How hot can a cooltube get

[lysol]

I'm looking for a quantitative figure on how hot a cooltube can get without doing damage, since it voids your "warranty" to run it too hot. I have centrigual fans on the way but for now running loud axials turned way down. is 200F hot? I can keep it around 120F but its a bit loud for me, my plants are like 4" away and 80F but obviously temps wont matter if 35lb of glass were to crush the plants, haha

 

[Dr Dog]

hmm

well the idea of cool tubes is that it stays cool, and the ideal way to draw cool air is from outside the room

I have a 24 inch cool tube that I would run 2 600's in, but I also had a 4 inch vortex to pull cold air from an adjacent room, and I had to add supplemental heat last winter.

I would say you are playing with fire dude, I would not be as worried about teh cool tube as I would the lamp burning out.

If you want to use the pc type fans, then go ahead, just draw your cool from elsewhere, like outside your room, basements and crawlspaces are great

 

[lysol]

I am using 2 8" duct boosters inline, I have 2 6" centrifugal blowers on the way as stated, nothing I can do to speed that up, current duct boosters can only run several feet of duct, again looking for something quantitative. Lamp is already as shot as it can get, new lamps are w/ the same order as the fans on the way, 600w lamps run at 400F with regular hoods in my part of the world, even with AC. Just looking for a quantitative figure the glass is rated for, it wouldn't make sense to me for glass to crack from heat but I guess it says on the thing that it can, but fails to define "Adequate ventilation".

Also you live in Canada and I live in the south US in a part where snow has prolly never hit the ground lol, bit of a diff there

PS > I lied and my cooltube actually runs closer to <= 150 for most of the day, I am just concerned about if I left and something went wrong. I have a high temp shutdown relay on the way too ( same order )

With centrifugal blowers I will most likely be able to run the ducting to draw cooler air

 

[Dr Dog]

It would be a tad colder here, but temps do hit 90f in teh summer with an insane amount of humidity. Yes in Canada, it does happen.

I will look around for you to find the tipping point for that glass, but I would assume it is probably pyrex or teh like which has a high degree breaking point

 

[Dr Dog]

well Pyrex is rated to 1500f

And regular glass itself is at about 900f, so I think you will be fine

 

[EllieGrows]

I wouldn't worry about that low of temps weakening your glass.

 

[lysol]

Word, ok thanks all... no point in having my fan screaming then as long as plant temps are fine.

 

[lysol]

Yo I built a tarp curtain boxing in my 2 x 3ft grow space ( 9ft tall or so ), there is an ac vent in the closed off area and I got ambient temps at 69, the cooltube still runs like 160F with an IR gun and if I put the back of my hand I cant hold it there more than 1-2 seconds, my plants are 6" away and 75F so all is good, I'm just wondering to those who say they can put their hand, how many CFM are you pushing and what are your ambient temps and what are the temps of the air you are cooling with? The air I am cooling with is like 74. Oh and I also have a fan blowing across the outside of the tube, why is it still so hot? Im pushing 600w

Hmm just forgot I havent changed the bulb in like 3 grows, new one is supposadly on the way, do you think that could be it?

 

[Maj.PotHead]

i can touch my cooltube w/400w hps in it n/p its warm but not hot n burn
the 400w mh in air cooled hood is much cooler

both 400's are exhausted with this http://www.icmag.com/ic/showthread.php?t=29341 place the stanely blower fan outside of flower chamber

 

[goofy81]

Sorry to bring this topic back up. But I am running 150mm cooltubes (6inch) with 600W HPS lights. No matter how cool or how much air is getting sucked up the cooltube, the cooltube is very hot to touch right next to the light and heat is still felt. Is this normal?
How do I know when i'm not running enough CFM? The bottom of my cooltube feels very cool! its just that big thats next to the light thats hot.
thanks

 

[Dr Dog]

where is your intake coming from

The cooltube will work much better with cool or cold air being sucked through it

 

[DiscoBiscuit]

Are you talking about the ceramic bulb socket? It's got 600w of juice running through it. It's supposed to get hot.

 

[goofy81]

Hey Dr Dog, yes with cool air its still hot to touch. I know its cool air because i can feel it exhausting from the top.

Maybe i had too high expectations.

 

[lysol]

I found all my problems were solved when I started exhausting the air outside. Of course for this I needed a carbon filter and more complicated duct work, but the cool tube is now actually cool

 

[Dr Dog]

yeah you need to make a cool tube a closed system Goofy

meaning that you need to have both the intake and exhaust a separate duct run.

If you are exhausting into your room, you are just dumping hot air in there