Dear All,
In SRM strategies, high-albedo surfaces are proposed to reduce solar heat gains by reflecting an increased amount of solar energy. At ground level the “cool roofs” and surface albedo change strategies very well described by Alvia Gaskill (a former very important contributor to this group) seemed sometime ago very promising. A very complementary technique to cool the Earth could be a strategy using night sky cooling surfaces that can pump heat away by radiative cooling to the atmosphere and get rid of the heat directly into outer space. The longwave energy is removed directly by transmission through the atmospheric window. When protected from wind, by clear sky and dry weather, heat transfer from ground surface by IR radiation is much faster than air convection, so a net cooling of the ground can occur resulting in well above air temperatures. This can be used to store at night, cold water for the daily use of cooling buildings: http://www.fsec.ucf.edu/en/publications/pdf/fsec-cr-1771-08.pdf (short version), http://www.fsec.ucf.edu/en/Publications/pdf/FSEC-CR-1882-11.pdf (long version) Parker, D. S., Sherwin, J. R., Hermelink, A. H., & Center, F. S. E. (2008). NightCool: A Nocturnal Radiation Cooling Concept. *2008 ACEEE Summer Study on Energy Efficiency in Buildings*, 209-222. Don't you think that large scale development of similar technologies for night time can be quite complementary to the daytime “cool roofs, cool paints, cool coatings, cool pavements, cool roads…” strategies? In the Earth radiation budget diagram showing incoming solar radiation and earth outgoing IR radiation, can this type of heat transfer be assimilated to an increase of the “atmospheric window” pathway? -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
