A greenhouse can use many different techniques for regulating and/or storing heat. These do not illustrate the greenhouse principle. The principle is simple: let shortwave radiant energy in and trap the longwave radiation on its way out.This is how a greenhouse really works:
There is a popular misconception that the greenhouse effect is misnamed, suggesting that the trapping of heat by CO2 in the atmosphere is fundamentally different than the use of glass in a greenhouse. The principle is the same, although the mechanism is different. In a greenhouse the glass reflects the IR radiation back into the greenhouse ie. the IR radiation is not absorbed and reradiated by the glass. With CO2 the IR radiation emitted by the surface of the earth is absorbed by the CO2, so the temperature of the CO2 increases. The CO2 then emits IR radiation - half of it back toward the earth.