Heat in sealed room with LED

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pahpah-cee

Well-Known Member
Hey dudes,

im in the trial phase of my new room before plants gets introduced into the environment.

my room is running hot! It’s small, 9ft x 3.5ft. Running two hlg 550v2’s. The AC keeps it around 88degrees F. when I get on a latter and get above my LEDS I can feel a good 20 degree difference in air temp.

My a/c isn’t the most powerful. Before I go out and buy a new A/C should I try remote mounting the drivers outside of the room? It seems like the most logically thing to do to mitigate the heat.
 
Herb & Suds

Herb & Suds

Well-Known Member
pahpah-cee said:
Hey dudes,

im in the trial phase of my new room before plants gets introduced into the environment.

my room is running hot! It’s small, 9ft x 3.5ft. Running two hlg 550v2’s. The AC keeps it around 88degrees F. when I get on a latter and get above my LEDS I can feel a good 20 degree difference in air temp.

My a/c isn’t the most powerful. Before I go out and buy a new A/C should I try remote mounting the drivers outside of the room? It seems like the most logically thing to do to mitigate the heat.
Click to expand...
Seems like that would work if your intake air isn't coming from that room
If it is summer where you are then you seem in pretty good shape
 
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pahpah-cee

Well-Known Member
Herb & Suds said:
Seems like that would work if your intake air isn't coming from that room
If it is summer where you are then you seem in pretty good shape
Click to expand...
Oh shoot, that’s a good point.

my intake would be in the same room.I might have to get creative and have them separated. It’s a uninsulated garage for my intake.
 
F

figgie

Member
you did not mention air circulation in your grow area and due to your statement,

pahpah-cee said:
When I get on a ladder and get above my LEDS I can feel a good 20 degree difference in air temp.
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You will need some fans to move the air around in there.. with that said, it will raise the overall temps so you might want to consider a different area for your air intake.
 
oldsilvertip55

oldsilvertip55

Well-Known Member
figgie said:
you did not mention air circulation in your grow area and due to your statement,



You will need some fans to move the air around in there.. with that said, it will raise the overall temps so you might want to consider a different area for your air intake.
Click to expand...
carbon filter/ exz. setup in top will help a lot.
 
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pahpah-cee

Well-Known Member
figgie said:
you did not mention air circulation in your grow area and due to your statement,



You will need some fans to move the air around in there.. with that said, it will raise the overall temps so you might want to consider a different area for your air intake.
Click to expand...
That’s true. I don’t have my fans mounted on the wall yet. The fan will prevent the hot spot of air above but definitely increase the ambient temp of the room.

the intake air is coming from the AC.
 
Lenin1917

Lenin1917

Well-Known Member
Rule of thumb for ac sizing requirements.
min addition to the recommended power in BTUs for room size an additional 3000btu per 1000w of power use. Example: room 150sqft requires roughly 5000btu cooling. If you have 1000w lighting, and like 800w in dehumidifier/ fans you’ll want 10-12k btu cooling.

88f is fine with led though especially you’ve got co2 going too.
 
MidnightSun72

MidnightSun72

Well-Known Member
Moving the driver out will save you around 150BTU. Even a cheap window AC is like 5000BTU. Which should be just enough for that grow. An 8000-10000 btu would be slightly better.
 
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pahpah-cee

Well-Known Member
Lenin1917 said:
Rule of thumb for ac sizing requirements.
min addition to the recommended power in BTUs for room size an additional 3000btu per 1000w of power use. Example: room 150sqft requires roughly 5000btu cooling. If you have 1000w lighting, and like 800w in dehumidifier/ fans you’ll want 10-12k btu cooling.

88f is fine with led though especially you’ve got co2 going too.
Click to expand...
I’m at 250sqft with about 900w of power being drawn for the LEDs. The ac is 11k btu but it’s a portable unit and I’m probably working it harder with some restrictions to the air flow.
 
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pahpah-cee

Well-Known Member
MidnightSun72 said:
Moving the driver out will save you around 150BTU. Even a cheap window AC is like 5000BTU. Which should be just enough for that grow. An 8000-10000 btu would be slightly better.
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That’s it?! Only 150btu difference? So if I remove both drivers I’m only dropping the heat 300btu. That’s a lot of work for a small difference.
 
Lenin1917

Lenin1917

Well-Known Member
You accounting for your fans, and dehumidifier too? Portable ac’s lose like 20% of their cooling capacity because of how they vent. Not knocking em just something you should take into account when doing your math. In a sealed room ain’t much you can do besides increase the ac.

You can get kick ass growth with just proper air exchange though and a whole lot less of a headache. Especially if your ac is dual hose, that means it’s a fresh air intake and atmospheric c02 is like 414ppm. Pair that with properly sized exhaust something like a 8 10 inch in-line fan ducted out and you’ll be fucking golden
 
Lenin1917

Lenin1917

Well-Known Member
That heat above the lights is also not really something to worry about if it’s not raising canopy temps. Heat rises and that big aluminum heatsink on your light does a good job helping direct it upwards. Run everything for a full day see if the temp under your lights gets higher and if you gotta do anything from there you’ll know.
 
MidnightSun72

MidnightSun72

Well-Known Member
pahpah-cee said:
That’s it?! Only 150btu difference? So if I remove both drivers I’m only dropping the heat 300btu. That’s a lot of work for a small difference.
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Drivers are usually around 88% to 95% efficient. The more efficient the driver the less heat you save by moving the driver out.

so let's say a 600w driver is 92% efficient. Therefore it will waste 600X 0.08= 48w or 48x3.41 = 163BTU
 
calvin.m16

calvin.m16

Well-Known Member
Your temps are high. I try keeping things 80 lights on 70 lights off. 50% RH veg & bloom basically all the way through. I maintain a VPD of around 1.4-1.5 with LST being considered.
 
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