To get energy from the sun for the solar chimney power plant is the same
effect used like it is used for hothouses. All bodies absorbs the insolation at least
partly. The absorbed insolation of short wave length is going to be changed from the
bodies into radiations of long wave length, so to be changed into warmth. And in
general transparent material like glas or foil, the typical material for hothouses, has
also the ability of reflecting the radiations of long wave length. So such material is
impervious for long wave radiations (‘elamination of radiation casualties’), which
gives the material a good efficiency. Beside that there is the advantage of the
mentioned kind of material that it also absorbs diffuse light. That means that the solar
chimney power plant also operates with overcast sky, what is importand to tropical
regions in addition to the regions mentioned in the introduction.