He will change the world if he can get 50-60% efficiency. Photovoltaic cells would be out and parabolic mirrors aimed at a heating elements would take their place - even better, tubes running under asphalt streets all circulating water through JTEC heat exchangers.

A huge unmet need is extraction of heat energy at lower temperature differentials - it could put to use tons of waste energy at industrial plants, your car exhaust, h20 that leaves current steam generators, etc... The JTEC has the potential to make use of all this would-be entropy.