Anyway to DEHUMIDIFY without HEAT?!?

[pftek]

Got a room with 60% humidity. Large DWC setup. Tried dehumidifier and it's on all the time and still not lowering humidity.

I feel the HEAT from the dehumidifier is creating humidity by raising the temperature of the room.

Thoughts?

Anyone try salt or some type of desiccant?

 

[Space Ghost]

how bout an A/C unit with a built in dehumidifier? you'll have to have a burp room or the outside to exhaust to, but it will work... I wouldn't use a desiccant because though it would take some water out of the air, it would "use up" pretty quick and it would become more of a hassle than it's worth.

by "Large DWC setup" what do you mean? how large is large?

 

[pftek]

how bout an A/C unit with a built in dehumidifier? you'll have to have a burp room or the outside to exhaust to, but it will work... I wouldn't use a desiccant because though it would take some water out of the air, it would "use up" pretty quick and it would become more of a hassle than it's worth.

by "Large DWC setup" what do you mean? how large is large?

gallons

 

[Space Ghost]

dang, that's a lot of water to be working with... I'd go with a very large supplementary AC unit, or have a small(ish) sealed room before your intake with a large dehumidifier in it and dry the air before it ever enters the grow?

I just dont know... I only grow with 2kw so im trying to scale things up mentally, but I just don't see any obvious solutions...

 

[numberguy]

If you have a cooler area to work with an air still will dehumidify also a stand up portable room air conditioner vented out of the room will dehumidify with minimal heat.

 

[b8man]

Do you currently have fresh air coming into the room and the bad air being sucked out? Because that seems to me to the obvious way to get the humidity down - increase the air-circulation with a less humid air (if possible).

Desiccants won't work for a room that big. They work fine for things sealed in jars, but don't really take down the humidity in a large area.

 

[twelsch24]

b8man is right. The first solution to solving a humidity problem is increasing your exhaust / ventilation.

This happens in a larger scale in 'architecture' as well. Picture a theater full of people. That space is going to get muggy/dank from all the breathing, unless there's something like 5 'air-changes' an hour. Think big air handling units on top of a building.

Once your exhaust is exhausting alot, then you can dehumidify the larger space that the grow gets it's intake/exhaust from.

T

 

[Tr33]

^^^not if he's running a CO2 sealed room.

you will need a larger dehuey maybe even 2 large units and a bigger ac
if running a sealed room as I suspect.

what's your room setup?
sealed or no?
size room
size lights
etc
need more info to help

 

[medwa]

So . . . we don't know the rating of his current dehumidifier nor the size of the room.

 

[Crusader Rabbit]

...nor do we know the number of plants transpiring, nor the ventilation conditions. All we know is that his "Large DWC setup" is measured in "gallons".

 

[SCROG McDuck]

What's wrong with 60% humidity?

Vapor Pressure Deficit.. humidity vs air temps:
http://urbangardenmagazine.com/2010/07/plantworks-part-1-humidity-and-vapor-pressure-deficit/

Larger Dehumidifier.. running only when lights are off.

 

[Ravi Singh]

What's wrong with 60% humidity?

Vapor Pressure Deficit.. humidity vs air temps:
http://urbangardenmagazine.com/2010/07/plantworks-part-1-humidity-and-vapor-pressure-deficit/

Larger Dehumidifier.. running only when lights are off.

Yeah, what he said ^^^^

Also, heat from a dehuey doesn't add to humidity; if a room warms up, the RH% goes down (all else equal). That's why it's called "relative" humidity - it's a function of water vapor in the air and temperature.

Be happy with your 60% (which is fine) and keep it movin'.

 

[PrivateAero]

gallons? that doesn't seem very big

 

[eyes]

If the room runs too hot the dehumidifier doesnt do its job properly.How big is the room and how many lights are u running? Are the air cooled? It is correct as the temp goes up,the humidity will go down ,unless the water vapor in the air hasnt anywhere to go.Vent the room properly with fresh,cool winter air.Usually thats enough to take care of the water vapor in the air.Run the dehumidifiers at night when the lights are off and the heat load is low.If theres too much heat from the lights,youll need to cool them(vent) to remove some of the heat load so the dehumidifiers arent working so hard.

What kinda dehumidifiers are u running?