I remember Kai posting these results years ago. Couple of things: Depending on your MT you could have a stuck run off if the temp drops too low. Now, granted, this is on a 20 bbl mash, but if my sparge gets down to the mid to high 130s I end up having laiutering nightmares.
Also, you still need tpo bring the wort temp back up so I'm not sure you are saving that much energy or time by cool sparging.
Still, neat experiment.