It sounds great but at 100 watts per square meter it would require a great deal of area.
If, and that is a big if, it really is 100W/M, then that is actually quite good.
My math might be off, but for example my house has about a 1400 square foot roof (Larger actually, but from a top view, its about 1400 sq ft). That translates roughly into about 130 square meters. That would mean that a roof of this material could radiate away about 13,000 watts. According to this site (http://www.simetric.co.uk/si_tz.htm), that works out to about 3.7 tons of refrigeration. My house only needs 2.5.
For that reason, and others of practicality, actual system inefficiencies, and so on, I will file this, for now, in the "Too Good To Be True" file.
Actually, that's about 9w/sf or 31 btu/sf, or 390 sf/ton, which is a pretty typical AC load. Course that in turn makes me think the 100w/m^2 is bunk.