grow room temp help

TheRuiner

TheRuiner

Well-Known Member
The BTU's of the AC are what would indicate the cooling power it has, not really the size, it may be waist high but if it's only 5,000 btu's it would have a hard time cooling a room with all those 600 watt bulbs in it. I have a 8,000 btu ac vented into a 3x3x6 tent with a single 400 watt light in it that I have to keep blowing 72 degree air every second the lights are on to keep the temps at around 81 at about 9-12 inches under the light if that helps any. (though my temps outside the tent are 90ish) That AC looks like it might be about 5,000 btu's maybe 8,000. I bet it's not over 10,000. You said you had two of those? I would think a single 12,000btu ac running when the lights are on would help cool it sufficiently. 7,200 watts is a lot of heat though homes. I'd be anxious to see what Purps has to say about this, he is more qualified to help that I, but even with two ac's I would think you'd be able to get the temps down to 80-85ish. Work with me here, but are you sure they are ac's and not dehumidifiers? Maybe that's a dumb question to you, but I'm just trying to help, good luck!
 
scooby83

scooby83

Well-Known Member
TheRuiner said:
The BTU's of the AC are what would indicate the cooling power it has, not really the size, it may be waist high but if it's only 5,000 btu's it would have a hard time cooling a room with all those 600 watt bulbs in it. I have a 8,000 btu ac vented into a 3x3x6 tent with a single 400 watt light in it that I have to keep blowing 72 degree air every second the lights are on to keep the temps at around 81 at about 9-12 inches under the light if that helps any. (though my temps outside the tent are 90ish) That AC looks like it might be about 5,000 btu's maybe 8,000. I bet it's not over 10,000. You said you had two of those? I would think a single 12,000btu ac running when the lights are on would help cool it sufficiently. 7,200 watts is a lot of heat though homes. I'd be anxious to see what Purps has to say about this, he is more qualified to help that I, but even with two ac's I would think you'd be able to get the temps down to 80-85ish. Work with me here, but are you sure they are ac's and not dehumidifiers? Maybe that's a dumb question to you, but I'm just trying to help, good luck!
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how do i find the btu out and ye they are both air cons but they do have a dehumidifier as well they have 3 settings cool,dry and just fan
 
purplehazin

purplehazin

Well-Known Member
Alrighty, glad we have some pictures to work with. The BTU rating should be on a manufacturers tag somewhere on the unit (or instruction manual). I did some research and it looks like the Delta Portable AC's minimum BTU model is 10,000. That should be plenty of cooling power for those cooltubes. Im still quite confused as to why your temps are that high even with all those fans. Only thing I can think of is to run your AC as cold as it will go inside that closet where the cooltubes are sucking from. You should also have some way for the cold air to get into the grow room, but that's not as important as cooling down the lights.

You can just cut some holes in the closet for the grow room and use a negative pressure to draw the cold air into the grow room; that's easiest.

So the next step is to report to us the temp of the closet where the air con is, the temp of the grow room after the lights have been on 12 hours, and to fix your oscillating fans so they blow upward.
 
scooby83

scooby83

Well-Known Member
purplehazin said:
Alrighty, glad we have some pictures to work with. The BTU rating should be on a manufacturers tag somewhere on the unit (or instruction manual). I did some research and it looks like the Delta Portable AC's minimum BTU model is 10,000. That should be plenty of cooling power for those cooltubes. Im still quite confused as to why your temps are that high even with all those fans. Only thing I can think of is to run your AC as cold as it will go inside that closet where the cooltubes are sucking from. You should also have some way for the cold air to get into the grow room, but that's not as important as cooling down the lights.

You can just cut some holes in the closet for the grow room and use a negative pressure to draw the cold air into the grow room; that's easiest.

So the next step is to report to us the temp of the closet where the air con is, the temp of the grow room after the lights have been on 12 hours, and to fix your oscillating fans so they blow upward.
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hi i ran the delta A/C in the closet at its lowest setting which was 17 degrees C ans just ran 9 lights and placed all my fans on the floor blowing towards the extractor fan i didnt notice a difference but then i realized my extractor fan wasnt working but before i had chance to sort it my timer box got fryed must of been pulling to much current threw it which trip my main box gonna sort it out 2morrow

but i have been toying with the idea of sectioning part of my loft space off and have my air intake at one end and my extractor at the other and putting an A/C in there so its like a closed curcuit

do you think this would be ok
 
scooby83

scooby83

Well-Known Member
  • Exhaust hose venting system
  • Cooling capacity 9000 BTU
  • Cooling area 12-20 sq m
  • Dehumidifier rate 1.7 litres per hour
  • Power output 9000 BTU (approx. 2600W)
  • Air delivery rate 480 cu metres p/hour
  • Energy classification B
  • Remote control
  • LED temperature display
  • dB level 53/52/51
  • Refrigerant R407C
  • Power consumption 1300W
just found this info about my A/C
IF IT HELPS
 
scooby83

scooby83

Well-Known Member
Duracraft 8000BTU Air Conditioner
Temperature Range: 18-32 Degrees
8,000 btu/hr Cooling Capacity
Enjoy Clean, more purified air around the home or in the office .
Multi-Directional, Large Air Outlet and a Power Rotary Compressor.
Cooling Performance of 2.3kw.
955 Watts
Power Rotary Compressor
CFC-Free Refrigerant
Wheels on base for easy mobility
W46 x H76 x D33cm
AND THIS IS THE INFO OF MY SECOND A/C
 
purplehazin

purplehazin

Well-Known Member
scooby83 said:
hi i ran the delta A/C in the closet at its lowest setting which was 17 degrees C ans just ran 9 lights and placed all my fans on the floor blowing towards the extractor fan i didnt notice a difference but then i realized my extractor fan wasnt working but before i had chance to sort it my timer box got fryed must of been pulling to much current threw it which trip my main box gonna sort it out 2morrow

but i have been toying with the idea of sectioning part of my loft space off and have my air intake at one end and my extractor at the other and putting an A/C in there so its like a closed curcuit

do you think this would be ok
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Ouch bummer about your electrical. Yeah I like that closed circuit idea; give it a try. You might not want to hear it but using half the lights might be your best bet to lower temp (and power consumption)
 
scooby83

scooby83

Well-Known Member
purplehazin said:
Ouch bummer about your electrical. Yeah I like that closed circuit idea; give it a try. You might not want to hear it but using half the lights might be your best bet to lower temp (and power consumption)
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but aint that gonna affect my overall yeild though cause im gonna have 24 plants in there
 
purplehazin

purplehazin

Well-Known Member
Yes it would affect yield, but If thats the only way to control heat thats what your going to have to do. Its better to run half the power to have healthy plants, than run full power and have plants in hot temperature which lead to smaller airier buds anyway.

One thing you might try is switching your cooltube fans around. So instead of sucking the air through them, try pushing the air from the closet over the lights. It's usually not as efficient this way, but if its not too much trouble lets see if that helps at all...
 
scooby83

scooby83

Well-Known Member
purplehazin said:
Yes it would affect yield, but If thats the only way to control heat thats what your going to have to do. Its better to run half the power to have healthy plants, than run full power and have plants in hot temperature which lead to smaller airier buds anyway.

One thing you might try is switching your cooltube fans around. So instead of sucking the air through them, try pushing the air from the closet over the lights. It's usually not as efficient this way, but if its not too much trouble lets see if that helps at all...
Click to expand...
sorted my electrics out and gonna do some playing around and see what works best think im gonna drop it down to 8 lights and put both the A/C in the loft space and run a re-circulated system gonna tryand keep the air in the loft space below 20 degrees C and try pulling air from a seprate part of the loft and in to the closet and run a seprate fan in the closet to pull the warm air out and to another area
 
TheRuiner

TheRuiner

Well-Known Member
Man I honestly agree with Purps here, 24 plants under 7200 watts of light is overkill. I'll agree with you any day that the best type of kill is overkill, I'm guilty of it myself when money permits, but your shooting yourself in the foot with all the heat. There is a calculator that tells you the best amount of light to use for a given space, let me see if I can find it... http://www.sweetleaf.co.uk/lightarea.php

See what that tells you is the best and still go over that if you want and I bet your still running about 1000 + LESS watts.
your passing the point of diminishing returns with your wattage.
You'll have to have chillers to run that many watts if a 9,000 and a 8,000 btu ac aren't doing the trick.... something seems strange though, I would also think you could get things cooler than you are. How hot is the air your pulling into the lights/grow room? ie. is it hot as hell outside where you are?
 
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