Up a ladder this afternoon, hanging insulation on the new barn when a couple of random brain cells fired up....
If PV arrays capture energy from the Sun which would otherwise be re-radiated back to the sky, from a global warming POV have we actually improved matters? Any electrical energy produced will still mostly end up as heat in the atmosphere.
The other thought relates to the American propellor trolley discussed back in February. ISTR the proponents insisting that testing the device on a conveyor is the same as testing on a surface with real wind. Umm. Surely the system frictional losses will be supplied by the conveyor motor and hence ignored in the calculations?
regards