Has anyone tried cooling & CO2 enrichment with dry ice?


#1

Has anybody tried using dry ice–solid phase CO2 commonly sold from freezers at US grocery stores–for a combination of CO2 enrichment and nutrient solution chilling?

What if you put a chunk of dry ice in an insulated picnic cooler and plumbed an air vent from the cooler to your growth chamber for CO2 enrichment and a heat exchanger coil from the cooler to your nutrient tank? The heat exchanger would probably need to use something other than plain water to avoid freezing.

Here’s an ascii sketch of the arrangement I’m wondering about:


                                        Growth Chamber
                                      +-----------------+
                                      |                 |
                                      |                 |
   Picnic Cooler                      |                 |
 __________________                   |       {*}       | 
/                  \                  |        |/       |
}------------------{                  |       \|        | 
|                 =|====[CO2 pipe]====|=       |/       |
| ###############  |                  |_._._._.|._._._._|
| ### Dry Ice ###  |                  |.................|
| ###############  |                  |.... Nutrients ..|             
| ###############  |                  |.................|
|     [Coil]=======|==[Coolant Pump]==|=====[Coil]......|
 \________________/                    \_______________/


#2

I came across a company developing a product to extract CO2 from the atmosphere and release it into a greenhouse. They have also been working on vertical farming for a genetically modified Duck Weed to remove CO2 from the atmosphere. There appear to be synergies with OpenAg.


It appears people from Cold Spring Harbor Lab are involved.