I get the feeling that Libelle and I were thinking along the same lines, but she obviously wasn't reading me or this article would have been different.

BTW, one term which wasn't mentioned here but probably should have been is "availability".  This is the amount of energy which can be recovered from a system, and it's one of the crucial concepts I took away from my thermo course (which changed the way I saw the world as it did Libelle).

A suggestion. Why don't you or PG or someone do a thermo primer? Libelle did decently, but as you said to analyze this you have to use the Helmholtz free energy and/or exergy concepts.

a thermo primer

I always reckoned that almost everyone would switch off when the equations started.

to analyze this you have to use the Helmholtz free energy and/or exergy concepts.

Exactly. To do this in a way that is accurate is not trivial. I've made a couple of presentations to economists, with a positive reception, but I don't know how much stuck.

but she obviously wasn't reading me

It's "he", btw.

Sorry.  I can't tell the players without a program, even when I'm one of them.

Libelle is a very feminine name, most likely caused by the affix 'elle'. It's the German word for Dragonfly isn't it?

It's the German word for Dragonfly isn't it?

Yes. I used to fly one of these: http://www.planepictures.net/netshow.php?id=222694

Amazing little machines.

One of the original "glass slippers".  Part of the Aptera's parentage, from the looks of it.