pull or push across cool tube
- Thread starter aktopjian
- Start date
Jtoth3ustin
Well-Known Member
its better to pull. just flip around your exhuast fan or w/e your using
BigBudBalls
Well-Known Member
I was just thinking about this today. I'm thinking push.
If you push, the pressure in the cooltube will go up. More air molecules to absorb heat.
If pull, its at lower pressure and the fewer air molecules.
Just thinking out loud.
If you push, the pressure in the cooltube will go up. More air molecules to absorb heat.
If pull, its at lower pressure and the fewer air molecules.
Just thinking out loud.
NewGrowth
Well-Known Member
Don't have too the point is to exhaust hot air not push cold air across a hot bulb.
aktopjian
Active Member
well i tried booth since i asked. when i push the air across the tub i can keep my hand on it and not have to move it because of the heat. when i pull the air cant keep my hand on the tube. the thermometer in the room pretty much stays the same in my setup either way. i have a exhaust and a intake fan running in the room.
Londoner
Well-Known Member
iv run my cooltube setup for several years and have experimented with the configuration quite alot, ive found it makes no difference sucking or blowing air thru the tube, on paper its better to suck air away from lamp, but iv found this makes no difference, for the ideal cooltube setup you need two exhaust fans, one (just to cool the lamp) to suck or blow air thru the tube from either outside or another room thru the cooltube and straight out into another room then another fan to exhaust yr growroom air and keep fresh air entering, this setup is ideal if u are running Co2 enrichment coz u can slow or shut down the growroom exhaust periodically while yr Co2 is doin its thing, and the other fan is still cooling yr tube preventing heat build up. I have my 5" exhaust fan mounted directly to the c/filter then a short length of ducting down to my cooltube with a 600w hps then a short length of insulated ducting (to prevent the hot ducting heating up my room) out to another room, so my one fan is doing 2jobs, cooling my lamp and exhausting filtered air from my room, people have told me this wouldnt work, but the proof is in the pudding, my temps average 26degrees c, even on hotter days, with shitloads of fresh air stil being drawn i from the passive intakes in my tent! i dont like the idea of sucking air thru my fan directly from the cooltube as the air coming out the cooltube is quite hot and im pretty sure it would shorten the life of my fan?? but in short imho suck or blow, it makes no difference
Londoner
Well-Known Member
exactly! This and the amount of turns and bends in yr ducting is more crucial to the efficiency of yr cooltube setup, not whether u push or pull air thru it.
Londoner
Well-Known Member
the volume of air that is sucked into any given fan will be the same as the volume of air being blown out, every action has an equal and opposite reaction?? If not what happens to the air volume/pressure difference inside the fan? The type of inline fans we use, rvk, ruck, canfans or whatever, work the same sucking or blowing either way around. And i always thought that we didnt use household extractors because; 1. They simply arent up to the job, they cannot move sufficient enough volumes of air needed to keep a room lit with h.i.ds cool enough. And 2. They arent made to run 24hours a day 7days a week 365 days a year, most household bathroom kitchen and other extractors are usually intended to be wired up to thermostats, humidistats or light switches so they only operate for a fraction of each day, i work in the building trade and have changed many failed extractors, even the most expensive and top brand extractors have a habit of failing, they'd fail very quicky under the constant extraction demands of a hot throbbing growroom. My rvk has been running 365days for nearly 5years now, u wouldnt get that much life out of a household fan.
Londoner
Well-Known Member
thanx mate, its minimal heat really, its a fairly cool running in comparison to my previous ballast, because its mounted quite close to my cf and fan the heat is drawn away by the fan, i could probably do with it being out of the tent on really hot days but my budbox just fits into the cupboard its in and theres nowhere else except outside the cupboard for it to go and i cant have it outside for stealth reasons, i like to shut the cupboard door and see nothing!