In my travels, I have consistently been asked by contractors, reps, distributors and owners how to estimate energy and peak demand savings for flat roofs with non-black surfaces.
Here is a link to one of the best - http://www.ornl.gov/sci/roofs%2Bwalls/facts/CoolCalcPeak.htm
It was Developed by the U.S. Department of Energy's Oak Ridge National Laboratory (Version 2.0) and this version of the calculator is for large facilities that purchase electricity with a demand charge based on peak monthly load. If your customer has a small or medium-sized facility that purchases electricity without a demand charge, run the CoolCalcEnergy version to estimate the savings in energy charges from using solar radiation control.
Both are very easy to use and take into account regional and local vagaries.
FYI and thanks.
