elementary thermodynamic question 3

[2brains]

Could someone simply confirm my reasoning that to use a working fluid such kerosene rather than water in a engine like a steam turbine would be a lot more efficient since the latent heat of evaporation of kerosene is less than 1/2 that of water? I would need to travel 45mi to the nearest Univ. to ask an engineering professor this or to even look this up in a thermodynamics text since most public libraries wouldn't have such books. And, if I did look it up in a book I might have to read two chapters and still not get an answer to the specific question.

 

[25362]

Roof-mounted close-coupled thermosiphon solar water heaters are also considered an indirect saving on the electricity bill.