Ken
If you want to estimate the albedo with photography you need to include
grey scales printed on top quality white paper in various parts of the
picture. I can post you some.
It would be better to use an incident-light photographic exposure metre
right way up and upside down.
A forced guess is 0.8.
Stephen
Emeritus Professor of Engineering Design
Institute for Energy Systems
School of Engineering
Mayfield Road
University of Edinburgh EH9 3JL
Scotland
Tel +44 131 650 5704
Mobile 07795 203 195
www.see.ed.ac.uk/~shs
On 03/10/2011 02:51, Ken Caldeira wrote:
Folks,
I happen to own a white roof. It covers part of my house.
It was installed with the intention of keeping our house cooler
["not-geoengineering"] and not with the intention of keeping our
planet cooler ["geoengineering].
In any, case I went up there to clear the leaves out of the
drainpipes. While I was up there, I took a few photos with my iPhone
(attached).
Anybody want to guess what the albedo of this "white roof" is? It has
Energy-Star approval. (http://www.duro-last.com/)
/Duro-Last is proud to be a charter partner in the EPA's ENERGY STAR®
<http://www.energystar.gov/> Roof Products Program. Duro-Last is a
leader in cool roofing solutions
<http://www.duro-last.com/cool-roof.asp>, and our Cool Zone®
<http://www.duro-last.com/coolzone/> brand addresses the growing
nationwide interest in *sustainable roofing systems*./
Best,
Ken
_______________
Ken Caldeira
Carnegie Institution Dept of Global Ecology
260 Panama Street, Stanford, CA 94305 USA
+1 650 704 7212 [email protected]
<mailto:[email protected]>
http://dge.stanford.edu/labs/caldeiralab @kencaldeira
/See our /*YouTube*:
Regional responses to solar-radiation management: Dr. Katharine L.
Ricke <http://www.youtube.com/watch?v=SaV2JawS4cw>
Biofuels, food prices, and the poor: Roz Naylor speaks to Near Zero
<http://www.youtube.com/watch?v=VCrsIjCci4c>
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