"RichardS" noaccess@invalid wrote in message
...
"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.

They don't. They are clearly there. Look above, you wrote it..."per square
metre", make that per square foot.



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