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Having High humidity 😫 Problems need help

  • Thread starter Thread starter Jayvelo86
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Having High humidity 😫 Problems need help

Jayvelo86 23 Replies 2,268 Views
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Jayvelo86

Jayvelo86

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#1
Im having high humidity problems and can't understand why I have a 10x20 grow tent 48 plants, 2 ac, 35 pint dehumidifier running 24/7 to keep the humidity low 80% lights on with lights off 70% exhaust fans are at 5 speed and my humidity don't go down anyone have a recommendation a video and picture of my set up thank you.
 

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#2
What's the humidity of the air you're pulling in, and what CFM are the exhaust fans? The exhaust fans should recycle the air in the grow area in about 1-3 minutes. 10x20 is 200 sq ft x the height of the room will give you your cubic feet, assuming an 8 foot ceiling thats 1600 cu feet, bare minimum would be just over 500 cubic feet/min on the fan(s).
 
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#3
I guess the 48 plants and wet dirt are making huge humidity. I would assume since your day humidity is bigger than night
 
#4
At a certain point dehumidification will bypass stand alone 35-50 pint dehumidifiers.
Based on just simple recommendations you would need 3 50 pint units that would have a heat load of 2500 watts.
My recommendations are to get a professional HVAC company for a 200sf for profit grow concern.
 
#5
Phyto said:
What's the humidity of the air you're pulling in, and what CFM are the exhaust fans? The exhaust fans should recycle the air in the grow area in about 1-3 minutes. 10x20 is 200 sq ft x the height of the room will give you your cubic feet, assuming an 8 foot ceiling thats 1600 cu feet, bare minimum would be just over 500 cubic feet/min on the fan(s).
Click to expand...
Humidity out the tent is low 60% not higher than 67% i have 2 6" inline fan around 800 cfm tent is 7 foot high i also have 2 8" inline but the negative pressure is very strong if I put the 8"
 
#6
Phyto said:
What's the humidity of the air you're pulling in, and what CFM are the exhaust fans? The exhaust fans should recycle the air in the grow area in about 1-3 minutes. 10x20 is 200 sq ft x the height of the room will give you your cubic feet, assuming an 8 foot ceiling thats 1600 cu feet, bare minimum would be just over 500 cubic feet/min on the fan(s).
Click to expand...
The humidity is around low 60% no higher than 67% cfm around 800
JIMKSI64 said:
At a certain point dehumidification will bypass stand alone 35-50 pint dehumidifiers.
Based on just simple recommendations you would need 3 50 pint units that would have a heat load of 2500 watts.
My recommendations are to get a professional HVAC company for a 200sf for profit grow concern.
Click to expand...
I have another 35 dehumidifier i will put that one also to see if it make a difference thank you for your advice.
 
#7
It might not be enough or just not applicable to you being in a tent ( im in a shed) i played around with some positive pressure, inlet fan on a little higher than your exhaust fan. But then you start muffin all your other parameters lol. Something for the think tank though! ✌️
 
#8
BearWater said:
It might not be enough or just not applicable to you being in a tent ( im in a shed) i played around with some positive pressure, inlet fan on a little higher than your exhaust fan. But then you start muffin all your other parameters lol. Something for the think tank though! ✌️
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Can you go more in details don't mind trying something that works from other the pic is night time
 

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#9
Jayvelo86 said:
Can you go more in details don't mind trying something that works from other the pic is night time
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might be worth a shot. At least to see for yourself : ) im not an expert at the science but simply put, turn your inlet fan on like “6”and your exhaust port fan on “3”. That creates a positive pressure within in the tent which squeezes some of the moisture out of the room so to speak (and that could be off also). I would have to go back and look at my thread to see how much it was dropping the humidity, but it did work to some extent 👍
 
#10
First, focus on the exhaust. Make the outlet as large as possible. Make the supply passive. Also, place the channel ventilators inside the room. Install a smaller but longer duct on the entrance side.Try lowering the lamps and reducing the power, which will help lower the temperature.🤝
 
#11
This thing doesn't work. It only increases plant transpiration. Make the air masses move with powerful channel ventilators.Use powerful fans inside, like this white one, to increase the air speed, but don't point it at the plants.
 

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#12
60% is low there???? I am so glad I do not live there. 🤕
 

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#13
To be honest, I worked in a 90% humidity environment, which was unpleasant. I can tell you that it's important to maintain air movement, but keep in mind that the ventilation system's power should match the lighting's power. This is a rough estimate for high-humidity environments. However, you may need more. Currently, I have a 50-watt lamp and a 40-watt exhaust fan in my box. Even at night, the humidity does not exceed 70%.It is assumed that the lamps reduce the humidity. But I would still notice if they were hot, because at higher temperatures, the rate of evaporation is higher. In any case, it is desirable to keep the air moving. It all depends on where the air collects moisture. If it is indoors, it is better to make it cooler, and if it is outdoors, it is better to make it warmer.In my case, the air is humidified inside the tent. This is because the humidity outside is 63%. However, I have more than 20 liters of soil in my 60x60 tent.
 

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#14
ForestSpirit said:
First, focus on the exhaust. Make the outlet as large as possible. Make the supply passive. Also, place the channel ventilators inside the room. Install a smaller but longer duct on the entrance side.Try lowering the lamps and reducing the power, which will help lower the temperature.🤝
Click to expand...
Lamps are at 60% low already only 614 ppfd
 
#15
ForestSpirit said:
This thing doesn't work. It only increases plant transpiration. Make the air masses move with powerful channel ventilators.Use powerful fans inside, like this white one, to increase the air speed, but don't point it at the plants.
Click to expand...
i have 2 4" inlet fan that I can put it in the floor sucking air I'm going to test it and see
 
#17
When my humidity gets high I just turn on my AC. It works pretty well in my situation and I'm in the backwoods of PA where 70-80% outside is the norm. I use one of those window units.
 
#18
This could be a black box type of analysis. In this case, the tent is the box. To maintain a stable relative humidity within the box, the amount of water that goes into it must equal the amount of water that comes out of it. A reasonable estimate might be that a mature plant transpires a quart per day. At that rate, total transpiration inside the box by 48 plants would be 12 gallons per day. To achieve a stable RH, the total dehumidification capacity would need to be at least that much. A 35-pint dehumidifier can do 8.75 gallons per day and thus would be inadequate.
 
#19
7munkee said:
When my humidity gets high I just turn on my AC. It works pretty well in my situation and I'm in the backwoods of PA where 70-80% outside is the norm. I use one of those window units.
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I have 2 14,000 btu ac pumping could air inside
 
#20
LoveGrowingIt said:
This could be a black box type of analysis. In this case, the tent is the box. To maintain a stable relative humidity within the box, the amount of water that goes into it must equal the amount of water that comes out of it. A reasonable estimate might be that a mature plant transpires a quart per day. At that rate, total transpiration inside the box by 48 plants would be 12 gallons per day. To achieve a stable RH, the total dehumidification capacity would need to be at least that much. A 35-pint dehumidifier can do 8.75 gallons per day and thus would be inadequate.
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I was thinking the same thing I was just today looking at a episode from jug dealers podcast where they are explaining basically the same thing you are explaining which how much I'm feeding is the amount of water I need to dehumidifier i just got a new 35 pint i haven't made a custom exhaust box due to the heat to send out the tent after I make it i will test it to see if that works thank you
 
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