Christophe wrote: I have an uncertainty on the fact that the radiation is absorbed (if too much CO2) ... in input and that thus largely compensates the greenhouse effect ... thus + CO2 = colder jar since the radiation thought would be ...!
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Ah, there, these youngsters! Brief reminder of the concept of greenhouse effect:
1) energy arrives on earth, mainly in the form of light energy in the "visible and near spectrum" - the rest has been absorbed by the atmosphere or reflected ... At ground level, you have like " arrival "the solar spectrum + UV ... basically ..
2) this energy warms the substrates: soil, plants, low layers of the atmosphere ...
3) these substrates emit energy in the form of very infra-red radiations (those which are seen on the thermal cameras)
4) these radiations are trapped by the protective layer (atmosphere, glass of the greenhouse) which absorbs them / returns towards the interior ...
In first rough approximation.
Because there is everything at the same time: reflection, transmission, absorption (depending on the color of the materials), in both directions. But in variable proportions depending on the wavelengths and the media crossed (glass, plastic, greenhouse gases, etc.). The balance sheet of these exchanges in all directions "leans", in the end, on one side or the other: it leans more towards the earth than from the space, therefore: "greenhouse effect" on earth.
But this concept of greenhouse effect is only an image (allegory) compared to the greenhouse, the physical phenomena are not quite all the same ...
In short, between arrival and departure, it is no longer the same wavelength and therefore no longer the same behavior. But indeed, it works if we consider the earth facing "the infinitude of space" (which is, I would remind you, an energy chasm), and we liken the atmosphere to a film ...
On the scale of your greenhouse, in my opinion, oddly enough, no measurable greenhouse effect other than the heating of materials by the sun! (and fire if you opt for this method of producing CO²). Indeed, the energy will be almost "equally" absorbed on arrival and departure, in my opinion. It is the absorption of radiation, as in a solar collector, which will take over ...
In my opinion.
