Several people have answered since I posted.

I'm an Engineer (thus the 'bert' in my screen name). We learned about the latent heat of vaporization pretty early.

Water spray = cooler air = lower starting air temperature going into the condenser airflow = better thermal efficiency.

I don't know how much water it uses. I just turn the water faucet on a little so it's probably well under 1 gpm possibly in the range of 1 gph.

(Sorry. No pictures. I don't own a digital camera.)