A neat heat recovery system for internal combustion engines

This is a neat heat recovery system for internal combustion engines, but would it work on airplanes and would it be worth its weight in RANGE? Could we do without an alernator? That would be good.

Trade-off between alernator weight and exhaust gas turbine weight? Really, I only need a few watts of power in an LSA. Landing lights? Who needs landing lights in an LSA? I usually charge at 1 amp! Twelve watts isn't much power and I carry around this huge alternator to produce it?!