Originally posted by Robtard
Thought of a better idea while driving (though I’m sure this can be found elsewhere) using a smaller grid and secondary irrigation grid as evaporation is a great way to remove heat.Create a smaller air grid as described above (run your entrance and exiting piping to the surface point), cover it with about 12-18 inches of dirt and then create and place on top of it another closed grid with small holes drilled throughout the piping and run a capped outlet to the surface where you can open it up, stick in a garden hose for 15-20 mins to run water down and drip-moisten the ground above and around your air cooling grid. This should make your cooling of the air two to three times more efficient.
Can you link me to where you got that diagram