lights that are cooled?? HOW.........

doc111

doc111

Well-Known Member
That 5hit said:
what size bulb do you have
and is the fan just blowing over the bulb or is it pulling air
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It's 1000w and I have an inline fan blowing air over the bulb. The hydro shop said it's better to push air that way you are not pulling warm air into the fan.
 
tip top toker

tip top toker

Well-Known Member
That 5hit said:
so if you had a fan blowing air on the bulb, as well as the fan pulling air from the bulb, would this work twice as good as just one fan pulling
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technically it will work better, not twice as good though. and it'll depend on how your ducting is sorted. you put a sharp bend in your ducting, and your exhaust fan will have a harder time and there will most likely be a pressure drop. so the additional fan at the other end, working in a push pull configuration, will help keeping the pressure ok.

it is generally not necessary unless you've got a monsterous light, or you're trying to keep noise levels down and as such can't justify a big exhaust fan, so you could settle for more and less.
 
L

LiquidLumen

Active Member
jeebuscheebus said:
Air is easier to move than water in terms of volume. That 3000 times volume is some fuzzy math.

In a perfect world, a water cooled system could be awsome. Most folks don't have the time, money or space for liquid.

Enclosed hood with intake and exhaust seperate from the room is key. Move enough air and the heat goes bye bye.
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First, I'm pretty sure the math is correct, if you go along with the assumptions that I stated. If you disagree with it then offer me a better example.

Second, I'm not saying air cooled lights don't work- obviously they do, and you're right about having the intake and exhaust separate from your room.

I'm just saying in terms of cooling abilities water is known to be much more effective than air, and these lights prove it because I have yet to see the air cooled light that remains cool to the touch after hours of operation.
 
think2toke

think2toke

Well-Known Member
Ive seen the liqued cooled. There amazing you can rest your hand on the incloser and its only warm. Real cool stuff...
 
J

jeebuscheebus

Active Member
LiquidLumen said:
First, I'm pretty sure the math is correct, if you go along with the assumptions that I stated. If you disagree with it then offer me a better example.

Second, I'm not saying air cooled lights don't work- obviously they do, and you're right about having the intake and exhaust separate from your room.

I'm just saying in terms of cooling abilities water is known to be much more effective than air, and these lights prove it because I have yet to see the air cooled light that remains cool to the touch after hours of operation.
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I agree with most of what you say.

My one bone is the "3000 times" etc.

Without context it is meaningless. Air is "X" times lighter than water and thusly easier to mover from the room.

HydroFarm hood with venting holes $100
Two computer fans $40
Ducting $15

This setup is one sixth what a liquid setup would run me. Plus less electricity to operate.
 
L

LiquidLumen

Active Member
jeebuscheebus said:
I agree with most of what you say.
Click to expand...
jeebuscheebus said:

My one bone is the "3000 times" etc.

Without context it is meaningless. Air is "X" times lighter than water and thusly easier to mover from the room.

HydroFarm hood with venting holes $100
Two computer fans $40
Ducting $15

This setup is one sixth what a liquid setup would run me. Plus less electricity to operate.
Click to expand...



First of all, we have to agree on the volume difference, but I'm assuming my calculations are correct because I am an engineering student and I've done this type of calculation hundreds of times. If you disagree, explain how it's wrong and correct me.

Ok, so the actual numerical value is:

Liquid has 3235 times the heat capacity of air, given our parameters.

Now you do have a valid point about air being easier to move than water, but let's quantify that difference.

Let's say that our liquid cooled set up uses a 400GPH pump.

400 gallons per hour = 6.67 gallons per minute.

1 gal = 0.13 cubic feet

6.7 gallons * 0.13 cubic feet = 0.87 cubic feet per minute

To determine the equivalent fan size needed to match the heat capacity of that amount of water, let's find out how many cubic feet per minute we need:

3235*0.87 = 2814 Cubic feet per minute.

Good luck finding a couple of PC fans that can produce 2814 CFM for $40....shit you won't even find something that powerful for $400.....

Now can you understand the difficulty in having your cool tube surface stay at 85F? Especially with a 600W
 
TechnoMage

TechnoMage

Well-Known Member
I think it's just a matter of tradeoff's. I can see some situations where liquid cooling would have the advantage but I think for most people the negatives are to big. For me, the reservoir is the deal breaker. I have a fairly stealth setup and just couldn't hide the extra equipment.
 
R

ROBINBANKS

New Member
LiquidLumen said:
That looks nice, what exactly is it? Liquid or air cooled?
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Air cooled fella, one end is seeled, ducting goes over the open end and connects to a small fan, draws the heat so you can get the set up right down on top ot the canopy, tops of plants dont get burt if they touch it, nice eh.
 
That 5hit

That 5hit

Well-Known Member
LiquidLumen said:
First of all, we have to agree on the volume difference, but I'm assuming my calculations are correct because I am an engineering student and I've done this type of calculation hundreds of times. If you disagree, explain how it's wrong and correct me.

Ok, so the actual numerical value is:

Liquid has 3235 times the heat capacity of air, given our parameters.

Now you do have a valid point about air being easier to move than water, but let's quantify that difference.

Let's say that our liquid cooled set up uses a 400GPH pump.

400 gallons per hour = 6.67 gallons per minute.

1 gal = 0.13 cubic feet

6.7 gallons * 0.13 cubic feet = 0.87 cubic feet per minute

To determine the equivalent fan size needed to match the heat capacity of that amount of water, let's find out how many cubic feet per minute we need:

3235*0.87 = 2814 Cubic feet per minute.

Good luck finding a couple of PC fans that can produce 2814 CFM for $40....shit you won't even find something that powerful for $400.....

Now can you understand the difficulty in having your cool tube surface stay at 85F? Especially with a 600W
Click to expand...

WOW.. i would let my wife have a child by you:wall: this guy is a fucken smarty pants:o
 
L

LiquidLumen

Active Member
ROBINBANKS said:
Air cooled fella, one end is seeled, ducting goes over the open end and connects to a small fan, draws the heat so you can get the set up right down on top ot the canopy, tops of plants dont get burt if they touch it, nice eh.
Click to expand...
Yeah, for some reason I don't see that working though- how can one end be sealed with a fan sucking air out of the other end? Where does the air come from?
 
AquafinaOrbit

AquafinaOrbit

Well-Known Member
All those numbers pertaining to water mean nothing though if you are not able to then take the heat its storing and transfer it unto something else. (To a radiator where it is then taken into the air which then itself needs to me moved)
 
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