are also multimillion dollar grows. Gotta keep in mind if you can’t get the equipment you need due to lack of funds, you will have major obstacles. Best of luck Martian!
Do you use the freezer to help heat the building, or do you vent it outside, or is the freezer a unit you just plug in?
we let the cooler vent directly into the building
I have a 20 ×120 how many fans will i need? And when do i turn the fan on?
Can you not get all the CO2 that the plants need from the the propan heater exhaust ?
The heater is exhausted to the outside due to CO safety
You will only use a small percentage of the exhaust and that part can, if needed, be run through a catalytic filter that convert CO to CO2 before it is wented into the greenhouse..
Where I live in Norway this is the main source used to increase the amount of CO2 in greenhouses.
you are talking about a lot of engineering and expense - not to mention added humidity - which is not needed at all
Not really.
1. You need a duct connected to the exhaust pipe
2. CO2 censor in the greenhause
3. CO sensor in the duct
4. Platinum Gauze 225 mesh 12 x 150mm
5. A valve in the duct operated based on CO2 mesurement
6. A heter element power supply
=$200-250 + work
If the CO in the exhaust gets to high, applay kow voltage over the mesh to heat it up. The CO to CO2 conversion should supply the heat needed to keep the reaction going.
or
a Johnsom CO2 generator/heater could be used at the price of $913.00. This would basicly be free to use since the use of propan in the large heater while be reduced. ( or any cheap catalytic heater should work fine, but a Johnsom can be fullly automated)
There would anyway be a lot of water in the air from outside so that is something that most be handeled anyway (Generating 132Kg CO2 will also produce 72l of water, but 132kg is a lot of CO2)
That is sure a good question. I understand that this vent was installed because they had too much CO2/CO from the heater. Now he is talking about needing to bring in outside CO2. If I understand it, plans can use either CO2 or CO.
Does anybody know why such a tall building is being used?
Ltifone2014 Jeff says for vertical growing... but has not demonstrated or shown this requirement... maybe on Mars... I strongly suggest, make it work locally before out of this world... Mars!
I suspect that he wants a tall building in order to contain (in one building) all of the troughs for fish, the hydroponic beds, etc. One heating, ventilating, dehumidifying, ... system serves everything.
Also, the tall greenhouse has minimal internal obstructions. A lower building would probably require internal columns (which would reduce freedom to arrange beds, troughs, etc.). Notice also that there's no transverse (side-to-side) bracing inside the greenhouse. It's just a series of arches that are joined laterally.
Also, in his area, snowfalls can be heavy. A steep roof will prevent snow from overloading the roof.
If only all of your 'fans' could subscribe
You'd have millions of subscribers like you deserve
Yep, sure sounds like subscribe request at 4:40.