New grow air flow

[Mr Blah]

I have 3 tents 6.5' square, each with 2k stacked in the middle of 4 trees with screens.
I am exchanging the air in each tent 2x min. with 8" 550cfm fan. No intake fan just screens down low.
2 tents will be on at a time (4k) and the last tent is on a flip flop with downstairs room.

The room that the tents are in is 40'x20'=800sq/ft.

Now the question; If I get a Mitsubishi 24K heat pump, will that be enough to take care of 4k plus act as a lung room conditioner. As it blows in and out of each tent?

 

[Phaeton]

I ran a 5K room with 1250 cubic feet and a 2050 cubic foot lung room.
A pair of 2500 CFM intake fans fed a two foot duct, just enough to straighten the air.
The air was aimed carefully, the plants moved but no leaves were shredded.
Less than 4X per minute air exchange left hot and cool spots from swirling air. Getting the air to smoothly go from intake to outlet took more volume, size does matter. Smaller fans poked tunnels of air through the plants instead of through and around.

You may already know all this, you were after tech numbers for a heat pump. I live in Alaska and when its really cold I direct the air across the window glass and leave the window shut. This only works at -35 and colder, otherwise the window is the heat regulator, a sealed air blender mixes outside and inside air and feeds the intake fan.

No machinery needed. I put my nose in 'cause I thought the air exchange number was a bit low for 4K.

 

[Mr Blah]

Thanks [FONT=Arial, Helvetica, sans-serif]Phaeton,
Do you think the 24,000BTU ac will take care of the heat from 4K of lights that will be on in the tent for 12hrs flushing through in and out of the tent?
Also taking care of the lung room?

The other 12hrs will just have 2k worth of lights on.
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[Mr Blah]

5Kbtu pr/1k of light?
That's 20K and 4kBTU left to cool the rest of the room/lung room.
126.75sq/ft worth of grow area taken out of the 800sq/ft room leaves 673.25sq/ft for 4KBTU..Will it do??

 

[MisterBlah]

Yes, you should be okay.:friends:

 

[MisterBlah]

It's a little weird running into someone who used the same username as I do for most of my online presence.

 

[Mr Blah]

It's a little weird running into someone who used the same username as I do for most of my online presence.

WOw! there is no meaning behind mine...

 

[MisterBlah]

WOw! there is no meaning behind mine...

Me neither. It was a rather blah decision at a the time I chose it.

 

[Mr Blah]

Try and help me out for air flow. Does this sound OK?????????
Over each tent there is a 12" 900cfm fan sucking air out and back into the room to be reconditioned.
Also there is an 8" inlet sucking air from the outside into the lung room (kitchen window).
I will also have a 12" fan with a large scrubber sucking air out of the lung room and dumping it outside.

 

[MisterBlah]

Do you have fans on the outlets of the tents? And can you run some flexible ducting on the exhaust over to one of those minisplit indoor units?

 

[Mr Blah]

Do you have fans on the outlets of the tents? And can you run some flexible ducting on the exhaust over to one of those minisplit indoor units?

Ya I should of explained a little more than I did.
I will be having 12" 900cfm fans sucking out hot air from each tent back into the large room to be reconditioned.

There is just one mini split (24,000btu). The head unit is on the inside and the outside air handling part is on the outside of the building.

 

[MisterBlah]

Three 900cfm fans is overkill. More power than is necessary. You should be fine just using a single 900cfm on the exhaust to pull air through all three. You'd just have to splice together three ducts. This will cause each tent to exchange air about once a minute. Which, even then is more than is necessary.

 

[Mr Blah]

Three 900cfm fans is overkill. More power than is necessary. You should be fine just using a single 900cfm on the exhaust to pull air through all three. You'd just have to splice together three ducts. This will cause each tent to exchange air about once a minute. Which, even then is more than is necessary.

No NO No, I want the air exchanged at least 2x min. With that size fan I will get about 2.5x min.
PM wont stand a chance and any other nasty crap floating around.

 

[MisterBlah]

You should really consider MERV13+ filters.