> > This is basic physics.  You can't have something that
> > receives radiation
> > well but is poor at emitting it or vice versa.  If you did,
> > you could easily
> > construct a "free energy" machine.
>
>    Too strong statements, as for me. Mother Nature
> constracted >something that receives radiation
> well but is poor at emitting it< : trees, grass.

Actually trees and grass receive and emit equally well.  However, since
their temperature is significantly lower than that of the sun's, they mostly
receive compared to the amount they transmit.  None of this violates the
basic physics I was talking about.  They are also moist with has a whole
other set of effects on their temperature, none of which are relevant here.

>    Why "free energy" machines - rather "radiation energy"
> machines. In case of trees and grass - "sun radiation
> energy" machines.

Because the existance of these machines doesn't disprove the existance of
things that are good receivers but poor emitters (or the other way around).
They are converting incoming radiation into other forms of energy.

I thought it was obvious how you could make a "free energy" machine with
objects that differ in their reception/transmission.  I further thought
everyone would agree that such a free energy machine can't exist, thereby
proving that objects with different reception/transmission characteristics
can't exist.  Apparently I was wrong.

Suppose object A radiated better than it received, and object B received
better than it radiated.  Now suppose I surround these objects with perfect
reflectors so that they are both "seeing" each other.  Both objects start
out at the same temperature.  After a while, A will radiate more onto B than
B will radiate onto A, thereby lowering the temperature of A and raising the
temperature of B.  I could now use this temperature difference to extract
work, getting energy out of the system without having put any in.
Furthermore, this process could go on indefinitely.  That means power is
produced by the system without anything being used up or any power added.
Let's hope at least that you think that is a violation of the basic laws of
physics, else I'm wasting my time and invite you to go patent a perpetual
motion machine.

>    Human made things are ones, based on energy saving
> films, transparent to main sun radiation, while reflecting
> infrared. This films are often built in windows. This helps
> room to be more warm at winter times.

These things exist, but don't disprove what I was saying because the sun and
the room aren't at the same temperature.  All the coating does is alter the
absoption/radiation effeciency spectrum, it does not allow more absorption
than radiation at a specific wavelength.


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