Fan advice, its getting hot again

[smokinjoe]

We had this conversation last year didnt we Rad

I cant find the spec for it but ive got a 200mm pulling on my filter. Supposed to be 240lps.

Even with the aircon (15000BTU), with this heatwave, its gone up to 33. I can kinda see why this is happening- as soon as the aircon puts the cool air in the filter pulls it out. I turned the fan down on the filter alittle thinking the cool air may stay in longer but didnt make any diff.

So I thought it'd be better to work on increasing the airflow thru the light reflectors to try to stop it getting it there in the first place. Till I sort this out ive started putting frizen milk bottles in the res

 

Calaman,

 

Do you have a cool tube?

[calaman]

Nah i got these Joe Refectors from Aussiepon. Sealed em up real good.

[Radic]

the cold air must be entering the room at the lowest possible point

is it????

the air con should be hooked up here

not inside the room because the AC machine itself

will add more heat to the room

keep all heat sources out of the room where possible

floor fan is a must dont skimp try and keep the motor out side too

 

that enclosure should be irey

duck it in to the AC

you should be able to lower them to within 60mm of the tips

hang a temp guage from it and check the air temp at 60mil

your plants will love dat

also

you might considerd putting it on a light mover

this will help deal with high grow room temps

do you have Co2 sorted yet

plants can handle a lot more heat when the Co2 is increased

 

irey guidance

[chuffer]

The fan is blowing the right way around? (its often the obvious we overlook).

 

Trying to visualise from your description, are you able to dispense with the first 2, and also the last 2 feet of ducting? Going from 8 down to 4 feet of ducting will make a big difference, as there's a lot of drag in the narrow corrugated pipe. Also as already flagged, bends make a difference, if you must have a corner make it gradual (without increasing length of ducting).

 

Is air able to freely escape from the roof cavity, thats not a place you want pressure to buildup?

 

A photo of the set-up will help us identify any problems.

Edited August 30, 2009 by chuffer

[smokinjoe]

Is it possible you could run one of the ducts for the lights from outside the room and pumping the air into the roof space?

 

Then run another exhaust for air circulation?

[calaman]

I'll try to explian... My grow room is a room inside a room. 2by2.4. Fully sealed floor to ceiling. The man hole into the roof is inside the enclosure, which the ducting from the hoods and the filter runs thru into the roof cavity to the fan and then 2m further on to exhaust over the eaves - no back pressure there and the manhole is sealedwith holes cut for the ducting.

The aircon sits outside the enclosure blowing air in thru a hole about 500mm from the floor. The outlet pipe for the aircon exhausts thru a hole in the floor under the house (I pulled up some floor boards). The inlet side of the duct for the hoods comes from a hole in the floor, thru a hole in the wall of the enclosure to the hoods.

There is 3 fans inside the enclosure mixing the air. One under the aircon to stir it up, one over the top of the plants and one at root level. The carbon filter sits about 2ft below the ceiling.

Ive never figured how to add the co2 Rad. As I said before it just seems it'd get sucked out. I know its heavier than air but with all the fans.... I suppose if I pissed the fans off (as they arent really cooling just mixing) and added the co2 it'd have to get full before the filter started pulling it out right?

Ive been keeping the res cool with frozen bottles but i noticed yesterday they are starting to show heat damage now...

I'm going to buy a centrifugal this week to put in the beginning of the light run. I was thinking of getting ther can fan max at 400lps+. Taking the mixflo out all together as it'd be no good in that duct as it'd just be running too slow...

[smokinjoe]

Are you using a portable room air con?

[calaman]

yeah, theyre crap. Spent 600+ on the bugger cause i was wporried wot the neighbours wood think running ac 24hrs. Ive decided to piss it off and put in a big window model and stuff the neighbours. I figure a 15K BTU window model will make it like the artic in there if need be

[Radic]

yes increase the air exchange rate

get

faster, bigger and better design

both for the intake and exhust

if the duct taping wont handle it

fix it so it does

go sooooo

 

do try the dry ice trick

its a bit fiddley

but well worth co2 in your system bro

yes a lot does get blown out

so keep it up

its well worth the effort and expence

irey guidance

[psychoresin]

yes co2 increased fan speed and overall dont worry !!!!