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.
There's not much you can do to get useful work out of low temperature differentials. Carnot's theorem (http://en.wikipedia.org/wiki/Carnot_heat_engine#Carnot.27s_t...) says that the maximum efficiency of a heat engine is n = 1 - T_cold / T_hot, where the temperatures are given on the Kelvin scale (i.e. absolute temperatures).
That means between say 20 Celsius and 45 Celsius you will never convert more than 8% of the thermal energy that needs to flow from hot to cold into useful work.
> A huge unmet need is extraction of heat energy at lower temperature differentials
That, of course, would still be a real challenge. I didn't see any specifics, but notice his ceramic membrane was built to withstand 400 C. That's very hot.
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.