On 09/10/13 18:11, dennis@home wrote:

What do you think the glass does in a greenhouse if not stopping the IR
radiation from being radiated and hence making the inside warmer than
the outside. Its just as well that it does or passive solar heating
would be a waste of time.


A lot more than that actually dennis.

Its effects on convection are massive. And in genearal convection
accounts for around 80% of heat lost from a hot object in air.

A lot of te other 20% ois conducation, and that increases massively in
movng air.

So what a greenhouse does, is trap an insulating blanket of STILL air,
mostly. It can't rise and the wind dont get in.

It does sod all for radiation. That goes through glass easily.

Now until carbon dioxide puts a wall and a roof on the atmosphere, it is
not a 'greenhouse' gas.

So long as the dominant energy loss is not 'nightime ground radiation
direct into space' it doesnt have a huge amount to do.



etc.


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