Which uses more power? A/C to exhaust or A/C Sealed room?

[RubeGoldberg]

The room in question is the one in the thread below.
https://www.icmag.com/ic/showthread.php?t=336905

plus a few identical rooms I plan on building. 8 x 600w

I've got it currently running air exchange with cold air from outside.
however with winter ending, im contemplating some options..


1. switch the shades to air cooled with air coming from outside the building and back outside on a closed duct circuit.

Then run outside intake into the room, with A/C helping out on a thermostat. Room will exhaust through carbon can and out of the building.


2. Same setup as above, but sealed. switching exhaust fan in to a scrubber and bringing in Co2 tanks.




Which of the two setups will realistically use more power? I've only ever used A/C on sealed rooms before, but I like the smell reduction of a negative air pressure room exhausting outside.

 

[Can of Bliss]

Hard to say, but in most situations you'll use less power exhausting and precooling intake air. With this system you wont need to run the A/C on cool days. But when it's very hot out, you might end up using more power.

A sealed room with CO2 could be run a bit hotter, so that will help power use.

 

[RubeGoldberg]

Hard to say, but in most situations you'll use less power exhausting and precooling intake air. With this system you wont need to run the A/C on cool days. But when it's very hot out, you might end up using more power.

A sealed room with CO2 could be run a bit hotter, so that will help power use.

it'll run hotter, but also not have the benefit of exhaust.. so I wonder how much it'll actually tax the air con.

i think i'll probably start with pre-cooling intake and then adjust from there

 

[Floridian]

I've never use A.C. to exhaust but have run a sealed room for years and other than lighting,A.C. is the largest power load,I can't imagine using it to exhaust would come close to using it for temp control.Of course that would depend also on if your fixtures are air cooled or not,I run vertizontals non cooled so keeping a decent ambient temp takes some BTU's

 

[Asslover]

Exhausting AC cooled air will inevitably use more power than simply sealing the room and cooling the air. I use inverter driven minisplits and once set temp has been reached the AC barely runs while maintaining the temps.
I run open hoods and use co2 and go away to Europe for weeks and don't ever have issues...
I use a scrubber in the room and dehumidifiers.

 

[queequeg152]

it makes 0 sense to try and use both ac and exhaust cooling.

just lock out your ac when the outside air is cool enough for exhaust cooling, and lock out your exhaust cooling when the air outside it too warm to cool the room.

idk why you would ever want to AC the incoming air unless you were looking to keep the humidity high or something like that... but if that was your goal you could always just increase the velocity through the evaporator coil.

 

[shishkaboy]

I feel like an idiot