Dry Ice, Cold Coil, Pump, Heat exchanger, Box Fan.

I have a sealed room about 5'x5'x7'
250CMH
135w Blackstar 240 LED
Temp is around 78-82 door open
84-88 door closed
I plan to add another light so i am looking into a small DIY way to cool the air.

Id Like to be able to construct this drawing.
omeadeAC.jpg
Does anyone see a reason this wouldn't work?
Realistically i am looking for a 4-5 degree drop in the temp of the air coming out of the fan.
I would consider that a success. DOOR SHUT temp that is.
I figure the dry ice will get the copper coils super cold and running water from the bottom
will in turn make the heat ex changer decently cool, in theory, producing cooler air.

Is there a way i can eliminate the res of water? have a sealed system with DryIce just packed in and around those copper coils. plus elsewhere...
 
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