"The Natural Philosopher" wrote in message
...
Franz Heymann wrote:


So with a large area of Thermolux you might get to 200% more easily than
with other panels?
Please, please understand that there is no such concept as "efficiency
per
square foot" in either engineering or in physics. Efficiency is usually
simply the ratio between the output power and the input power of a
system.



Actually that is not totally so. Efficency is a term that can be applied
to more things than power.

For example, one could define the efficiency of a roof in terms of the
amount of water that runs off versus the total amount that falls on it.


One can define an efficient business as one that has the highest sales
value, or margin value, per employee.

snip

quite.

but Efficiency _per square foot_????

if

efficiency = power of panel out per square metre / power put into panel per
square metre

then the area terms disappear.



--
Richard Sampson

email me at
richard at olifant d-ot co do-t uk