> Hmmm -  small but steady temperature differential twixt down-there and
> surface may allow power generation.
>=20
> Suitable surface hot-plate would have no trouble being >> 50C  on most
> summer days.
> An evacuated tube water heater tube would easily produce steam.
> Cool side is not vastly better than a decent air blown shaded heatsink, b=
ut
> lots of cool source air can't hurt.
> Carnot 70C/20C say =3D (70-20)/373 =3D 13.4% So probably 3-5% ish realisa=
ble
> with several technologies.

So you could probably get enough energy to run a Stirling engine ?


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