Thanks for entertaining me, and my ideas here! If we consider compressing air to 100psi, and maintaining a tank at ground temp (47F here), then expanding the air from 100psig to 0psig, over a radiator with ethylene glycol, we can move the heat from the radiator out to the environment.
I have to do the calculations for the amount of air needed to carry the heat off. There may be a prohibitive amount of air needed.
The main reason I am interested in this, is because as the solar panel array gets bigger and bigger, I find I have trouble using the excess power.
DF