wrote in message
...
On Tue, 13 Jul 2004 21:17:29 +0000 (UTC), "Franz Heymann"
wrote:


"Nick Maclaren" wrote in message
...

[snip]

[On reradiation]
No, what I mean is surface heating. This is the effect by which
the
surface of an object can become much hotter than either the body
of
the object or the air temperature.

Which of the objects under the glass will receive more reradiated
heat
from neighbouring bodies than others?
Are you remembering that the body you have chosen to receive
reradiated heat is itself also reradiating?
Surely as time passes, all the objects in the enclosure will try to
achieve the same temperature?

One point is that glass reflects
long (far) wavelength infrared well,

That is not true. It absorbs infrared radiation.

I thought you might says that :-)

and you didn't mention black body radiation.

Firstly, the glass is not a black body. {:-))
Secondly, reradiation is not reflection.
Thirdly, reradiation is not the only (or even the major?) process by
which the heat is retained in the gteenhouse. Convection is very
important.


[snip]

Franz


Franz

You are having an attack of double signatures again

My apologies.

Franz