On 09/10/2013 19:17, The Natural Philosopher wrote:
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.

Don't confuse Chapman its hard enough with the very basics.


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.

Commercial greenhouses frequently have fans to prevent stagnation of the
air.


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

No it doesn't.
Glass is poor at transmitting some wavelengths.
Why do you think passive IR detectors don't work through windows?
You did know they don't work through windows?


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

It is as is water.
Whether it has a significant effect is another thing.


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



etc.